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    26 September 2022, Volume 38 Issue 09
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    Study on Prospect of New Foamed Ceramics Prepared by Industrial Solid Waste
    LI Biao, PEI Dejian, HUA Shaoguang
    2022, 38(09):  1. 
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    In order to promote the resource utilization and high-value utilization of bulk industrial solid waste，the comprehensive utilization of bulk industrial solid waste in the field of valuable metals and building materials was reviewed according to the status and characteristics of bulk industrial solid waste. The construction and sintering mechanism of new Si-Ca based ceramic system using industrial solid waste were analyzed. From the current stage of development，in-depth exploration of the feasibility and technical prospects of the research and development of Si-Ca-based foamed ceramic products，and the realization of the coordinated preparation of Si-Ca-based foamed ceramics from bulk industrial solid waste can not only eliminate a series of hidden dangers of solid waste storage，alleviate the environmental protection pressure of enterprises，ensure the sustainable development of mineral resources，but also save the exploitation and consumption of natural resources in the field of foamed ceramics，innovate the preparation process and technology，and help“carbon peak，carbon neutralization”.
    Experimental Study on Preparation of Foam Concrete with High Content and Low Silicon Iron Tailings
    HUANG Wen, LI Yubiao, LI Pengfei, PAN Mengzhen, LIU Shu, CHEN Kun
    2022, 38(09):  5. 
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    In order to solve the problems of large-scale storage, environmental pollution, dam break and other risks, and the difficulty of utilization of iron tailings in Yangjiawan tailings dam of Chengchao Mining Co., Ltd., Wuhan Iron and Steel Resources Group, the low-silicon iron tailings were used as raw materials to prepare lightweight foam concrete by chemical method. The effects of water-to-material ratio, cement dosage, foaming agent dosage and foam stabilizer dosage on the performance of foam concrete were in⁃ vestigated. Under the condition of high dosage of iron tailings of 55%, lightweight foam concrete with density of 600.08 kg/m3 and compressive strength of 1.080 MPa was prepared. It provides a scientific basis for the comprehensive utilization of a large number of low silicon iron tailings in the tailings pond.
    Test of Solidification and Stabilization of Heavy Metal Tailings from a Copper Mine with Solid Waste Based Cementitious Materials
    LIU long, HUA Shaoguang, YANG Xiaojun, LI Shuqin
    2022, 38(09):  9. 
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    In order to realize the solidification and stabilization of heavy metal tailings in copper mine, according to the requirements of harmless disposal of heavy metals in a copper mine tailings in Yunnan, the whole tailings of copper mine were cemented and solidified by using the developed solid wastebased cementitious material. The unconfined compressive strength of the solidified body at each age and the leaching toxicity of heavy metals at 28 d were tested to investigate the cemented filling performance of the cementitious material and the solidification and stabilization performance of heavy metals. The test results show that the compressive strength of solid waste-based cementitious materials is high, which meets the technical requirements of mine filling mining technology. The leaching concentration of 28 d solidified weight metal is lower than the Class IV water limit in GB3838—2002, which can eliminate the hidden danger of heavy metals in tailings to the environment. The solid waste-based cementitious material is mainly composed of industrial solid waste such as slag, steel slag and desulfurization gypsum. It has low cost, high performance and wide application range. It realizes the resource utilization of solid waste and has broad prospects for industrial promotion.
    Effect and Mechanism Analysis of Iron Tailings Powder on Performance of Dry Mortar
    ZHOU Lei, WENG Jinhong, LI Kaiwen, WANG Jinhang, LIU Juanhong
    2022, 38(09):  13. 
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    In order to study the effect of different proportion of iron tailings powder on workability， mechanical property and microscopic mechanism of dry mortar，experiments of iron tailings powder were used as the research object to replace the machine-made sand and cement. The results show that the mechanical property of dry-mixed mortar was decreased with the increase of iron tailings powder when the total amount of powder material and machine-made sand remain the same. When the iron tailings powder was used to replace the machine-made sand with 10%，the performance of M20-mortar was the best and met the requirement of workability and mechanical property. When the replacement rate of iron tailings powder to machine-made sand reaches 30%，the workability and mechanical property of M5-mortar can be met. The incorporation of iron tailings powder can accelerate the hydration of cement，increase the degree of hy⁃ dration，and generate more Ca（OH）2 at early age. The silicon-oxygen break bond and aluminum-oxygen break bond in iron tailings powder can reunite under the action of Ca（OH）2 and form the double-salt minerals with calcium silicate and calcium silico-aluminate. The mortar’s structure was loose when the iron tailings powder was added，so its compressive strength was decreased. Dry-mixed mortar can meet the stan⁃ dard of specification requirement when 10% to 30% mechanical sand and cement were replaced by iron tailings powder.
    Resource Utilization Status of Magnesium Element in Electric Furnace Nickel-Iron Slag
    CHANG Ruirui , ZENG Jinyang, HE Jinyao , PANG Dan , WANG Tian, MA Hongzhou
    2022, 38(09):  18. 
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    In order to reduce the waste of magnesium resources and realize the large-scale utilization of ferronickel slag，aiming at the problem of magnesium resource utilization in ferronickel slag of electric furnace，the process status of magnesium resource utilization in ferronickel slag of electric furnace by three methods of high temperature reduction，leaching and roasting leaching was reviewed. The results show that the reaction temperature can be reduced by vacuum in the high temperature reduction method. The addition of CaO and other additives can effectively improve the reduction rate of magnesium. The use of silicon as a reducing agent is better than other reducing agents. Using the method of leaching and roasting leaching， the reaction can be carried out at a lower temperature，but because the slag carries the leaching solution， there is a problem of limited slag discharge and storage. The study provides a useful reference for the resource utilization of magnesium in ferronickel slag.
    Experimental Study on Iron Resource Recovery and Utilization of a Tailings
    LU Yongsen, GAO Junlei, ZHANG Hao
    2022, 38(09):  21. 
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    In order to improve the recovery and utilization rate of resources，improve the plant and its surrounding environment，and realize the energy saving and emission reduction of the plant，in view of the problems that a certain amount of iron resources in the tailings of the plant are not effectively recycled， and a large number of tailings are piled up to pollute the environment and occupy land，the chemical multielement， phase analysis and low intensity magnetic-high intensity magnetic-shaking table test were carried out. The results show that the total iron grade of the tailings is 11.90%，which has the value of recycling. The iron concentrate 1 with total iron grade of 65.72% and iron recovery rate of 14.92% and the iron concentrate 2 with total iron grade of 59.15% and iron recovery rate of 3.59% are obtained through experiments. The test shows that the process can realize the recovery and utilization of iron resources in the tail⁃ ings.
    Study on Ecological Restoration of Desertified Grassland Mining Wasteland Using Iron Tailings
    XU Qingrong, TAN Hui
    2022, 38(09):  24. 
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    In order to alleviate the impact of topsoil scarcity on ecological restoration in desertifica⁃ tion grassland mining areas and provide guarantee for the stability of fragile grassland ecosystems，topsoil substitute materials and ecological restoration technologies suitable for desertification grassland mining areas were developed. Using iron tailings and local sewage treatment station sludge as raw materials，the indoor pot experiment was carried out after mixing with different ratios. The growth characteristics of vegetation and soil physical and chemical properties under different ratios were studied，and the ratio of topsoil alternative materials and combined vegetation suitable for this area were optimized. The field test results show that it is feasible to use the mixture of iron tailings and sludge as topsoil substitute material. The organic matter content of the mixed topsoil substitute material is 2.42% ~ 15.60%，which meets the requirement of soil fertility organic matter greater than 0.5%，and is conducive to the restoration and growth of veg⁃ etation. The iron tailings and sludge were mixed at a volume ratio of 9∶1，and the surface soil substitution material had the best effect. Planting Elymus dahuricus and Puccinellia tenuiflora，the plant survival rate reached more than 90%. The study can provide a theoretical basis for the rational use of iron tailings as top⁃ soil substitute materials and solid waste.
    Current Situation and Thinking of Regional Geological Survey in Anhui Province
    TANG Minhui, WANG Yafei
    2022, 38(09):  28. 
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    Regional geological survey is one of the important means for human to systematically understand the earth. It is the most basic and leading geological work to conduct comprehensive investigation and research on basic geological conditions in selected areas through the use of multidisciplinary theories and technical methods，and will remain the focus of geological exploration for a long time in the future.On the basis of summarizing the status quo of regional geological survey in Anhui Province，the main problems existing in the work are analyzed.Besides that，the work deployment principals of "innovative guidance，fundamental guarantee，reasonable setting，emphasized highlights，demand oriented，services strengthen，rou⁃ tine mapping，focused key points，central-provincial deployment together"，so as to provide more efficient policy for our future regional geological survey work.
    Geological Characteristics and Prospecting Direction of Refractory Clay Deposit in Mianchi County, Henan Province
    LI Min
    2022, 38(09):  32. 
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    Henan Province is rich in refractory clay mineral resources,and its reserves rank second in China.Refractory clay has a complete variety and good economic value.It is one of the superior minerals in Henan Province.The refractory clay deposit in Mianchi County, Henan Province,is located 10 km north of Mi⁃ anchi County,and is located in the southern margin of North China landmass in tectonic position.By summarizing the ore-forming geological characteristics,the genesis and prospecting direction of the deposit are ana⁃ lyzed.The study results show that:①The deposit occurs in the Upper Carboniferous Benxi Formation of iron and aluminum mudstone formation,belongs to sedimentary deposit type.②The ore minerals are mainly kaolinite and diaspore, and a small amount of pyrite and other minerals.The refractoriness is generally greater than 1 760 ℃.③The orebody is lens-shaped,and its occurrence,shape and distribution are controlled by the geomorphology of the sedimentary disjoint surface.It often coexists with bauxite and distributes in the upper part of bauxite.The zone with karst funnel development is conducive to the formation of high-quality clay ore.
    Study on the Orogenic Belt in Heilongjiang Province: Molasses of Oceanic Crust Subduction Orogeny and Continental Crust Collision Orogeny in Recognizion
    ZHANG Tie’an, LIU Yuqi, GAO Hongyan, DU Bingying, LIU Yuwei, ZHAO Yusheng, WANG Xunan
    2022, 38(09):  36. 
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    In the study of orogenic belts，oceanic crust subduction orogenic process and continental crust collision orogenic time are important contents in the study of orogenic belts around the world. Molasse is one of the key factors to study oceanic crust subduction orogeny and continental crust collision orogeny in orogenic belt.Through the in-depth study of the orogenic belt in Heilongjiang Province，it is believed that the theoretical significance of the study of Motolite is to reconstruct the mountain history from the perspec⁃ tive of the orogenic belt，that is，Motolite can not only limit the closing time of the ocean basin at the edge of the block，but also can invert the recessional subduction orogenic stage of the ocean crust in the orogenic belt (the stage of the ocean-land conversion).The analysis results have certain guiding significance for study⁃ ing the process of moralite and oceanic crust subduction orogenesis (the process of land-ocean conversion).
    Zircon U-Pb Isotopic Geochronology and its Prospecting Significance of the Hamaling Granodiorite in Tongling
    LI Yi'nan , TAO Bo
    2022, 38(09):  43. 
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    The Hamaling Cu-Au-Mo Deposit is one of the important newly discoveries made recent⁃ ly in Tongling，it is characterized by strata-bound type+porphyry type+skarn type，which all belong to a uni⁃ fied magmatic hydrothermal metallogenic system.The deposit is located in the southwestern margin of the Tongling ore cluster area，the exploration degree in here is low.The Hamaling granodiorite as the main metallogenic magmatic rock geological body，in the past there were few systematic studies on it in geologi⁃ cal work，especially lacking of accurate isotopic chronological data.(LA-ICP-MS) U-Pb dating of zircon from the Hamaling granodiorite is conducted，it is concluded that its age is (140.4±1.9)～(137.7±1.1) Ma.It was formed in the Yanshanian period Early Cretaceous Epoch，which basically coincides with the diagene⁃ sis and mineralization period of the Tongling ore cluster area.The analysis results support the prospecting re⁃ sults of the Hamaling Cu-Au-Mo Deposit，and has important indicative significance for the prospecting work in this area.
    Complex Resistivity Characteristics of Oil-bearing Rocks in the Reservoir
    ZHANG Haojie, LUO Jian, HU Zhiyuan, WANG Qinying, HE Peiyong
    2022, 38(09):  48. 
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    In the exploration and development of oil and gas reservoirs，electrical differences is one of the most obvious features for reservoir identification，and the study of the complex resistivity characteris⁃ tics of oil-bearing rocks in reservoirs is important for quantitative evaluation of oil-bearing saturation. In this study，four samples of natural sandstone collected in the field were used as experimental materials.For these four rocks with different physical parameters (porosity，permeability，etc.)，oil-water repulsion experi⁃ ments were carried out under different oil saturation，and the complex resistivity amplitude-frequency and phase frequency curves of the four sandstone blocks were obtained respectively.The corresponding model parameters were obtained by inversion of Cole-Cole model，and the relationship between resistivity，polar⁃ ization and oil saturation of sandstone was obtained，which provides a reference for sandstone reservoir ex⁃ ploration and oil bearing evaluation.
    Progress of the Studies of Mining Subsidence:Based on the Literature Statistics of CNKI Journals from 2011 to 2021
    MAO Guozheng, FANG Yuan, LI Xinsen, OU Jun'er, FANG Xinran, ZHU Huimin, HE Peiyong
    2022, 38(09):  53. 
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    In order to scientifically promote the restoration of the ecology of the mined areas，a num⁃ ber of researches on the related field of the mining subsidence have been conducted. This study carefully analyzes the changes of the numbers of the related journals and papers，the most frequent citations distribu⁃ tion，the levels of researches，the sources of the publications，the contributing institutes and the collabora⁃ tive keywords of the journals and papers and then scientifically displays an outline of the development of the mining subsidence，which explains the current situation and characteristics in the field. The conclusion of the study shows that the foundation of the related researches on the mining subsidence is solid，while there is still room to improve for the extensive academic communications among research institutes.On this basis，the future research hotspots in the field of mining subsidence are further analyzed for reference for subsequent research.
    Discussion on Advance Judgment Method of Mining and Stripping Materials in Letpadaung Copper Mine
    SONG Weitao , LIU Li , LI Qiangbing
    2022, 38(09):  58. 
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    In the mining process of Letpadaung Copper Mine in Myanmar, if the results of rock powder sampling and testing of blastholes are not obtained in the area where mining and loading must be carried out due to production arrangement, in order to ensure the smooth production, the blasthole database analysis and on-site judgment of mineral analyzer are used to accurately judge the material type in ad⁃ vance, thus ensuring the mining and stripping production of the mine, meeting the demand for production guidance in the mining area, and providing a good reference for similar projects.
    Innovative Blasting Technology Based on Improving Explosive Efficiency Utilization of Mixed Emulsion Explosive
    CHEN Hongquan, XIE Jiande, ZHU Longlong , CAO Lei
    2022, 38(09):  61. 
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    Combined with the application of BCR（D）H-15 and BCRH-15E field mixed loading ve⁃ hicles in open-pit iron mines, the utilization of mixed loading emulsion explosive's explosive efficiency is improved essentially by optimizing blasting parameters, improving charging structure and adjusting explosive ratio. The application results in Gaocun Iron Mine show that, according to the usage of 1 000 t/a mixed emulsion explosive, the drilling volume can be reduced by 10%~12% after the hole network parameters are expanded, which saves 260 000 yuan/a of drilling cost and 890 000 yuan/a of blasting explosive cost. The average lump rate is reduced by about 2.0%, and the cost of lump crushing is reduced by about 880 000 yuan/a. The unit consumption of mixed emulsion explosive is reduced to 0.50 ~ 0.55 kg/m3, the linear meter blasting volume is increased by 10% ~ 15%, and the explosive is saved by 810 000 yuan/a. After adjusting the proportion of explosives, the blasting speed and work capacity of explosives are increased, the blasting effect is significantly improved, and the blasting cost is effectively reduced.
    Application of Mining Boundary Optimization of an Open-pit Mine Based on Datamine Software
    ZHAO Bin, XIE Dongwei
    2022, 38(09):  66. 
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    Taking an open-pit mine in Hegang City as the research background，the mining boundary optimization of the open-pit mine is realized by using Datamine software and NPV program. Block mod⁃ el is created through mining engineering software，technical and economic parameters such as mining cost， beneficiation cost，lean loss rate，stripping ratio and slope parameters such as bench height and slope angle are defined，and L-G graph theory is used to optimize the boundary. According to the change of profit coefficient，NPV program forms a series of open-pit mining boundary schemes. Taking the maximization of NPV (Net Present Value) determined by optimization as the judgment standard，and after manual processing，the final open-pit mining optimal boundary scheme is determined. The results show that Datamine software can effectively improve the working efficiency of determining the optimal boundary of open-pit mining and maximize the economic benefits of mining enterprises.
    Research on Ore Supply and Distribution Technology of a Skarn Iron Ore Based on 3D Modeling Technology
    ZHANG Yang , ZHAO Pengfei , CAI Zhenyin , ZHANG Duan, FANG Chengcheng , SONG Yewei
    2022, 38(09):  71. 
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    has always been an important task for mine technicians. In view of a series of difficulties brought by the complex hydrological and geological conditions of a skarn type with large water inflow iron ore deposit to production，the research on ore supply and distribution technology was carried out. Through the establishment of a three-dimensional ore distribution model，the distribution law of ore quantity and quality was analyzed and studied，the cut-off grade of ore extraction at the working face of the mine room was clarified，and the on-site ore supply and distribution process and process of ore and rock chute dumping，electric locomotive feeding in sections，and skip normal lifting were formulated，As far as possible， the ore rock segmentation proportion is expanded in the main pass to maximize the separation of ore rock. At the same time，the early warning and adjustment mechanism for ore supply and distribution was established，and the emergency treatment plan after a large fluctuation of ore drawing grade was defined. Through tackling key problems，the quality of ore extracted was stabilized，the recovery rate of beneficiation was improved，and the dilution rate of ore was reduced. The precautions in modeling and implementation were shared，which provided a reference for the supply and distribution of skarn iron ore.
    Exploration on Side Control Blasting of High Stage Second-step Mining Room in Zhangzhuang Iron Mine
    WANG Yufu , YU Jian , SUN Yongmao, WANG Nannan
    2022, 38(09):  75. 
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    In the second-step stoping of stage open stoping with subsequent filling method，the blasting damage to the filling body，resulting in a large number of filling body collapse，affecting the stabil⁃ ity of the filling body and stope mining safety. In order to effectively control the destruction of filling body caused by blasting operation，based on the engineering characteristics of Zhangzhuang Iron Mine，through theoretical analysis，the thickness of wall protection pillar of high-stage second-step stoping room and the blasting parameters of high-stage side wall are obtained. The boundary blasting effect is analyzed through industrial tests and three-dimensional scanning of the goaf. The results show that this high-stage secondstep stoping buffer blasting scheme has formed a good blasting effect，which has reference value for the same type of mines.
    Application of High Speed Tunneling Scheme of Hard Roadway in Coal Mine
    WANG Chao
    2022, 38(09):  78. 
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    In order to solve the problem that the rock stratum of the east return air roadway in Sihe mine is hard，which affects the tunneling efficiency and safety，a new underground roadway high-speed tunneling scheme based on drilling and blasting method is proposed. First of all，starting from improving the automation of underground operations，the efficiency of tunneling and drilling can be improved through drilling and loading machines，and the number of working face personnel can be reduced. Then，through the scheme of simulation analysis，the optimal hole spacing of underground blasting is scientifically and reasonably determined. Through the analysis of underground geological conditions，the blasting cutting scheme and charging scheme are determined. Finally，through the anchor cable reinforcement support and multi process cross parallel operation，the optimization of underground roadway support and tunneling oper⁃ ation is realized. The practice shows that the new underground high-speed tunneling scheme can improve the roadway support efficiency by 27.4% and the roadway tunneling efficiency by 66.7% with significant safety and economic benefits.
    Maintenance Measures of Stope Chutes and Key Points of New Chutes Design in Jinshandian Iron Mine
    PENG Zhaoxiang, XIONG Xianliang, XIANG Zhu
    2022, 38(09):  82. 
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    Taking Jinshandian Iron Mine as the background，this paper analyzes and studies the cur⁃ rent situation and causes of the destruction of the ore chutes in the upper and lower stopes of the east area. In order to reduce the destruction of the ore chutes in the future，for the ore chute that has been put into use，the screens are installed at the ore chute that has been put into use for layering，and the used shaft is closed in sections. For the newly-built chutes，the distance，position，section shape and size of the chutes are determined. These measures have been gradually applied in the actual production of Jinshandian Iron Mine，and have achieved positive results，which has certain reference value for the maintenance of chutes in similar underground metal mines.
    Strengthening Support Technology of Large-section Roadway at Intersection of Shaft Yard in Zhongjiu Iron Mine
    LI Guoping, SUN Maogui
    2022, 38(09):  87. 
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    Aiming at the problem of large-section roadway support at the 4# intersection point of the -550 m horizontal bottom yard in Zhongjiu Iron Mine，the technical scheme for strengthening the support of the large-section roadway at the intersection was explored. First，the distribution of the plastic zone un⁃ der the gradual excavation of the 4# intersection and its nearby large-section roadway is analyzed by numeri⁃ cal simulation. According to the most unfavorable plastic zone range，the long anchor cable support design is carried out to ensure that the anchor cable has sufficient anchoring capacity. At the same time，the range of backfill grouting of the roadway wall is determined according to the range of the plastic zone to improve the anchoring effect of the bolt，and form the "long anchor cable-coupling grouting" joint strengthening support method. The joint reinforcement support method has been well applied in the large-section roadway at the 4# intersection，and the roadway deformation and slag drop have been significantly improved.
    Evaluation of Geological Hazard Susceptibility in Qingyang County Based on Information Model Method
    LI Zhongquan
    2022, 38(09):  91. 
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    Geological hazard susceptibility evaluation in Qingyang County was carried out using the information model method. Firstly，the data source is processed，and five evaluation indicators are select⁃ ed，topography（slope and terrain relief），geological environment（engineering rock formation，fault buf⁃ fer），and human activities（road buffer）. The weights of the five evaluation factors were calculated by the AHP method，and the five types of information evaluation layers and the disaster points were superimposed and analyzed by the ArcGIS platform to obtain the susceptibility index. The natural breakpoint method was used to reclassify the susceptibility index，and the study area was divided into four categories: high-risk ar⁃ ea，medium-prone area，low-risk area，and non-prone area，which provided basic data for geological di⁃ saster risk zoning and prevention zoning.
    Simulation Analysis of the Influence Range of Dam Failure of Xiaomaidi Tailings Pond
    ZHANG Xue
    2022, 38(09):  95. 
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    In order to study the influence range of dam-break in the third phase of the tailings dam， the dam-break model is established considering the objective conditions such as the geographical location of the tailings dam site，the stability of the current dam height，the downstream topography，facilities and rainstorm. The influence range of dam-break is simulated by FLUENT fluid calculation software. The re⁃ sults show that the third-stage dam-adding scheme is feasible. After dam-break，the tail-discharge mortar body mainly evolves along the mountains and valleys in the downstream of the reservoir area，and a large number of tail sand will accumulate in the valleys in the downstream. Excavation of sand drains is adopted locally to ensure that there is no impact on residential houses on half-hill slopes.
    Research and Treatment of Dangerous Rock Diseases of Sangshuping Bridge on Jiuzhaigou Mianyang Expressway
    WANG Fei, BAI Hao, GAO Ping, PENG Zhuang, LI Jian, YANG Chaodong
    2022, 38(09):  98. 
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    In order to further study the stability of the dangerous rock mass of a project and reduce the impact and harm of the project implementation on the main works，taking the dangerous rock on the left side of Sangshuping Bridge of Jiuzhaigou Mianyang Expressway as the engineering background，on the ba⁃ sis of studying the slope shape，characteristics and failure mechanism of the dangerous rock mass，the overall stability of the dangerous rock mass is qualitatively analyzed and quantitatively calculated. Accord⁃ ing to the stability calculation results，considering that the stress compensation of the excavated natural slope is required under the rainstorm condition，the treatment scheme of "slope anchoring + column plate retaining wall embedding + rib column anchor cable reinforcement" is proposed to reinforce the bottom of the boulder dangerous rock body based on the sliding failure mode. After the implementation of the scheme，the effect is remarkable，the stability of the dangerous rock body is good，and the risk of the bridge project below is effectively reduced.
    Research on New Technology of Dry Grinding and Dry Separation of an Iron Ore
    WANG Peng, HU Zewu, SUN Jianxin, LIU Hemin, WANG Shuai, ZHU Haifeng
    2022, 38(09):  102. 
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    In order to solve the problems of high beneficiation cost and poor comprehensive index caused by water shortage in an iron mine in Western Inner Mongolia，a new technology of dry grinding and dry separation with roller mill and multi-stage particle separator as the core equipment was proposed on the basis of process mineralogy research. The industrial test results of the iron ore expansion project show that the new technology of dry grinding and dry separation can separate three kinds of narrow grade particle size ore particles in the grinding process，and discard the tailings by dry magnetic separation respectively. The total discarding rate is 11.5%，the magnetic iron grade of tailings is less than 1%，and the tailings are qual⁃ ified building materials. The results of dry magnetic separation conditions of iron ore powder show that when the fineness of iron ore powder is -0.074 mm account for 71.31%，the dry separation effect is better; the tailings discarding rate is 32.6%~44.56% by using different magnetic separators for dry separation. The magnetic iron grade of tailings is not much different from that of wet separation，and the total tailings dis⁃ carding rate is 40.35%~50.94%. The dry tailings of iron ore powder are stone powder，which can be used as building materials，cement raw materials，filling materials，etc.，or dry stacking. The new technology of dry grinding and dry separation of iron ore greatly improves the tailings discarding rate of iron ore，reduces the cost of beneficiation，and has wide applicability.
    Research and Practice on Optimization of Flotation Process in a Refractory Gold Mine
    PENG Keqi , ZHOU Ruixian
    2022, 38(09):  107. 
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    The flotation recovery rate of a refractory gold mine is only 80.95%，and the gold grade of tailings is as high as 1.0 g/t. In order to improve the flotation process index and strengthen the recovery of lost gold，the optimization test of flotation reagent system and the optimization test of middle ore regrinding process were carried out. The test results show that when the dosage of sodium carbonate，copper sulfate， butyl xanthate + ammonium dibutyl dithiophosphate and 2# oil is 5 000，500，470+250，100 g/t respective⁃ ly，the gold concentrate grade of 17.63 g/t，tailings gold grade of 0.74 g/t and gold recovery of 83.31% can be obtained by the combined middling regrinding process. After optimization，the flotation index of the pro⁃ cess is significantly improved，the gold concentrate grade is increased by 1.22 g/t，the gold grade of tail⁃ ings is reduced by 0.26 g/t，the gold recovery rate is increased by 2.36 percentage points，and the econom⁃ ic benefit is remarkable.
    Experimental Study on High Pressure Roller Mill - Pre-selection in Jinshandian Iron Mine
    WANG Zhongcai
    2022, 38(09):  111. 
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    In order to further improve the comprehensive benefits of the mine，in view of the prob⁃ lems of low grinding grade and large grinding particle size in Jinshandian Iron Mine of Wuhan Iron and Steel Co.，Ltd.，the pre-concentration treatment test of raw materials was carried out by high pressure roll⁃ er mill process. The effects of pressure，rotational speed and material moisture on the open-circuit process of high pressure roll mill and the effects of dry magnetic separation on the closed-circuit process and wet magnetic separation on the closed-circuit process were studied. The results show that the high pressure roll⁃ er mill process can effectively reduce the particle size of the raw ore. The material under the sieve is dis⁃ carded by wet magnetic separation，and the discarding rate can reach 46.43%. The iron grade and recovery of the concentrate are 42.26% and 89.98%，respectively. The material on the sieve was discarded by dry magnetic separation，the effect was poor，and the comprehensive discarding rate was only 9.61%.
    Experimental Study on Vibration Crushing Evaluation Based on Fractal Dimension of Crushing
    SHEN Jun, CAI Gaipin, KUANG Zhiqiao
    2022, 38(09):  115. 
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    In order to effectively evaluate the performance of ore crushing equipment and make crushing equipment run more efficiently and energy-efficiently，according to the particle size distribution characteristics of ore after crushing，three different ore were crushed by vibration，and the particle size dis⁃ tribution，crushing fractal dimension calculation and other crushing effect evaluation indexes were studied. The results show that the particle size distribution after crushing has obvious fractal characteristics，and the fractal dimension of crushing can be used to describe the distribution state of particles，and the fractal dimension of crushing is basically consistent with the change trend of other crushing evaluation indexes. The absolute values of the quadratic coefficients after fitting the four sets of crushing test data are com⁃ pared，and the difference between the absolute values of the coefficients is within 10%. The crushing frac⁃ tal dimension can be used as one of the crushing evaluation indexes.
    Test of Flotation Column in Reverse Flotation of a Hematite Ore in Hainan
    ZHU Hailong, ZHANG Ling, WU Hongqiang
    2022, 38(09):  119. 
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    In order to improve the grade of magnetic separation concentrate in a hematite concentra⁃ tor in Hainan，the anionic reverse flotation test of cyclone-static micro-bubble flotation column was car⁃ ried out. The feed rate of flotation column determined by conditional test was 230 mL/min，the dosage of collector was 1 800 g/t，the pressure of roughing circulating pump was 0.14 MPa，the flotation concentra⁃ tion was 38%，and the air intake of roughing flotation column was 1.0 m3/h. The test results show that un⁃ der the condition of ore grade of 49.44%，a good index of concentrate yield of 57.37%，iron concentrate grade of 62.62% and iron recovery of 72.66% was obtained by desulfurization + one roughing one scaveng⁃ ing reverse flotation process. The test shows that the flotation column has the advantages of short separation process and high separation efficiency in hematite flotation.
    Study on Iron Separation and Sulfur Removal Process of a Lead-zinc Flotation Tailings in Xinjiang
    LI Wenhui
    2022, 38(09):  123. 
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    In order to reduce the excess sulfur in iron concentrate，an experimental study on desul⁃ phurization of iron concentrate was carried out in view of the difficulty in separating iron and sulfur from iron concentrates in low intensity magnetic separation of high-sulfur lead-zinc flotation tailings in a certain place in Xinjiang. According to the symbiotic inlaid relationship between magnetite and pyrrhotite，the state and characteristics of sulfur-containing minerals，the magnetic-flotation combined process was used to flotate the coarse concentrate obtained by magnetic separation，adding TZ-n+TZ-c combination regula⁃ tor，using the interaction and synergistic effect of the combination agents，finally obtained a qualified iron concentrate with sulfur content of 0.14%，total iron grade of 65.42%，and iron recovery rate of 78.85%. The process successfully achieved the effective separation of iron and sulfur，reduced the sulfur content in the iron concentrate from more than 5% to less than 0.15%，improved the quality of the iron concentrate， reduced the cost of reagents by 1.9 million yuan/a，and achieved significant economic benefits.
    Study on Mineral Grinding Process Based on METSIM Software
    DU Pan
    2022, 38(09):  126. 
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    In order to quickly determine the most suitable equipment model and parameters in indus⁃ trial production and reduce the energy consumption in the grinding process，in view of the complex charac⁃ teristics of multi-parameter，slow time-varying，nonlinear and large lag in mineral crushing and grinding， and the large fluctuation and difficult control in the grinding and classification process，it is easy to cause poor product quality，large resource consumption and high energy consumption. The simulation model of SABC beneficiation and grinding process is built. The model establishes four crushing and grinding process⁃ es to improve the model's adaptability to the scene range and operational flexibility，and develops an EX⁃ CEL interface for data exchange. While the model automatically simulates the entire crushing and grinding process to obtain the optimal equipment model and parameters，it can intuitively and quickly help field op⁃ erators adjust equipment parameters.
    Exploration of High Efficiency and Low Cost Beneficiation Process for Baima Vanadium Titanomagnetite
    ZHOU Chuan
    2022, 38(09):  130. 
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    In order to improve the production efficiency and reduce the production cost from the opti⁃ mization of beneficiation process，based on the process mineralogy characteristics of vanadium-titanium magnetite in Baima mining area of Panzhihua，the coarse tailings discarding of raw ore，the comparison of classification effects of various methods of primary grinding，the embedded tailings discarding process of secondary grinding classification system，the grinding efficiency of secondary and tertiary mills were stud⁃ ied. A new beneficiation process flow for vanadium-titanium magnetite in Baima mining area was pro⁃ posed，and the feasibility of the new process flow was analyzed and discussed. It is concluded that through the process transformation，the purpose of further improving the production efficiency and reducing the cost of the concentrator is achieved，which can provide useful reference for other similar mines.
    Impact of Impregnation Process on Large Scale Graphite Materials
    WANG Wei, SHEN Baojin, LI Qingbo, KUANG Geping, LI Tao, PEI Xiaodong
    2022, 38(09):  134. 
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    In order to improve the performance of graphite products, the impregnation process was studied for the problems of low bulk density and poor performance of large-size graphite. The results show that when the modified coal tar pitch with a softening point of 120 ℃ is used as the impregnating agent, and the impregnation temperature is 210 ℃, the impregnation pressure is 2.5 MPa, the impregnation time is 6 h and the cooling pressure is 3.0 MPa, the weight gain rate and bulk density of large-scale graphite products reach 14.12% and 1.828 g/cm3, respectively. After roasting, the impregnating agent volatilizes, resulting in a decrease in the bulk density of the product. Therefore, the effect of the number of impregnation roasting times on the bulk density of the product was studied. It was determined that the two-baking and one-leach⁃ ing process was adopted, and the product could reach a better level of bulk density of 1.794 g/cm3 and the maximum comprehensive efficiency.
    Application of High Pressure Roller Mill Parallel Process in Washan Concentrator
    WU Haojun , JIANG Hong , ZHANG Jun , XU Baofeng
    2022, 38(09):  137. 
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    In order to realize the comprehensive utilization of refractory and extremely poor iron ore， improve the output of iron concentrate，stabilize the grade of concentrate，reduce the cost and increase the efficiency and balance the economic benefit，aiming at a series of problems existing in the production in Washan concentrator，the parallel high pressure roller mill process of extremely poor magnetite is put for⁃ ward. The domestic high pressure roller mill，Shenke wet double screen and other crushing and separating equipment are introduced to realize the successful application of the parallel process of high pressure roller mill. Through the actual operation optimization of the high pressure roller mill，the concentrate grade is sta⁃ bilized，the production capacity of the concentrator is improved，and a series of problems restricting the de⁃ velopment of the concentrator are solved，and the comprehensive benefits were remarkable.
    Optimization of Sorting Process for Gongchangling Fine-grained Magnetite
    YU Ying , LI Hong , SHI Jianjun, LI Chunyan, WANG Jialong, PEI Naiyi
    2022, 38(09):  141. 
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    With the change of ore properties，the processing capacity of the secondary separation op⁃ eration area of the Changling concentrator increases，which causes problems such as large fluctuation of flo⁃ tation flow and fluctuation of concentrate index. In order to efficiently recover fine-grained magnetite，the high-efficiency magnetic separation process was used to replace the flotation process，and the elutriation machine was used to treat fine-grained magnetite. The effects of feed concentration，magnetic field strength and water flow of the elutriation machine on the separation index were studied. The results show that under the optimum conditions of TFe grade of 51.43%，feed concentration of 40%，fixed magnetic field strength of 94.4 kA/m，circulating magnetic field strength of 86.4 kA/m，compensated magnetic field strength of 86.4 kA/m and water flow of 1 150 L/h，the iron grade of concentrate is 67.03%，the recovery rate is 93.82%，and the iron grade of tailings is 11.26%.
    Mineralogical Characteristics of a Low-grade Vandium-titanium Magnetite Ore in Shaannxi
    LIU Fuyuan
    2022, 38(09):  144. 
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    In order to promote the development and utilization of a low-grade vanadium-titanium magnetite ore in Shaanxi，the detailed process mineralogy characteristics of the ore samples were studied by means of mineral phase microscope，scanning electron microscope and X-ray energy spectrum. The re⁃ sults show that the main minerals in the ore are different in the degree of alteration and the distribution of beneficial elements. The theoretical grade of iron concentrate is 52.44%，and the theoretical grade of titani⁃ um concentrate is 47.83%. Strengthening the experimental study of titanium separation is an important di⁃ rection to improve the utilization value of resources. The results provide a basic reference for the develop⁃ ment and utilization of vanadium-titanium magnetite resources.
    Experimental Study on Copper Beneficiation of a High iron-sulfur Concentrate
    LIN Xiaofeng, LIU Jun, WANG Shuai, YU Xi
    2022, 38(09):  148. 
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    In order to efficiently recycle the copper resources in a high-speed iron-sulfur concen⁃ trate，the flotation process condition test was carried out based on the analysis of the ore properties of the sulfur concentrate with a sulfur grade of 18.53% and a copper content of 0.724%. The research results show that under the condition of grinding fineness of -0.043 mm accounting for 85%，with lime as inhibitor and C330 as collector，the copper concentrate with a copper grade of 16.90% and a copper recovery rate of 47.32% can be obtained after one roughing and six times of selective open-circuit flotation tests.
    Application and Optimization of Semi-autogenous Grinding Process in Zhongguan Iron Mine
    XIE Anming, ZHANG Yikun, LI Yanke, WANG Zheng
    2022, 38(09):  151. 
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    In order to solve the problem of serious shortage of processing capacity of self-grinding machine in Zhongguan Iron Ore Dressing Plant，the self-grinding process is transformed into semi-selfgrinding process by adding steel balls to improve the grinding effect. At the same time，by changing the cy⁃ lindrical sieve at the discharge end of the self-grinding mill into a self-return sieve，the size of the sieve hole is increased，the ability to remove the refractory stone and the efficiency of the ball mill are improved， and the problem of discharging refractory stone is solved. Increase the iron remover to eliminate the influ⁃ ence of large iron on the process；adjust the ball mill steel ball ratio to improve the grinding efficiency；opti⁃ mize the material and structure of the self-grinding mill liner to improve the service life and operation rate. Through a series of optimization and adjustment，mill processing capacity exceeds the design value，energy consumption and recovery rate reached the industry leading level；the formed SABC-B process has the characteristics of small process modification，low cost and good effect，which can provide experience refer⁃ ence for mines that need process optimization due to changes in ore properties.
    Process Transformation Practice of 55 000 t Grinding-Floating System in a Copper Mine
    LIU Keshuang , GAO Liang
    2022, 38(09):  155. 
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    In order to improve the recovery rate of target minerals，the flotation process was investigat⁃ ed for the problem that a large number of copper-containing intergrowths were circulated in the flotation sys⁃ tem due to the fine dissemination of useful minerals in a copper mine. The results show that the copper grade of concentrate in one stage roughing of series one is 18%~20%，which can be directly used as final concen⁃ trate; through the research on regrinding flotation test of concentrate in one stage scavenging，concentrate in two stage cleaning of series one and concentrate in three stage cleaning of series two，it is proved that the flo⁃ tation recovery rate can be increased by ten percentage points through regrinding flotation on middling of one stage scavenging，copper grade can be increased by three percentage points through pre-classification and regrinding concentrate on concentrate in two stage cleaning of series one and concentrate in three stage cleaning of series two. After the technological transformation of the process is completed，the two series of cleaning for scavenging tailings are directly transported to the ball mill pump pool，which can reduce the wa⁃ ter volume by about 300 m3，effectively reducing the impact on the roughing process. The concentrate grade is increased from 18% to about 20%，and the recovery rate is increased from 87.80% to 89.83%.
    Design and Analysis of Vibration Reduction System of FV-1200 Vertical Shaft Impact Crusher
    ZHAO Dongbo, QU Di , CAI Hongfei , KANG Jian
    2022, 38(09):  159. 
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    In order to make the FV-1200 vertical shaft impact crusher run smoothly under the work⁃ ing condition of high speed，aiming at the working condition of the equipment and its vibration influence on the crushing cavity and motor seat of the main engine due to the impact force and centrifugal force of the material under the running state，through the research on the working principle and structural form of the FV-1200 vertical shaft impact crusher，the design of the vibration reduction system and the auxiliary analy⁃ sis of the three-dimensional software are carried out，and the analysis results of the compression deforma⁃ tion of the vibration reduction pad are obtained. Finally，the analysis results are compared with the industri⁃ al test results，and the validity of the analysis results is obtained. It shows that the vibration reduction sys⁃ tem meets the design requirements，which can provide reference for the subsequent optimization design and the smooth operation of the equipment.
    Research on the Application of New Single-stage Hammer Crusher in Super-large Sand and Gravel Aggregate Mines
    CHEN Shaoxue, ZHAO Dongming
    2022, 38(09):  163. 
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    In order to meet the coarse crushing process design requirements of the new single-stage hammer crushing in the adit-pass development system，taking the realization of high-efficiency coarse crushing in a super-large limestone mine chamber in Chizhou，Anhui Province as an example，aiming at the characteristics of the coarse crushing equipment under this condition，such as high crushing efficiency， small equipment size and controllable powder content，the raw ore particle size analysis，industrial-scale crushing industrial test and production practice application research of raw ore cumulative processing ca⁃ pacity of more than 100 million tons were carried out. The research shows that the new single-stage ham⁃ mering industrial crushing -45 mm product has high primary crushing yield，low crushing cost and low in⁃ vestment intensity，but the silt content is slightly higher. The new single-stage hammering is suitable for the coarse crushing of construction sand aggregate with medium compressive strength.
    Introduction and Application Status of Typical Shaker Equipments
    LIU Yinan, SUN Rui
    2022, 38(09):  167. 
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    With the continuous reduction of ore grade，in order to obtain qualified mineral process⁃ ing products，the various mineral processing process and equipment are continuous being updated and im⁃ proved. In view of the advantages of green environmental protection and simple equipment of shaker benefi⁃ ciation in gravity separation，shaker beneficiation is vigorously developed and efficient shaker is promoted. Combined with the research status of shaker in China，the typical shaker types such as 6-S shaker，spring shaker，suspension multi-layer shaker，Yunnxi type shaker，table floating shaker and the factors affecting the sorting index of shaker were analyzed and discussed.According to some application practice of mine shaker，the application status of shaker is summarized，and the problems in shaker application are ana⁃ lyzed，provide support for development of shaker equipment in mineral processing．
    Process Optimization of Filter Rress in Tailings Treatment
    LI Yanke, WANG Zheng , ZHANG Yikun, XIE Anming , ZHANG Qingbo
    2022, 38(09):  172. 
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    In order to improve the efficiency of tailings treatment and avoid the decrease or stop of grinding and separating production due to the untimely treatment of tailings，aiming at the problems of high viscosity or water content of filter cake，high consumption of filter cloth，filter plate and pump parts，low operation efficiency and high maintenance cost in the process of tailings pressure filtration in an iron mine， the dosage of PAM flocculant and the parameters such as feeding pressure，feeding time，pressing time and back flushing time during the operation of filter press were studied. It is found that the accurate dosage of PAM flocculant can effectively solve the problem of high viscosity of filter cake. Adjusting the operating parameters of the filter press can effectively reduce the moisture of the filter cake; selecting the appropriate filter cloth is the best solution to improve the treatment efficiency of the filter press. In addition，timely maintenance and strengthening management are conducive to improving the efficiency of tailings treatment， reducing consumption costs，and ensuring the stable，efficient and economic operation of the filter press.
    Application of SKZ Type Hydraulic Controlled Three - slice Slurry Valve in Ore Dressing in Sijiaying Yanshan Iron Mine
    ZHENG Kexin , ZHAO Jinshuai
    2022, 38(09):  175. 
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    In order to solve a series of production and environmental protection problems in Sijiaying Yanshan Iron Mine，such as the wear of valves and pipelines caused by the coarse particulate materials contained in the pipeline transportation medium under the scouring effect of slurry liquid，the jamming of valves，the failure of valves to open and close and the lax closing of valves during the opening and closing process caused by coarse particulate materials and broken steel balls，the string blockage of pipelines in the switching process caused by the lax closing of valves，which affects the continuity of production，the overflow of slurry caused by the leakage of pipelines and valves，and the environmental pollution，the opti⁃ mal configuration of valves is realized by selecting appropriate slurry valves according to the different posi⁃ tions of slurry media and pipelines. Furthermore，it can improve a series of problems such as shutdown， production reduction and environmental pollution caused by faults in the use of valves，and provide experi⁃ ence for the selection of pulp valves in other mining enterprises.
    Study on Design Scheme of Filling Station in a Small Metal Mine
    LIU Tiejun, LE Minjie, XU Gaofeng
    2022, 38(09):  178. 
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    When selecting the design scheme of filling station in small metal mines，mining meth⁃ ods，properties of tailings，cementitious materials，performance of dehydration equipment，etc. should be considered. At the same time，multi scheme technical and economic comparison should be carried out to fi⁃ nally determine the design scheme suitable for enterprises. By introducing the whole process of the design of a filling station in a small metal mine，this paper points out the key problems that should be paid atten⁃ tion to in the design process from the aspects of the determination experiment of physical and chemical properties of tailings，the hydraulic experiment of filling slurry pipeline transportation，the analysis of the experimental results of filling slurry strength ratio，the economic comparison of different filling process schemes，and the verification of key equipment selection results. At present，the filling station has been successfully commissioned and has been in trial production for nearly half a year，and the underground goaf has been successfully filled with nearly 80 000 m3. From the design example，it can be concluded that when determining the process scheme of the filling system，one-stage dehydration scheme should be adopt⁃ ed as far as possible，and the system is simple and convenient for operation and management；For filling mines with ultra-fine tailings and low tailings yield，it can be tried to use unpowered deep cone thickener for dewatering and filling，which has high underflow concentration and pressure raking risk for long-term storage. The design scheme has certain reference significance for the design and production of fine-grained and small-scale filling mines.
    Research and Application of Intelligent Truck Dispatching System in Open-pit Mine
    ZHANG Jun, FAN Yongkai, LI Dongqi
    2022, 38(09):  184. 
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    Open-pit mine is a large-scale production enterprise with stripping as the core and han⁃ dling as the link. The efficiency of equipment and the level of production organization largely determine the benefits of the enterprise. The composition of intelligent truck dispatching system in open-pit mine，the key technology of intelligent dispatching and the practical application effect of card dispatching system are introduced. Based on the new generation of wireless communication technology，high-precision positioning technology，intelligent vehicle terminal equipment and linear programming theory，the mathematical model of mine traffic flow planning is established，and the traffic flow calculation on each optimal path is complet⁃ ed on the principle of realizing the maximum output under the premise of a certain number of vehicles，So as to achieve the goal of efficient and free dispatching of open-air trucks. The intelligent card dispatching system of open-pit mine and the ore blending information and production plan information of digital mining software platform can realize the stability of mine ore grade. The future development direction of intelligent truck dispatching system in open-pit mine is unmanned open-pit mining，but it is also necessary to further improve the collaborative operation technology level of high-precision positioning technology，intelligent hazard perception technology，communication technology and other mine systems.
    Research and Application of Intelligent Unmanned Underground Rail Transportation System in a Metal Mine
    ZHANG Xin
    2022, 38(09):  189. 
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    Aiming at the traditional transportation mode of manual driving and manual ore drawing used in underground rail transportation of a metal mine，the underground rail intelligent unmanned trans⁃ portation control system is developed. Wireless communication，automatic control，locomotive autonomous dispatching control，laser radar，monitoring and monitoring，safety monitoring and fault diagnosis technolo⁃ gies are adopted to transform the frequency conversion and automatic control of the electric locomotive， build a wireless transmission network on the rail transport line，and develop and design the underground loading and unloading system and turnout signal system，so as to realize the intellectualization，unmanned and high efficiency of the whole process from loading to unloading of the underground rail transport system. Since its completion，the underground rail intelligent unmanned transportation control system has been op⁃ erated stably，safely and reliably，and the transportation efficiency has been greatly improved compared with the original system. There is no need for human intervention in the whole transportation process，and the post personnel have been removed，which greatly saves labor costs，greatly improves the working envi⁃ ronment of operators，improves the intelligent level of mines，and realizes the intrinsic safety of the trans⁃ portation system. The successful application of underground rail intelligent unmanned transportation control system in a metal mine meets the requirements of "mechanization，automation and intellectualization" in the construction of domestic non coal underground mines，and provides practical experience for the suc⁃ cessful construction of other mines.
    Research on Construction Technology of 3D Digital Ventilation Model in No.2 Mining Area of Jinchuan Company
    ZOU Long
    2022, 38(09):  194. 
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    In order to realize the informatization and automation of mine ventilation management, a digital ventilation model is preliminarily established based on the basic data of the roadway by using the iVent software of Changsha Digital Mine Company. The ventilation model is modified by the measured data in spring and summer, so that the resistance of each roadway is consistent with the field, and the friction re⁃ sistance coefficient is calculated by wind measurement and resistance measurement, so that the three-di⁃ mensional model is more consistent with the actual ventilation situation of the mine, and the three-dimen⁃ sional visual modeling and wind flow simulation of the mine ventilation are realized. The establishment of three-dimensional ventilation model improves the management efficiency of mine ventilation, controls the underground ventilation situation in real time, makes improvement plans quickly, enhances the safety of un⁃ derground production, and improves the economic benefits of mine production. It has a good application prospect.
    Design of Digital Perforation System for Metal Open-pit Drilling Rig
    MA Liancheng, WANG Huaiyuan, ZHONG Hao, CAO Yang, JIANG Changbin
    2022, 38(09):  200. 
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    Aiming at the problems of cumbersome operation procedures, high work intensity and low efficiency in the perforation link of traditional metal open-pit mine, the digital perforation system of openpit mine drilling rig is designed to form two modules of navigation positioning and information management and operation module. Each module is analyzed and described in detail. The system has many functions, such as accurate drilling positioning, automatic hole depth measurement, rock stratum identification, auto⁃ matic hole layout and so on, so as to effectively improve the production efficiency, which has an important reference for intelligent mining of open-pit mine.
    Application of an Automatic Cable Retraction Device for Electric Excavator in Open-pit Mines
    YAN Guijun , LIU Wen
    2022, 38(09):  203. 
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    Aiming at the problem that the cable dragging of the electric excavator in the production process of Jiusteel Jingtieshan Iron Mine affects the safety of production，an automatic cable retraction de⁃ vice for the electric excavator in open-pit mine is designed.The field application shows that the device real⁃ izes the automatic and unmanned retracting of the high-voltage cable of the open-pit mine electric excava⁃ tor，effectively solves the serious electric shock risk caused by manual dragging of the live high-voltage ca⁃ ble (6 kV)，and ensures the safety of workers.
    Investigation and Analysis of Occupational Hazards and Improvement Measures in an Underground Iron Mine in Anhui Province
    DING Zhiming
    2022, 38(09):  206. 
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    In order to ensure the health of the occupational health practitioners in mining enterpris⁃ es，the occupational health field survey method，occupational health detection method and occupational health checklist analysis method were used to investigate and evaluate the current situation of occupational disease hazards in an underground iron mine in Anhui Province. The results showed that the management system of occupational health in the iron mine was complete，and the main occupational hazard factors were dust and noise. The qualification rates of dust and noise were 100% and 76.7% respectively，and the maximum noise intensity was 101.0 dB（A）. In the occupational health examination in 2021，one person has occupational contraindication of noise，one person has occupational contraindication of dust，and there is no suspected occupational disease. The occupational disease prevention work of this underground iron mine basically conforms to the requirements of relevant national laws and regulations，but due to the limita⁃ tions of industrial processes and equipment，it is impossible to effectively control the noise hazard from the source. The company should strengthen the intelligence and automation of process equipment and second⁃ ary prevention of occupational health，continue to improve the occupational health management system， and ensure the occupational health of operators.
    Application and Research of Foreign Soil Improvement Technology in Ecological Reclamation of Mine Wasteland
    LI Qintao, PENG Tao, YANG Jian, HE Jianqi
    2022, 38(09):  210. 
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    In order to study the application of foreign soil improvement technology in the ecological reclamation of mine wasteland，aiming at the ecological reclamation problem of mine wasteland in China， the present situation and harm of mine wasteland in China were analyzed. The present situation of ecologi⁃ cal reclamation and technology application of wasteland at home and abroad was introduced，especially the practicability and objective bottleneck of foreign soil improvement technology in the ecological reclamation of mine wasteland. How to optimize the foreign soil improvement technology and its application prospect were discussed，in order to provide new ideas for mine ecological restoration and land resource utilization in China.
    Slope Stability Analysis of an Open-pit Iron ore Mining Based on Swedish Stripe Method
    WANG Wanlu, WANG Lidie, XIA Gangyuan, HOU Kepeng
    2022, 38(09):  215. 
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    Slope instability is one of the geological disasters that often occur in open-pit mines， which seriously affects the safety of mine production. The stability evaluation of open-pit mine slope is helpful to prevent the occurrence of slope disasters. For the slope of an open-pit iron mine in Yunnan，a typical slope profile is selected，and the sliding safety factor is calculated by using the Swedish slice meth⁃ od in Lizheng software. The safety factor and the position of the most dangerous sliding surface of the select⁃ ed typical slope profile under normal，flood and special conditions are obtained，and then the stability of the stope slope is analyzed. The results show that all slope profiles under normal working conditions are in the safe and stable range；For the slope profile under special working conditions，only the highest steep slope profile A—A is unstable. In general，the slope is generally stable，but there is still possibility of land⁃ slide in some parts.
    Geological Environmental Problems and Treatment of Abandoned Open-pit Limestone Mines
    SUN Rui
    2022, 38(09):  219. 
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    Taking Jinyun Quarry in Liqiao Town，Xuancheng City as an example，the problems of unstable slopes and serious ecological damage in abandoned open-pit limestone mines are sorted out. In or⁃ der to solve this problem，through the high and steep slope cutting solidification and greening engineering， site leveling and covering soil reclamation，site drainage transformation，vegetation maintenance and other means of governance，eliminate geological disasters，repair damaged topography，and make full use of land resources. The treatment project of Jinyun Quarry provides a reference for the treatment of the geologi⁃ cal environment of the abandoned open-pit limestone mines in the area.
    Stability Analysis and Control Measures of Close Coal Seam Mining Roadway in Dafosi Mine
    SHANG Fa, ZHUO Qingsong, HU Liefei
    2022, 38(09):  222. 
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    In the process of underground close coal seam mining in Dafosi Coal Mine of Binchang， Shaanxi Province，the floor stress after the upper seam mining affects the stability of the lower seam road⁃ way，and the surrounding rock deformation of the roadway is serious，which has seriously affected the safe and efficient production of the lower seam mining face. In order to solve the problem of roadway stability control in close coal seam mining，the influencing factors of surrounding rock deformation in the lower coal seam roadway are analyzed by theoretical analysis，borehole peeping analysis，and on-site investigation and Study on the quality of bolt and cable support. The results show that the influence depth of the upper coal seam floor is 26.4m. The borehole peeping analysis shows that the integrity of the surrounding rock of the roof is better than that of the surrounding rock of the wall. The loose zone of the surrounding rock of the wall is within 3.3m and the coal pillar side is larger than the working face side. According to the quality in⁃ vestigation of anchor cable support，the initial anchor force of the side anchor cable is not qualified，and the construction technology is poor. By strengthening the support strength of the side，improving the anchor⁃ ing force of the anchor cable，optimizing the support parameters of the anchor mesh cable，strengthening the support in sections，and improving the drilling construction quality，the deformation of the surrounding rock of the tunnel can be controlled. The monitoring information feedback shows that the technology can completely control the deformation of the surrounding rock of the roadway，ensure that the mining roadway will not be expanded within the service period，and provide the necessary basic conditions for safe and effi⁃ cient mining of the working face.
    Analysis of Geophysical Prospecting Work in a Goaf Based on Microdynamic Detection Method
    WU Shixiong
    2022, 38(09):  228. 
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    A subsidence crack was found on the surface of a mining area，and the subsidence range and subsidence volume were expanding. In order to control the ground subsidence crack，the microdynamic detection method was used to predict the underground space. By arranging the microtremor survey results of 8 exploration lines and 53 physical points，the Vs profile diagram in the area is measured. The Vs profile dia⁃ gram is interpreted in combination with the geological profile，and the location of the ground fissure is de⁃ termined by the inversion method. The research shows that the microdynamic detection method has high ap⁃ plicability in the ground research of goaf，and the result is basically consistent with the drilling results.
    Analysis of Slope Stability of Yanshan Iron Mine Based on GEO-SLOPE
    HUO Dandan , YANG Gang , YANG Zhibin , ZHANG Hongyu, XU Chengyan, YU Shijie
    2022, 38(09):  233. 
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    Slope stability is directly related to the safety of mine production, and is one of the key factors affecting the economic benefits of mines. In order to explore the stability of the dip slope and guide the optimal design of the mine, taking the current slope of the east side of Yanshan Iron Mine as the re⁃ search object, selecting three representative profiles, comprehensively considering the influence of factors such as rock mass weight, groundwater and blasting vibration，the slope stability of Yanshan Iron Mine is studied by using GEO-SLOPE simulation software. The results show that the overall stability coefficients of the east side slope above -157~-187 m are greater than the limits of the safety factor, the overall stability is good, and the local stability is low. In combination with the current situation that the overall slope stability is good, on the premise of monitoring and controlling the local slope, the angle optimization of the deep rock slope can be further carried out to reduce the boundary pressure and improve the recovery of the side ores.
    Stability Analysis and Control of South Stope Slope of Mengku Open-pit Iron Mine in Xinjiang
    QIU Yongfu
    2022, 38(09):  237. 
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    Ensuring the safety and stability of slope plays an important role in the safety of produc⁃ tion and construction equipment and personnel.In order to ensure the safety of the south open-pit slope of Mengku Iron Mine in Fuyun County in Xinjiang，the indoor and outdoor mechanical tests of rock mass pa⁃ rameters were carried out on the south slope，and the limit equilibrium method was used to calculate the sta⁃ bility of the slope profile. The results show that the stability coefficient of the south slope does not conform to the relevant specifications and has the risk of landslide.Therefore，the anchor cable（rod）frame beam structure system was used for comprehensive treatment of the slippery area，and the limit equilibrium meth⁃ od was used to analyze the stability of the treated area. The calculation results show that the stability coeffi⁃ cient of the southern slope after treatment is significantly improved and conforms to the relevant specifica⁃ tions. The anchor cable（bar）frame beam structure system has a certain reference function for similar mine slope treatment.
    Dynamic Response and Stability Analysis in a Tailings Dam
    SUN Shaohua, DUAN Weiping, MAO Zhiyuan, QIU Yu, YANG Qiangsheng
    2022, 38(09):  241. 
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    Using equivalent linear method to analysis the dynamic response and stability of a tailings dam and accumulation.The result shows that the acceleration and displacement distributions of the current tailings dam body are basically the same as those of the embankmemt body up to elevation 1 375 m，the ex⁃ treme value of the acceleration and displacement response appears in crest region，and the embankmemt el⁃ evation of tailings dam has little influence on the acceleration and dynamic displacement of the dam body; the maximum value of the dynamic shear stress appears near the foundation surface and decreases gradually towards the dam slope and dam crest，and as the embankmemt elevation rises，the maximum value of the shear stress increases;under dynamic action，there is no transfixion liquefaction region in the current dam body and the embankmemt body up to elevation 1 375 m of the tailings pond，and the dynamic stability safe⁃ ty factor of the embankmemt body up to elevation 1 375 m is lower than that of the current dam body，but it also can meet the requirements of anti-sliding stability，and the dam body as a whole is safe and reliable af⁃ ter ore drawing scale is expanded.
    Mechanism and Prevention and Control of Overburden Separation Slurry Pipeline in Diameter Reducing Xinyi Mining Industry
    ZHOU Zhiyuan, SHEN Chuanbo , WANG Zhiyi
    2022, 38(09):  246. 
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    In order to reduce the influence of slurry pipeline necking on overburden separation slurry filling work，the mechanism of pipe internal diameter reduction was analyzed，and related experiments and engineering practices were carried out to explore the prevention measures of slurry pipeline necking and pipeline attachment softening and dredging scheme.The results show that there are three main types of pipe diameter reduction: attachment type，deposition type and comprehensive type.The main types of pipe diame⁃ ter reduction are attachment type and deposition type.It can reduce the diameter of attachment type by im⁃ proving the smooth degree of pipeline，improving the composition of fly ash，increasing the pressure of slur⁃ ry transport，continuous slurry transport and regular flushing of pipeline，which also has a certain effect on the deposition type.0.25 mol/L acetic acid solution can be used as solvent to clean and dredge the slurry pipeline，and the effect is good.Through the above measures，the diameter reduction of slurry pipeline can be reduced to ensure the smooth progress of overburden separation slurry filling work.
    Analysis and Application of Grinding and Classification Effect of a Vanadium Titanomagnetite
    WANG Xiaokai , LI Wei, WANG Youjun
    2022, 38(09):  249. 
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    In order to find out the influence of ore properties on iron separation production and solve the bottleneck restricting the grinding capacity of ball mill process，aiming at the problems of grinding clas⁃ sification，iron concentrate demagnetization and old production process in iron separation process，the com⁃ bined classification process of cyclone and high-frequency fine screen was reformed，and the proportion of steel balls in ball mill，the optimization of steel ball supplement system and the transformation of threestage grinding were carried out，which effectively dissociated mineral crystals，improved the efficiency of mill and increased the content of intermediate easy-to-separated particle size.Optimization and innovation of iron-dressing process gradually adapt to the mine' first rich then poor，first easy then difficult' mining trend，enhance the bearing capacity of mineral processing system，stabilize the quality of iron concentrate， release the iron production capacity at the same time，reduce the production cost of iron concentrate.
    Blasting Safety Technology for Quarrying and Damming of Tailings Pond
    FANG Yi
    2022, 38(09):  253. 
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    For quarrying and damming in the tailings reservoir area with complex environment，it is required that the construction speed is fast，the process is simple and easy to operate，the final slope is sta⁃ ble，the construction cost is low，the rock fragmentation after blasting is appropriate，and the blasting vi⁃ bration and flying objects do not harm the surrounding buildings. For different areas，different blasting technologies shall be adopted. The main mining area adopts deep hole bench millisecond blasting and hole by hole relay blasting. The delay blasting technology inside and outside the hole is adopted near the civil houses，the blasting vibration is controlled by the air interval charge，and the blasting hazard is controlled through safety accounting. So that the blasting excavation can be carried out safely and quickly. Compared with presplitting blasting technology，it has the characteristics of simple process，convenient implementa⁃ tion and high mining efficiency.
    Experiment for Determination of Metallic Elements in Molybdenum Concentrate by XRF Internal Standard Method
    MENG Qingsen, WANG Yunxiao, ZHAO Zhanmei, GU Bo, FENG Yahui, PAN Shenglin
    2022, 38(09):  257. 
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    In order to further improve the convenience and selectivity of quantitative detection tech⁃ nology of major and minor elements in molybdenum concentrate，aiming at molybdenum，copper，iron，sil⁃ icon，lead，calcium and other elements in molybdenum concentrate，X-ray fluorescence spectrometry in⁃ ternal standard method was used to study the technical problems such as instrument working conditions， standard curve making，sample weight determination，oxidant selection，flux selection and internal stan⁃ dard element addition. The accuracy and precision of the method were verified，and the technical method of one-time quantitative determination of major and minor elements in molybdenum concentrate by X-ray fluorescence spectrometry internal standard method was systematically established. The results show that the precision of this method for the determination of molybdenum，copper，iron，silicon，lead and calcium in molybdenum concentrate is 0.14%，2.39%，0.86%，0.47%，0.91% and 0.65%，respectively. The meth⁃ od is convenient and the test results are reliable.
    Practical Application of Reducing the Failure Rate of Medium and Long Distance Tailings Conveying System
    CAO Jun, FAN Liangliang, LIANG Chaojie
    2022, 38(09):  261. 
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    In order to solve the influence of the high failure rate of the system on the production con⁃ tinuity in the process of medium and long distance transportation of tailings, the fine tailings section of Gushan Mining Company has realized the long-term decline, some annual zero-fault operation through a se⁃ ries of technical transformation, equipment optimization, post skill improvement and information sharing of each post, provides a basic guarantee for the normal operation of the tailings system, and greatly alleviates the pressure of tailings transportation.
    Application of Divisional Controlled Blasting Technology in Reconstruction of Highway Tunnel under Complex Geological Conditions
    WANG Gang
    2022, 38(09):  264. 
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    In view of the tunnel reconstruction and reinforcement works under complex geological conditions such as loose surrounding rock，karst fissure development and mud filling in the karst cave，the original tunnel support shall be demolished in advance，and the area to be widened shall be expanded by blasting. Through careful design of the cutting mode and charging structure in the process of blasting exca⁃ vation，reasonable arrangement of hole positions，calculation of various blasting parameters by theoretical formulas and optimization and adjustment in combination with the actual situation on site，The blasting con⁃ struction shall be carried out in blocks，and the threshold of harmful effects such as blasting vibration， shock wave and flying stone shall be checked. Finally，it is determined that for the stable surrounding rock of the emergency parking zone，the hole depth of 1.5 m and above shall be used for excavation and con⁃ struction，and the whole section shall be blasted once; For the soft rock and fault fracture zone，it is appro⁃ priate to adopt weakening loosening blasting，or carry out the blasting construction of "multi cycle and short footage" step by step，with the cyclic footage not more than 1.0 m. For the area with good surrounding rock conditions for traffic and pedestrian cross tunnels，the designed blast hole depth is 1.5 m，and the cy⁃ clic footage is 0.95~1.35 m; The depth of blast holes in the surrounding rock soft area is 1.0 ~ 1.5 m，the cyclic footage is 0.8 ~ 1.2 m，and the surrounding holes are constructed by smooth blasting. The field blast⁃ ing results show that the rock fragmentation after blasting is uniform，the blasting footage reaches the de⁃ sign value，the surrounding rock is stable，and the harmful effects of blasting are effectively controlled，which provides a reference for similar tunnel blasting expansion projects.
    Geological Characteristics and Genesis Analysis of Laiwu Geothermal Field in Longtian Town， Longmen County，Guangdong Province
    LI Huaping
    2022, 38(09):  270. 
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    Longmen County，Guangdong Province is rich in geothermal resources. This work takes the Laiwu geothermal field in Longtian Town，Longmen County as an example，deepens the understanding of the geothermal geological conditions of the geothermal field through geothermal geological survey，geo⁃ thermal drilling engineering and temperature measurement，and preliminarily discusses the causes and prospecting prospects of the geothermal resources in the middle and deep layers of the geothermal field. Comprehensive analysis shows that Laiwu geothermal field is a hydrothermal geothermal system controlled by fault structure and lithology，and has good development potential.