Modern Mining

Construction Rock Materials and Sands Supplydemand Analysis and Advice on Future Industry Planning of the Guyuan Area,Ningxia

ZHANG Yuyuet al

2020, 36(10): 1.

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Sustainable Development Strategy of a Large Open Pit Mine Near the City

GAO Yijun et al

2020, 36(10): 3.

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Analysis and Measures to Reduce Cost and Increase Efficiency in Nanfen Open-pit Iron Mine

ZHANG Jianpeng, LI Lanbin , TIAN Zhicheng

2020, 36(10): 5.

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Study on Green Exploration Technology System of Uranium in the New Era

HUANG LezhenCAO HaojieHUANG HailingLI JunZHANG YueyueWANG Zhi

2020, 36(10): 7.

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Implementing green uranium exploration is the brandnew exploration mode under the strategic background of ecological civilization in the new era,and also the inevitable requirement to ensure national security and energy security.The concept of green is introduced into uranium exploration,and the purpose,principle,concept,technical means and work flow of uranium geological exploration are innovated so as to obtain better exploration results and geological information with minimum environmental and economic costs.On the basis of the perfect theoretical system of uranium exploration,the concept of "innovation,coordination,green,open and sharing" is introduced,and appropriate exploration engineering technology is selected according to the current exploration standards.A new era of green uranium exploration is formed in five aspects:metallogenic theory,exploration engineering technology,exploration standard,environmental restoration and exploration evaluation.

Geology Characters and Ore Physical & Chemical Properties Study of Overlaid Area in a Bentonite Deposit in Liaoning Province

ZHAO Baisheng

2020, 36(10): 11.

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The north part of a bentonite deposit is overlaid in Liaoning Province.The exposure strata in the deposit,as slight dipping angle monoclinal structure,are Lower Cretaceous Yixian formation volcanicsediment rocks.There are 2 bedding ore body in pyroclastic rocks in the overlaid area,whose occurrence are same to the tuff wall rocks.The ore is remnant tuff texture,and contain a few of volcano matters.The author infers the deposit is a andesitic tuff sedimenthydrolysis type bentonite deposit.According CEC,XRD,colloid index and swelling volume analysis,the ore is Cabentonite,and has wide application prospect.

Geochemical Characteristics and Genesis of Guilin Chicken Blood Jade

LEI Rong, RUAN Qingfeng, SHA Xin, LI Qixiu, ZHANG Rong

2020, 36(10): 15.

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The major elements and rare earth elements of Guilin Chicken Blood Jade(GCBJ) from Shanglang and Pingye were tested and analyzed.The results showed that the SiO2 content of GCBJ is 8534%~98.10%,with an average of 93.59%.The content of TFe2O3 is relatively enriched,and the average w（Al）/w(Al+Fe+Mn) ratio is 0.19.Most of the samples fall on the Ferich end of AlFeMn Triangle diagram,showing the characteristics of hydrothermal sedimentary rocks.The content of REE in GCBJ is very low,δCe is 0.90~1.12,the average is 1.02,there is no obvious anomaly,the average value of δEu is 1.96,obviously positive anomaly,(La/Ce)N is 1.0 on average,which is different from the characteristics of rare earth elements in typical hydrothermal sedimentary rocks,but it shows that the formation of GCBJ is closely related to hydrothermal deposition,and is greatly influenced by hydrothermal activity.

Study on High Quality Development of Antimony Resources Industry in China

DONG Yantao, YUAN Bo et al

2020, 36(10): 19.

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Geochemical Characteristics of Stream Sediments and Metallogenic Prognosis of Xianghualing Area,Hunan Province

ZHOU NianfengLIU Xiaoxi

2020, 36(10): 22.

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Geological Characteristics and Prospecting Indicators of Yueyang Veined Ag-polymetallic Deposit in Wuping County

QIU Yongzhen

2020, 36(10): 27.

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Study on the Geological Characteristics and Mining Technical Conditions of Xinhui Gold Mine in Shandong Province

LIU Yunqiu, XIU Guolin, ZHANG Yuhua , XU Yongwen , XU Jingge , LI Guanbing, LI Zhengcan , YU Xiangbo, Xiao Yigai , Yin Yu , Guo Zhenpeng, Jing Lixiang, Pan Jian

2020, 36(10): 30.

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Discussion on the Slope Expansion Method of Stabilizing Production during the Transition Phase of Threestage Development in Gaocun Iron Mine

YUAN Yingjie, CHUAI Xin, CHEN Hongquan

2020, 36(10): 33.

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At present,Magang Gaocun Iron Mine is facing the status quo of the second phase project is about to reduce production.In order to extend the stable production life of the mine,it is planned to carry out the construction of the third phase project in the west of the stope.The thesis introduces the plan of the third phase mining in the stope.Combining the current status of the mine and the characteristics of mineral resources,the mining difficulties during the transition period from the second phase to the third phase are explained.The advantages and disadvantages of steep slope mining and gentle slope mining are compared and analyzed.It is pointed out that steep slope mining can balance the production stripping ratio and reduce peak stripping,which is a suitable expansion method for stable production in the transition period of Gaocun mine.At the same time,combined with the characteristics of the mine,it is recommended to use the goosetracking steep side mining scheme.The net present value of production cost is calculated according to the dynamic method.Under the condition of ensuring stable production in the transition period (20212027),the steep slope mining can save direct costs of 34.215 million yuan compared with the gentle slope mining,and the economic benefits are very significant.

Stress Distribution and Microseismic Rules of Zigzagtype Faultcoal Pillars with a Depth of 1 000 m

ZHANG XiuFengLU CaipingWANG ChaoWANG BaoqiZHOU TaoLI HuanHE Zhilong

2020, 36(10): 38.

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The high stress concentration in the upper coal pillar will lead to the increase of stress in the lower coal seam working face or roadway.The stress distribution in the coal pillar will become more complex due to the irregular shape of coal pillar,which makes the strata behavior regularity appear abnormal in different mining stages under coal pillar.Based on the upper Zigzagtype coal pillar encountered in the 7301 working face with a strong probability of rock burst of Zhaolou Coal Mine,through numerical simulation and field monitoring,the area affected by pillar in lower working face,the strata behavior regularity,the variation rule of microseismic (MS) energy and frequency were analyzed when working face advance to area affected by coal pillars.The results show that:①The stress peak value of coal pillar and Relative position of coal pillar and working face are the important factors to determine the influence range of coal pillar on the working face,coal pillar have the smaller influence on the working face with the smaller stress peak value and far away from the working face.②When the working face is close to the edge and the junction of coal pillar,the MS energy and frequency will reach the peak value,and the amplitude of corresponding MS large energy events will increase,the dominant frequency will decrease,and the main energy will be concentrated in the lowfrequency area.At this time,the working face has the highest risk of rockburst.③ According to the location of the source and the field depressurizing situation,it is determined that the stress concentration area is located at the area under the edge and the junction of the coal pillar.Therefore,the largediameter borehole should be adopted for reducing the stress concentration.

Study on the Characteristics of Multiparameter Precursory Signals of Strong Tremor

XIAO ZibinZHU YaweiCAO Xianmin

2020, 36(10): 42.

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In order to explore the precursory characteristics of strong tremor,based on the microseism and electromagnetic radiation technologies,tthe law of tremor appearance in the first section of the working face,which locates in the north No.17 seam of the third mining area of the Junde Coal Mine is studied,the strong tremor characteristics during the mining period of the working face is obtained.When the daily vibration energy and the number of events are maintained at a high level,it represents the symptom of strong tremor appearance and the pulse of electromagnetic radiation.Both impulse value and intensity are very small,indicating that there will be a large energy release soon,which is also the precursory signal of strong tremor.

Optimization of Blasting Parameters in Waterbearing Area of Barun Iron Mine

GUO Yi′naGUO Jianxin

2020, 36(10): 46.

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Presplitting blasting is a commonly used technology in metal mine,which can weaken the rupture of surrounding rock,weaken the destructive effect of blasting vibration on the slope of openpit mine,and maintain the stability of slope.In order to solve the problem of poor effect of presplitting blasting in water bearing area of Barun Iron Mine,based on the field geological survey and theoretical analysis,the optimization study of presplitting blasting parameters in water bearing area of Barun iron mine is carried out,and the ideal hole network parameters are obtained.The blasting effect is very ideal,which ensures the stability of the slope,and provides strong support for the presplitting blasting in the water bearing area of the mine.

Design of the Mining Method for the Gently Inclined Mediumthick Ore Body under the Thick Aquifer

YAN Jialong

2020, 36(10): 48.

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Combining the occurrence characteristics of the gently inclined mediumthick ore body in a certain mining area，comparing the economic and technical conditions of two mining methods,the mining method suitable for the ore body is selected as the subsection empty field with flat bottom structure and subsequent filling mining method，and the structural parameters of ore block and stope mining technology are introduced in detail.In order to reduce the engineering quantity of outofpulse mining and facilitate the passage of trackless equipment in the stope,the uphill from the ore is in a pseudotilted form,and most of the mining and cutting works are arranged in the veins.Compared with the subsection empty field subsequent filling mining method with a bottom trench,the cuttingtocut ratio is reduced by about twothirds,and the dilution rate is also reduced by about onehalf,with significant economic benefits.It has guiding significance for the mining of similar ore bodies.

Optimization of Process Parameters of Mediumdeep Hole Extrusion Slotting Blasting Without Cutting Well

LI HongyanYU Huajia

2020, 36(10): 52.

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The effect of cutting and blasting affects the efficiency of underground mining operations.In the process of underground mining of an iron ore,there is a problem that the effect of the slotting blasting without cutting well process is not good.Starting from the traditional blasting process,first test the swelling coefficient of the ore particles in the squeezed state,then optimize the blasting parameters through numerical simulation,and finally verify the calculated results by comparing the field blasting effect.It was found that adjusting the blasting resistance line from 1.2 m to 1 m can overcome the problem of insufficient compensation space in the traditional blasting technology.Numerical simulation found that the effective stress value of the furthest unit point in the direction of the resistance line during the blasting process is greater than 61.3 MPa of the dynamic compressive strength of the ore.At the same time,the stress wave generated during the squeezing blasting process has a squeezing effect on the ore,meeting the test requirements.The ore crushing expansion coefficient is less than 1.333,meeting the blasting compensation space requirements.The traditional line of resistance calculation formula is not suitable for slotting blasting without well,and the compensation coefficient K0 should be considered.After the blasting parameters were revised,a good blasting effect was achieved.This test provides theoretical and data basis for mining construction technology of slotting blasting without cutting well in underground mining.

A New Model for Vibration Prediction of Rock Slope Under Blasting Vibration#br#

LI Jingpeng

2020, 36(10): 57.

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The amplification and attenuation effects of blasting vibration in stepped terrain are important factors affecting the stability of slopes and structures.Establish a numerical model of the slope to study the generation and change law of terrain effect during blasting vibration.The test results show that there are obvious amplification and attenuation effects in the vibration velocity of the particle surface of the rock mass in the stepped terrain.The change characteristics of the amplification effect are closely related to the vibration frequency,and the attenuation effect is related to the rock clamp production and the vibration source distance.When the vibration frequency is low,the vertical vibration velocity of the rock mass point exhibits an amplification phenomenon,and the stepped terrain enhances this phenomenon.Considering the influence of elevation magnification factors and rockmass clamping factors on the blasting vibration velocity,the slope terrain vibration prediction formula is perfected.Provide conditions for engineering blasting construction design.

Analysis on the Displacement Characteristics of the East Slope of Open-pit Stope of Tongman Ore Section#br#

YANG Huaxiang, ZHANG Kunmei

2020, 36(10): 61.

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Study on the Integrated Treatment Measures of the Surface Collapse Pit Caused by Open-stope Mining#br#

LU Zhiwen, LIU Yunqiu, JIANG Peigen

2020, 36(10): 66.

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Application of New Technique of Safe,Accurate and Efficient Drilling and Blasting in Chambishi Copper Mine#br#

LI Hui, LI Zhanyan, YANG Qingping, LIANG Quanyu, ZHANG Zongyao

2020, 36(10): 68.

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Tunneling and Supporting Technology of Wellbore Maitou Door under Unusually Complex Geological Conditions#br#

CHEN Ke, MIAO Tao, HAO Hongsheng

2020, 36(10): 72.

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Study on the Technical Measures for Fire Prevention of 3204 Working Face of a Mine#br#

CHEN Yanming

2020, 36(10): 74.

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Practice of Medium Deep Hole Bottom Pulling and Deep Hole Side Caving Blasting Technology in Tieshan Mining Area#br#

MA Yanjun

2020, 36(10): 76.

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Stability Analysis of Goaf and Optimization of Stope Parameters in a Calcite Mine #br#

ZHANG Wende

2020, 36(10): 80.

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Application of Pregrouting Mining Method in Zhangzhuang Mine#br#

LI Wangbing et al

2020, 36(10): 84.

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Analysis of Blasting Influence Factors and Improvement Measures in Yanshan Open-pit Mine#br#

YU Shijie et al

2020, 36(10): 86.

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Research on Magnetic Separation of Lean Iron Ore in Xinjiang Province

WAN Yanxin, MA Yue, HU Haikuan, WANG Jue

2020, 36(10): 89.

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In order to determine the high efficient development and utilization technology of an ultralean iron ore (TFe grade 14.87%) in Xinjiang,the mineral processing experiment was carried out on the basis of process mineralogy.The results show that the main ironbearing minerals are magnetite,the main gangue minerals are chlorite,quartz,diopside and so on.Iron ore is closely associated with gangue minerals.The concentrate with a yield rate of 15.21%,TFe grade of 66.56% and recovery of 68.11% was obtained by crushing the samples to 5～0 mm by high pressure roller mill after dry magnetic separation,2stage grinding,low intensity magnetic separation and magnetic suspension cleaning,the characteristics of high mineral processing efficiency and low production cost have certain reference significance for the development and utilization of similar ore.

Iron Ore Dressing Test Research of Bingxin Mining

HU Guoguang, YAN Shen

2020, 36(10): 93.

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The iron ore grade of Bingxin mining industry is 18.50%,and the magnetic iron grade is 15.69%.The iron mineral in the ore is mainly magnetite,which is distributed in different sizes.The magnetite aggregate often contains finegrained gangue minerals.In order to determine the highefficiency development and utilization process of the ore,the beneficiation experiment was carried out.The results show that the ore via closedcircuit broken process to -3 mm by high pressure roller mill and then dumped by powder dry concentrator (magnetic field strength 318.47 kA/m,rotational speed 80 r/min).The concentrate obtained is 66.62% TFe grade and 80.98% recovery when the grinding fineness is -0.074 mm accounted for 85%,via one roughing one cleaning low intensity magnetic separation (magnetic field strength 191.08 kA/m and 143.31 kA/m respectively).The process is simple and efficient,which is suitable for the development and utilization of the ore.

Study on the Advantages of High Pressure Roller Mill and Stirring Mill in the Separation #br# Process of a Complex Refractory Iron Ore

DONG ZhenhaiYANG XiaofengLIU Shuang′an,

2020, 36(10): 95.

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In order to verify the advantages of high pressure roller mill and vertical stirring mill in the separation process of a complex refractory iron ore,a series of comparative tests were carried out.The results show that,compared with jaw crusher,highpressure roller mill product has higher powder rate and better grindability;compared with ball mill,vertical stirring mill has higher grinding efficiency and better effect;under the same grinding fineness,vertical stirring mill grinding product has higher dissociation degree and higher grade of magnetic separation iron concentrate;high pressure roller mill and vertical stirring mill is used to treat complex refractory iron ore has a significant advantage.

Experimental Study on Flotation of a Gold Ore#br#

HUI Yanhua

2020, 36(10): 98.

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Experimental Study on Beneficiation of Superpure Iron Concentrate Produced by a Magnetite in Hubei Province#br#

WANG Zhaolianet al

2020, 36(10): 101.

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Investigation and Comprehensive Utilization of Mine Tailings in Fujian Province#br#

WANG Xiaolei

2020, 36(10): 105.

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Practice on the Progress of Micro Fine Refractory Magnetite Beneficiation Technology in Tianye Iron Mine, Lan County

SONG Xinzhiet al

2020, 36(10): 108.

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Process Study on the Reclamation of a Copper and Cobalt Tailings Ore in DRC#br#

HU Shenchenet al

2020, 36(10): 111.

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Beneficiation Test of a High Sulfur Carbon-bearing Lead-zinc Ore Abroad#br#

XIONG Feng

2020, 36(10): 113.

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Optimization of Coal Preparation Technology for Difficult Slime Separation#br#

WANG Chunhua

2020, 36(10): 118.

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Application of 3DMine Software in the Design of Underground Mining Hole Blasting in Jianshan Iron Mine#br#

PENG Shouxing

2020, 36(10): 121.

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Application Practice on the Intelligent Control of Fully Mechanized Caving Working Face of Wenjiapo Mine#br#

JIA Shaohua, WANG Wancang, GAO Zhiyong

2020, 36(10): 127.

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Construction of Intelligent Dispatching System for Locomotive Transportation in Underground Mine of Dahongshan Copper Mine#br#

CHEN Xiuli et al

2020, 36(10): 129.

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Design of Flotation Foam State Classifier Based on Neural Network#br#

Yang Chi et al

2020, 36(10): 132.

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Application of Intelligent Remote Control Technology for Loaders in Underground Mines#br#

WANG Bangce et al

2020, 36(10): 134.

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Protection System of Cone Crusher Based on S7200 PLC#br#

WANG Benzhiet al

2020, 36(10): 137.

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Study on Rheological Properties of Water Sand Paste Filling Material in Coal Mine#br#

LI Ning et al

2020, 36(10): 139.

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Failure Analysis and Improvement Scheme of Rotary Mechanism of KY-310A Rotary Drill#br#

WU Chen et al

2020, 36(10): 142.

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Fault Characteristics of Mine Machinery and Equipment and Maintenance Strategy#br#

DU Jingyang

2020, 36(10): 144.

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Analysis on the Structure of Sanding Rod Mill MBG2745#br#

SUN Jianet al

2020, 36(10): 146.

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BOXAIII Currentcarrying X-ray Fluorescence Grade Analyzer Application in Yinmao Leadzinc Mine#br#

YIN Junet al

2020, 36(10): 149.

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Application of New Leakage Protector in Underground Mine Power Supply System#br#

WANG Xingxinget al

2020, 36(10): 152.

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Optimization of Lubrication Control System for Synchronous Motor#br#

Chen Yuchan et al

2020, 36(10): 155.

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Application and Optimization of Derrick High Frequency Fine Screen at Bayan Obo Baosteel Concentrator#br#

Ding Jiaocheng et al

2020, 36(10): 157.

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Application of SLon-2400 Centrifuge and Wear Treatment of Hub Outer Circle#br#

ZHAO Qianget al

2020, 36(10): 160.

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Operation Analysis and Transformation Strategy of Main Transformer in 110 kV Substation of Underground Mine#br#

WANG Zhikai

2020, 36(10): 162.

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Study on Stability of Openpit Slope of Jiajika Spodumene Mine#br#

DUAN JunfengLIU Na

2020, 36(10): 164.

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The stability of four openpit slopes with different heights in Kangding Jiajika Spodumene Mine was studied.On the basis of conducting onsite geological surveys,dividing the slope geology into rock groups and summarizing the failure modes of each zone,limit equilibrium method,twodimensional finite element numerical simulation analysis and strength reduction method are used to analyze the stability of the design slope of the openpit mine.Under three working conditions,the limit equilibrium analysis method is used to analyze the stability of two sections and three slope stability zones,and it is found that the stability meets the allowable safety factor.Using the twodimensional finite element numerical simulation method,it is found that the safety factor calculated by the strength reduction method is similar to the result of the limit equilibrium analysis method,and the obtained slope slip mode is also consistent,which proves that the result of the limit equilibrium analysis is reliable.The final boundary slope of the open pit of Jiajika Spodumene Mine under design is overall stable,and the step slope angle is reasonable.

Optimal Selection of Reformation Schemes of Ventilation System in High Mountain Environment Mine#br#

LI YajunPAN WenxinLI YinhongZHONG Shengyuan

2020, 36(10): 170.

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The elevations of the flat tunnel openings of the mines developed by the flat tunnels are different,resulting in different temperatures and pressures at each tunnel opening.And the alpine weather conditions make the impact more obvious.The changing natural wind pressure is very easy to cause the instability of the wind direction and air volume in the underground mine,which makes it difficult to ventilate the mine.A mine developed by a flat tunnel in an alpine environment in Sichuan Province is greatly affected by natural wind pressure,and there are still problems such as poor return air lines.For this reason,two ventilation technical solutions have been formulated.The first option is a ventilation method based on the diagonal extraction of the air shafts on the east and west wings,and the second option is the ventilation method of air intake from the east and west wings and the central return air.The technical and economic indicators of the two schemes are compared,including ventilation resistance,engineering quantity,equipment and operating costs.It turns out that considering the ventilation effect,investment cost and energy saving,the first one is the best ventilation solution.

Thickness Calculation and Safety Impact Prediction of an Iron Mine′s Waterproof Pillar#br#

ZHANG Qiao

2020, 36(10): 173.

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Scientifically and reasonably determining the thickness of the mine′s waterproof pillar is a prerequisite for safe production in the mine,which can protect the safety of houses and roads on the surface and prevent the generation of waterconducting fissures that can penetrate the Quaternary aquifer during mining.The load transfer intersection line method,K.B.Lubeneyita estimation method,and fracture zone height estimation method are used to calculate the thickness of the waterproof pillar.The thicknesses obtained by the three theoretical calculation methods are 14.3～17.3 m,17.5～31.4 m and 41.8～57.4 m respectively,so the thickness of the Waterproof pillar is 60 m.Numerical simulation shows that under the premise of a 60 m thick waterproof pillar,the maximum tensile stress generated in the mining area and pillar is about 0.47 MPa,and mining will not cause damage to the waterproof pillar.In the simulation results,the maximum horizontal displacement of the ground surface is about 5.8 cm,the maximum vertical displacement is about 26.5 cm,the maximum tilt is 1.70 mm/m,the maximum curvature is 0.20 mm/m2,and the maximum horizontal deformation value is 0.70 mm/m,which meets the relevant specifications Requirements to ensure surface safety.

Static Stability Analysis of Certain Tailings Dam by the Action of Capillary Water Based on FLAC2D#br#

TIAN Yakun, GUO Yaohui, WANG Zhonghui, ZHANG Zhijun,

2020, 36(10): 176.

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The static stability of the tailing dam by the influence of environmental factors in various aspects,Capillary water is also one of the important factor,So For the tailings dam Using FLAC2D numerical simulation by the action of capillary water and Regardless of the capillary water.To draw out the two cases of X and Y direction displacement contours,Cloud principal stress changes,Shear stress cloud image edge incremental change.And to calculate the safety factor of the two conditions,Found in considering capillary effect of the static stability of the tailings dam when the water will be reduced,Safety factor is reduced by 35%.The analysis results Provides a scientific basis for The safe operation of the tailings dam.

Optimization and Reformation of Ventilation System in Tonglushan CopperIron Mine#br#

GUO QingguangLU ZhiyongYANG Changbin

2020, 36(10): 179.

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The ventilation system of Tonglushan Copper and Iron Mine has problems such as unreasonable air volume distribution,underground sewage air circulation,poor local ventilation and difficult management of underground ventilation structures.In order to solve these problems,combined with the actual production situation to recalculate the total air volume of the mine,three optimization schemes are proposed.After technical and economic comparison and analysis,the multilevel station ventilation system is determined to be the optimal solution.Through the simulation and calculation of the threedimensional ventilation software,the total air volume of the mine reaches 428.03 m3/s,which meets the calculated total air volume of the mine.The ventilation mode of the multilevel machine station realizes the regional ventilation of each area,and the air volume distribution is more reasonable,avoiding the interference between the ventilation areas,improving the stability of the ventilation system,and effectively increasing the deep air intake of the ventilation system.

Stability Analysis of the Seepage Slope of the Northwest Side of Washan Tailings Pit#br#

WANG Shaoping, LIU Bing, XU Jinjun, LUO Changhai, GUAN Lin, DENG Guoping

2020, 36(10): 184.

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The node virtual flow method is used to calculate the groundwater seepage on the northwest side slope of the tailing pit reconstructed from the Aoshan pit;According to the limit equilibrium method,considering the change of water level in the pit and the softening phenomenon of longterm submerged rock mass,the stability of the slope on the northwest side of the pit is discussed.The results show that when the water level rises no more than 1.7 m and the water level falls no more than 0.5 m,the slope stability of the longterm submerged rock mass does not change much;However,the softening of the rock mass will reduce the longterm stability of the slope.The research results have certain reference value for similar slopes.

Optimization of Supporting Scheme for Goaf Roadway in Fully Mechanized Caving of Thick Coal Seam#br#

WANG Wencai et al

2020, 36(10): 187.

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Water Pressure Test of Shaft Grouting Project in Extremely Thick Aquifer of Dengying Formation#br#

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