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    25 July 2020, Volume 36 Issue 07
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    Geological Characteristics and the Origin of Yanzhuang Iron Deposit in Pingyin County of Shandong Province
    Cheng Long
    2020, 36(07):  1-4. 
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    Yanzhuang iron deposit is located in the northern part of the Wenshang Dongping metallogenic belt.In order to explore the mineralization mark of the deposit，by studying the geological characteristics of the deposit,analyzing its genesis and summarizing the prospecting criteria,it is of reference value to the prospecting work in the area.The ore bodies occurred in shancaoyu formation,and their shapes are controlled by the basement anticline and appear as layered.Magmatic rocks destroy the continuity of the ore bodies.The Genesis of the deposit is a sedimentary metamorphic iron deposit related to Neoarchean volcanic activity and regional metamorphism.The metamorphic rock series and magnetic anomaly of Taishan Group are the prospecting indicators of this type of deposit.
    Geological Characteristics and Pospecting Citeria of Nb Deposits in Dazhuang Area, Fangcheng County,Henan Province
    Song Wei Yu Tao Kang Yali
    2020, 36(07):  5-9. 
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    The geotectonic position of the niobium mining area in Dazhuang,Fangcheng County,Henan Province lies across the south margin of the North China landmass and the North Qinling tectonic belt,it is located in the north side of LuanchuanWeimosi fracture.The structure of the earth′s crust is characterized by double layers of basement and caprock.The deposit is controlled by the alkaline rock belt of LuanchuanWeimosi fracture in the region.In order to analyze the geological characteristics and prospecting indicators of the niobium ore,on the basis of previous work and research,this paper summarizes the characteristics of strata、magmatic rock and geophysical and geochemical exploration in the mining area,and summarizes the characteristics of ore body delineation combined with gamma survey,analyzes the geological characteristics and prospecting marks of the area,which can provide reference for further prospecting work.According to the comprehensive analysis,the genetic type of the deposit is magmatic differentiation deposit,and the main ore prospecting indicator is the high alkaline rock mass.
    Geological Characteristics and Genesis of Shitoutan Copper Deposit in Hengyang Basin
    Tang Zhixiang Qin Zhiwei Li Hailiang Xiao Liang Huang Xinhua He Libing
    2020, 36(07):  10-12. 
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    Shitoutan copper deposit is located in the middle part of qinhang metallogenic structural belt，It belongs to the southern margin of Hengyang Basin.The metallogenic conditions in this area are superior，Because there are many large and mediumsized copper deposits along the periphery of Hengyang basin.In order to provide guidance for the exploration of copper deposits in Hengyang basin,the regional geological background and geological characteristics of the deposits are studied and analyzed.It is concluded that the copper deposits occur in the fading sandstone of the shenhuangshan formation of Cretaceous system.it is favorable to form highgrade copper ore bodies When the interlayer fracture zone develops.It indicates that the ore deposits are of deepseated materials or related to the brine of the basin,which belongs to stratabound lowtemperature hydrothermal sandstone Type copper deposits.
    Study on Development and Utilization Level of Gold Mineral Resources in Zhaoyuan City
    Lan Jianguo
    2020, 36(07):  13-16. 
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    In order to thoroughly implement the requirements of ecological civilization construction and promote the overall saving and efficient utilization of mineral resources,a comprehensive survey and evaluation of the development and utilization level of mineral resources was carried out in Zhaoyuan City in August 2019.On the basis of training and learning,the data of 2018 was collated and verified on the spot,and then a single mine evaluation and a multi mine evaluation were carried out,including mine evaluation and area evaluation.Evaluation,industry evaluation.There are 16 mines in Zhaoyuan City participating in the survey and evaluation.Compared with the benchmark index,the standard rate of single mine evaluation and multi mine evaluation is 100%.On this basis,the significance and existing problems of the investigation and evaluation of the development and utilization level of mineral resources are analyzed.
    Characteristics of Heavy Metal Content in Cultivated Soil of Wangmo County, Guizhou Province and their Influencing Factors
    Su cuilan Yang Le
    2020, 36(07):  17-19. 
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    With the rapid development of social economy,soil heavy metal pollution has become an increasingly concerned environmental problem.To prevent soil heavy metal pollution effectively，The surface soil of cultivated land in Wangmo County of Guizhou Province was taken as the research object,The content characteristics of heavy metal elements and their influencing factors were studied by classical statistical analysis and correlation analysis.The results show that,The contents of CD,Cr,Hg and Ni in cultivated soil in this area are higher than the national background values,which are mainly affected by the soil forming parent material.The average contents of CD,Cr,Hg and Ni are higher in the distribution areas of Devonian,Carboniferous and Permian carbonate rocks,and lower in the distribution areas of terrigenous clastic rocks.The research results provide a basis for the county′s cultivated land planting plan and agricultural product structure adjustment.
    Research and Application of Watertight Support Structure for Superdeep Mining Pit
    Han Guilei
    2020, 36(07):  23-26. 
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    The technical difficulty of mine geotechnical engineering under complex working conditions such as soilrock combination,blasting construction and underlying Goaf is often greater,which is one of the key research directions in the field of geotechnical engineering.Based on the Green Mine Construction Project of Sanshandao Gold Mine,the research on water stop technology of special support for super deep mining pit is carried out.After systematic research and scientific calculation,the composite supporting scheme of the footlifting occlusive pile+highpressure jetgrouted anchor cable is put forward,and no water leakage occurs in the supporting structure after the implementation,under the condition that the peak value of particle vibration velocity exceeds 8 cm/s frequently,the maximum displacement of pile body is 17.5 mm,which meets the safety requirement.The proposal and implementation of the compound supporting scheme of footlifting bitting pile+highpressure Rotary spray anchor cable not only enriches the design theory and construction technology of mine geotechnical engineering,but also provides reference for similar projects.
    Research on Optimal Timespace Connection of Automobiletoautomotive Beltdischarge Rock Transportation System in an Openpit Mine
    Sun Yongmao Zhang Qiang
    2020, 36(07):  27-31. 
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    China's large and mediumsized metallurgical openpit mines have entered the middle and late stages of mining,and gradually moved from shallow to deep.Most of the pioneering transportation methods are mainly based on automobile transportation.They will face long distances,low vehicle efficiency,and high operating costs.Restricting the development of mining enterprises.In order to explore the best spatiotemporal connection of an automobiletoautomotive beltdischarge rock removal transport system in an openpit mine,combined with the current status of a largescale openpit mine rock removal transport system in China,based on the rock formation schedule prepared by the mining enterprise,two types of transportation systems have been established the model of the cost of rock rowing operation draws on the rock rowing costs of similar mine belt transportation systems,calculates the rock rowing costs of the two rock rowing systems,and then uses the method of comparing projects with or without to establish a mathematical model of incremental investment profit indicators,which are obtained separately.Incremental investment profit indicators for each case,the obtained data are listed in the same table and the maximum value of incremental investment profitability indicators is found through comparison.The maximum point is the optimal time and space of automobiletoautomotive beltdischarge rock transportation system.
    Ellipsoid Drawing Theory′s Deficiency and the Connection with Quasiellipsoid Drawing Theory
    Wu Shiping Guo Jinping Li Jiaoqun
    2020, 36(07):  32-35. 
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    Drawing theory is the basis of draw managing,and the ellipsoid drawing theory is widely used in production practice,but there are some deviations.By analyzing the theoretical basis of the ellipsoid drawing theory,pointed out that the ellipsoid drawing theory can′t reflect the shape of draw body changed when release conditions changed,density field is contrary to the basic premise that loose medium is continuous media,the moving transition equations of practical loose body contrary to the law of conservation of mass,the velocity field equation of practical loose body is not complete,the speed of the moving boundary is uncertain and discontinuous.On the basis,this paper discussed the connection between ellipsoid drawing theory and quasiellipsoid drawing theory,pointed out that the quasiellipsoid drawing theory is conform to reality and can be tested by theory,it contains the rational kernel of ellipsoid drawing theory,and can give all equations of ellipsoid drawing theory when n=1,m=2.Quasiellipsoid drawing theory is the important development of drawing theory.
    Study on Safety Guarantee System of Small Coal Pillar Gobside Entry Driving of Fully Mechanized Caving Mining in Specially Thick Coal Seam Working Face
    Zhao Haibing Jia Yaya Sun Miao
    2020, 36(07):  36-39. 
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    Small coal pillar gobside entry driving is of great significance for roadway mine pressure management and safe and efficient mining of working face.Taking the small coal pillar roadway of 5305 tongxin mine as the engineering background,in order to ensure the smooth driving of the roadway,the safety risk sources during roadway driving were identified,,and the corresponding requirements were put forward from the aspects of monitoring mine pressure,the filling of the remaining chamber,water,fire and gas prevention,etc.,and safety guarantee system of small coal pillar gobside entry driving of fully mechanized caving mining in specially thick coal seam working face was established.Field practice shows that under the protection of the system,5305 small pillar roadway has realized safe and efficient driving,no safety concerns were found.
    Study on Support Technology of Thick Seam Mining Roadway in Jinshan Coal Mine
    Hao Yunlong Liu Yitao Wang Shiyong Zhang Chao Liu Hongjin
    2020, 36(07):  40-43. 
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    According to the characteristics of deep coal seam occurrence and large mining thickness in Jinshan coal mine,in order to ensure efficient production of coal mine safety,the permanent support of the mining roadway is mainly composed of bolt + anchor cable + mesh,the temporary support uses the ZLJ20 airborne temporary support.Thread steel resin bolts are used as support materials of the top and side roadways.17.8 mm×6 000 mm steel strand is selected for archer cable.4 mm diameter mesh reinforcement is selected for the top neting.The No.8 iron wire metal mesh is selected for the side netting.Based on the above support design,the design and installation technology of bolt,anchor cable and support net are studied and analyzed,which are of certain reference significance to ensure the safety and high efficiency of production.
    Construction Technology of Roller Compacted Rockfill Dam in Waste Dump of Mirador Copper Mine in Rainforest Area
    Yang Tao
    2020, 36(07):  44-46. 
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    With the development of social economy,how to deal with the waste soil and slag reasonably,orderly,economically and environmentally has become an urgent problem to be solved in the earth rock project in the heavy rainfall area.However,for the earth and stone works in the rainforest area,a large area of waste dump is often required to be set up for the disposal of soil and slag,which has the characteristics of "large quantity and concentration".In order to ensure the effective capacity of the waste soil,the waste dump is often set in the valley.How to ensure the foundation treatment,see page layer construction,layered filling and rolling is the key to the quality control of the dam construction in the rainforest area.Taking the mining industrial site Project of Mirador Copper Mine in Ecuador as an example,the project has a large amount of earth rock excavation work,and the project faces such outstanding climatic characteristics as long rainy season and high frequency of rain.The waste dump of the project is designed as a roller compacted rockfill dam,with an overall height of 84.8 m and a rockwork volume of 278 000 m3.This paper briefly introduces the characteristics and difficulties of the dam construction of 1 095 m waste dump,and describes the main key technologies adopted in the dam construction process to provide reference for similar engineering construction.
    Blasting Vibration Propagation Law of an Openpit Mine and Its Impact on Surrounding Facilities
    Wang Yu, Yi Haibao, Yang Haitao, Pan Zhuying
    2020, 36(07):  47-51. 
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    In order to reduce the impact of blasting vibration of an openpit cement limestone mine on the safety and stability of surrounding residential buildings,the relevant blasting vibration monitoring and data regression analysis were carried out.The results show that: through the fitting regression analysis of the blasting vibration data of the mine,the propagation law of the blasting vibration in the direction of huangjiawa settlement area,jieweng village,Luba village and mashanwa village is explored,and it can be concluded that the blasting vibration speed of the normal production blasting in the four directions of huangjiawa settlement area is less than the blasting safety code (GB 6722—2014),under normal circumstances,it will not cause damage to the residential buildings.According to the structural properties of the protected buildings in the open pit mine,the limit values of the maximum charge and the safe distance in the same section are put forward.The blasting area of the mine is divided into the controlled blasting area and the normal blasting area,so as to realize the safe mining of the mine and avoid the impact on the surrounding facilities.
    Numerical Simulation of the Law of Overburden Rockmovement in Largeangle Underhand Stoping
    Zhao Long
    2020, 36(07):  52-55. 
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    In view of the safety accidents caused by overlaying rock movement in the overlaying process of highdip coal seam,such as support toppling,conveyor sliding and roof crushing,etc.,take the 10428C working face of Huozhou coal electricity group co.LTD.Xinzhi coal mine as an example,FLAC3D numerical simulation software was used to analyze the mining characteristics of roof strata along the strike and tendency of working face.Results show that no matter along the strike or tendency of the working face,the vertical stress contour and displacement contour of the largeangle underhand stoping coal seam are asymmetric arch form.The support pressure and displacement value under the working face are greater than above generally,the overlying strata movement range expands rapidly in the middle and upper part.The plastic failure zone of the roof of the working face develops toward the roof,the damage range of the lower roof of the working face increases obviously.
    Test and Application of Steel Fiber Silicon Powder Concrete Shotcrete Support in Roadway
    Niu Longxuan Meng Qingxin Zhang Jiani Li Changqing Liu Wenqiang
    2020, 36(07):  56-59. 
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    To solve the problems of cracking of slurry and serious deformation of roadway in ordinary concrete shotcreting support,wet shotcreting steel fiber silica fume concrete was proposed.The effects of steel fiber content and shape,silica fume content and water reducer content on flexural strength of concrete were studied through experiments.Then,the optimum proportion of steel fiber silica fume concrete was obtained.It was applied to the shotcrete support of the return air inclined shaft in a mine.The results showed that the flexural strength of concrete improved by wavy steel fibers was much greater than that of straight steel fibers.The optimum incorporation rate of wavy steel fibers was 1.5%.The optimum content of silica fume was 10% of that of cement.The optimum dosage of water reducing agent was 0.6%.The feasibility of controlling the surrounding rock of roadway by steel fiber silicon powder concrete shotcrete support is proved by spray layer stress monitoring and surrounding rock deformation observation.
    Analysis and Research on Soft Rock Mining in Gangli Mine
    Shi Haiping Wang Shuai
    2020, 36(07):  60-63. 
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    The surrounding rock of Gangli Mine is weak and broken,and the ground pressure appears more and more intense with the mining depth extending,which seriously affects the normal mining of Gangli Mine.In this paper,through the study of softbroken wall rock mining in Gangli Mine,the factors and mechanism affecting the normal mining are analyzed, and the mining order is adjusted,so that the difficulty of softbroken Wall rock mining in Gangli Mine is fundamentally reversed,the key problem of ground pressure management is to select the stable surrounding rock,to arrange the slope and the joint roadway in the fully relieved pressure position,and to select the high stress area where the surrounding rock is broken.
    Study on Blasting Vibration Propagation Law of Luohe Iron Mine
    Cao Jianquan Sun Shiping
    2020, 36(07):  64-66. 
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    In order to study the influence of blasting vibration on the ground construction facilities in Luohe iron mine,the field test method is adopted,based on Sadovski formula and considering the influence of elevation difference.The data processing method of linear regression is adopted to fit the propagation law of underground blasting.The results can predict the impact of blasting scale and blasting position on private houses,and provide a basis for taking measures to control vibration in blasting.
    Optimization of Grouting Parameters for Section by Section Behind Ushaped Steel Wall in Deep Roadway of Jiaojia Gold Mine
    Meng Xiangkai Li Xiaofei
    2020, 36(07):  67-69. 
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    During the construction of deep roadways,due to the influence of three high and one disturbance factors,some broken roadways still suffered large deformation after being supported by Ushaped steel.In order to study the deformation repair scheme of Ushaped steel einforcement in deep roadways,monitoring the roadway displacement by setting monitoring points around the roadway,combining the deformation monitoring results of the field to classify the severity of the Ushaped steel deformation zone,and using the severity classification of the deformation zone to optimize grouting reinforcement Technical parameters,grouting reinforcement for Ushaped steel walls,and bolt stress monitoring of the roadway after grouting reinforcement.The data shows that the anchor stress has basically remained unchanged,and the roadway remains stable and reliable,achieving efficient and rapid excavation for subsequent similar highlands.Accumulated experience in rapid construction of roadway.
    Development Test of Lowcost Tailings Filling Cementitious Materials in Deep Well Mine
    Gao Yuqian Han Ruiliang Hu Yajun Zhao Shufang
    2020, 36(07):  70-72. 
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    In order to increase the supply of underground mines and reduce the cost of filling and mining,a new filling cementing material ratio test was launched around a tailings of a mine in eastern Hebei,blast furnace slag of a steel plant and the addition of an activator.Exploratory tests,slurry tests,and cementsand ratio test shows that the 1∶7 cementsand specific strength of the newly developed filling cementitious material is three times that of the same ratio of 42.5R cement,and its price is 60%~ 70% lower than that of ordinary portland cement.It fully meets the requirements of the mine filling process,can achieve the purpose of improving the mine′s economic benefits and saving production costs,and at the same time it has a good role in promoting environmental governance.
    Design of Support Parameters for Thick Rock Softrock Roadway in Mindong No.1 Mine
    Shao Li
    2020, 36(07):  73-75. 
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    In order to solve the problem that the straight wall semicircular arch section of Mindong No.1 Mine has a slow boring speed and cannot be used with the excavating and anchoring machine,it is urgent to modify the roadway section design to rectangular.Based on the geological conditions of I0216301 transporting thick soft coal along the trough,the elastoplastic method,pressure arch method,field measurement and numerical simulation were used to determine the maximum damage range of the roof when the rectangular section was used,which were 2.53 m,2.87 m,2.40 m,and 2.45 m,finally taking the pressure arch calculation data as a reference,considering 2 times the safety factor,it is proposed to use "19 core 17.8×8 300 mm anchor cable+20×2 500 mm lefthanded and other strong rebar steel anchor+metal mesh+steel belt "Support plan for joint support.
    Design of Reinforced Concrete Artificial False Roof in a Mine
    Yang Jiufu Zhang Xiaobo Li Xiaogang
    2020, 36(07):  76-78. 
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    Underground mine stope top pillar refers to the protective ore body set up in order to ensure safety between top stop mining level of stope and floor of the transportation roadway in the upper adjacent stage.For the mine with stable roof and floor surrounding rock,high value of ore resources and lack of filling materials,the retention of roof pillars will inevitably cause unnecessary waste of resources and bring great economic losses to enterprises.And besides,due to the complexity of geological conditions,the limitations of underground operations and the damage of blasting,ore pillars often fail to give full play to their design role.A reinforced concrete artificial roof structure for the underground mine was designed by means of stress state analysis,theoretical calculation.Through cost and economic benefit calculation,the cost of artificial reinforced concrete roof is 0.8 million yuan,and the resource value of the replaced ore roof pillar is 2.64 million yuan,which has good economic benefits.
    Technical Practice of Passing the Old Roadway in the Fully Mechanized Mining Face with Large Dip Angle and Large Mining Height in Huashan Coal Mine
    Wang Gang Chen Qianfa Liang Guodong Cong Xingwei Yang Shiping
    2020, 36(07):  79-81. 
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    The 6143 working face is a fully mechanized mining face with large inclination and high mining height in Huashan Coal Mine,which is difficult to mine and has complicated geological conditions.In order to ensure the safe mining of the fully mechanized mining face,before the mining of the working face,survey the surrounding small kiln,prepare the design of water exploration and discharge,and improve the relevant plans and technical measures.Technical management,such as management,eliminates hidden dangers such as water,roof and toxic and harmful gases that may be encountered during the construction process,ensuring that the 6143 highinclined and highmining fully mechanized mining face safely passes the old lane.Through this practice,a lot of valuable experience is summarized to provide a technical basis for the future comprehensive mining working face to pass the old lane.
    Stability Analysis of South Slope of Panzhihua Zhu Mine Based on Kinematics
    Wu Jiangwei Wu Pengchen
    2020, 36(07):  82-84. 
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    After the open pit mining,a multistep high and steep rock slope is formed.Structural plane are exposed and control the stability of rock slope.Kinematics analysis,which are composed of stereo projection and vector algebra,is widely applied to the stability of rock slope controlled by structural plane.Taking south slope of Panzhihua Zhu Mine as an example in paper,slope is analyzed by kinematics through DIPS software,The results show that the south slope is easy to form wedgeshaped sliding when it is cutted by the dominant joint planes,and the slope is easy to form largescale plane sliding when it is combined with the through joint plane if there is a flow plane.
    Application of AHPFuzzy in Optimization of Residual Mining Project
    Yang Yunshu
    2020, 36(07):  85-87. 
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    In order to discuss the scheme of recovering the remaining lowgrade ore bodies at the edge of the original stope in Taibai Gold Mine,through the analysis of AHP and FUZZY theory,9 factors that have a significant impact on the residual mining project were selected and optimized.The model uses the analytic hierarchy process to determine the weight of each evaluation index.The fuzzy mathematical method is used to analyze and calculate the qualitative and quantitative indicators of each mining method to obtain the membership degree of each evaluation index.Finally,the comprehensive preference of the three engineering layout schemes is calculated.They are 68.1%,69.3%,and 58.1% respectively.Therefore,the twopath layout along the ore body is determined as the optimal mining plan.Practice has shown that the optimal engineering layout scheme using this model is scientific and reasonable,and it is worth learning and promoting.
    Flood Regulartion Calculation of Tailings Pond
    Su Weiqiang
    2020, 36(07):  88-91. 
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    Flood regulartion calculation is very important in the design and operation management of tailings pond，and water balance is regarded as a common calculation method which involves many interpolation calculations and trial calculations.In order to improve the computational efficiency and quality,by using Excel's powerful data processing capabilities and VBA programming method,it can achieve the calculation process automatically.It's the way to reduce the influence of labor in interpolation and trial calculations and improve the work efficiency.Moreover,the calculation process is clear and versatile.
    Practice of Support Crushing Measures in Fully Mechanized Face of Mediumthick Coal Seam of Gaizhou Coal
    Long Fengkui
    2020, 36(07):  92-93. 
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    As the influence of mining from up to down of No.15 coal seam in No.9101south fully mechanized face of Gaizhou Coal.Breaking of main roof ahead of workface has resulted in hysteresis breaking of goaf main roof,the increased weighting interval and hanging area,delayed caving of immediate roof.That has caused decreasing of power stroke of support column and support crushing.In order to reduce the occurrence of support crushing,This paper introduces general situation of No.9101south fully mechanized face,process of support crushing,reason of support crushing,measures of support crushing,experiences of support crushing,which has reference value under similar coal mines.
    Research on Cluster Pillar Support Technology of Coal Mine Integral Base
    Ma Guohong
    2020, 36(07):  99-101. 
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    Application of Flotation Reagents at Room Temperature in Lilou Iron Mine of Anhui
    Wang Tao
    2020, 36(07):  107-110. 
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    In view of the problems of environmental protection pressure and high production cost in Lilou Iron Mine specularite flotation exposed when using heating flotation reagent.The concentrator has carried out a series of new processes,the application of new equipment and process optimization transformation,which provides the necessary conditions for the use of room temperature flotation reagents.On the basis of repeated tests and optimization of various agents,Anshan TD collector was finally selected,which reduces the temperature of flotation pulp from above 35 ℃ to 16 ℃.The annual heating cost of natural gas can be saved 8 million yuan under the condition of slightly better production index and slightly lower chemical cost,and the environmental benefit is significant,which has certain reference significance for similar domestic concentrators.
    Experimental Study on the Beneficiation of a VanadiumTitanium Magnetite in Canada
    Li Weiwei
    2020, 36(07):  111-115. 
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    A vanadiumtitanium magnetite ore in Canada with TFe grade of 42.56%,TiO2 grade of 10.65%,V2O5 grade of 0.33%,and Cr2O3 grade of 1.22%.The metal minerals in the ore are mainly titanium magnetite and ilmenite,which are mostly useful elements are stored in titanium magnetite.In order to determine the development and utilization process of the ore,a beneficiation test was conducted.The results show that take the twostage grinding and stage low inteisity magnetic separation process can obtain an iron concentrate with TFe,TiO2,V2O5,Cr2O3 grades of 52.76%,10.21%,0.42%,1.64%,and recovery rates of 87.14%,67.38%,89.45%,93.91% respectively.The low intensity magnetic separation iron tailings adopt the high intensity magnetic separation+gravity separation titanium separation process can obtain a titanium concentrate with TiO2 grade of 47.03%,and the recovery rate of the relatively low intensity magnetic separation iron tailings is 7.34%.
    Experiment Study on Producing Super-Grade Iron Concentrate Using an Iron Ore from Fushun
    Li Mingyu Huang Jinfu Jiang Lijun Wang Wenlong Wan Jiaguo
    2020, 36(07):  116-120. 
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    In order to determine the technological process of producing super iron concentrate from a magnetite ore in Fushun,the beneficiation test was carried out.The high pressure roller mill closedcircuit rolling(wet screen)coarse particle low intensity magnetic separationgrinding classificationlow intensity magnetic separationpre classificationgrinding classificationlow intensity magnetic separationflotation process was adopted in the test.When the working pressure of high pressure roller mill is 8.5 MPa,the grinding fineness of first stage is -0.075 mm accounting for 65%,high frequency fine screen of highgrade iron concentrate with a width of 0.075 mm,the regrinding fineness of tower mill is -0.038 mm accounting for 90%,high purity iron concentrate via one roughing two cleaning cationic reverse flotation,the amount of dodecylamine added in different stages is 16.37+8.18+3.27 g/t,it can be obtained that: high grade iron concentrate with iron grade of 68.01% and total iron recovery of 86.21%;high purity iron concentrate with total iron grade of 70.95% and total iron recovery rate of 42.32%,byproduct iron concentrate with total iron grade of 65.40% and total iron recovery rate of 43.89%;super iron concentrate with total iron grade of 71.81%,total iron recovery rate of 17.93%,acid insoluble content of 0.14%,byproduct iron concentrate with total iron grade of 67.08% and total iron recovery rate of 68.28%.
    Experimental Research of Mineral Processing on Rare Earth Ore from Gansu Province
    Liu Fang, Hu Zhenfeng, Su Jianfang, Wang Zhongming,
    2020, 36(07):  121-124. 
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    The contents of REO are 1.92% in rare earth mine of GanSu province.The fineness of rare earth minerals calcium oxysilica,direct fluorocarbon calcium cerium ore,fluorocarbon calcium cerium ore is very fine in ore,the weighted average of REO is 54.88% in these minerals,which means the theoretical content of REO is only 54.88%.The experimental researches of minerals processing were carried out,which determine the flowsheet to development and utilization the ore.The results shown: high intensity magnetic separation and gravity concentration are not fit to throw away tailings in advance for the ore.The flowsheet of rough grindingflotationregrindinghigh intensity magnetic separation was use to process the ore.The grade and recovery of rare earth concentrate and rare earth secondary concentrate are 23.89%,64.70% and 532%,11.62% respectively,the total recovery of rare earth is 76.32%.Due to the grade of REO in concentrate,the tests should be needed to upgrading and reducing impurities in the future.
    Test of High Sulfur Iron Concentrate Desulfurization by Reverse Flotation
    Zhang Jianchao
    2020, 36(07):  125-127. 
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    The iron concentrate produced by a highsulfur copper ore mine in Jiangxi has a fineness of -75 μm accounting for 72.51%,and the iron grade is only 62.36%,but the sulfur content is as high as 187%.Sulfur mainly exists in the form of pyrrhotine and pyrite.Magnetite and pyrrhotine or pyrite have varying degrees of metasomatism,continuous growth or trap.In order to solve the problem of high sulfur content in iron ore concentrate,reverse flotation desulfurization test was carried out.The results show that the sample is processed by two reverse flotation rough separation processes with a regrind fineness of -45 μm accounting for 7068%.The rough flotation 1 sodium fluorosilicate dosage is 300 g/t,amylxanthate dosage is 250 g/t，2# oil dosage is 30 g/t，and the rough flotation 2 sodium fluorosilicate dosage is 100 g/t,amylxanthate dosage is 100 g/t，2# oil dosage is 10 g/t.The final iron content of the concentrate is increased to 6403%,and the sulfur content is reduced to 039%,which solves the problem of high iron content in the iron concentrate.
    Enhancement on the Flotation of Artificial Galena and Its Mechanism
    Zhang Xiaoming Xu Yonghua Wang Zhen
    2020, 36(07):  128-130. 
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    The recovery of lead from leadzinc slag is becoming more and more urgent.commonly,the Pb element is changed into galena by crystalline phase control and then floated as concentrate.However,the traditional xanthate collector is weak in collecting the synthetic galena.It was found that the flotation could be improved by a new mixed collector.The mechanism of flotation enhancement was studied by means of flotation,dynamic potential,adsorption capacity and molecular dynamics simulation.The results show that the floatability of the synthetic galena was poor when the amyl xanthate was used as collector,but the flotability was improved using mixed collector.The results of dynamic potential measurement,adsorption capacity detection and molecular simulation show that the different components of the mixed collector promote each other's adsorption on the surface of the synthetic galena,so the flotation is strengthened.
    Experimental Study on Flotation Desilication of a Low Alumina Silica Ratio Bauxite in Guizhou
    Liu Anrong Peng Wei Wang Zhenjie Liu Hongbo
    2020, 36(07):  131-133. 
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    A low alumina silica bauxite ore in Guizhou Province has Al2O3 grade of 60.35%、SiO2 content of 13.53% and alumina silica ratio of 4.46.The aluminous minerals are mainly diaspore,and the siliceous minerals are mainly kaolinite,illite,chlorite.In order to determine the development and utilization process of the ore,the beneficiation test was carried out.The results show that the ore sample has been treated with one roughing and one scavenging under the condition that the fineness of the first stage grinding is -0.074 mm content 74.52%.When the regrinding fineness of the coarse concentrate is -0.053 mm accounting for 87.65%,it is treated by one roughing three cleaning two scavenging,and the middle ore returns to the closedcircuit positive flotation process in sequence for desilication,The bauxite concentrate with Al2O3 grade of 67.49%,alumina silica ratio of 8.81 and Al2O3 recovery of 78.04% is obtained.The desilication effect is significant,which provides a basis for the next stage of work.
    Experiment on Beneficiation of an Iron Ore in Hami,Xinjiang
    Wu Peng et al
    2020, 36(07):  139-141. 
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    Experimental Research on Purification of Diatomite in Yunnan
    Yu Futao et al
    2020, 36(07):  142-143. 
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    Application of High Pressure Roller Mill in Open Circuit Crushing Process
    Wang Lei Zhang Ji'an Sun Shujin Man Yufeng
    2020, 36(07):  145-146. 
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    Experimental Research on a Manganese Ore in Xinjiang
    Guo Shunlei et al
    2020, 36(07):  147-149. 
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    Comparison between Conventional Flotation and Active Bubble Flotation of a Fine Niobium Ore in Hubei Province
    Liu Shuang Zhu Dan Kang Jian Lin Fan Huang Peng Li Jian
    2020, 36(07):  150-152. 
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    Experimental Study on Dry Separation Technology of Beishan Ore in Nanfen Concentrator
    Huo Yan Xiao Qifei
    2020, 36(07):  153-154. 
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    Study on Process Mineralogy of a Refractory Lean Magnetite Ore in Shandong
    Xiong Jian
    2020, 36(07):  158-161. 
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    Recovery Experiment of Magnetite from an Iron Ore in Inner Mongolia
    Wang Haoming Zhang Chenglong
    2020, 36(07):  162-164. 
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    Experimental Study on Flotation of a Primary Flake Graphite Ore
    Zhang Shuai Li Ya Niu Yanping He Zhanghui Chu Jingbo
    2020, 36(07):  165-167. 
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    Comparative Test of a Hematite and Limonite Ore Processing Technology in Henan
    Zhang Gaojie Bi Kejun
    2020, 36(07):  168-170. 
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    Design and Application of Waterproof Hammer Controlled Gate Valve for Underground Automatic Drainage
    Sun Erting
    2020, 36(07):  171-173. 
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    When the mine water is not discharged properly and reasonably,it is easy to produce water hammer and cause more problems.In order to prevent water hammer,relevant technicians should follow the closedloop theory,reasonably control the closing speed of gate valve,and adopt the controllable gate valve design mode.In order to further verify the actual effect of the controllable gate valve,the hydraulic system model of the numerical simulation software is established.The investigation and simulation results show that the servo control valve can achieve the effect of reasonably controlling the closing speed of the gate valve,and the controllable waterproof hammer gate valve has good stability,which provides more support for the later equipment selection.
    Application of Antifalling Explosive Plugging Blasthole in Equipment Charging of Underground Mine
    Zhang Guosheng Yang Wei Li Xiaodong Tian Ye
    2020, 36(07):  174-175. 
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    At present,most of the underground mines use the field mixed emulsion explosive truck to load the explosive upward into the blast hole,when the blast hole contains water,it is easy to cause the rapid overall fall of the explosive column,resulting in many drawbacks and problems.Through a variety of onsite program tests,the selfdeveloped plugging equipment with quick and highstrength selflocking effect in the blasthole is used to effectively prevent the falling effect of the charge in the watery blasthole,thus ensuring the charging and blasting effect of the upward blasthole and reducing the blasting production cost,which is worth popularizing and applying.
    Development on the Command System for Auxiliary Transportation of Rubber Tyred Vehicle in Sanjiaohe Coal Mine
    Bai Jianmin
    2020, 36(07):  176-178. 
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    In order to improve the operation efficiency and safety reliability of trackless rubberwheel vehicle dispatching in sanjiaohe mine,By studying and analyzing the auxiliary transportation system and mining area layout of the mine,Using radio frequency,network communication and other technologies.The auxiliary transport dispatching command system of rubber wheel vehicle was developed.Practical application shows that: The system is designed for vehicle positioning,signal light blocking,antirearend and other functions,And the software design architecture and key system design is reasonable,Realized automatic vehicle scheduling,Further improve the mine transport safety management level.
    Improvement of High Voltage Collector Ring of WK20 Excavator in a Mine
    Duan Shufa Zhang Xiaochuan Zhang Shuwei
    2020, 36(07):  179-181. 
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    WK20 excavator is a semiclosed space because the highvoltage collecting ring of the inlet line is between the rotating upper and lower platforms.In addition,the lubricating oil of the rotary ring is thrown into the highvoltage collecting ring when it is working,which causes hidden trouble to the safety of the equipment,at the same time,the platform and the ring rail are worn,which reduces the elastic space of the collector ring shoe and adversely affects the safety and service life of the ring.In order to solve the hidden trouble of the equipment and increase the service life of the ring,the scheme of installing the highvoltage collector ring in the upper platform and the lowvoltage collector ring together was worked out.Through the improvement,the hidden trouble of the equipment safety is eliminated,the service life of the ring track is increased,which is of great significance to the company′s equipment safety management and cost management.
    Application of Wireless Ethernet Technology in Peripheral Drive Thickener
    Wang Xingxing Liu Fuxing Zhou Changyin
    2020, 36(07):  187-190. 
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    Application and Maintenance of KGLF-2 Synchronous Motor Excitation Device
    Lin Rushan
    2020, 36(07):  191-194. 
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    Application Research on Bi-Metal Composite Liners in Wear Chamber of Rotary Crusher
    Wang Yuehui et al
    2020, 36(07):  198-201. 
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    Burning-proof Reformation of High-voltage Synchronous Motor
    Liao Zhiqiang Zheng Xuejun
    2020, 36(07):  202-203. 
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    Research Status and Development on Prevention and Control Key Technology of Sulfide Ore Spontaneous Combustion in China
    Zhao Yu Guo Zhiguo Liu Zuwen Wang Rong Zhou Lingjian
    2020, 36(07):  204-208. 
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    In order to provide decisionmaking basis for the development of selfignition disaster prevention and control technology in metal mines in China,according to the research status of spontaneous combustion and prevention and control technology of sulfide ore in recent years,the key research fields such as spontaneous combustion mechanism,prediction and forecast technology and comprehensive treatment technology of sulfide ore are systematically expounded.In view of the current status of spontaneous combustion disasters in metal mines and the development of metallurgical industry,key scientific issues such as spontaneous combustion mechanism of sulfide ore,accurate detection of fire source location,the monitoring,detection and early warning technology,the fire prevention and extinguishing material technology and equipment,and to improve the control efficiency would still be the key exploration and development directions;The sustainable development of sulfide ore spontaneous combustion disaster prevention and control technology is of great significance for ensuring the safe production of metal mines and promoting ecological environmental protection.
    Application of Multifunctional DustDepressor in Openpit Mine Parement
    Li Junjie Yuan Yong Cao Jinjun Wang Kun Gao Hailong Hao Yafei Leng Zhengdong
    2020, 36(07):  209-211. 
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    In order to discuss the application effect of multifunctional dust suppressant in openpit mine pavement,a multifunctional composite dust suppressant with low raw material price,simple processing technology,safety and environmental protection,and good moisture absorption,moisture retention,and coagulation performance was introduced.The field application effects of the iron ore,coal mine,limestone and other types of openpit mine transportation pavements were tested,and their economic benefits were evaluated.The test results show that the multifunctional composite dust suppressant has a significant dust suppression effect in 3 different types of openpit mines,and has a certain dust suppression period.Among them,the dust suppressant solution has the highest dust suppression efficiency in the test of openair iron ore transportation pavement ( 98.3%) and the longest dust suppression period (8 d).On the surface of openair limestone mines,the dust suppression efficiency and dust suppression period can also reach 96.4% and 5 d,respectively.According to the analysis of economic benefits,compared with the traditional sundust suppression method,the multifunctional composite dust suppressant has obvious watersaving effects and significant economic benefits,and has certain application prospects.
    Consideration and Discussion on Green Mine Construction Plan of Chentaigou Iron Mine
    Ma Zhongli
    2020, 36(07):  212-214. 
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    In order to build the Chentaigou Iron Mine into a nationallevel green mine,relevant analysis was carried out from the relevant policy requirements for green mine construction,the green mine application management process,and the Chentaigou Iron Mine′s green mine plan planning and exploration.Specific measures such as environmental protection,mining process selection,energy conservation and emission reduction,comprehensive utilization of resources,intelligent mine construction,and harmonious enterprise land during the construction process provide a reference for the green mine construction path of the Chentaigou Iron Mine.
    Application of Water Source Heat Pump in Underground Mine
    Feng Yingbo
    2020, 36(07):  215-216. 
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    In order to improve the quality and efficiency of coalfired boilers,an iron mine decided to transform its coalfired boiler into a water source heat pump air conditioning system by analyzing the actual conditions and economic comparison of the mine.The total investment of the project is more than 13 million,which took four months to complete.Through the before and after comparison,it can be seen that the water source heat pump air conditioning system has played a role of energy conservation and emission reduction,environmental protection and high efficiency.The correct promotion and use of water source heat pump will have a profound impact on the energy conservation and emission reduction in China.
    On the Construction of Water Control and Prevention System in Qixiashan Lead Zinc Mine
    Wang Wei Xiong Dongquan Jiao Peng
    2020, 36(07):  217-220. 
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    At present,Qixiashan lead zinc mine has been mined to the middle section of -725 m,and the hydrogeological conditions have changed to some extent.In order to prevent water inrush accidents in the mine,the mining enterprises have formed a set of relatively perfect water control system from many aspects,such as the formulation of water control system documents,the strengthening of hydrogeological investigation and research,the improvement of hydrogeological drawings and accounts,and the establishment of drainage system with the required capacity.Practical application shows that the system plays an important role in checking the geological conditions of Qingshui and preventing water inrush accidents in mines.
    Present Situation Evaluation of Occupational Hazards in a Slag Powder Production Enterprise
    Wang Bingxing Liu Lei Zhu Jiangli Fu Xuehao Wang Tao
    2020, 36(07):  221-222. 
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    Research on Dstribution Law of Gas Flow Field and Buried Parametersin Goaf
    Xiao Yuhong Yan Xunqiang
    2020, 36(07):  223-225. 
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    According to the problem of the gas content over limit frequently in the upper corner of the U type ventilation in the underground mine and seriously restricted the safety and efficiency of coal production,Through FLUENT simulation,the gas distribution in the minedout area under the condition of fully mechanized mining in Mabao Coal Industry was obtained,and the gas flow field distribution rule in the minedout area was studied.Combined with onsite experimental investigation,the guiding gas migration rule in the fully mechanized minedout area and reasonable buried pipe parameters in the minedout area were obtained.
    Investigation on the Distribution Law of High Temperature Heat Damage in a Mine in Guangxi
    Mo Supeng, Chen Lei
    2020, 36(07):  226-228. 
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    In order to study the distribution rule of high temperature heat damage in a deep well in a mine in Guangxi,the temperature of the main production operation area of the mine was measured,and the analysis and research were performed based on the measurement results.The results show that the change in underground temperature of the mine and the depth of the mine do not show a simple linear increase in the proportion,and the temperature increase value in the deeper area is relatively more obvious.Should cooperate with mechanical cooling and other means to further control the deep areas.
    Ventilation System of Infrastructure Construction in Erdaohe Mining Area of Dahongshan Iron Mine
    Gao Wei
    2020, 36(07):  229-232. 
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    The mine ventilation system relies on the development system to serve production operations,and has the dual attributes of stability and dynamics.Ventilation system optimization not only depends on its own way of development,but is also closely related to its associated ventilation system.Aiming at the special period of the construction period of the mine during the construction period,the ventilation roadway is gradually improved,the system lacks throughair flow,and serious pollution and wind are connected in series.Researches on the optimization and application of the ventilation system during the infrastructure period are carried out.Taking the Dahongshan Iron Mine Erdaohe mining area as the engineering background,the Ventsim ventilation simulation software was used to establish a digital model of the ventilation system.The roadway database was established by collecting field parameters from the field measurements.The results of the scheme,simulation system establishment,parameter determination and fan performance measurement mutually verify its scientificity and feasibility.
    Application of Key Technology for Rapid Driving of Large Section Coal Roadway
    Cao Shuai
    2020, 36(07):  247-248. 
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    Study on Compressive Properties of Mineral Polymer Based on Blast Furnace Slag
    Yang Minglu
    2020, 36(07):  257-258. 
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