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    25 April 2019, Volume 35 Issue 04
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    Discussion on the Construction of Quanjiao Digital and Intelligent Mine in CONCH
    HE Shen-Zhong, WANG Liu-Jun, BI Lin, CHEN Xin, LI Cheng-Sheng
    2019, 35(04):  1-5. 
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    In order to promote the construction of digital intelligent mine in cement industry and improve the level of mine management,this paper focuses on the background of digital intelligent Mine Construction,discusses the overall project of the construction of the Quanjiao Digital Intelligent mine of CONCH Group,constructs the content,the construction effect and the strategy analysis,completes the mine data center,digital mining software platform,production execution system platform and three—dimensional visual control platform,the formation of "a center+three platform" of the complete digital intelligent mine construction collaborative platform can greatly improve the management level,improve production efficiency,and reduce the operating costs of enterprises.Meanwhile,it provides reference for the construction of digital intelligent mine in other mine enterprises.
    Deposit Genesis and Metallogenic Regularity of Yangla Copper Deposit in Western Yunnan Province
    LU Ji-Jun, LI Ying, ZI Hong-Mei
    2019, 35(04):  19-23. 
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    Yangla Copper Deposit is located in the binding site of Changdu—Simao Block and Zhongzan Block,which is one of the representative deposits in Yangla—Qulong Cu (Pb—Zn—Ag) metallogenic belt of Jiaren granite belt.In order to provide some reliable references for the deep and edge prospecting work of the mining area,based on the geological research results for the mining area,the regional metallogenic geological background,deposit geological characteristics,metallogenic factors,genetic mechanism and the relationship between formation lithology,structure,magmatic activity and mineralization are discussed.The research results show that:①the strata distributed in the mining area is mainly for Silurian System and Nipen System,among them,Jiangbian Formation and Linong Formation of Silurian are the enriched strata;②the deposit is mainly controlled by strata and tectonic,the whole scale,occurrence and thickness of the deposit vary greatly,the mineralization form is complex and changeable along the tending direction,which occurred as layered stratiform—like and lenticular;③the deposit is mainly controlled by the SN trend faults,NE trend faults and interlayer fracture zone,and the mineralization is enriched in the intersection part of structure;④the mineralization of deposit can be divided into hydrothermal sedimentation,magmatic hydrothermal and tectonic hydrothermal transformation,therefore,the genesis of the copper deposit is defined as hydrothermal sedimentary—hydrothermal reformed deposit.According to the above discussion results,it is further indicated that the west side of Linong ore—section,east side of Lunong ore—section and the combining site have favorable prospecting potential.
    Genesis and Prospecting Criteria of Tiechang Ti—Fe Placer Deposit in Luquan County,Yunnan Province
    LEI Gang, JIANG Jin-Fang
    2019, 35(04):  24-27. 
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    Tiechang Ti—Fe Placer Deposit is located in Luquan fault—concave of Yangtze Para—platform,which is characterized by superior metallogenic condition,favorable exploration and low exploration degree.Through detail analysis of the geological working results of area and deposit,the regional metallogenic geological background,geological characteristics of the mining area and the deposit are summarized,besides that,the prospecting criteria is also discussed.The research results show that:①Ordovician,Cambrian and residual/slope of sediments of Quaternary are occurred in the mining area,the residual and slope of sediments of Quaternary is the mainly ore—hosting strata,which lithology are mainly for clayey silt,gravel soil and sand soil of diabase;②affected by the regional tectonics activities,the mining area is characterized by fault development,and the alar part and the center part have closely related to the mineralization;③the orebodies (mineralization) are mainly occurred in the flat area with diabase rock mass,which is strictly controlled by rockmass,there is a positive correlation between the sale of orebodies and the thickness of weathered crust;④Tiechang Ti—Fe Placer Deposit belongs to the residual/slope sediments weathering—crust type deposit,the outcrop of placer mineral (titanium placer,magnetite),bleaching—sand and the mechanical halo dispersion can be regarded as favorable prospecting criterias for finding the placer,and gently hillside,erosive platform and erosive terrace are the favorable destribution positions for rich deposit.
    Uranium Metallogenic Geological Conditions and Metallogenic Potential in Xingning Basin and Its Periphery in Guangdong Province
    LONG Zi-Qiang, LI Zhong-Shu, RUAN Kun, HU Peng, LI Yang, ZHANG Feng
    2019, 35(04):  28-32. 
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    Xingning Basin is located in intersection area of NE direction Shaowu—Heyuan fault zone and Wuhua fault zone,the uranium metallogenic potential of the area is good,the metallogenic conditions such as strata,magmatic rock,geophysical and geochemical conditions are favorable,the metallogenic tectonic environment of the area is good,besides that,the uranium ore and anomalies are well developed in the area.Combing with the geological results of the area,the metallogenic geological conditions and metallogenic potential of the basin and its periphery are discussed.The results show that the developed locations of the secondary silicified zone or the diabase zone along the regional deep faults,especially for the intersection area that the silicified zone and intermediate—basic veins,and the superposition area of silication,hematitization,secondary uranium mineralization and various geophysical and geochemical anomalies are favorable areas for uranium metallogenic.
    Comparative Analysis of Geological and Metallogenic Conditions between Tuanyuan Silver—Gold Anomaly Area and Weishancheng Polymetallic Metallogenic Belt
    LIU Jun-Tao, JIA Xiu-Ge, LI Cai-Xia, LIU Ling-Yu
    2019, 35(04):  33-37. 
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    In order to study the prospecting direction of Tuanyuan silver—gold anomaly area,the occurrence characteristics and metallogenic process of Yindongpo silver—gold deposit in Weishancheng ploymetallic metallogenic belt is analyzed,and compares them with that of Tuanyuan silver—gold anomaly area.The study results show that the metallogenic conditions of them are similar with each other,they are may by belongs to the same metallogenic system,prospecting results of them can be shared with each other.
    Metallogenic Mechanism and Geological Characteristics of Maozu Lead—zinc Deposit in Northeast Yunnan Province
    PENG Yi, WU Yun-Hui
    2019, 35(04):  38-41. 
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    Maozu Lead—zinc Deposit is located in the eastern margin of Western Yangtze Para—platform,which is a large deposit of northeast Yunnan ore—concentrating area in Sichuan—Yunnan—Guizhou Pb—Zn metallogenic province.Based on the previous study results,the metallogenic geological background geological characteristics of the deposit,the ore—occurred strata are analyzed,the metallogenic regularity is discussed,besides that,the deposit mechanism is studied.The study results show that:①Maozu mining area has inherited the regional geological characteristics,the outcrop layer is abundant,the orebodies (mineralized bodies) are occurred in Dengying Formation of Upper Sinian,and the ore—bearing rock is dolomite;②the tectonic framework of the mining area is complex,orebodies are strictly controlled by north—east structures,the secondary faults have enrichment effect on mineralization;③the deposit developed three kinds of orebody (mineralization),including stratiform—like orebody,vein orebody and irregular orebody,the stratiform—like orebody has occurred in axis/alar part,which characterized by stable occurrence,regular morphology and thick—large scale,and the orebody has occurred anticlinal shafts/wings;④the ore—hosting strata,surrounding rock lithology,fold structure and secondary tectonic (plumose fractures) are the significant ore—controlling factors,which proved that Maozu Lead—zinc Deposit belongs to the trinity hydrothermal—sedimentary type deposit.
    Genesis and Metallgenic Regularity of Manlonggou Gold Deposit in Xichou County,Southeast Yunnan Province
    TANG Kun, FENG Zhi-Hong, LIU Ming-Jiang, YU Can
    2019, 35(04):  42-45. 
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    Manlonggou Gold Deposit in Southwest Yunnan Province is located in Xichou arch—concave of Wenshan—Fining folded belt,it belongs to the one that is mainly in close relations with unconformity surface of Caledonian.Based on the regional metalogenic geological background and geological working results of mining area,the geological characteristics of deposit are discussed,the metallgenic law is summarized,besides that,the prospecting direction of the mining area is studied based on the ground engineering verification results and pit drilling engineering verification results.The research results show that:①the ore—guiding structures and ore—hosting structures in the mining area are well developed and characterized by multilevel,consistency and inheritance,and the occurrence and spatial distribution is strictly controlled by Dabao gliding—nappe,the SN—trending fractures and NWW—trending fracture have close relationship with gold mineralization;②the mineralization of Manlonggou Deposit is strictly controlled by tectonic activity,which characterized by strata—bound type,it belongs to the one that carlin—type hydrothermal deposit in Southeast Yunnan Province;③the strong wall—rock alteration (silicification,pyritized and arsenopuritization) and unconformity surface are the favorable prospecting criterias,and the gold ore seam which exposed by surface of gliding—nappe can be ragarded as the favorable position of rich gold orebodies.
    Geological Characteristics and Prospecting Criteria of Hongshan Copper Deposit in Northwest Yunnan Province
    FENG Zhi-Hong, LIU Ming-Jiang, TANG Kun, A Pin
    2019, 35(04):  46-48. 
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    Hongshan Copper—polymetallic Deposit is a large polymetallic deposit in Zhongdian Hongshan—Xuejiping polymetallic metallogenic belt in Northwest Yunnan Province.The mining area is experienced a long and complex tectonic—magmatic activity,which is characterized by the superior metallogenic geological conditions.The geological characteristics of the mining area and deposit are discussed,the deposit genesis and prospecting criteria are analyzed.The research results show that:①the mining area is mainly occurred limestone and intermediate—acid volcanic rock in Qugasi Formation and Tumugou Formation,and the orebodies are mainly hosted in the transition—layer of carbonate;②structure of the mining area is well developed,the interlayer fractured—zone and tectonic breccia fractured—zone in the contract zone between hornstone and skarn are the favorable ore—bearing position;③the skarn—type copper orebodies (mineralization) are occurred with layered and stratiform—like,which are characterized by steady occurrence and uniform mineralization,the molybdenum orebodies are occurred in quartz diorite porphyrite and adamellite,which are characterized by varied thickness and low grade;④the skarn—type copper orebodies have developed in Indo—Chinese Epoch,and enriched by hydrothermal ore—forming with molybdenun in Yanshanian,the genesis of Hongshan porphyry—skarn type deposit can be attributed to hydrothermal superimposed reformation;⑤the surface occurrence,intrusive rock,structures,geophysical geochemical anomaly and mineralization can be taken as the favorable prospecting Criteria in Hongshan mining area.
    Relationship between Typical Natural Hot Spring Geothermal Fluid and Groundwater in Jiaodong Peninsula
    ZHANG Jie, ZHAO Han, SHI Meng, YUAN Fang, YIN Tao, YANG Wan-Qiu
    2019, 35(04):  49-51. 
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    In order to understand the relationship between typical natural hot spring geothermal fluid and groundwater in Jiaodong Peninsula,the chemical characteristics of hot spring water,Quaternary (shallow well) water and bedrock water are analyzed comprehensively.The contents of δ18O and δD in hot spring water are measured.The relationship between typical natural hot spring geothermal fluid and groundwater in Jiaodong Peninsula is analyzed by using Yantai rainline equation.The results show that the hydrochemical types of hot springs in the study area are Cl—Na、Cl—Na·Ca、SO4·HCO3—Na、HCO3·SO4—Na and SO4·Cl—Na types,the natural hot spring geothermal fluid has no hydraulic connection with the regional groundwater near the hot spring,the geothermal fluids of hot springs come from infiltration recharge of atmospheric rainfall.
    Improvement Measures of Pre—spliting Blasting Quality of The East Boundary of the Stope of Shuichang Iron Mine
    WANG Chao-Hui, YIN Zhi-Zu, CHEN Jian-Hua, WANG Ai-Min, GUAN Xiao-Feng
    2019, 35(04):  56-60. 
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    The geological conditions of the east boundary of the stope of Shuichang Iron Mine is complex,the joint sand fissures are well developed,the pre—spliting blasting quality of the boundary is influenced.Through investigation and analysis of the influence factors of drilling quality and blasting design,the improvement measures are proposed.The blasting quality can be improved by increasing the hole diameter of pre—spliting blasting appropriately,controlling the overdepth of the main horizontal buffer hole reasonably,sub—level drainage pre—spliting blasting,retaining 1~2 empty holes at each end of the pre—spliting blasting area without blasting,cleaning slag blasting and increasing the amount of pre—spliting blasting charge appropriately and reducing the charge of buffer blasting.The results show that half porosity of pre—spliting blasting of L8 drilling machine with 150 mm diameter can be improved to more than 70%,the maximum value is 85％,compared with F9 drilling machine,the hole depth qualified rate,angle qualified rate and half hole rate of the areas with complex geological condition of L8 drilling machine is improved by 10%,7% and 20% respectively,the average half porosity is 65％,the whole blasting quality is improved effectively,the mining cost is reduced significantly,the above study experience can provide some reference for the similar mines.
    Layout Optimization of the Large Production System of "Three Soft" Coal Seam Working Face with Large Dip Angle
    DI Hai-Tao
    2019, 35(04):  61-64. 
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    According to the document spirit of "three excellent,three reduction and three improvement" and guidance principle of safe and efficient production of Henan Energy Group,combined with the actual situation of the 35 and 37 mining areas,through scheme selection,the optimal optimization consolidation scheme of mining area is determined,so as to optimize the layout of working face of three sections.After the layout of the production system,a set of production system is shared,large quantity of roadway excavation engineering is reduced.Floor rock concentration roadway cannot be set,the gateway of coal seam excavation working face can be entered directly,the layout of roadway of mining area is optimized,the lower roadway of working face can be excavated directly,the series ventilation problem is solved effectively.When preparing the coal mining face,three working face can be reduced,the installation and removal work of three working face can be eliminated.The triangle coal in the middle area can be recovered when the working face is pushed from the west wing to the east wing,the working face coal recovery rate is improved,the mine production is increased,about 3 million yuan economic benefits can be increased of single working face.Ideal benefits is obtained by the optimization of production system,it can be used to 33 and 36 mining areas in Yiluo Coal Company,so as to realize the goal of saving cost,increasing production and efficiency and intensive production.
    Development Status and Study Direction of Coal Pillarless Mining Technology
    FENG Min
    2019, 35(04):  65-69. 
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    The application characteristics of coalless pillar mining technology is discussed,the development history and current situation of coal mining technology in the Unite Kindem,Canada,South Africa and China are summarized,and the problem of coalless pillar mining existed in our county is analyzed.The results show that:cost of the filling materials and equipment of rock and air retaining lane is high,the traditional rock—stay roadway theory does not match the surrounding rock control requirements,and the design theory of roadway retaining support is not perfect;the position and size theory of leaving coal pillars in rock—air roadway is not perfect,and support technology and methods for controlling deformation and destruction of surrounding rock cannot fully meet the development needs of modern coal mines.Combined with the current problems of surrounding rock control theory and support technology,the future development direction and prospects of surrounding rock control technology for rock roadway and rock roadway are presented,so as to provide some reliable reference for the corresponding study work.
    Study on the Reasonable Width of the End Coal Pillars of Compound Mining Coal Seam
    LU Jun
    2019, 35(04):  70-73. 
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    In order to optimize the width of coal pillar,improve the coal production rate of mining area and ensure the mining speed of working face,combined with the actual mining conditions of 2—106 working face of Xuehugou Coal Mine,the combination method of theoretical analysis and numerical simulation is proposed to study the reasonable width of roadway production coal pillar of 2—106B working face.Through limit equilibrium calculation,the reasonable wide of coal pillar should not be less than 20.32 m.By numerical simulation analysis,the surrounding rock deformation characteristics under the width conditions of 25,22,20,15,10 m of the protection coal pillars are analyzed,the results show that when the width of coal pillar is 22 m,the concentrated vertical stress in coal pillar gradually transits to distribution shape of the stable asymmetric arch,certain shear failure and tension failure are produced in both sides of coal pillar,but the scope of the area has not been expanded in the middle of coal pillar,the stability of coal pillar is good.When the width of coal pillar is 22 m,the stress of roadway protection coal pillar is monitored in the period that the hydraulic support 2—106B working face is removed.The results show that surrounding rock of roadway is stable,the stability of roadway is good.
    Application of the Open—pit Mining Boundary in Jijiping Stope of Baima Iron Mine
    SHUAI Pei, ZHANG Liang-Bing, XU Ji-Ye
    2019, 35(04):  74-76. 
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    In recent years,Jijiping Stope of Baima Iron Mine has been affected by various factors,such as low ore price,excessive economic and reasonable stripping ratio in the original design and unreasonable delineation of upper plate local boundary,which lead to high production cost and poor benefit of mining enterprises.Based on the analysis of the market price trend of vanadium—titanium magnet concentrate,the economic and reasonable stripping ratio is re—determined to be 4.34 t/t.According to the principle of open—pit boundary delineation and the actual situation of the mine,the open—pit mining boundary of Jijiping Stope is optimized.After optimization,the ore volume is reduced by 20.019 3 million tons,the stripping rock volume is reduced by 1.424 331 billion tons,and the stripping ratio of rock and ore in the optimized position is 7.11 t/t.Ideal social benefits and economic benfits of Baima Iron Mine are obtained by the optimization of open—pit mining boundary of Jijiping Stope,which is help for the goal of reducing the cost and increasing the efficiency of the mine.
    Application of One Blasting Shaft Excavation Technique in Beiminghe Iron Mine
    ZHENG Xin-Yu, WENG Sheng-Jun, XIE Ming-Xing
    2019, 35(04):  77-79. 
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    The cutting shaft construction by shallow drilling based on 7655 drilling machine is the common method for sublevel caving mining operation,but the shortcomings such as high labor intensity,low efficiency are existed,beside that,the operation safety cannot be ensured.In order to reduce the labor intensity of the construction of cutting shaft and ensure operation safety,according to the geological characteristics and technical conditions of Beiminghe Iron Mine,one blasting shaft excavation technique based on medium—length drilling and hole segmented blasting by domestic 8920 drilling trolley and SIMBA H1354 medium—length drilling trolley instead of 7655 drilling machine is proposed.By verification of field test results,the construction period is shortened by 4 days,the labor efficiency is improved,and average caving height is higher than 8 m by using the technique proposed in this paper.According to the calculation results of the construction of 15 cutting shafts of the mine,about 119 800 yuan can be saved.The technical support for the goal of reducing costs and increasing efficiency of the mine is provided.The one blasting shaft excavation technique is worth applying in the whole mine.
    Controlling Scheme of Blasting Vibration and Safety Measures of the Deep Hole Blasting Practice Near Oil Pipeline
    JIN Ke, ZHANG Xi-Liang, JIANG Dong-Ping
    2019, 35(04):  80-82. 
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    Taking the controlled blasting practice of a limestone mine near the oil pipeline as the engineering background,according to the characteristics of the explosion zone and the safe vibration speed of the protected pipeline,a reasonable controlled blasting scheme is developed,deep hole blasting parameters are provided,and blasting vibration is monitored.Through careful design and construction,the normal mining needs of the mine is met,safety of the oil pipeline is ensured,besides that,the valuable experience for similar projects is accumulated.
    Flotation Test on Oxidized Copper Ore in Ganluo,Sichuan Province
    HU Jun, YAO Yao, LAI Sheng, LUO Bo, LI Jian-Bing
    2019, 35(04):  100-104. 
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    The average grade of Ganluo copper ore is 1.96%,the content of harmful elements are extremely low.The natural type of ore is single,malachite is the main metal mineral.In order to realize the effective recovery and utilization of the copper ore,the bulk flotation process was used to beneficiation test.The result show that it could get copper grade of 24.07% and 77.12% recovery copper concentrate at grinding fineness of -0.074 mm accounted for 77%,under two roughing,four cleaning and two scavenging closed circuit bulk flotation process,with sodium sulfide dosage 3 000 g/t,the combined collector(butyl xanthate+butyl ammonium+hydroximic acid) dosage 120+60+30 g/t,but it's hard to recycle the malachite lost in tailings,which is mixed with iron,filling in cracks or micro-cracks,with finer grain size,the mineral liberation is very difficult,so it is difficult to be recovered.
    Study on Process Mineralogy Characteristics of a Cu—Ni Ore in Xinjiang
    SUN Jing, FENG Bo
    2019, 35(04):  105-108. 
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    In order to provide technical basis for the development and utilization of a large scale low—grade strong copper nickel oxide sulfide ore in Xinjiang,the mineralogy research of a copper—nickel sulfide ore and bulk flotation was studied.The result shows that ①the grade of copper and nickel are 0.075% and 0.57% separately,both copper and nickel minerals exist in form of sulfide phase,in which garnierite is hard to be utilized; ② The main useful minerals are chalcopyrite and nicopyrite,of which both can be concentrated via flotation,olivine exist as main mineral in gangue; ③The pattern of nicopyrite is idiomorphic or half—idiomorphic homogeneity under microscope,in which nicopyrite particles shown in irregular form or disseminated with pyrrhotite or chalcopyrite in different pattern are easy to be concentrated via flotation.Meanwhile,part minerals are hard to be utilized due to the size of which exist in the pattern of the disseminated or the ore shows typical inequality disseminated grains,which is too fine to be liberated while grinding.Most chalcopyrite shows in the form of irregular and disseminated in gangue sporadically; ④ Mixed concentrate with the nickel grade of 9.17%,copper grade of 1.57%,nickel recovery 68.01%,copper recovery 87.37% was achieved while the grinding particle size was -0.074 mm accounted for 80% through the flow of one roughing one cleaning two scavenging,and middling return to the process in sequence.The enrichment of copper and nickel is relatively well.
    Experimental Study on Re-beneficiation of Pb-Zn Ore Flotation Tailings of Xitieshan
    FU Jin-Tao, PEI Yun-Yun, HUANG Chao-De, TONG Yi-Long, LIU Cheng-Xin, YIN Jia-Qi
    2019, 35(04):  109-113. 
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    The pyrite grade 15.59%,gold grade 0.29 g/t and silver grade 8.28 g/t of lead—zinc flotation tailings of Xitieshan has comprehensive recycling value.Experimental study on re—beneficiation of tailings showed that the sulfur grade 42.73% and the recovery of 86.56%,gold grade 1.01 g/t and the recovery of 85.85% and silver grade 31.91 g/t and the recovery of 82.59% could be obtained with the grinding fineness of -0.074 mm accounted for 70% by only one roughing.This study has great theoretical and practical significance for the comprehensive utilization of resources.
    Study on flotation test of a copper—lead—zinc polymetallic sulfide ore
    RAN Yin-Hua, XIAO Dong-Sheng, DU Jian-Ming, AO Jiang, LI Qiang, HONG Xia
    2019, 35(04):  114-118. 
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    Some polymetallic sulfide ores in yunnan has copper grade of 0.45%,lead grade of 3.18% and zinc grade of 4.21%,containing 30.10 g/t silver,The useful minerals are mainly chalcopyrite,sphalerite and galena。Chalcopyrite and sphalerite are metasomatic or mixed—dyed,with uneven grain size.85.11% copper exists in the form of primary copper sulfide,lead and zinc ores also occur in sulfide ores。 The flotation test results show that under the condition of grinding fineness -0.074 mm 80%,CaO+Na2S+Na2SO3+ZnSO4 as the adjusting agent,isopropyl xanthate as the collector,730A as the foaming agent,the mixed closed—circuit flotation of 1 crude,3 fine and 2 scavenging copper and lead can obtain a copper and lead mixed concentrate with yield of 6.50%,copper grade of 5.20%,lead grade of 43.64%,copper recovery rate of 75.11% and lead recovery rate of 93.00%.The zinc concentrate with yield 7.60%,grade 46.94% and recovery 85.76% can be obtained by using CuSO4 as activator and butyl xanthate as collector 1crude,2fine and2 scavenging closed circuit cleaning process.lead concentrate with grade 42.23%,recovery 86.38% and The copper concentrate grade 27.65%， recovery 61.88% can be obtained by 1 coarse and 1 fine separation and flotation of the copper and lead mixed concentrate.Copper,lead and zinc concentrate reached the corresponding quality standards,and silver was recovered.The test results can provide technical reference for the development and utilization of the ore.
    Research on Process Mineralogy of a Porphyry Gold—bearing Copper Ore
    FU Fei-Long
    2019, 35(04):  119-121. 
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    In order to provide some guidance to the research on development and utilization of a porphyry and low—grade gold—bearing copper ore,the process mineralogy on the ore was conducted.The result showed that the raw ore contained 0.44% Cu and 0.092 g/t Au,the object ore is mainly chalcopyrite,secondly covelline and bornite,all of which have simple mineral dissemination characteristics and easily to be liberated.The gold mostly exposed,the gold content is a little related to sulphide ore and non—sulphide ore.The contents of pyrite and gangue minerals are high and their compositions are very complex,which will be the main factor on the separation of these useful minerals.The study showed that the processing of coarse—grained tail—throwing and fine—grained separation was suitable for this ore.It was predicted that the theoretical recovery of copper is between 82.98% and 89.59%,and the recovery of gold is 78%~84%.
    Development and Application Research of a New Type of Dry Magnetic Separator for Pulverized Ore
    WANG Shun, XIN Qing
    2019, 35(04):  133-135. 
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    In order to solve the problem of enrichment of magnetic minerals in dry and water-deficient areas,a new kind of air force dry magnetic separator for powdery minerals is developed,with large wrap angle,multiple magnetic poles,high magnetic field strength and high rotary speed,which can realize dry pre—separation of 5~0 mm powdery magnetite and efficient dry magnetic separation of fine powdered magnetite.The test research shows that:① For the de—phosphorization product from KBH of South Africa with Fe grade of 51.75%,particle size of -1 mm and moisture content of 3% to 5%,through one process of FX0665 type air force dry magnetic separator for powdery minerals,iron concentrate with Fe grade of 61.05% and recovery of 90.85% is obtained.② For the -2 mm sample (Fe grade 60.76%) of an iron ore from Hami,Xinjiang,through FX0665 type air force dry magnetic separator for powdery minerals,iron concentrate with Fe grade of 64.53% and recovery of 95.02% is obtained; after the samples are ground to 70% -0.074 mm and through dry magnetic separation,iron concentrate with Fe grade of 68.10% and recovery of 95.70% is obtained.③ For an iron ore tailing from Bagang of Xinjiang with Fe grade of 15.31%,through FX0665 type air force dry magnetic separator for powdery minerals,iron concentrate with Fe grade of 52.31% and recovery of 12.71% is obtained.The testwork research shows that the air force dry magnetic separator for powdery minerals has strong adaptability to different ores,and it is an efficient equipment for enriching magnetic minerals in dry or water—deficient areas.
    Upgrading and Reforming Application of Transportation Information Collecting and Closing System in Duerping Coal Mine in Shanxi Province
    WU Deng-Xian-
    2019, 35(04):  136-139. 
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    In order to enhance the signal communication ability of the information collecting and closing system in Duerping Coal Mine and improve the monitoring and monitoring ability of the information collecting and closing system for locomotive operation in the main roadway of mine transportation,the information collecting and closing system in Duerping Coal Mine has been upgraded and reformed.By installing an intelligent communicator at the entrance of the south roadway,the north one stone roadway and the north two roadways of the underground transportation roadway,respectively,the information collecting and closing system in the direction of the south roadway,the north one stone roadway and the north two roadways can be operated separately.At the same time,the cable signal transmission between underground intelligent communicator and ground dispatch is changed to optical cable signal transmission,and the cable signal transmission between communicator and local control substation is also changed from the original cable signal transmission to optical cable signal transmission.The optical cable signal transmission distance is long and the loss is small,which is more conducive to the flexible,fast and accurate transmission of signal for downstream equipment,and more conducive to improving the stability of the signal collection and closure system.After the system upgrade and transformation,the communication capacity of the system is improved,the signal transmission efficiency of the system is improved,the stability of the system operation is enhanced,and the monitoring and monitoring ability and dispatching command ability of the system for the locomotive operation in the transportation roadway are enhanced.
    Adaptability Analysis of Support for Fully Mechanized Caving Working Face in Thin Bedrock Thick Coal Seam of Shanxin Coal Mine
    LI Jiang-Long, REN Yao-Fei
    2019, 35(04):  159-160. 
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    In order to analyze the law of roof pressure under the condition of shallow sublevel caving in Shanxin Coal Mine and guide the safe mining in the mine,KJ21 type mining pressure monitoring system is adopted for the the observation for 18041 fully mechanized caving working face.By using the mine pressure monitoring system,the adaptability of the fully—mechanized caving support is analyzed from the aspects of the initial and final resistance of the support,the increasing resistance of the support,frequency distribution of the working resistance of the support and the balance of the force of the jack.The results show that support adaptability of the working face is good,support selection is reasonable.
    Optimization and Design of the Complicated Ventilation System of Jiguanzui Gold Mine
    YUAN Lei, LI Na
    2019, 35(04):  163-166. 
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    The mining activity of Jiguanzui Gold Mine is entered into deep mining stage,with the gradual introduction of production of the deep sections of the mine,the roadway relationships is more complicated,the problems such as long ventilation line and large ventilation resistance are becoming more and more serious.In order to solve the problems such as air volume insufficient,reverse airflow and air leakage in the middle production section,the ventilation system of the mine is optimized.Though the comparative analysis of four ventilation schemes,the one based on early underground concentration and late multi—stage machine relay is selected as the optimal scheme.In early stage,the main fan is used for centralized ventilation to meet the requirements of early stage ventilation,the investment of early stage engineering and fan equipment is reduced,there is no need to expropriate land,it facilitates ventilation management,in the late stage,the main fan in the early stage can be used as II level machine station relay.Besides that,three—dimensional ventilation calculation of the improvement scheme is done,the effective wind rate can reach 73.66％,and the wind speed qualification rate is greater than 75％,which is higher than the standard value.After the optimization of the ventilation system,the intended effects are obtained,the needs of safe production and operation environment in mines is met.
    Study on Reasonable Support Resistance of Two Sides in Deep Shaft Mining Roadway under Bolt Shotcrete Support Condition
    LU Yong-Hu, LIU Chang-Wu, ZHOU Xian-Liang, ZHANG Lian-Wei, FENG Bo
    2019, 35(04):  167-170. 
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    According to the model of fracture instability and shear instability failure of two sides of mining roadway,the reasonable support resistance of two sides of stability and the composite support of bolting and shotcreting under the condition of bolting and shotcreting support are studied.On the basis of analyzing the failure characteristics and mechanism of two sides of rock bolts and solids in the mining laneway,it is considered that the design of the two sides in the deep well mining roadway is partial to safety according to the shear instability failure model.Based on the above discussion results,the design and calculation method of the support resistance of two sides of bolting and shotcreting support under the condition of bolting and shotcreting support is put forward.The above study conclusions can be used as a reference for the reinforcement mechanism and design of bolting and shotcreting support.
    Study on the Optimal Anchor Bolt Layout Parameters in the Mining Roadway of a Mine in Xinjiang
    ZHANG Lian-Wei, LIU Chang-Wu, LU Yong-Hu, ZHOU Xian-Liang, FENG Bo
    2019, 35(04):  171-174. 
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    Based on the study background of Ⅰ1 mining area of a mine in Xinjiang and FLAC finite difference software,the variation laws of plastic zone range,stress and displacement in the mining roadway with and without support are compared and analyzed;vertical displacement monitoring and horizontal displacement monitoring are carried out for the middle point of roof and right side respectively,the variation of surrounding rock displacement under different anchor bolt layout parameters is compared and analyzed;the stress concentration coefficient and surrounding rock displacement are treated with dimensionless processing and the comprehensive evaluation index is obtained.Based on the numerical simulation results of FLAC and the comprehensive evaluation index analysis,the optimal anchor bolt layout parameters are obtained,which provides a reference basis for tunneling and maintenance of the mining roadway.
    Deformation Regularity and Reinforcing Supporting Design of the Surrounding Rock in Gob Side Entry Retaining of Lutaishan Mine
    HAN Jin-Yong, ZHANG Jun-Peng, YAO Shi-Jie, WANG Wen
    2019, 35(04):  175-177. 
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    In order to alleviate the tension situation of continuous mining of Lutaishan Mine,reduce the amount of roadway tunneling in the adjacent working face sections and the cost of tunneling,and ensure the smooth replacement of 2203 working face,the test of god side entry retaining along the track of 2202 working face is done.According to the surrounding rock geological conditions of the roadway,and based on theoretical analysis and pre-split blasting roof technique,the supporting scheme of gob side entry retaining by roof cutting and pressure relieving is proposed.The mine pressure development regularity in gob side entry retaining by roof cutting and pressure relieving is summarized by continuously observing the surrounding rock deformation data of the roadway during stoping process.The above study results can provide reliable reference for the practice of god side entry retaining of Lutaishan Mine.
    Study and Implementation of Passing Through Folding Structure in Coal Roadway
    XIAO Qiang
    2019, 35(04):  178-180. 
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    In view of the large-scale fold structure encountered during the 8120 return airway excavation process of Dayangquan Coal Mining Company,the technical scheme of advance geophysical exploration+grouting reinforcement+high prestressed anchor bolt and cable joint support is proposed.The practice results show that the scheme can guarantee the safety of the roadway during the process of passing through the fold structure,shorten the working hours and increases the coal recovery rate and create huge economic and social benefits.
    Application Practice of Grouting Reinforcement Technique for Roadway Roof
    WANG Qiang, BAO Yuan-Tang, JIAO Hao, YANG Peng-Fei
    2019, 35(04):  181-183. 
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    A coal mine in Shanxi Province is affected by the accumulation of water in the goaf of 15101 working face when the excavation 15102 is transported to 375 m.The roof of the roadway showed a large amount of water,which is leaked through the cracks of the K2 limestone and anchor rope and bolt.The amount of water in the roof of the roadway heading is nearly 30 m3/h,and the mining succession is seriously affected.According to the experience of water damage prevention and research analysis,a technical scheme of segmented grouting reinforcement is developed.The 15102 transport slot pass—through 375~660 m section and 720~1 705 m section are used for grouting reinforcement with sulphoaluminate cement composite;for the 660~720 m section,roof rock stratum tectonic development,three—dimensional sealing and reinforcement is done by using advanced chemical slurry.The practice show that the scheme can effectively prevent the roof from dripping water while improving the safety factor of the construction of working face,besides that,the threat of goaf water—rich area to working face can be avoided effectively.
    Progress of the Ecological Restoration Technology of the Abandoned Acid Tailing Land
    FAN Jing-Biao, XIONG Ming-Yu, ZHONG Jun-Hua
    2019, 35(04):  208-211. 
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    Sulfide is contained in the waste rock in abandoned acid tailing land,sulfuric acid is produced under the leaching of rainwater,acidification of the abandoned land is intensified,the enterprise environmental protection cost is improved.The acidification can be controlled fundamentally by ecological restoration work.According to the acidification mechanism of abandoned tailing land,combined with the latest study progress at home and abroad,the study status of ecological restoration is analyzed,the adaptability and advantages and disadvantages of the methods such as isolate coverage,improver modification,phytoremediation and microbial technique are discussed.Besides that,the application examples of the isolation coverage and phytoremediation technique and in—situ improvement and phytoremediation technique in Reden Coal Mine and Yongping Copper Mine are discussed.According to the characteristics of the abandoned acid tailing land,it is show that the shortcomings of the single methods is obvious,it is necessary to take integrated method to deal with the abandoned acid tailing land,isolation coverage and phytoremediation technique and in—situ improvement and phytoremediation technique can taken as the main study directions due to characteristics of less time consuming ,good effects and simple operation.
    Design and Implementation of Soil Heavy Metal Pollution Assessment System in Mining Area
    SUN Li-Guo, LI Ya-Jun, ZHOU Shi-Qiang, DU Yi-Bo, PAN Yan-Wen
    2019, 35(04):  212-216. 
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    Traditional monitoring methods of heavy metal pollution in soil are time-consuming,laborious,inefficient,single and lack of verification of evaluation results.In order to solve these problems,the correlation between evaluation index and evaluation model was analyzed through experiments,and a WebGIS-based soil heavy metal pollution evaluation system was designed.The system used GIS spatial interpolation technology and various evaluation models to complete the evaluation of soil heavy metal pollution in mining areas,which provided strong support for monitoring and prevention of soil heavy metal pollution in mining areas.