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    25 June 2020, Volume 36 Issue 06
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    Analysis on the Situation for in Short Supplied Mineral Resources in Need of #br# China's Emerging Industries in the New Period
    Guo Jia, Yi Jining, Zhang Fuliang, Sun Zhenyi
    2020, 36(06):  1. 
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    Strategic emerging industries have become the focus of current and future world economic development,and the supply structure of related mineral resources has undergone new changes.This paper expounds the new demand for mineral resources in China's Industrial Development in the new period,summarizes the strategic emerging industries involved in the key areas,the main direction and mineral needs,comprehensively evaluates the resource endowment,foreigntrade dependence,supply and demand situation of 16 kinds of short supplied mineral resources,and under the new situation,judges that the short supply situation of 6 kinds of traditional mineral resources will be aggravated,such as chromium,nickel,copper,etc;the supply security of 10 kinds of strategic emerging mineral resources will be very prominent,such as cobalt,lithium,beryllium,etc..On this basis,five suggestions are put forward to alleviate the shortage of resources supply in China,which provide reference for the decisionmaking and deployment of mineral resources exploration and development in the new period.
    Present Situation and Thinking of Nonferrous Metal Green Mine Construction
    Wu Caiwu, Wu Heping,
    2020, 36(06):  6. 
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    The concept of green mine has developed from simple environmental protection to comprehensive utilization of resources.The pollution and destruction caused by the exploitation and utilization of resources have been highly valued by human beings.Energy conservation,emission reduction and environmental protection have become a very important topic in present world.Combined with the development of green mines in China,the influence factors of the transformation of the current nonferrous metal mineral resources and utilization,ecological environmental protection and social civilization and other aspects to the construction and development of green mines.The technical methods adopted and the construction experience gained in the construction of nonferrous green mines in China is summarized.It is concluded that at present,the construction of green mines in China can be described as shoulder heavy responsibilities,it is a longterm work,which requires the coordination and cooperation of enterprises,associations,governments and other parties.Based on the above discussion results,some key proposals related to the four aspects of regional layout,development strategy,model system and policy support of the construction of green mines in China are proposed.
    Geochemical Characteristics and Genesis of Seleniumrich Rocks in the Cambrian Black Series in Southwest Henan Province
    Ji Hengzhao Yi Zhiqiang Li Jiaoyan Wen Jing Su Baoping Zhao Weisen
    2020, 36(06):  13. 
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    The study area is located in the Xichuan fault polymetallic metallogenic belt in the eastern part of South Qinling orogenic belt at the junction of Henan and Shaanxi,with good metallogenic conditions.Through geological investigation and research in this area,the results show that:①the selenium content of rock is closely related to the lithology and formation age of rock,and is positively linear related to the carbon content and sulfur content of rock;②the selenium rich rock in the black rock series is formed in the continental margin in the environment of the transition zone between the ocean and the deep sea,it is consistent with the regional geotectonic background of the northern margin of Yangtze Landmass，it is a multisource genesis,which is the result of the interaction of normal anoxic deposition and hydrothermal exhalation deposition.Based on the above analysis,two prospecting target areas have been delineated,with good prospecting prospects,which is worth conducting further work.
    Prospecting and Prediction of Tin Polymetallic Depost in the Oreconcentrated Area in the North of Lianhua Mountain in Guangdong Province
    Yan Lunming Qian Longbing
    2020, 36(06):  18. 
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    Baxiang Jinkeng ore concentration area in the northern ore concentration area of Lianhuashan integrated exploration area,is one of the tin polymetallic mineralization concentration areas in the southwest section of Lianhua Mountain,Guangdong Province.In recent years,great progress has been made in tin polymetallic ore exploration in this area,and a largescale tin polymetallic ore deposit with a mediumsized and prospective prospect has been found in Jinkeng tin,copper,lead zinc and silver.By using the metallogenic model of Jinkeng deposit,the tin zinc deposit in the Northern Cross Road of the ore concentration area is located The evaluation also made a major breakthrough.Combined with the investigation results of 1∶50 000 mineral resources in the area,there is still a large potential for exploration in the ore concentration area.It is of great significance to study the relationship between tin polymetallic ore and metallogenic geological body,metallogenic structure and metallogenic structural plane,and to summarize the characteristics of mineralization.The study on the "Trinity" metallogenic characteristics of typical tin polymetallic deposits in the area shows that there are mainly three types of tin polymetallic mineralization: filling metasomatic type controlled by dynamic metamorphic belt,porphyry type and post magmatic hydrothermal filling type.The oreforming geological body is the late Jurassic Early Cretaceous intermediate acid intrusive rock mass and vein.The oreforming structural system is the fault structural system related to the northeast Lianhuashan fault in the DapuHuilai structural magmatic belt of the southeast coast.Theoreforming structure and structuralplane are mainly ne,NW and NNE faults and the slip and interlayer fracture planes in the ductile shear belt.On the basis of summarizing the characteristics of tin polymetallic ore mineralization and the elements of prospecting and prediction,the geological model of prospecting and prediction for tin polymetallic ore in this area is preliminarily established.
    Geological Characteristics and Prospecting Indicators of Huwan Tungsten Deposit in Xinxian County,Henan Province
    Yang Mingquan Yu Chaofan Liu Wei Zhang Yuanyuan Yu Cui
    2020, 36(06):  26. 
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    Huwan Tungsten Deposit is located in Huwan Town in Xinxian County,Henan Province,it is distributed in the eastern part of QinlingDabie orogenic belt,the mining area is an intracontinental orogenic belt dominated by metamorphism and deformation.Its basic tectonic framework is composed of lenticular weak strain regions (orogenic terrain) and linear strong strain zones (convergent boundary faults).The geological characteristics of metallogenic rock mass and deposit are analyzed in detail,the metallogenic regularities is discussed,besides that,the prospecting indicators are summarized.The results show that:①Huwan Tungsten Deposit is a quartz vein wolframite deposit with high temperature hydrothermal filling,it is mainly controlled by structural fissures,the wolframite mineralized quartz veins mainly occur in the structural fissure zone of garnetbearing mixed granite or gneissic granite;②wolframite ore bodies occur in dense fissures in the outer contact zone of concealed granite bodies and form microfine (feldspar) quartz vein wolframite deposits,while finelarge quartz vein wolframite deposits are formed when high temperature gashydrothermal fluid migrates into the structural fissures of surrounding rocks in the upper part of the rock mass;③the prospecting indicators in the mining area are mainly for EW and NWSE faults in the area,silicification,potassium feldspar,fluorite mineralization,surface black brown limonite,pyrokalium ironvanadium (leadvanadium) and alterations of coated malachite and tonglan,and comprehensive anomalies with W and Mo as the main components.
    Mineralization Enrichment Regularity and Ore Prospecting of Associated Goldsilver for Dahongshan Ironcopper Deposit
    Jin Xin Yu Can
    2020, 36(06):  30. 
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    Dahongshan Copper Deposit is a volcanic exhalationtransport and depositionmetamorphic reformation type deposit,which characterized by rich mineralization and complicated genesis.Based on systematic collection of geological data of Dahongshan mining area,the occurrence and enrichment mechanism of goldsilver mineralization is obtained by combined with the field geological surveying and test results.The study results show that:①the independent goldsilver mineral are mainly occurred in chalcopyrite and pyrite;②the submarine volcanic exhalationsedimentation establish foundation for goldsilver mineralizaiton,in addition,the foldsilver mineralization is mainly occurred in third lithologic member of Manganghe Formation;③the significant positive correlation between the goldsilver mineralization and copperiron mineralization is presented,which have most mineralization internsity among I2,Ib and I3 oresection;④the goldsilver mineralization has the characteristic of stratabound,and the ore evolution strictly controlled by volcanic activity and lithogacies paleogeography,the formation lithology,wallrock alteration,geophysical characteristics can be regarded as the prospecting criteria for Dahongshan goldsilver mineralization.
    Geological Characteristics and Genesis of Limestone Ore for Cement in Shidie,#br# Wuxuan County,Guangxi Province
    Zhao Zhenyun Liang Yanlan Jiang Huiqiao Wang Zhongwei
    2020, 36(06):  35. 
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    Wuxuan Shidie Limestone Deposit is located in Tongling Town,Wuxuan County,Guangxi.It is a large limestone mine for cement.It occurs in the upper Carboniferous Lower Permian Maping formation,and its lithology is light gray medium thick bedded bioclastic microcrystalline limestone with a small amount of dolomite.The ore quality is stable,and it is a single grade I product.Based on the discussion of geological characteristics and genesis of the deposit,the evolution process of sedimentary environment and material source of the deposit is analyzed.It is considered that the limestone ore of Wuxuan Shidie Cement Deposit in Guangxi belongs to the shallow water open platform type shallow marine biochemical sedimentary carbonate deposit.
    Threedimensional and Application of Complex Orebody of Lanniping Copper Deposit,Dongchuan County
    Wang Dewen Zou Guofu Zhou Han Yu Can Ma Zhenglin He Zongbao Zhu Xuefeng
    2020, 36(06):  39. 
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    Dongchuan Orefield is one of the most important metallogenic belts in China.Lanniping Copper Deposit is located in the north of Kunyang Rift,which characterized by complex origin and various shapes.Based on the modern metallogenic prediction theory,in combination with geological map,planar graph,prospecting line profile map and drilling data/pitting data,and by using DIMINE software,threedimensional models of the Baixila ore block of Lanniping Copper Deposit is established,which including surface model,stratigrapic model,fault model and orebody model.Then,reserve estimation by using the level section method and inverse distance weighted method are done.The study results show that the block model statistics method is applicable to a large scope and can obtain better results that the level section method.Moreover,the function of model constraint of DIMINE could be useful because it can estimate rapidly the resource of any given space range or within any given grade range.In addition,it can clearly reflect the variation features of ore grade values,and the calculation result can provide full information and data for resource reserve evaluation.The threedimensional geological modeling by using multivariate information has several advantages such as better visualization,high reliability，and can be used to analyze the geological structure of the mining area and deposit genesis,besides that,it is an effective means for the next step of geological exploraiton in mine.
    Geophysical Characteristics and Prospecting Direction of a Copper Deposit in Dete,Zimbabwe
    Jiang Weihua Qing Yun Yan Hao
    2020, 36(06):  44. 
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    1∶10 000 galvanic sweep measurement was on a copper deposit in Dete Area of Zimbabwe is carried out.The polarizability and resistivity of rock (ore) in the mining area were measured and interpreted respectively.The results show that the types of rocks (minerals) in the mining area are relatively simple,and the difference in electricity rent rate is not large.The difference in polarizability is mainly caused by the plagioclase of malachite,pyrite mineralization,and chalcopyrite in the surface silicified fracture zone,and the relatively low resistivity is caused by the mineralized silicified fracture zone,and these are considered good prospecting directions.
    Geological Characteristics and Metallogenic Regularity of Zuosikong Leadzinc Deposit in #br# Xinping County,Yunnan Province
    Tang Yufei Wang Zhengxing Yu Can Yang Tao Liu Changcheng Liang Yuhang
    2020, 36(06):  46. 
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    Zuosikong Deposit is a leadzinc deposit which located in intersection part between the western wing of Yunnan “mountain” shape arc and Ailaoshan structural belt.Among them,Zuosikong Leadzinc Deposit attracts particular attention because it owes variety mineralzation types.However,the reason for the different geological characteristics has not been redefined.In addition,the comprehensive study of metallogenic series is relatively weak,and the metallogenic model is urgent to be established.Based on the regional geological background,deposit geological characteristics and mineralization regularity are studied.The resutls show that the orebodies (mineralization) are occurred in quartz vein of basement strata of Dahognshan Formation in Early Proterozoic.Besides that,the structure fracture zone between Upper Triassic and the unconformity surface of in underlying Dahongshan Formation are the favorable orebearing space.The most important factor of the ore formation are the tectonism in YanshanicanIndoChinese Epoch,and the metallogenic material are mainly derived from the Dahognshan Formation.The oreforming elements have been activated and migrated by the impel of tectonism,and the fault structure provided migration pathway and orebearing sites to mineral deficiency.
    Ore Genesis and Metallogenesis of Nanchang Leadzinc Deposit in Southern Yunnan#br#
    Li Zhengzhang
    2020, 36(06):  50. 
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    Nanchang Leadzinc Deposit is located in northern section of Mesozoic SimaoLanping depression,which has complicated tectonic framework and superior metallogenic condition.Based on the field geological survey of Nanchang leadzinc Mine and the analysis of its metallogenic geological background,geological characteristics,metallogenic mechanism and ore genesis,it is found that the orebodies are mainly occurred as lenticular in Yunlong Formation of Tertiary (Eyb) and Jingxing Formation of Lower Cretaceous (K1j1),and the Lower Yunlong Formation (Eya) is an efficient shielding layer in deposit.Besides that,the faint fadealteration occur at contact position between strata and surrounding rock.The Nanchang leadzinc deposit developed sandstonetype ore,limestonetype ore and oxidized ore,which has obvious sedimentary structure,and the ore has hydrothermal and metamorphic alteration characteristics in some areas.The strata and tectonic in mining area are proved to be the main factors in the formation of the deposit.The orebearing structure and oretransmitting structure are faults.The high salinity hotbrine has enriched in favorable stratigraphic horizon and tectonic,which migrated along the oretransmitting structure.The results show that Nanchang deposit is a multiple genesisstrata bound type leadzinc deposit which is related to hot brine.
    Type and Tectonic Setting of Gaojishan Volcano in Wunuer Area,Great Xing'an Range
    You Jiangong, Li Liyang,
    2020, 36(06):  54. 
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    AbstractGaojishan volcanic locates at Great Xing'an Range volcanic belt,Gaojishan volcanic is studied with "volcanic constructionlithologic rock faciesvolcanic sequence" mapping method.The study results show that the rock types developed in the Gaoji Mountain volcano are mainly rhyolitic crystal tuff,rhyolitic ignimbrite,rhyolite,black obsidian,etc..Lithofacies are mainly lacustrine accumulation phase,overflow phase,pyroclastic flow phase,transgressive phase,subvolcanic rock phase and steammagma explosion phase,and eruption sedimentary facies can be seen locally.According to the comprehensive analysis,the volcanic type of Gaojishan volcanic is caldera,and volcanic activity mainly experienced four stages,such as volcanic eruption stage,volcanic collapse stage,volcanic revival stage and tectonic destruction and denudation stage.
    Mathematical Model and Application of Line/Surface Deformation Primitives Based on Scanning Point Cloud
    Zhao Long, Tian YanpingYang, Qiangsheng, Duan Weiping,
    2020, 36(06):  65. 
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    Study and Application on the Treatment of Suspended Roof of Dahongshan Iron Mine by #br# Sublevel Caving Without Bottom Column
    Ma GuanfuXu Wa nshou
    2020, 36(06):  72. 
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    The 4 million t/a secondstage mining project of Dahongshan Iron Mine adopts the highsegment structure parameters of the subcolumn sublevel caving method of 30 m×20 m,which has played a leading level in similar mines in China.Affected by mining methods,the problem of overhanging after blasting has become a common problem in the sublevel caving method without bottom pillar.In order to solve this problem,the main reasons for the occurrence of the suspended ceiling and the measures for the natural fall of the blasting vibration of the peripheral approach to treat the suspended ceiling are mainly studied.After longterm use and verification in Dahongshan Iron Mine,its safe,reliable and lowcost characteristics are best arranged in the suspension treatment measures and have good promotion and application value.
    Analysis on the Key Quality Control Points for Construction of Geothermal Well in the Middledeep Layers
    Xue Chao Ge Yu Wei Xiao Zhang Yugui
    2020, 36(06):  76. 
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    In recent years,geothermal resources have attracted wide attention from all walks of life.Especially in the development and utilization of middle and deep water thermal resources,compared with conventional geothermal well construction,the middledeep geothermal wells are characterized by larger depth,more complex construction process,high requirements for well completion and great difficulty for constrution.Therefore,it is very important to study the construction process of middledeep geothermal wells.On the basis of consulting a large number of materials,collecting and analyzing the achievements of predecessors and combining with years of work experience,detailed analysis from the construction process of geothermal wells,division of subprojects,and requirements of key technical indicators for well completion is done.Finally,the key quality control points during the construction of middledeep geothermal wells are proposed.It provides reference for the construction of middledeep geothermal wells.
    Numerical Simulation and Application of Airdecked Charge in Periphery Hole of Mine Excavation
    Yang Panlei Gao Feng
    2020, 36(06):  79. 
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    Continuous charge is often used in the blasting of hard rock roadways.In view of the serious overexcavation around the explosive caused by too much charge and the underbreak problem of the hole due to the strength of the rock,the axial air interval charge structure is proposed.According to the theoretical calculation results of the length of the crush zone after blasting and the relevant experience of similar mines,the charging parameters of the interval length is determined as 40 cm.The numerical model of 40 cm interval charge structure was built and the simulation analysis is carried out.The results show that good blasting effect can ensured by 40 cm air interval charge,so that the lower rock of the explosive could protect the upper wall rock from being damaged under the premise of sufficient destruction,and could guarantee the tensile failure of the orifice rock.Field tests are conducted to verify the blasting effect of airspaced charge in hard rock.Compared with the blasting without airspaced charge,the number of semiholes in surrounding holes increased and the blasting effect is significantly improved under the condition of ensuring the overall formation of roadway.
    Application of Upward Horizontal Slicing Filling Method in Xiajiadian Gold Mine
    Wang Xin
    2020, 36(06):  83. 
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    The stability of the upper and lower surrounding rock of Xiajiadian Gold Mine in Shaanxi Province is weak,it belongs to difficulttomine ore body.The test mining operation is conducted by adopting openstope method and caving method,the depletion loss rate is as high as 20％~ 40%,the ore grade is low,utilization rate of resources is low,and the technical and economic benefits are poor.In order to reduce the mining loss and dilution rate and improve economic efficiency,the upward horizontal slicing and filling method is adopted,the ore loss in the mining process is reduced effectively,the recovery rate is 94%,the dilution rate is 6%.The stope layout is simple,which could reduce the amount of preparatory cutting work,save the engineering cost,shorten the preparation period of stope and reduce the comprehensive cost of mining,besides that,the stoping process is simplified,labor productivity is improved,the consumption of productive or nonproductive materials is reduced and the lowcost production is realized.The upward horizontal slicing and filling method could also improve the utilization rate of resources and prolong the production life of mines,at the same time,the mine economic benefits is increased,which meets the requirements of green mine construction at present.
    Mining Blasting Technique in Complex Environment in Small Stone Mines Supporting for Construction Projects
    Li Houlong He Yongfang Yu Zhou Cheng Long
    2020, 36(06):  87. 
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    Compared with the traditional quarries which aim at obtaining mineral products,the stone mines supporting for construction projects have the characteristics of complex surroundings,high construction intensity,short life cycle,flexible and changeable engineering quality requirements,and large workload of blasting safety alert.Based on the example of the blasting mining in Cosco Shipyard Phase II project stone mine in Putuo Liuheng Island,introduced the key points of the design and construction technology and the construction experience of this kind of mine blasting.The existing problems of the mining blasting practice in complex environment in small stone mines supporting for constructin projects,besides that,the above discussion results can provide some reliable reference for the similar engineering practices.
     Test of Induced Caving Mining in Southeast Area Broken Stope of Meishan Iron Mine
    Qiu Haitao Ding Hangxing
    2020, 36(06):  91. 
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    The joints and fractures of the broken stope in the southeast area of Meishan Iron Mine are developed,the stability of the rock is poor,the ore recovery rate is low,and there are a lot of residual ores.In order to fully recover the residual ore in the upper levels,an experimental study on induced caving mining method was carried out.According to the structural plane survey and stability classification in this area,the stability classification of -303 m and -318 m level of ore bodies is in the unstable to extremely unstable range,and it is easy to fall.Based on the principle of arched fall,the stress state of the surrounding rock of the roof was analyzed,and the continuous fall span of the roof rock mass which caused the mining space was calculated to be 34.2 m.Therefore,a twostep mining method of induced caving method was designed.Induced caving was adopted in -303 m level rock mass,and then the -318 m level ore was recovered.In order to reduce the damage of the blast hole,the length of the blast hole in -318 m level was shortened.According to the design,the middle of -303 m segment S5~S8 normal mining approach is reinforced to encrypted approach.According to the ore flow rule and spatial location of the residual ores,the -318 m level S7 and S8 approaches are designed as the main trench recovery lanes,S6 and S9 are used as auxiliary recovery lanes.According to the field mining test results,the apparent recovery rates of the S5 and S6 approaches in the -303 m level reached 151.18% and 193.97% respectively;the apparent recovery rates of the S7 and S8 approaches in the -318 m level reached 129.15% and 134.05% respectively,which further show that the application results are significant.
    Optimization Selection on the Development System of Shanghe-Wangyu Mining Area
    Li Helin, Hu Wei, Wu Fei,
    2020, 36(06):  95. 
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    In order to solve the existing problems of low lifting capacity and high production cost of Shanghe-Wangyu Mining Area of Lunan Mining Co.,Ltd.,the joint development of Shanghe mining section and Wangyu mining section which are under construction is designed,based on the fully utilization of the existing development projects,the optimization of the development system of ShangheWangyu Mining Area is done by means of comprehensive comparative analysis method.According to the construction status and design situations of the development system of ShangheWangyu Mining Area,two integrated development schemes and one subdivision development scheme are proposed.The comprehensive comparative analysis of the three schemes are conducted from the aspects of infrastructure investment,infrastructure time,annual operating expenses,downtime and maximum capacity improvement.Finally,the integration and development scheme of Wangyu main well is determined as the best one among the three alternatives.The scheme can not only effectively solve the problems of insufficient lifting capacity and high production cost,but also has little impact on normal production of the mine,which provides a certain space for expansion of the mine and generating more significant economic benefits.
    Evaluation of Reliability of Single or Double Blasting Network Application in an Iron Mine
    Gu Chunlei
    2020, 36(06):  98. 
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    A highprecision detonator detonation network usually uses a surface detonator at a connection point.This detonation network is simple in construction and low in cost.However,a single detonator connection is difficult to guarantee a stable blowout under any circumstances.Taking an openpit mine as the stduy example,the singleconnection network is changed to a double network.This means that there are two surface detonator connections at each of the blast points.Double network design is inferior to single network design in terms of construction efficiency and cost,but double network is obviously better than single network in terms of bursting reliability，besides that,its safety and economic benefits are considerable.It is suggested that double network blasting design should be adopted when economic conditions permit in some mines.
    Experimental Study on Flotation of a Fine Refractory Copper (Molybdenum) Ore
    Liu Chunlong, He Xiaomin, Miao Yan, Li Guang, Huang Yidong, Zhu Housheng
    2020, 36(06):  109. 
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    In order to develop and utilize a finegrained refractory copper (molybdenum) ore resource in Heilongjiang Province,a beneficiation test were carried out on the basis of process mineralogy.The results show that the useful elements in the ore are copper and molybdenum,the main copper mineral is chalcopyrite and bornite,the main molybdenum mineral is molybdenite,the main gangue mineral is feldspar and quartz.Under the condition that the grinding fineness was -0.074 mm account for 75%,and the regrinding fineness was -0.038 mm account for 80%,we could obtain a coppermolybdenum mixed concentrate with a grade of Cu 22.77% and Mo 0.436%,a recovery rate of Cu 89.77% and Mo 78.19%.
    Study on Flotation Tests for a Lowgrade Mixed Sulphideoxide Copper Ore in Yunnan Province
    Gan Yonggang
    2020, 36(06):  112. 
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    A lowgrade and highoxidation rate of mixed sulphideoxide copper ore in Yunan Province contains Cu content of 0.33%,copper sulphide of 49.09% and copper oxide of 50.91%.In order to determine the development and utilization technology of the ore,the mineral processing testing studies were carried out.The results presented that in the case where the grinding fineness is -0.074 mm accounting for 86.40%,the copper concentrate with copper content of 18.58%,recovery rate of 77.55% and gold content of 4.23 g/t can be obtained by using a copper sulfide flotation process and a copper oxide flotation process with both one stage of roughingthree stages of cleaningone stage of scavenging procedures.The indexes of test results performed well,and the study realized an efficient comprehensive recovery of copper and gold in lowgrade mixed sulphideoxide copper ore,which could provide the technological design basis for the mine development and ore utilization.
    Experiment Research on Al2O3 Reducing Content for Chengchao Iron Concentrate
    Tang Qidi Wang Jing Liu Shu
    2020, 36(06):  116. 
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    Because the content of Al2O3 in the finished pellets of Chengchao Mining Company exceeded the standard,it affected the sales of finished pellets.In order to reduce the Al2O3 content of the iron concentrate,grindinglow intensity magnetic separation process is performed based on the mineralogy analysis.Results show that the presence of aggregated fine magnetite and aluminumbearing minerals is the main reason for Al2O3 content out of limit.The Al2O3 content of iron concentrate can be reduced via increasing the grinding fineness and reducing of the intensity of magnetic field.1.06% of Al2O3 content was achieved when the intensity of magnetic field was controlled at 105.89 kA/m and the grinding finenessof -0.076 mm accounted for 80%,with an iron recovery of 97.27%.Moreover,when the intensity of magnetic field was 113.85 kA/m with the grinding fineness of -0.076 mm for 85%,the Al2O3 content was 102% and iron recovery was 9798%.
    Study on Mineral Processing for a Gold Ore in Gansu
    Zhao Lei
    2020, 36(06):  120. 
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    The gold grade of a sulphide gold ore in Gansu is 3.34 g/t,the main gold bearing minerals are pyrite,arsenopyrite and galena.In order to determine the reasonable development and utilization process of the ore,the ore dressing test was carried out.The results showed that the gold concentrate with gold grade of 47.44 g/t and recovery rate of 91.87% was obtained by using one roughing two cleaning three scavenging and middings back to the flowsheet in turn process,with condition of grinding particle size of -200 mesh accounted for 70%.And the separation effect was ideal.
    Study on Rare Earth and Niobium Mineralogical Characteristics of Potassiumrich Slate in Bayan Obo Mine
    Jin Hailong, Wang Qiwei, Wang Zhenjiang, Wei Wei,
    2020, 36(06):  124. 
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    The major chemical composition,mineral composition and rare earthniobium mineral characteristics of Potassiumrich slate in Bayan Obo Mine were studied by means of multielement chemical analysis,automatic mineral analysis system,partial reflection microscope,field emission scanning electron microscope and energy spectrometer.The results show that the K2O content in the Potassiumrich slate in Bayan Obo Mine is up to 13.15%,and the content of SiO2 and Al2O3 is high.The rock is mainly composed of microcline and biotite.The content of REO and Nb2O5 in Potassiumrich slate is 0.076% and 0.012%,rare earth minerals and niobium minerals have low content,fine particles,diverse morphology and occurrence,complex mineral association and contact relationship,indicating that the Potassiumrich slate has suffered the late hydrothermal alteration and transformation.
    Research of Influence for HPGR on Grinding Operation
    Wang Jun et al
    2020, 36(06):  128. 
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    Experiment on Beneficiation of a Gold Mine in Sichuan Province
    Deng Chunhua et al
    2020, 36(06):  131. 
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    Application of Simba M4C Drilling Jumbo in Meishan Iron Mine#br#
    Yang Bing
    2020, 36(06):  136. 
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    The mediumlength hole drilling equipment used in the original mining operation of a mine is aging seriously.With the increasing of the section height,he hole depth is improved accordingly.In order to meet the demand of the construction of deephole drilling in mining,Simba M4C drilling jumbo is introduced.In view of the problems existing in the application process of the drilling jumbo,the corresponding solutions are put forward to ensure that the equipment can be put into use normally.Through the comparative analysis of the drilling effectively and the construction quality of mediumlength hole of the new and old equipment,the results show that,Simba m4c drilling jumbo has good performance,high degree of automation,high drilling accuracy and normal drilling efficiency,which fully meets the requirements of mediumlength hole drilling under the large structural parameters of the mine.
    Study on Emergency Trailer Operation Mode of Underground Scraper#br#
    Xu Chunpeng
    2020, 36(06):  139. 
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    Design and Application of Intelligent Technology in Explosive Plant
    Lyu Huihui Wang Weiping et al
    2020, 36(06):  143. 
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    Design and Application of Remote Control of Underground Scraper Based on 5g Technology
    Wu ZhiguangLuan Guiyong et al
    2020, 36(06):  147. 
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    Analysis and Prevention Measures of Coal Mine Gas Accident in Guizhou Province
    Sun Guangyu, Yang Fuling, Qi Chaoxin, Kang Xiangtao, Yu Zhaoyang,
    2020, 36(06):  149. 
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    Coal mine accidents in Guizhou Province are frequent,and there are many deaths,and gas accidents account for a large proportion of the total number of coal mine accidents and total deaths each year.In order to effectively improve the frequent occurrence of gas accidents in Guizhou coal mines,the statistical analysis method is adopted to briefly explain from three aspects of the distribution of the number of mines in Guizhou Province,the occurrence of mine gas accidents,and the control of mine gas overlimits.It is concluded that the important factors of the frequent occurrence of gas accidents in Guizhou province can be summarized as large number of small mines and concentrated distribution of outburst mines and higgas mines.The overall occurrence of gas accidents in coal mines in Guizhou Province can be described as the number of deaths in accidents is always higher than the number of accidents,major gas accidents occur frequently,coal mine gas accidents are mainly for coal and gas outburst accidents.Low ability to control gas over limit is a major difficulty in preventing and controlling gas accidents in coal mines in Guizhou Province.Based on the above analysis,some related countermeasures suggestions are proposed,which concluded accelerating the progress of elimination of backward production capacity in the coal industry,emphasis on gas prevention and control should be focused on outburst prevention and gas drainage,increasing safety education and training improving the ability to control gas exceeding limits in coal mines.The above discussion results can provide reliable reference for Guizhou Province to effectively prevent gas accidents and improve the overall safety production level of coal mines in whole province.
    Bolting and Mesh Support Technology of Roadway Driving Along Goaf in "Three Soft" #br# Coal Seams in Zhengzhou Mining Area
    Dai Yanqing
    2020, 36(06):  154. 
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    The technology of driving along the goaf can significantly improve the recovery rate,but in the area of stress concentration between the working face and adjacent goaf,the difficulty of roadway support is high,which leads to the application of the technology is limited.Aming at the problems of large deformation and higher repairation rate of "three soft" coal seam in Zhengzhou Mining Area,according to the limit equilibrium theory,this paper analyzes the stress state of the surrounding rock of the roadway,puts forward the corresponding bolt net support technology,and obtains the reasonable width of the small coal pillar of 2 m.At the same time,FLAC2D sotware is used to analyze the law of the inner supporting pressure of the coal pillar after the mining of 31071 and 31091 working faces,to explore the key factors that affect the deformation of the surrounding rock of the roadway,and to design the combined support scheme of the anchor mesh cable with the installation prestress of the anchor rod of 50 kN.The main parameters are as follows: the specification of the top anchor rod is 20 mm×2 400 mm,the spacing between the rows is 750 mm×800 mm;the specification of the side anchor rod is 20mm×2 000 mm,the spacing between the rows is 700 mm×800 mm.The industrial test was carried out on the air return roadway of 31091 working face.The experimental results show that the scheme has a good effect.
    Application of Tailings Neutralization Slags Grouting Technology to Karst Confined Water Treatment in a Mine
    Luo Laihe Wu Guanbin
    2020, 36(06):  158. 
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    There are a lot of tailings neutralization slags produced by Guizhou pressurized preoxidation beneficiation and smelting production discharge into tailings ponds,which are costly;a large amount of deep resources in Shuiyindong Gold Deposit are in karst confined water,which is threatened by floods.The mining plan is progressing slowly.A large number of tailings neutralization slags produced by pressurized preoxidation are taken as the main materials for grouting water treatment,by adopting neutralization slags grouting treatment and environmental transformation technology,the process parameters and technical indicators of grouting treatment are improved,the cost of grouting treatment has changed from 91.7 yuan/t for strong drainage planned in the early stage to 27.2 yuan/t.In the same time,through the neutralization slags grouting technology and repeated comparison and demonstration of materials and experimental inspections,the ratio of cement to neutralized slag is roughly controlled within 1∶2,and a complete set of preoxidized neutralized slags grouting technology is applied to the karst confined water process system,so as to reduce the cost of production and prevention of water,ensure the proved resources meet the conditions for the safety of ore body mining,solve the technical problems of confined water grouting treatment encountered in the process of resource mining,and realize the succession of mine resources.
    Study on the Optimization of Ventilation System in Beiminghe Iron Mine
    Wang Guangde, Wang Rongjun, Zhou Chaoqun, Wu Lengjun, Lu Zhiyong, Zhou Wei,
    2020, 36(06):  165. 
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    Beiminghe Iron Mine is a large underground black mine.It adopts the sublevel caving method without bottom pillar.The ventilation system adopts the central diagonal fourstage base station ventilation method.The two wings of the ore body enter the air and the middle return air.With the continuous downward movement of mining depth and the continuous change of ventilation network,there are some problems in the current ventilation system,such as insufficient total air volume,unreasonable air distribution in the middle section,pollution air circulation in the mining area,etc..By using the optimization technology of ventilation system and air volume control technology,the optimization measures of ventilation system adjustment are put forward to solve the above problems.Through the comprehensive comparison of the three ventilation system adjustment and optimization schemes,the final choice is to add the main air inlet fan at the stone gate of the west air shaft,and to coordinate the operation conditions of the main air inlet and return fans.The threedimensional ventilation system calculation program is used to calculate the optimization scheme,and then the field debugging is carried out according to the calculation results.It is determined that the operating frequency of two parallel fans in -50 m horizontal return fan station is 40 Hz/43 Hz.When the operating frequency of four fans in -230 m east and west inlet fan stations is 30 Hz,the operation conditions of the main fans of the inlet and return fans are in good coordination,and the total air volume of the system reaches 193 m3/s,which meets the theoretical requirements.The calculated total airvolume of the mine is 180 m3/s.At the same time,the problem of waste air circulation in the mining area is solved,and the ventilation effect of the mine is obviously improved.
    Study on the Safety Influence of Underground Mining to Complex Surface Environment of Langyashan Copper Mine
    Cao Xiaoping, Xu Zelin, Li Tongpeng
    2020, 36(06):  169. 
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    In order analyze the influence of underground mining to surface complex buildings and structures of Langyashan Copper Mine,the surface terrain and underground mining model is established,the surface subsidence caused by underground mining activity is simulated by numerical simulation method.The results show that the maximum surface subsidence value is 48.4 mm,and the distribution and spread of each subsidence area are uniform,maximum values of inclined deformation,curvature and horizontal deformation are less than the allowable indexes.The subsidence deformation obtained by numerical simulation is modified by the monitoring data acquired by the main monitoring line and auxiliary monitoring line arranged by means of simulated monitoring method.The maximum subsidence value of main monitoring line is 45.99 mm,the values of auxiliary monitoring line is consistent to the ones of main monitoring line.The study results show that the area near the maximum subsidence are is uniformly deformed,the mining activity has little influence on the safety of surface buildings and structures,which also provides a theoretical basis for the prevention and control of geological disasters in mines.
    Hazard Assessment of Geological Hazard in Huaibei Geological Garden#br#
    Fei Zhongliang
    2020, 36(06):  173. 
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    Taking the construction project of geological garden in Huaibei City as an example,the present situation of geological hazards in the area is analyzed,and the risk of geological hazards caused by the project construction is forecaseted and evaluated.It is considered that the hazard degree of karst collapse in construction project is small,and the hazard possibility is also small.According to the different types of geological hazards in the assessment area,the risk area is divided into three parts:the large risk area,the medium risk area and the small risk area.Based on the above analysis results,the measures for the prevention and control of the geological hazard of the slope collapse of foundation pit and the geological hazard of karst collapse are discussed respectively,so as to provide certain reference for ensuring the safety of the following project constrution in the area.
    Safety Analysis of Roadway Driving under the Influence of Remaining Coal Pillars and Faults
    Shen Jianbo, Cheng Gang et al
    2020, 36(06):  182. 
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    Study on Forced Caving Technology by Directional Hydraulic Fracturing for Thick and Hard Roof
    Liu Xue, Li Hongyan et al
    2020, 36(06):  185. 
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    Analysis of Water Gushing in a Mine and Comparison of Drainage Schemes
    Zhang Weilong
    2020, 36(06):  190. 
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    Study on Influence of Underground Mining on Stability of Yixiantian Return Air Shaft
    Wang Jiangui, Yang Bajiu
    2020, 36(06):  194. 
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    Application of Combined Support in Broken Rock Drilling Chamber
    Wang Fuquan, Chang Hong et al
    2020, 36(06):  200. 
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    联合支护 破碎 条形矿柱 长锚索 注浆
    Wellbore Freezing Technology for Large Flow and High Velocity Runoff Water Formation
    Chen Ke, Hao Hongsheng, Tang Tiejun
    2020, 36(06):  203. 
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    Geological Environment Remediation and Ecological Restoration Program Investigation of Abandoned Mines in BeijingTianjinHebei Area
    Li Qintao, Peng Tao, Yang Jian, He Jianqi, Wang Jianwei
    2020, 36(06):  205. 
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    The BeijingTianjinHebei region is an important economic growth pole in China.Mine mining provides material support for regional construction,but it also left serious mine geological and ecological environmental problems such as crag,earth′s surface sinking,exposed bedrock,decreased vegetation coverage,and dust.In order to promote the coordinated development of the BeijingTianjinHebei region and construct a "capital water conservation function zone and ecological environment support zone",the geological environment management and ecological restoration situation of abandoned mines in the BeijingTianjinHebei region is urgent.Took the eastern mining area of Sanhe in Langfang City,Hebei Province as an example,analyzed the geological and ecological environment problems in the abandoned mining area,combined the regional natural conditions and ecological environment,proposed detailed targets for mine restoration,and proposed a complete set of technical solutions.The study provides technical support for the mine restoration in the BeijingTianjinHebei region,and provides a reference for regional mine restoration and environment improvement.
    Study on Coal Gangue Comprehensive Treatment Mode of Tunlan Mine
    Lu Genling, Zhang Bo, Wang Yibin, Gong Youshou, Li Guangqiang, Gu Jiang, Wang Weipeng
    2020, 36(06):  209. 
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    According to the guidance of the integrated management mode of coal gangue piles,based on the local climate,soil and coal gangue fire characteristic of Tunlan Mine,the whole process of temperature measurement,fire prevention and reignition,mountain plastic and vegetation restoration are carried out systematically,the spontaneous combustion of gangue piles is effectively inhibited,at the same time,the content of heavey metal elements in the surface soil and shallow groundwater of the mining area are also decreased significantly,the ecological environment of gangue mountain is restorted effectively.The above comprehensive management mode of coal gangue in the mining area has certain reference and guiding significance to the management of coal gangue in the main mining areas in China.
    Investigation and Influence Analysis of Abandoned Mines in Zhejiang Province
    Dai Jiasheng
    2020, 36(06):  216. 
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    Study on Geological Environment Evaluation and Control Measures of Zhaishan Abandoned Lime Mine
    Ma Yanmei, Wang Qichao et al
    2020, 36(06):  220. 
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    Design Optimization of Efficiency Improvement of High Sulfur Flue Gas Desulfurization #br# System for Large Pellet GrateKiln
    Zhou Yinggui
    2020, 36(06):  224. 
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    A 2 million t/a graterotary kiln flue gas desulfurization unit is based on a single tower single cycle limestonegypsum wet flue gas desulfurization technology.With the promotion and implementation of ultralow emission in the steel industry,the existing desulfurization devices cannot meet the new environmental emission requirements,so the original desulfurization system needs to be improved.The reconstruction using single pylon dual cycle limestonegypsum wet desulphurization process,on the basis of the original desulfurization absorption tower increased partition spray after lifting,and increase the spray layer,the outside of absorber tower increase new external loop slurry box,and the cycle of form a complete set of slurry pump,as well as the process water system for pulp,the limestone slurry preparation system,compressed air system and gypsum dewatering system renovation design of related.After the efficiency enhancement transformation of the desulfurization system according to the optimized design,the SO2 concentration at the desulfurization tower outlet is no more than 35 mg/Nm3,and the droplet emission concentration is no more than 50 mg/Nm3.After the implementation of the project,the emission concentration of sulfur dioxide has been greatly reduced,reaching the ultralow emission standard,and the environmental benefits are very obvious.
    Studies on Kinetics,Thermodynamics,and Mechanism of Adsorption of Complexation Copper by Sludge
    Jia Peng, Wang Xiong, Chen Jun
    2020, 36(06):  227. 
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    Adsorption process of complexation copper onto sludge was investigated by balance oscillation method.The properties of kinetics and thermodynamic were analyzed by related equations and adsorption mechanism was characterized by BET、FTIR、SEM.The results show that adsorption balance occurr on 18 h and the removal rate of total copper is about 80%.Pseudosecond order kinetic model better described adsorption data.Langmuir model is appropriate for isothermal adsorption process.The result of BET shows that structure of sludge is microporous.—OH,Amides,COO-are observed through FTIR which might serve as the main active groups for adsorption.Metal sediment can be observed on the surface of sludge after adsorption by SEM.Adsorption mechanism including complexation and surface precipitation.
    Solidification Treatment Technology of Solid Wastes Containing Heavy Metals
    Yang Minglu
    2020, 36(06):  231. 
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    Application of Three-dimensional Desulfurization Tower Design with SolidWokks
    Fu Shihai et al
    2020, 36(06):  239. 
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    Overview of the Preparation Process of Black Glassceramics from Iron Tailings
    Wang Ming
    2020, 36(06):  252. 
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    SiO2Al2O3CaO series black glassceramics were prepared by sintering method from Yuanqu iron tailings.Mainly expounds the preparation technology of iron tailings black glassceramics,and summarizes a set of practical production methods according to the problems and solutions in the actual production process.It also overcomes the difficulties of preparing,plate forming and high porosity of the plate.Finally,through a series of practical production process improvement,the iron tailings black glass with fewer pores and a pure plate color was successfully prepared.
    Application of RDL Series Cartridge Filter inBaihualing Concentrator
    Ma Xiao
    2020, 36(06):  255. 
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    Research and Development and Application of Gold Electrorefining New Process#br#
    Li Shangyuan et al
    2020, 36(06):  257. 
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