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    25 August 2019, Volume 35 Issue 08
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    Mining Tourism Resources Development Status and Development Recommendations
    LI Yan-Chen, CAO Zhi-Min, GU Feng-Yu, XI Ming-Shuo
    2019, 35(08):  1-3. 
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    In order to effectively solve the problem of mine environment,promote economic transformation of resource-exhausted mining,realize the nonrenewable mining relics protection and permanent effective use of resources,shut down the mine mining tourism development is one of the important path.Six development patterns of mining industry tourism in China are summarized,there are six problems in the development of mining tourism in China such as the imperfect management system are discussed,besides that,combined with the mining tourism development successful experience both at home and abroad,ten related suggestions are proposed,so as to provide reliable reference for the related studies.
    Current Situation and Suggestion of Green Mine Construction in Chongqing
    ZHANG Sen, LI Ying-Jiao, TANG Ben-Feng, LONG Shi-Qing, ZHANG Hua-Ming, ZHANG Ling
    2019, 35(08):  4-8. 
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    The current situaon of green mine construction in Chongqing were analyzed and suggestions on further development of green mine construction and green mining industry were proposed in this paper.11 national green mine pilot projects have been declared from 2012 to 2014 in Chongqing,basic conditions and goals of green mine construction were formulated and established.By December 2018,21 green mines have been constructed and the third-party assessment has been completed.These proposals have been included in the list of green mines,and 60% of the mineral resources planning targets have been completed.At present,the scale structure of mining rights in Chongqing has been continuously optimized,and the level of intensive exploitation of mineral resources has been significantly improved.However,the proportion of small mines and below still reaches more than 60% and the productivity ratio is less than 40%.On this basis,to establish systematically green development strategy with regional characteristics of the main city,western,northeastern and southeastern Chongqing,to construct the green industrial chain,to form the green mine construction standard theory system,and to promote the implementation of "real gold,silver" incentive policy recommendations,have been put forward in this paper,which can be used to to promote the transformation and upgrading of mining industry and green development in Chongqing.
    Study on Problems and Solution Strategies of Green Mine Construction under New Normal Conditions
    YANG Bo
    2019, 35(08):  9-11. 
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    In order to build a better homeland,improve environmental quality and improve people's living standards,the state attaches more and more importance to environmental protection and requires more and more stringent.Under the new normal situation,a new concept of "green mine" is put forward for the sustainable development of mines,and actively promote the construction of green mines.The development of green mines is related to the rational allocation of mineral resources,the protection of ecological environment and the sustainable and harmonious development of China.Based on the analysis of the problems of green mine construction in China under the new normal conditions,puts forward three solutions to these problems:to strengthen the construction of green mine units,to further improve and upgrade the national standard system of green mine,and to formulate corresponding supporting policies for green mine construction.
    Discussion on Screening Method of Physical Geological Data of Copper Deposits in Anhui Province
    HUANG Ben-Zhu
    2019, 35(08):  15-17. 
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    As one of the dominant minerals in Anhui Province,the copper deposit ranks eighth in the total reserves of copper deposits in China,especially in Tongling area.The screening of physical geological data is discussed from the aspects of the basic situation of copper resources in Anhui Province and the screening principle of physical geological data,so as to provide reference for the collection agencies of physical geological data and some related study work in Anhui Province.
    Geological Features and Genesis of the Shenjiayao-Huluyu Gold Deposit in Western Henan Province
    SUO Yong, WANG Chun-Yong, GUO Fang-Fang
    2019, 35(08):  18-20. 
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    Shenjiayao-Huluyu gold deposit in Western Henan Province is a part of Xiaoshan Ag-Au polymetallic mineralizing belt,the metallogenic condidtions of the area is good.The ore-bearing rock layers of the mining area is mainly for Taihua Group.The important ore-controlling and ore-leading faults of the mining area are mainly for Xiao01 and Xiao09 faults,which direction is NNW.Based on analyzing the metallogenic geological background of the mining area and ore-body geological characteristics,the deposit genesis is discussed.The results show that the deposit genesis is a tectonic alteration rock type Au-polymetallic deposit．
    Geochemical Characteristics and Prospecting Prediction of No.B 12 Block in Kassala,Sudan
    CHEN Lin-Dong, GUAN Li-Jin, SU Sheng, WANG Fei, LIU Shi-Gang
    2019, 35(08):  21-23. 
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    The No.B12 block in Kassala,Sudan is one part of Nubian Shield,Au,Ag,Mo,Sn and Rare elements and radioactive elements are enriched in region major rock and stream sediments,variation characteristics of them is obvious.3 abnormal belts in the NW and NE directions are formed.Based on the analysis of regional geochemical characteristics,three prospective areas of Au、Ag、Mo、Sn,rare elements and radioactive elements are delineated and one medium gold polymetallic deposits and two each miniature non-ferrous,rare and radioactive deposits are found.
    Application of 3D Seismic Exploration Techniqque in the Prediction of Coal Seam Outcrop in a Mining Area of Xinjiang
    WANG Shu-Wei
    2019, 35(08):  24-26. 
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    In order to analyze the coal seam outcrop of some a mine area in Xinjiang,3D seismic exploration technique is used to forecast the coal seam outcrop.The field seismic data is acquired by using the advanced digital seismic equipment,the high-fold observation system is adopted to get field data with quality,based on the principle of "high signal to noise ratio,high resolution and high fidelity",the field high data is processed.According to the intersected position of unconformity between the reflection of coal floor and the bottom interface of Cenozoic,and combined with the seismic inversion section,the coal seam outcrop is predicted,and the prediction results is basically consistent with the drilling verification results.The study results indicated that is is feasible to prediction the coal seam outcrop by using 3D seismic exploration technique.
    Solution of Excavated Rock Drainage in Super-large Mine
    XIONG Xiao-Chen
    2019, 35(08):  48-51. 
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    Excavated rock is the main waste in a mine.Lilou Iron Mine has the characteristics of large amount of rock excavation,difficult rock drainage and high cost.Based on the current development and mining engineering and equipment and facilities in the mine,a feasible scheme of rock drainage is proposed.Trough analysis and comparison,three key schemes of 3# main system drainage,combined auxiliary well drainage and goaf drainage are obtained.Combined with the plan for the next three years,the advantages and disadvantages of the three schemes are compared.The rock drainage plan is determined,which is dominated by the drainage of empty area and supplemented by the drainage of auxiliary well and 3# main system.The implementation process is introduced in detail,and the drilling scheme of inclined chute (well),construction process,blasting parameters and design parameters for rock drainage truck blocking are discussed,so as to ensure the personnel and equipment working in safe areas and improve the safety of goaf rock drainage.Through goaf rock drainage,50.74 yuan/t can be increased,and the annual capital saving is close to 10 million yuan.The economic benefits are very obvious,and the occupation of surface land is also reduced,the social benefits are good,which can provide reference for similar super-large mines.
    Application of Screen Technology under Directional Long Hole Drilling in Roof
    SI Yuan-Long
    2019, 35(08):  52-54. 
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    In order to solve the problems of serious collapse of long-distance directional drilling holes,low concentration of gas extraction and low flow rate in the roof of Liyazhuang Coal Mine under complex geological conditions,According to the construction technology of high directional long borehole and gas drainage principle of coal seam roof,the technology of screen pipe protection under full borehole of directional long borehole in roof under complex geological conditions is studied.The integrated technology of "drilling-back drilling-small diameter through hole-large diameter reaming-back drilling-down sieve tube in hole-back drilling" has been formed,the related technical equipment and engineering practice are also introduced.Field application of typical complex Geological conditions roof in Liyazhuang Coal Mine shows that:through this technology,the screen can be quickly lowered to the full hole section under complex geological conditions,the depth of the screen is up to 459 meters,and the average gas extraction concentration and pure extraction quantity can be increased by about 5 times and 10 times respectively.
    Gas Extraction Technology of High Directional Long Borehole in Mining Fracture Zone
    MA Xiao-Min
    2019, 35(08):  55-57. 
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    To solve the problem of gas exceeding limit in upper corner caused by large gas emission in goaf of high gas fully mechanized mining face,the high directional long borehole gas extraction technology was proposed to control gas in goaf.The height of fracture zone in overlying rock strata during mining was calculated by numerical simulation,and reasonable parameters of directional long borehole extraction were designed.The field application results show that the gas extraction technology with high directional long borehole has high concentration,stable flow rate,long effective extraction time,and no gas overrun in upper corner occurs during the mining period.The gas extraction effect is remarkable,which ensures the safe and efficient production of the mine.
    Study on Gob-side Entry Retaining Technology along Slot in Coal Mine Face
    HAO Ming-Fei
    2019, 35(08):  55-57. 
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    In view of the outstanding safety problems and the low recovery rate of coal resources,this paper takes Bofang Coal Mine as the research background,puts forward the gob-side retaining roadway technology,realizes coal pillar-free mining,according to the actual situation of the mine,gives the relevant technical parameters of roof-cutting pressure relief and roadside support,and advances the anti-sliding stability of the gob-side retaining roadway wall.The analysis shows that the anti-sliding coefficient of the wall retained along the goaf is 5.4,which is greater than 1.6.Therefore,the wall meets the requirements of anti-sliding stability. The technology of Retaining Roadway along goaf in working face realizes Y-type ventilation,eliminates gas accumulation in upper corner of return air,improves mine safety conditions,reduces roadway driving rate,reduces empty roof operation,and reduces the probability of roof falling and side slope falling. Gob-side entry retaining technology can effectively improve the recovery rate of coal resources and the level of coal mine safety production,and ensure the national energy strategic security.
    Study on Roof Pressure Law of Shallow Fully Mechanized Mining Face
    BAO Hai-Sheng
    2019, 35(08):  61-64. 
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    The shallow depth of fully mechanized mining face in shallow coal seam is not conducive to the exploitation of coal seam and the stability of surrounding rock.In order to explore the roof pressure law of the fully mechanized mining face in Xinjing Mine.Based on the geology and mining conditions of the 8118 working face of the mine.The method of numerical simulation is used to analyze the roof collapse morphology,roof settlement and roof stress distribution in the fully mechanized mining face of shallow coal seam.At the same time,the working resistance of the bracket during the initial pressure and periodic pressure is monitored on site.The results show that during the initial pressure,the rock layers between the upper and lower key layers are separated,and the upper key layer is bent downward without breaking.The disturbance continues to pass upward during the period of pressure,and a large area of collapse occurs in the upper key layer.The working resistance of the pressure bracket has a large increase,which is about 61%.
    Curtain Grouting Technology for Horse Head dOOR of an Iron Mine Shaft
    ZANG Run-Cheng, ZANG Yun-Pei
    2019, 35(08):  80-82. 
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    An iron mine infrastructure shaft -50 m level horse head Door and roadway are located in the cement-bearing limestone-bearing limonite layer.Because there is a riverbed in the upper part of the ore layer,the river water and water-conducting faults enter the mining area,causing the construction to be interrupted.In order to prevent and control the fault water guide,through the site investigation,the horizontal head horse head door and part of the roadway were sealed by gushing water by curtain grouting technology,and the water belt was quickly passed.It has achieved good results and provided reference for the construction of similar projects.
    Flotation Technology Research of a Pb-Zn Polymetallic Ore in Guangxi
    WEI Zong-Wu, ZHANG Han, SHI Xing-Jun
    2019, 35(08):  86-89. 
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    There are many kinds of minerals in a lead-zinc polymetallic ore in Guangxi.The grade of Pb,Sb,Zn,S and Ag is 2.75%,2.33%,12.24%,28.27% and 96.08 g/t,respectively.It is belongs to a high-grade complex and refractory tin-associated polymetallic sulphide ore.In order to provide a basis for the determination of ore dressing process,the flotation process was studied.The technological process of prioity separation lead,and zinc flotation from lead tailings is determined.In lead flotation,zinc sulfate + sodium sulfite was used as combined inhibitor to drepress sphalerite,sulfuric acid as activator,LW-01 as collector,via one roughing two cleaning two scavenging jamesonite flotation.Lead tailings using lime + y-As as inhibitor to depress pyrite and arsenopyrite,copper sulfate as activator,butyl xanthate as collector,via one roughing two cleaning two scavenging zinc flotation.Through closed circuit test,the lead-antimony concentrate with lead grade 26.93%,antimony grade 23.35%,zinc grade 5.45%,silver grade 960 g/t,lead recovery 87.91%,antimony recovery 87.82%,silver recovery 86.98%,zinc concentrate with zinc grade 48.67% and zinc recovery 94.22% can be obtained.
    Preferential Flotation of West Orebody Copper Ore from Chambishi Mine
    LI Ming-Yang, CHEN Ze, GAO Xiang-Peng, WEI De-Zhou, GAO Ye
    2019, 35(08):  90-92. 
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    The mineral types of west orebody copper ore from Chambishi mine are numerous,and the content of Cu,Fe,S and Al2O3 is 1.69%,3.94%,1.61% and 14.70%,respectively,which belongs to high aluminum complex refractory copper ore.In order to provide the basis for the flotation technology of the ore,flotation tests were conducted.A preferential flotation flow which copper sulphide ore was floated firstly followed by copper oxide ore flotation was used through flotation test.Sodium silicate,CaO,butyl xanthate and 2# oil was used as the dispersant,depressant,collector and frother,respectively,in copper sulfide flotation.Sodium sulfide and butyl xanthate combined with butylamine dithiophosphate was used as the activator and collector,respectively,to float the copper oxide from tailings of copper sulfide flotation.Then the mixture of the rough concentrate of the copper sulfide flotation and the copper oxide flotation was processed by three cleaning operations with closed flowsheet.The final concentrate was obtained with copper grade 22.75% and recovery 71.89%,and a tailings with copper grade 0.49%.
    Flotation Experiment on an Arsenic-bearing High Sulfur Microfine Antimony Ore from Xinjiang
    ZHANG Han, WEI Zong-Wu, YANG Mei-Jin, SHI Xing-Jun
    2019, 35(08):  93-96. 
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    There is 2.43% Sb in a stibnite ore in Xinjiang.Antimony mainly exists in cracks of arsenopyrite,pyrite and pyrrhotite in fine and microfine particles.Gangue minerals are mainly quartz,calcium-magnesium minerals and a small amount of aluminosilicate.To provide technique basis for development and utilization of the ore,beneficiation experiment was conducted.Results indicated that,at the grinding fineness of -0.074 mm accounting for 90%,pH value of 6.5 by sulfuric acid,TS-1 is used as sulfur-arsenic mineral inhibitor,lead nitrate as antimony activator,ethyl thio carbamate+butyl amine as collector via one roughing two cleaning three scavenging closed circuit flotation,antimony concentrate with antimony grade of 49.95% and recovery of 95.47% was obtained.The test results can provide reference for the rational development of the ore.
    Influence of Sodium Hydroxide and Sodium Carbonate in Spodumene Flotation
    WANG Xiang-Kun, GAO Yu-De, 吕Hao-Zi , MENG Qing-Bo
    2019, 35(08):  97-100. 
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    Using lithium ore from Gajika in Sichuan Province as research object to separate the lithium concentrate by flotation.The effects of adding order,action time and dosage of sodium hydroxide and sodium carbonate,which are the regulators in the lithium flotation,are mainly investigated.Adding sodium carbonate before sodium hydroxide,the Li2O grade of lithium concentrates are improved significantly.Properly extending the action time of sodium hydroxide,the Li2O recovery of lithium concentrate are effectively increased.The high dosage of sodium carbonate depressed the floatability of spodumene.The high dosage of sodium hydroxide decreased the selectivity of spodumene collectors.The ore via two roughing three cleaning one scavenging closed circuit flotation process,lithium concentrate with Li2O grade of4.48% and recovery of 87.76% can be obtained.
    Experimental Study on a Molybdenum-bismuth Polymetallic Ore in Hunan Province
    ZHANG Ming-Wei
    2019, 35(08):  101-105. 
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    A polymetallic ore in Hunan contains 0.07% molybdenum and 0.17% bismuth. The molybdenum in the ore mainly exists in the form of molybdenum sulfide,accounting for 95.04%,the bismuth mainly exists in the form of bismuth sulfide,accounting for 68.42%,followed by natural bismuth,accounting for 21.64%.In order to determine the reasonable recovery processing of ore ,beneficiation test was carried out.The results show that,at grinding fineness of -0.074 mm accounting for 90%,with sodium silicate as inhibitor and BK205 as collector,via one roughing three cleaning two scavenging Mo-Bi iso flotability flotation,Mo-Bi mixed concentrate via one roughing four cleaning two scavenging flotation separation of molybdenum and bismuth using sodium sulfide as inhibitor,sodium silicate as dispersing agent,kerosene as collector,molybdenum rough concentrate using sulfuric acid as the pH adjuster,sodium silicate as the dispersing agent,SN- 9 as collector via one roughing two cleaning two scavenging desiliconized flotation.Molybdenum concentrate with Mo grade of 48.22%,and recovery of 81.07%,desiliconized bismuth concentrate with Bi grade of 52.12% and recovery of 58.37%,bismuth middling with Bi grade of 2.62% and recovery of 3.23% was obtained.
    Tungsten Separation Experiment in the Separation Tailings of Tungsten,Molybdenum,Bismuth and Fluorite Complex Polymetallic Ore
    ZHU Tao
    2019, 35(08):  106-110. 
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    By low intensity magnetic separation-wolframite and scheelite mixed flotation- wolframite and scheelite separation flotation-scheelite cleaning flotation-wolframite shaking table gravity separation-wolfframite fine mud flotation process for tungsten separation from tungsten,molybdenum,bismuth,fluorite complex polymetallic ore of sulphide flotation tailings,scheelite concentrate can be obtained by 68.79% WO3,the recovery rate of 53.27%,wolframite tungsten concentrate with WO3 grade of 52.49%,the recovery rate of 17.57%,the total tungsten recovery rate of 70.84% technology indicators was obtained.It is also pointed out that acid leaching of scheelite concentrate can remove phosphorus and remove calcite and other impurities,and the grade of scheelite concentrate increased by 2.46 percentage points.
    Process Mineralogy Study on Iron Ore of Liusi in Huoqiu County,Anhui Province
    LU Jing, WANG Feng, LI Lei, YUAN Xiao-Ling, ZHANG Qing
    2019, 35(08):  112-115. 
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    Iron is the main valuable element in Liusi iron ore in Huoqiu County,Anhui Province.Fe mainly exists in magnetite inⅠorebody.And inⅡorebody Fe mainly exists in magnetite and specularite(hematite).The mineral structure of ore is mainly semi-idiomorphic granular metamorphic structure,allotriomorphic granular metamorphic structure,lamellar metamorphic structure,columnar metamorphic structure,coedge-metamorphic structure and inclusions.Ore structure mainly striation structure,striation structure and striation strip structure.Magnetite inⅠorebody dissemination particle size concentrated distribution in 0.075~1.2 mm.And inⅡorebody magnetite dissemination particle size concentrated distribution in 0.075 ~ 0.6 mm;specularite dissemination particle size concentrated distribution in +0.15 mm;hematite dissemination particle size concentrated distribution in -0.075 mm.It is difficult to obtain pure target minerals by gravity separation,and pure magnetite products can be obtained by magnetic separation.The impurities mainly include amphibole minerals containing magnetite inclusions and epiphytes.High intensity magnetic separation has less mineral loss but more impurities.
    Beneficiation Test of a Low Grade Iron Ore
    HU Yang, ZHANG Meng-Yu, CHEN Fei, LIU Jia-Yi
    2019, 35(08):  116-119. 
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    The iron grade of the extremely poor iron ore used in the test is 13.90%,the harmful element phosphorus content is 0.86%,and the magnetic iron accounts for 46.04% of the total iron,mainly in the form of maghemite and magnetite,maghemite and magnet.The ore is dominated by a semi-self-morphing crystal structure with an inlaid grain size of more than 75% greater than 0.1 mm,and about 5% of the maghemite has a size of less than 0.05 mm.In order to determine the development and utilization process of the ore,a mineral processing experiment was conducted.The results show that the ore is treated by three-stage grinding process: the first stage grinding fineness is -0.076 mm 38.5%,the magnetic field intensity of low intensity magnetic separation is 115 kA/m,the second stage grinding fineness is -0.076 mm 74%,the magnetic field intensity of low intensity magnetic separation is 115 kA/m,the third stage grinding fineness is -0.043 mm 92%,and the magnetic field intensity of low intensity magnetic separation is 115 kA/m.Iron concentrate with 60.12% iron grade and 40.22% iron recovery was obtained.The sulphur and phosphorus content of iron concentrate is low,which meets the requirements of product quality.
    Study on Air Distribution and Suspension Characteristics of High Concentration Flotation
    HAN Zhi-Bin, ZHANG Yue-Jun, WU Feng, CHEN Fei-Fei
    2019, 35(08):  120-122. 
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    Flotation is one of the important beneficiation methods,and the slurry concentration is an important parameter in the flotation process.High concentration flotation technology can reduce the consumption of water and reagents,increase the equipment processing capacity and flotation rate.It's important to study high concentration flotation.The concentration of rougher Ⅰ and rougher Ⅱ in a rare earth site which with the ore specific gravity 3.6 g/cm3,is 57% and 51% respectively,and it can be considered as a typical high concentration flotation.The air distribution and slurry suspension characteristic of the two JJF-24 flotation cells of rougher Ⅰ and rougher Ⅱ were measured.The results show that the surface air dispersion can reach 3.8,while the longitudinal section air dispersion can reach 2.9,which means the air in the flotation cell is well distributed.The slurry in the cells is not suspension uniformly and a significant stratification at different depth sections appears.As the depth of the longitudinal section increases,the relationship between air distribution and slurry concentration shows a certain correlation.Further research can be conducted to find the relationship between stratification and air distribution in high concentration slurry,and to know how the two factors impact on the flotation indicators.
    Application of Neural Network Technology in Mineral Processing Industry
    LI Chao, SHANG Yan-Bo, ZHU Yang-Ge, LUO Ke-Hua, YANG Guang
    2019, 35(08):  123-126. 
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    Neural network technology is a new data mining method,which has many advantages such as multi-objective,strong fitting,self-adaptation and so on.The mineral processing process involves a long process and many steps,and involves complex physical and chemical processes.It is difficult to establish an accurate mathematical model.At present,the application of neural network technology in various technological steps of mineral processing has achieved some research results.In the future,there will be wide application prospects in the fields of automation of mineral processing,research on fault diagnosis expert system for mineral processing equipment,and the relationship between reagents and mineral processing effect.
    Experiment on Stage Grinding Stage Magnetic Separation of Iron Increase and Silicon Decrease of the Oolitic Hematite Ore with High Silica
    WANG She-Guang, TU Guang-Fu
    2019, 35(08):  127-128. 
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    There is 47.44% iron in an oolitic hematite from the Middle East.Iron mainly exist in form of magnetite,distribution rate of iron in magnetite is 60.26%.To provide technique basis for development and utilization of the ore,stage grinding stage magnetic separation process was conducted in the experiment.The result shows that at the first stage grinding fineness of 80.8% passing 0.074 mm,first magnetic separation magnetic field intensity of 0.12 T,second stage grinding fineness of 93.3% passing 0.074 mm,second magnetic separation magnetic field intensity of 0.8 T,third stage grinding fineness of 95.2% passing 0.074 mm,third magnetic separation magnetic field intensity of 0.4 T,iron concentrate with iron grade of 61.02% and recovery of 53.25% was obtained.The separation and enrichment of iron and impurity minerals can be effectively realized.
    Design on the Two-level Access Control System of Mine Dangerous Area
    FAN Xue-Feng, TANG Jian-Song, XU Chun-Geng
    2019, 35(08):  144-146. 
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    The dangerous area of underground mines have complicated working conditions and scattered personnel,which often lead to accidents due to the unauthorized intrusion of unrelated personnel and the failure to timely deal with them.In order to improve the intelligent level of dangerous area management and solve the problem of personnel control in dangerous area,based on the field investigation and demand of a mine,through the establishment of access control system workflow and overall topology relationship model,the overall scheme of the system is designed.Through the reasonable distribution and installation of the function modules,the integration of the function modules of the access control system is realized.Through the analysis of the existing network structure,the system communication local area network is built on the original network structure.Through the correlation between downhole management software and downhole dispatching center,a complete downhole and downhole two-level monitoring and management system is constructed.The access control system is tested in an iron mine in Anhui Province for two months.The results show that the overall function of the system is reliable and stable,the on-site feedback results is good.
    Hydraulic hammer,Fluidic|Jet suction type|Double-action|Valve control|Simulation
    TANG Da-Yong
    2019, 35(08):  147-150. 
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    According to the low efficiency of the traditional jet and suction hydraulic hammer in the construction of near horizontal or upward hole in hard rock,according to the working principal of ordinary hydraulic hammer,a valve controlled double-action hydraulic hammer is designed.Based on the structural characteristics of hydraulic hammer and Newton's second law,the dynamic model of piston of hydraulic hammer is established.The M file of Matlab software is complied,and the starting performance of the piston of hydraulic hammer in the backstroke and stroke stages is simulated and analyzed.Φ89 mm hydraulic hammer prototype is developed,laboratory and downhole industrial test are done,the hydraulic hammer impact performance and design rationality are verified,which can provide an effective method for the construction of near-horizontal hole or upward hole in underground coal mine and hard rock stratum of tunnel.Besides that,it is found that the valve distribution element of hydraulic hammer is prone to scratch,deformation and other rapid wear problems,which provides a new direction for the reliability study of hydraulic hammer.
    Present Situation and Discussion on Application of Iron Remover in Mine
    TAN Wen-Cai, LIU Jun, TIAN Zhen-Hua, CHEN Chong
    2019, 35(08):  151-153. 
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    For the process of crushing in mines,in order to prevent metal from entering the equipment and causing damage to it,the iron remover is used to remove the metal.The current methods of iron removal in mines and existing problems are discussed,and the future development direction of iron separators is prospected.At present,non-magnetic mines mainly remove iron by iron remover,and then detect by metal detectors.If metal is not removed,the machine will be shut down manually.The magnetic ore is mainly detected by metal detectors,and the electromagnetic iron remover ex-magnetizes and removes iron.This method has many problems in mine application of which with high iron removal requirements.At present,some magnetic mines have been improved,using metal detector+electric three.Although the above iron removal method is widely used in mines,there are various disadvantages.In the future,new intelligent high-difference iron removal equipment and new principle iron removal equipment should be developed to meet various complex conditions of iron removal.
    Research on Technology and Structure of Magnetic Assembly Fixture of a New Magnetic Separator
    CAI Zhi-Yong, CHENG Lei, ZENG Hui, SHANG Hong-Liang
    2019, 35(08):  154-156. 
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    Analyses the magnetic system of a new magnetic separator,in view of the magnetic system arrangement character of the magnetic needle of the new magnetic separator,it was compared with the traditional assembly method,the practical assembly method was given.A convenient and practical tools for plugging pole was designed,the structure and kinematics analysis was conducted.On the basis of guarantee the technical performance of the magnetic system,make the assembly easier,reduce labor intensity and reduce the assembly of magnetic system of production accidents,so as to improve the production efficiency.
    Safety Evaluation and Countermeasures of the Open-pit Mning under the Goaf Occurrence
    SHI Fa-Wu, XIAO Yun-Tao, YAO Gao-Hui, CAO Hui
    2019, 35(08):  176-180. 
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    Taking Balubadong Open-pit Mine as the study example,combined with site reconnaissance and production technical data,three-dimensional models of surface,goaf and ore-body are established based on 3DMine software.According to the goaf theoretical deduce and borehole detection results,the actual occurrence situation of the goaf is obtained,besides that,division of potential dangerous area,analysis and evaluation of slope stability characteristics and isolation thickness is done,besides that,the safety guarantee measures of open-pit mining operation are proposed,so as to ensure the safety production of the mine.
    Research on Reliability of Open-pit Mine Coal Transportation System Based on Fault Tree Analysis Method
    HAN Wan-Dong, TIAN Xian-Bao
    2019, 35(08):  181-184. 
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    Through the fault tree analysis method,the fault factors of semi-continuous coal handling system in open pit mine are systematically analyzed.The accident tree of semi-continuous coal handling system in open pit mine is established.The minimum cut set and minimum path set are simplified by using Boolean algebra method to simplify the fault tree,preliminary qualitative analysis.Combined with the actual production data of the mine,quantitative analysis is carried out from the two aspects of probability importance and critical importance.The factors are analyzed and compared,and the main factors of each influencing factor are pointed out.The failure rate of semi-continuous coal transportation system is obtained.The proposed measures are conducive to system stability.
    Study and Application of Goaf Passing Technology in Fully Mechanized Working face of Liuta Coal Mine
    SUN Zhan-Peng, CHEN Chuan, GUAN Rui-Chong, LIANG Xu-Chao, CHEN An-Min
    2019, 35(08):  185-187. 
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    In order to realize the goal of safe and efficient recovery of coal resources,goaf passing technology is adopted in 12113-2 fully mechanized working face of Liuta Mine,after opening the empty roadway,the reinforcement supporting method is used by using roof cable,roadway bolt,wood point,pile and mesh,besides that the detection method of top and bottom coal and roof preinjection polymer materials are applied,the safety of roadway roof is guaranteed and safety production during passing empty roadway is ensured.Based on the above discussion results,the safety guarantee technology when passing the empty roadway is proposed.Huge economic benefit is created by making good preparations before passing the empty roadway and reasonably determining the coal cutting technology during the period of passing the empty roadway,which can provide technical support and experience reference for the safe and fast passage through the empty roadway of the working face with similar conditions.
    Application Practice of 3DMine Modeling Technique in Safe Operation of the Tailings Reservoir of a Mine
    LI Ke-Lin
    2019, 35(08):  188-190. 
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    Tailings reservoir is a major hazard source for mining enterprises.Its safe operation status is related to the normal operation of downstream enterprises and the protection of surrounding ecological environment.In order to control the safe operation of tailings reservoir quickly,it is necessary to monitor the changes of dam body regularly and analyze the latest trends.Based on 3D mine software,a three-dimensional model of the tailings reservoir of a mine is established,so as to simulate the actual situation of dam body change analysis and comparison.The application results is good,the 3DMine modeling technique is help for guiding the safe operation of the dam body of tailings reservoir of the mine.
    Study on Influence of Surrounding Rock Failure on Semi-circular Arch Roadway with Thick Wall and Thick Wall
    LIU Chao-Wei
    2019, 35(08):  191-193. 
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    Using FLAC3D numerical simulation as the main method, the influence of plastic zone development characteristics,stress distribution characteristics and deformation characteristics of surrounding rock in the surrounding rocks of the straight wall of thick coal seam with different buried depth and different lateral pressure coefficients is analyzed.The results show that with the increase of buried depth,the deformation of surrounding rock of roadway increases linearly,the damage depth of surrounding rock is larger and the plastic region is surrounded by shape,and the lateral pressure coefficient has a great influence on the failure form of roadway,and when the lateral pressure coefficient is 0.5,the distribution of plastic zone shows "butterfly Wing shape 1 o'clock",the plastic zone distribution is "sailing shape",the distribution is more uniform,and the lateral pressure coefficient continues to increase,the roadway gradually becomes "narrow high shape" and finally develops into "hourglass shape".The support scheme of the return air lane of the fish truck mine is optimized,the joint support of the anchor net cable is used,and the surface of the roadway is sprayed,the roof sinking is 35 mm after the roadway is stabilized,and the shift of the help area is 50mm,which satisfies the need of normal safe production.
    Destruction Characteristics and Control Technology of Surrounding Rocks inMining Roads of Shenjiao Mine
    CHAI Shi-Yan, GUO Ming-Xu, CHANG Wei-Feng
    2019, 35(08):  194-196. 
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    Taking Shenjiao Mine as the engineering background,based on the on-site monitoring of the damage pattern of 2# coal seam roadway,in order to control the formation and development of the surrounding plastic zone of the roadway,the FLAC3D numerical simulation method is used to analyze the different distribution patterns of the plastic zone shape of the roadway under different angle deflections of the main stress around the roadway.According to the deformation and failure mode of the main road affected by the mining face and the service content and age of the later alley,the design of the renovation of the main road is carried out,and the designed renovation plan is applied for engineering,good results is obtained,which can provide reliable reference for the similar mines.
    Study on Mechanism and Control Measures of Central Landslide in the Lower Plate of Nanfen Open-pit Mine
    FU Guo-Long
    2019, 35(08):  197-198. 
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    As open pit mines enter deep dip mining,slope stability issues have been an important factor plaguing open air production.The analysis of the central landslide in the lower part of the Nanfen open-pit mine is carried out,and the reasons for the landslide are obtained and the treatment measures are put forward to ensure the safety and stability of the slope and achieve the safe and orderly expansion of production.
    Optimization of Large Diameter Pressure Relief Borehole Depth in Impact Dangerous Working Face
    ZHANG Yong-Dong, ZHU Ya-Wei, ZHANG Heng
    2019, 35(08):  199-201. 
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    Based on the geological conditions of Yuejin Coal Mine 25110 working face,the optimization model of pressure relief depth of large diameter boreholes is established by using FLAC2D numerical simulation software.Combining with the theory of energy propagation attenuation,the expression of impact risk index after pressure relief of boreholes is obtained.The pressure relief effect of large diameter pressure relief boreholes with different depths is analyzed and compared under certain parameters.The simulation results show that when the depth of large diameter pressure relief hole in 110 working face is 45 m,the impact risk index is the smallest and the pressure relief effect is the most obvious.