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Table of Content

    25 May 2025, Volume 41 Issue 05
    Previous Issue   
    Research Status and Prospect of Spray Dust Removal Technology in Mines
    2025, 41(05):  1-5，11. 
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    In order to further improve the application efficiency of spray dust removal technology in mine dust control，aiming at the problems existing in the traditional single spray dust removal technology in the current mine operating environment，the atomization and dust capture mechanism analysis and applica⁃ tion evaluation of spray dust removal technology were systematically carried out. The atomization mechanism and dust removal characteristics of different spray dust removal technologies were discussed. The applicable conditions of pressure atomization，pneumatic atomization and ultrasonic atomization and the mechanism of their interaction with dust particles were systematically analyzed. The synergistic mechanism of synergistic spray dust removal technology is analyzed in depth，and the technical challenges that synergistic spray dust removal technology will face in practical application are proposed. The future development trend of mine spray dust removal technology is to move towards a more efficient，environmentally friendly and economical direction. The in-depth research and application of multi-technology synergy systems will become an impor⁃ tant development direction. At the same time，focusing on breaking through the core technology of atomiza⁃ tion and optimizing the energy saving and environmental protection performance of the system，the simulta⁃ neous improvement of dust removal efficiency and sustainability is realized，which will provide an important
    Research Progress on Pretreatment Technology and Flotation Technology of Refractory Gold Ore in China
    LIU Haoran MA Fangyuan XIE Siying DENG Lijia
    2025, 41(05):  6-11. 
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    Abstract In order to solve the problem of efficient recovery of complex refractory gold ore in China， in view of the current situation that the existing separation technology is difficult to meet the current demand for efficient flotation of refractory gold ore，the research progress of pretreatment technology and new en⁃ hanced flotation technology of refractory gold ore is systematically sorted out by analyzing and studying the new high-efficiency and environmentally friendly separation technology and mechanism. The characteristics of the new technology are compared，the advantages and existing problems of each technology are expound⁃ ed. At the same time，it is pointed out that the research and development of efficient recovery technology for refractory gold mines in the future still needs to be strengthened，and the direction of technology research and development in the field of gold ore separation is prospected.
    Research Progress on Explosive Wastewater Treatment Technology
    WANG Yujie
    2025, 41(05):  12-18. 
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    In order to reduce the environmental hazards caused by the discharge of explosive wastewa⁃ ter，aiming at the removal of total nitrogen in explosive wastewater，the explosive wastewater treatment tech⁃ nology is divided into three categories: physical technology，chemical technology and biotechnology. The characteristics，removal effect and application status of these three technologies are summarized. The analy⁃ sis results show that the physical technology is simple，but it is difficult to effectively and quickly remove ni⁃ trogen from wastewater. Chemical technology has high degradation efficiency，but it is easy to cause second⁃ ary pollution. Biotechnology has strict environmental requirements and is not easy to be used on a large scale. At present，these technologies cannot ensure the complete elimination of total nitrogen pollutants，but only transfer it from one stage to another，which still needs further treatment. The combination of physical technology，chemical technology and biotechnology as a combined process to remove total nitrogen pollut⁃ ants is the future research trend，which can provide reference for the removal of explosive wastewater.
    Study on the Influence of Underground Mining on the Surface of Xingshan Iron Mine
    2025, 41(05):  19-23，29. 
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    Underground mining of metal mines will cause surface subsidence，may produce cracks， collapse pits，etc.，causes damage to surface facilities such as houses，roads，optical cables，etc.，affects land use and vegetation growth，and then destroys the ecological balance. In order to study the influence of underground mining on the surface，based on the actual mining process of Xingshan Iron Mine，FLAC3D soft⁃ ware is used to simulate the filling process of ore body mining，a reasonable simulation scheme is estab⁃ lished and the mining simulation was carried out. The surface subsidence，horizontal deformation，inclina⁃ tion and curvature caused by mining are analyzed，and the influence of underground mining on the surface is comprehensively evaluated. The results show that the deep mining process of Xingshan Iron Mine can en⁃ sure that the surface deformation is within the controllable range，and has no obvious impact on the key proj⁃ ects. In the mining operation of ore bodies above -330 m，there is a certain degree of vertical displacement change in the open-pit slope. At the end of the mining operation of the -330~-480 m orebody，the vertical displacement of the open-pit slope perpendicular to the strike of the orebody did not change significantly compared with the completion of the mining of the orebody above -330 m. The research results provide a the⁃ oretical basis for the subsequent safe mining of the mine.
    Optimization and Application of Shaft Safety Pillar Based on Rock Properties
    2025, 41(05):  24-29. 
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    In view of the problem that a large number of safety pillars in the wellbore of metal mines are pressed，resulting in a serious waste of resources，a method for optimizing the safety pillars based on the mechanical properties of rock strata is proposed by taking the overlying ore body of a mine air shaft in Anhui as an example. The numerical simulation method is used to analyze the safety impact of the mining of the overlying ore body on the wellbore. The results show that based on the rock properties revealed by the bore⁃ holes near the south air shaft，the traditional method of safety pillar delineation is used to delineate the bro⁃ ken and fractured parts of the shallow surrounding rock，which is a truncated cone type. The better part of the deep surrounding rock is optimized to be cylindrical. After optimization，the diameter of the southern air shaft security pillar is 148 m，and it is expected to recover nearly 99.8 % of the ore volume of the original overburden ore body. The mining disturbance of the overlying ore body has little influence on the safety of the air shaft. Within the allowable range of the relevant specifications，it can ensure the needs of mine safety production.
    Stability Analysis and Treatment Scheme Study of Goaf in a Lead-zinc Mine
    2025, 41(05):  30-35，39. 
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    Taking the goaf of a lead-zinc mine in Fujian as the research background，a three-dimen⁃ sional mechanical analysis model is established through a detailed investigation of the natural geographical conditions of the mining area，and the stability of the goaf is quantitatively evaluated. Using numerical simu⁃ lation technology and finite difference method，the stability of single goaf and goaf group is simulated. It is found that it is affected by many factors such as original rock stress，structural plane，lithology and ground⁃ water conditions. Based on the comprehensive evaluation index system of stability，the stability of surround⁃ ing rock in goaf is divided into four grades : stable state，basic stable state，unstable state and unstable state. Among them，three unstable goafs are located in the middle section of 160 ~ 170 m，and there is a high risk of instability. In view of the different goafs，a treatment scheme based on closed isolation is pro⁃ posed，supplemented by waste rock filling and roadway reinforcement measures. At the same time，the feasi⁃ bility of pillar recovery is evaluated，and the recovery principles and conditions are determined. The re⁃ search shows that reasonable goaf treatment and pillar recovery scheme are very important to ensure the safe production and efficient utilization of resources. It is suggested to take effective ground pressure control mea⁃ sures and adjust the mining scheme in time to ensure the long-term stable operation of the mine.
    Application of Control Technology for Fractured Surrounding Rock in High Stress Zones of Full Coal Roadways
    CAI Jizhou
    2025, 41(05):  36-39. 
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    During the excavation of 3203 transport channel of Yangcheng Sihou Coal Industry Co.， Ltd.，due to the influence of nearby goaf，small kiln failure area and geological structure，the roadway is driven to the high stress area in the section 410~490 m，and the stress phenomena such as two-side cav⁃ ing and roof subsidence and caving appear. From the coal seam occurrence，concentrated stress and sup⁃ porting structure，the crushing mechanism of surrounding rock in high stress area is analyzed，and the sur⁃ rounding rock support is optimized，and the combined support technology of "flexible grouting + truss an⁃ chor cable + trapezoidal steel shed + shotcrete" is proposed. The practical application results show that af⁃ ter adopting the combined support technology，the maximum roof subsidence is 0.14 m，the caving depth of the two walls is reduced to 0.6 m，the length of the slab is reduced to 1.7 m，the convergence of the two walls is reduced to 0.37 m，and the tunneling speed is increased to 5.4 m/d，which has achieved remark⁃ able application results.
    Design of Development and Transportation System Scheme of a Mine
    JIN Sheng, LI Zhen, HAO Xueran,
    2025, 41(05):  40-43，48. 
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    Taking a large-scale granite open-pit mine for construction as the research object，two de⁃ velopment and transportation schemes of highway + adit chute（scheme I）and highway + fixed crushing sta⁃ tion（scheme II）are proposed，and the cost comparison analysis is carried out. The results show that the av⁃ erage annual operating cost of scheme I is 8 million yuan lower than that of scheme II，but because of its long construction period（3.5 a）and high investment（90 million yuan higher than that of scheme II ），the payback period of the difference investment is 11 a，and the comprehensive economic benefit is insufficient. The investment of scheme II is low，and the capital construction period is only 1.5 a. It can be put into pro⁃ duction quickly and is recommended for comprehensive application. In terms of transportation equipment se⁃ lection，it is found that the initial investment of new energy wide-body vehicles is 3.86 times that of fuel ve⁃ hicles by using the present value-cost method，but the average annual operating cost is reduced by 50%， and the present value of the whole cycle cost is reduced by 20.5%，which is more economical. The conclu⁃ sion shows that the scheme of highway + fixed crushing station combined with new energy equipment meets the needs of green transformation while ensuring economic benefits，and provides a practical example for the optimization of open-pit mine transportation system.
    Impact Risk Analysis of Overlying Coal Pillar Affected Zone in Protective Layer Mining
    LIU Faqi
    2025, 41(05):  44-48. 
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    Aiming at the analysis of the influence of residual coal pillars on the dynamic disasters in the protective layer mining area，taking Jinsheng Yong 'an Hongtai Coal Mine as the research object，the oc⁃ currence mechanism and microseismic distribution characteristics of rock burst in 40201 working face are analyzed，and the dangerous area of rock burst is divided according to the distribution of stress field. The re⁃ sults show that after the protective layer mining technology is adopted，the cumulative vibration events dur⁃ ing the monitoring period are 78 cases，and the total released energy is 9.3×104 J，showing the characteris⁃ tics of low energy and low frequency as a whole. The stress concentration area formed by the remaining coal pillars and the fault distribution of the working face significantly increase the probability of dynamic instabil⁃ ity of the surrounding rock. The overall rock burst risk on the side of the return air roadway is higher，which is characterized by wider distribution and stronger spatial continuity. The research results provide a theoreti⁃ cal basis for the subsequent production of the mine.
    Research and Application of Fine-grained Tailings Filling Technology in an Iron Mine in Hebei Province
    LIU Yunlong, LIU Yabin, LI Lin, YANG Jinguang, ZHANG Yikun, LI Yanke,
    2025, 41(05):  49-52，58. 
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    In order to solve the related technical problems of low filling concentration and low filling strength of fine-grained tailings in the filling process of Zhongguan Iron Mine，the physical and chemical properties of filling aggregate，the flocculation sedimentation test of fine-grained tailings，the strength test of different cementitious materials of fine-grained tailings and the strength test of different cement-sand ra⁃ tio of fine-grained tailings are studied，and the technical transformation scheme of filling system is put for⁃ ward. The final field results show that when the fine-grained tailings cement-sand ratio is 1∶5，the 3 d uni⁃ axial compressive strength of the filling body is ≥ 1.0 MPa，the 7 d compressive strength is ≥ 1.5 MPa，and the 28 d compressive strength is ≥ 2.5 MPa，which fully meets the two-step mining demand of Zhongguan Iron Mine. It not only solves the problem of fine-grained tailings discharge，reduces the pressure of the filter press workshop，but also improves the utilization rate of tailings.
    Research on Energy Dissipation and Burst Prevention of Large Diameter Drilling in Soft Coal
    SUN Zhenping,
    2025, 41(05):  53-58. 
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    Pressure relief technology of large diameter borehole is one of the effective measures to prevent rock burst.Using the method of roadway stress research，the paper analyzes the stress distribution of surrounding rock of large diameter borehole，the mechanism of surrounding rock deformation and fail⁃ ure，and the mechanism of pressure relief and anti-impact. By using numerical analysis method，the effect of pressure relief and anti-scour in soft coal is studied when the parameters of large diameter drilling （drilling distance，drilling length，etc.）are changed. The results show that for soft coal with elastic modu⁃ lus of 0.4 GPa and Poisson's ratio of 0.43，the cracks near the borehole develop quickly，the borehole is easy to collapse，and a large range of fracture zones will be generated during the process of pressure relief. When the variation interval of hole distance is 0.6~2.4 m，better pressure relief effect can be obtained. The peak stress of the surrounding rock is about 9.6 m away from the roadway. When the hole depth is more than 10 m，the pressure relief effect is more obvious. Through the field test，the pressure relief effect of large diameter drilling before and after optimization is compared and analyzed，and it is verified that the pressure relief effect of large diameter drilling after optimization is more significant.
    Research on Ventilation Technology of Long-distance Single-head Roadway Based on Ventsim
    HE Zhi HU Kaiguang
    2025, 41(05):  59-62，66. 
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    In the construction process of long-distance single-head roadway，due to the conduct of various operations，it is easy to cause the air index in the roadway to exceed the standard. When the length of the single-head roadway continues to extend，the original pressure ventilation method has been unable to meet the requirements of underground ventilation. In order to solve the ventilation problem of long-distance single-head roadway，on the basis of theoretical calculation，Ventsim software is used to simulate the venti⁃ lation of long-distance single-head roadway. The forced ventilation，extraction ventilation，mixed ventila⁃ tion and mixed + air curtain machine ventilation simulations are carried out under the conditions of 1 500 m， 2 200 m and 3 554 m，respectively. The air volume，total air resistance and air network efficiency are ana⁃ lyzed. The results show that the mileage of the single-head roadway is less than 1 500 m，and a single 22 kW fan is used for forced ventilation. The air volume is 9.4 m3 /s，the total air resistance is 20.917 N·s 2 /m8 ，and the air network efficiency is 55.8%. After the roadway mileage reached 2 200 m，three 22 kW fans were used for hybrid ventilation. The air volume was 13.2 m3 /s，the total air resistance was 41.647 N·s 2 /m8 ，and the air network efficiency was 80.4%. The roadway mileage reaches 3 554 m，and the mixed + air curtain machine is used for ventilation. The air volume is 15.2 m3 /s，the total air resistance is 81.186 N·s 2 /m8 ，and the ventilation efficiency is 71.3%.The simulation results are used in engineering practice, and the ventila⁃ tion mode of hybrid + air curtain machine is adopted, which effectively solves the ventilation problem of long-distance single-head roadway.
    Research and Application of Comprehensive Cooling System for Long Distance Roadway in Tianmashan Mine
    JU Weiwei DONG Zhen
    2025, 41(05):  63-66. 
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    With the gradual increase of mining depth in Tianmashan Mine，on the basis of the same to⁃ tal air volume，the ventilation system is difficult to play a major role in ventilation and cooling，and the high-temperature air flow cannot meet the requirements of the on-site construction environment. In order to effectively solve the problem of high temperature heat damage in Tianmashan Mine in summer，through the measurement and analysis of the rock temperature，air temperature and water temperature of each middle section air inlet roadway，a set of long-distance roadway comprehensive cooling system is proposed based on the rock temperature and water temperature conditions of the upper roadway. The low-temperature water and rock temperature of the shallow long-distance roadway are fully contacted with the high-temperature air⁃ flow to achieve the effect of reducing the air temperature. The practice shows that the air temperature in the shallow long distance roadway and the deep main production middle section of Tianmashan Mine has been effectively reduced，which solves the high temperature problem of the summer inlet air flow in the mine and improves the environment of the deep workplace.
    Application of Floor Directional Interception Drilling Gas Control Technology in Qidong Coal Mine
    CAO Ming SUN Zhenping,
    2025, 41(05):  67-70，75. 
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    Aiming at the problem of gas exceeding the limit caused by the gas emission from the 9 coal seam of the lower adjacent layer of Qidong Coal Mine to the 82 coal working face，the 8235 working face is taken as the research object，and the gas control technology of the directional interception borehole in the floor is proposed and implemented. By accurately intercepting the gas emission channel of the lower adjacent layer through directional drilling，the gas content of the adjacent layer is fundamentally reduced， and the problems of traditional treatment methods ( such as high-level drilling，replacing roadways with holes，etc. ) that only alleviate gas emission and fail to address both symptoms and root causes are solved. Based on the law of gas migration and geological conditions，the directional drilling trajectory of the bottom plate is designed to control the drilling spacing equal or lesser than 20 m，and the final hole is located to the fault tectonic zone. The stability of the extraction system is ensured by using two plugging and one grout⁃ ing bag grouting sealing technology and ϕ73 mm steel screen pipe hole protection technology. Through real�time trajectory measurement and dynamic adjustment of drilling parameters，the construction accuracy is guaranteed. The results show that under the standard condition，the pure amount of gas extraction is in⁃ creased from 25 m3 /min to 40 m3 /min，and the average is maintained at 10 m3 /min. The gas content of No.9coal in the extraction area decreased from 4.109 8 m3 /t to 2.661 1 m3 /t ( a decrease of 54% )，and the gas pressure decreased from 0.46 MPa to 0.202 5 MPa ( a decrease of 127% )，which significantly reduced the risk of gas emission from adjacent layers. At the same time，the gas concentration in the return air of the working face is stable below 0.25%，and the gas concentration in the upper corner is reduced from 0.54% to 0.35%，which effectively avoids the problem of exceeding the limit. This technology realizes the source pre⁃ vention and control of gas control in adjacent strata by accurately intercepting the gas migration path，and provides an innovative solution for gas control in adjacent strata under high outburst mines.
    Damage Causes Analysis and Repair Practice of Main Chute in Zhongguan Iron Mine
    XIE Anming, YU Xingshe, MA Ning, DU Wei,
    2025, 41(05):  71-75. 
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    In order to solve the problem of a large number of damage to the supporting structure in the production process，Zhongguan Iron Mine found that the main reason for the damage is unreasonable sup⁃ port form through the analysis of the whole process of supporting site selection and construction trial. Through the research on the characteristics of rigid support and flexible support，combined with the failure characteristics of each support section of the main chute，the support scheme is optimized and adjusted. The square steel is used instead of the rail，and the reinforced concrete and steel fiber concrete are combined with the manganese steel plate method of the anchor rod deep into the bedrock to increase the anti-crushing and wear-resisting characteristics of the rigid support. At the same time，the flexible support such as the buf⁃ fer platform and the buffer chamber is added at the bottom of the unloading pit and the strong impact point to solve the impact failure. The main chute has been in normal operation for 3 a，and the supporting structure has not been destroyed，which has achieved good practical results.
    Study of Tunnel Coupling Support in Areas with Frequent Rock Burst in Coal Mine
    XIONG Hanjun
    2025, 41(05):  76-79. 
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    The area with frequent rock burst has seriously affected the safety operation of coal mine en⁃ terprises. In order to reduce the threat of rock burst to the safety of coal mine workers，it is necessary to carry out different pressure relief and support measures of roadway. Taking 21170 face of Hongxing Coal Mine as the research area，this paper analyzes the geological characteristics and the existing problems of the original roadway support system，and puts forward a new coupling support system for mine roadway to prevent rock burst. Field measurement shows that the effect of coupling support is obviously improved compared with the original support condition of roadway after rock burst. The combined support of bolt and soft structure con⁃ trols the anchoring area of roof，prevents the displacement of roadway，strengthens the support of shallow surrounding rock and deep surrounding rock，and prevents the subsidence of roadway roof. The coupled sup⁃ port can significantly reduce the probability of rock burst.
    Research on Filling Material Strength for Deep Mining of a Certain Iron Mine
    XIONG Xianliang WANG Xiaoliang XU Yongbin
    2025, 41(05):  80-83. 
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    The stage empty field subsequent filling mining method was adopted for mining，the ore body below -530 m of a certain iron mine.Through the methods of indoor tests，engineering analogy and theo⁃ retical calculation，the strength of the required filling body in the deep part was analyzed to provide a reason⁃ able filling slurry ratio for the mine. The results show that when graded tailings are used as the filling aggre⁃ gate，the slurries with mass concentrations of 64%，67%，and 70% have good fluidity，and the slump of the slurries is all greater than 210 mm，which meets the transportation conditions in the pipeline.The uniaxial compressive strength of the filling body maintained for 28 d under the conditions of ash-sand ratios of 1∶6，1 ∶8，1∶10，and 1∶12 respectively is relatively high.Moreover，with the increase of mass concentration and ash�sand ratio，the strength of the filling body increases accordingly，with the lowest being 1.596 MPa and the highest reaching 8.039 MPa，which can provide a good filling effect for the filling of deep empty areas. Combined with the deep mining conditions and filling techniques，the strength of the deep filling body in the mine needs to meet the requirements of R28≥3.0 MPa in the first step and R28≥1.5 MPa in the sec⁃ ond step. Filling slurry with a mass concentration of 67% can be adopted，among which the ratio of ash to sand in the first step filling is 1∶10 and that in the second step filling is 1∶12.
    Study on Optimization of Partition Ventilation System in Wangershan Mine
    SANG Junsheng ZHAO Zhenpeng ZHANG Hao
    2025, 41(05):  84-87. 
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    With the downward movement of the production center of Wangershan Gold Mine，there are some problems in the deep mine，such as long ventilation route，large resistance，lagging ventilation engineering，insufficient ventilation and bad environment. It is necessary to optimize the mine ventilation system to create a good working environment for underground workers.By adopting the partition ventilation mode，a relatively independent ventilation system is formed above the level of -550 m and below the level of -550 m. The deep ventilation project is reformed，and the return air shaft is newly excavated. An axial flow fan is added to the return air side at the level of -550 m as a return air auxiliary fan to adjust and con⁃ trol the air volume in the deep middle section. The Ventsim software is used to solve the network of the opti⁃ mized ventilation system. According to the calculation results，the total air volume of the optimized Wang⁃ ershan Gold Mine can reach 170.4 m3 /s，of which the return air volume of the mining area below -550 m is 111.6 m3 /s，which can meet the air volume required for deep mining and improve the underground working environment.
    Research on Optimization of Ventilation System in Tongshan Copper Mine Based on Ventsim
    LIU Shouan
    2025, 41(05):  88-92. 
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    With the main production area of Tongshan Copper Mine turning to the middle section of -613 m and below，the mine ventilation network structure has changed，the air volume distribution of the ventilation system is uneven，the short circuit problem of the air flow is prominent，the ventilation of the deep local operation site is not smooth，and the phenomenon of high temperature and high humidity in the working face is prominent. Therefore，on the basis of completing the detection of ventilation system and the analysis of on-site problems，the optimization and transformation scheme of ventilation system is proposed， and the partition ventilation mode is adopted. The ventilation system is divided into three relatively inde⁃ pendent ventilation areas : the old area above -345 m，the middle area between -388 m and -523 m，and the deep second-stage area below -613 m，and the ventilation structures are set reasonably. A new deep return air project below -568 m is excavated，and a return air auxiliary fan is added on the return air side at -613 m，-658 m and-703 m levels. Using Ventsim three-dimensional simulation software，a three-di⁃ mensional mine ventilation system simulation model is established to simulate and verify the effect of the ventilation system optimization scheme，which provides a basis for the optimization and transformation of the ventilation system. After the optimization，the ventilation system is tested and analyzed. The results show that the stability of the ventilation system is enhanced，and the problem of air flow short circuit is solved. The air volume in the middle section of -613 m and below is increased to 80.33 m3 /s，which meets the air volume required for deep mining，effectively solves the problem of high temperature and high humidity in deep working sites，and ensures the smooth progress of mine safety production.
    Study on the Behavior characteristics and Kinetic Mechanism of Copper Laching by Glycine
    SHAN Haoxuan, ZHAO Liucheng, LI Shaoying, YIN Jiaxin, LI Dingding, ZHANG Yaning QIN Jianqiu ZHAO Libing
    2025, 41(05):  93-97. 
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    In order to explore the behavior characteristics and kinetic mechanism of copper leaching by glycine，the effects of leaching temperature，glycine concentration and stirring speed on copper leaching behavior were systematically investigated，and the kinetic model of copper leaching by glycine was con⁃ structed. The results show that the leaching temperature and glycine concentration have a significant effect on the copper leaching rate and leaching frequency. Under the conditions of leaching temperature of 60 ℃， glycine concentration of 0.5 mol/L，stirring speed of 400 r/min and leaching time of 48 h，the leaching rate of copper is more than 99%. The leaching process conforms to the shrinking core model. The copper parti⁃ cles gradually dissolve from the outside to the inside，and the surface gradually becomes concave and rough from smooth and round，but still maintains a spherical profile. The kinetic analysis showed that the apparent activation energy of the reaction was 51.5 kJ/mol，which belonged to the chemical control process. The reac⁃ tion orders of glycine and stirring speed are 2.0 and 0.8，respectively. This study provides a theoretical basis for the clean and efficient recovery of copper resources in e-waste.
    Parameterized Drawing Study of Typical Flotation Flow Chart Based on DXF
    ZHANG Shuai TIAN Fuquan WANG Dawei WANG Xingyuan ZHAO Zhenpeng ZHANG Tianbin QIU Dunfang GAO Mingjie SONG Zichong WANG Maomao
    2025, 41(05):  98-102，107. 
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    The traditional manual drawing of flotation process flow chart has a large amount of repeti⁃ tive work，poor standardization and insufficient versatility. In order to efficiently draw the line flow chart of flotation，through the research and analysis of the operation rules of DXF file entity，the C++ language is used to write the program in the Visual Studio 2022 development environment. The program describes the flow chart structure，reads and directly creates the DXF file，and carries out the secondary development of Auto⁃ CAD，which realizes the parametric drawing of the flotation process flow chart of the single-cycle ore return sequence，and provides examples and associated codes to show the specific operation process.The research results show that the method shows effectiveness，accuracy and applicability for the drawing of flotation pro⁃ cess flow chart，and effectively improves the drawing accuracy and efficiency of flotation process flow chart.
    Study on Process Mineralogy of a Certain Iron Ore in Eastern Hubei
    HUANG Wen ZHAO Jialong, LI Pengfei LI Yubiao, LIU Shu WANG Zhonghong, LI Wanqing,
    2025, 41(05):  103-107. 
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    In order to clarify the comprehensive utilization direction of an iron ore resource in eastern Hubei and optimize the beneficiation process，the process mineralogy of the iron ores was systematically studied by means of chemical analysis，scanning electron microscopy and automatic quantitative analysis of minerals. The results show that the main components of the iron ore are metallic minerals such as magnetite， pyrite and chalcopyrite，as well as gangue minerals such as garnet，potassium feldspar and quartz. The con⁃ tents of iron，copper and sulfur are 32.06%，0.02% and 1.20%，respectively. Magnetite mainly exists in the form of semi-automorphic or anhedral granular，mostly in the form of disseminated or agglomerated distribu⁃ tion，and locally in the form of dense disseminated. The degree of monomer dissociation is low，and the rela⁃ tionship between magnetite and gangue minerals is complex. Fine grinding is needed to improve the degree of monomer dissociation. In addition，sulfur mainly exists in the form of pyrite，and copper exists in the sin⁃ gle form of chalcopyrite. The relationship between the two is simple and can be recovered by flotation. Based on the results of process mineralogy research，it is recommended to use dry magnetic separation-rough grinding-one stage magnetic separation-fine grinding-two stage magnetic separation-magnetic separation tailings copper-sulfur flotation process.
    Wet High Intensity Magnetic Preconcentration Test of High Pressure Roller Mill Product of Low Grade Siderite in Daxigou
    YUAN Qidong, CHEN Zhou, YANG Renxin, YU Xi, LIU Jun,
    2025, 41(05):  108-110，116. 
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    In order to efficiently develop and utilize low-grade complex refractory iron ore，the wet high intensity magnetic pre-separation test was carried out on the high pressure roller mill product of low�grade siderite ore in Daxigou.The conditions of different magnetic field strength，flushing water volume，rotat⁃ ing ring speed and pulsating stroke were tested respectively. According to the results of the condition test， the best process parameters were selected.The test results show that under the condition of 25.54% iron grade of raw ore，the iron concentrate with yield of 83.65%，iron grade of 27.74% and iron recovery of 90.84% can be obtained by wet high intensity magnetic preconcentration of high pressure roller mill product. At the same time，the coarse tailings with yield of 16.35% and iron grade of 14.31% are thrown out. The effect of discard⁃ ing is better，the amount of ore dressing into grinding is greatly reduced，and the effect of energy saving and emission reduction is obvious. It has reference value for the efficient development of this kind of iron ore.
    Experiment on Flotation Recovery of Fluorite from Fine Grained Bayan Obo Tailings
    ZHANG Wendi, ZHAO Ruichao, JIA Yan, XIN Wenbin HE Yulong, WANG Wenqing,
    2025, 41(05):  111-116. 
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    In order to efficiently utilize the potential fluorite resources of Bayan Obo tailings，aiming at the problems of fine particle size of tailings，complex test process of comprehensive recovery of fluorite and low recovery efficiency of fluorite，the superconducting tailings treated by permanent magnet-electro⁃ magnetic-superconducting process of Bayan Obo main east mine tailings were used as raw materials to car⁃ ry out the beneficiation process test of comprehensive recovery of fluorite from tailings. The test results show that the two-stage combined flotation process is adopted with 2# as the regulator，acidified sodium silicate as the inhibitor and sodium oleate as the collector. The first stage flotation adopts one roughing and three cleaning flotation process，and the second stage flotation is the re-purification of the first stage flota⁃ tion concentrate by one roughing and one cleaning. Finally，high-grade fluorite concentrates with CaF2 grade of 90.82% and CaF2 recovery of 30.14% can be obtained，which provides theoretical guidance for the subsequent comprehensive recovery of fluorite from fine-grained Bayan Obo tailings.
    Process Mineralogy Study of a Gold Ore in Henan
    ZHANG Lin WU Wenbin
    2025, 41(05):  117-120，124. 
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    In order to develop and utilize ore resources more efficiently，the process mineralogy of a gold ore in Henan Province was studied by means of microscope and scanning electron microscope，supple⁃ mented by X-ray diffraction analysis technology and chemical analysis，and its structural，mineral composi⁃ tion，gold occurrence state and other process mineralogy characteristics were identified. The test results show that the useful minerals of the ore are mainly natural gold，and a small amount is silver-containing nat⁃ ural gold. The average content of natural gold is more than 98%，which is coarse-to-giant gold. The gold�bearing minerals are mainly quartz and limonite. In addition，a small amount of mica and other minerals are associated with natural gold. Further evaluation of gold ore can provide theoretical basis and practical refer⁃ ence for later beneficiation，smelting and comprehensive utilization.
    Tungsten Mineral Beneficiation Process Test of Ninghua Xingluokeng Tungsten Mine
    HU Jinping
    2025, 41(05):  121-124. 
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    The tungsten slime treatment system of Ninghua Xingluokeng tungsten plant has problems of high production cost，great difficulty in tungsten recovery and poor economic benefits. In order to solve the above problems，based on the study of ore properties，a new combined process of centrifuge gravity sepa⁃ ration (one roughing and one scavenging) -flotation (one roughing，two cleaning and one scavenging) was used to replace the original desulfurization-wolframite and scheelite mixed flotation-flotation，magnetic and gravity separation of wolframiteand scheelite separation process. The results show that the tungsten concen⁃ trate with WO3 grade of 55.23%，WO3 recovery rate of 89.71%，sulfur content of 0.69%，sulfur distribution rate of 3.46% and sulfur-containing minerals with sulfur grade of 45.22% and sulfur recovery rate of 85.37% were obtained by gravity separation and enrichment with centrifuge. The technical problem of efficient sepa⁃ ration of tungsten ore is solved，which not only improves the quality of tungsten concentrate，but also im⁃ proves the production environment of the concentrator，and the economic and environmental benefits are re⁃ markable.
    Research on Efficiency Enhancing of Magnetite Beneficiation through High Pressure Roller Mill
    CHEN Shuang LI Zhaopeng WANG Jue LI Rui YU Jianwen GAO Peng
    2025, 41(05):  125-129. 
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    In order to improve the efficient development of complex magnetite resources and the level of energy saving and consumption reduction in beneficiation，a low-phosphorus and low-sulfur magnetite in Cameroon was taken as the object，and the beneficiation effects of conventional jaw crushing process and high pressure roller mill process were compared according to the ore characteristics of uniform distribution and hard discarding tailings. Through particle size analysis，dry preconcentration and discarding tailings test，Bond ball mill work index determination and grinding-magnetic separation test，it is found that after the high pressure roller mill is crushed to -3 mm，the proportion of fine particles is significantly increased， the dry discarding tailings yield rate is 25.85%，and the concentrate TFe grade is increased to 44.31%. At the same time，the Bond ball mill work index is reduced to 8.80（kW·h）/t，and the grinding energy con⁃ sumption is reduced by 20%. Finally，the TFe grade of concentrate reached 65.32% and the iron recovery rate was 95.07% after one magnetic separation，which was significantly better than that of jaw crushing pro⁃ cess. The research shows that the high pressure roller mill technology can effectively improve the beneficia⁃ tion efficiency of magnetite and reduce energy consumption through the strategy of 'more crushing and less grinding，early separation and early throwing'，which can provide theoretical support and technical route for the efficient development of complex magnetite resources.
    Test and Production Practice of Front Return Water Utilization in a Sulfur-oxygen Mixed Copper Mine#br#
    LIU Guochen
    2025, 41(05):  130-132. 
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    Due to the large number of Chinese-funded mining enterprises in the vicinity of a large�scale sulfur-oxygen mixed copper mine abroad，the water resources are tight. In order to solve the dilemma of large water load in the dry season，a small-scale experimental study was carried out in the laboratory for front return water utilization（concentrate dense overflow water and pressing water）. Through the comparison of indicators and the dosage of reagents，a good field application effect was finally obtained. After nearly half a year of production data tracking，the use of front return water not only effectively solved the water demand of the whole flotation process，but also significantly reduced the unit consumption of key reagents on site un⁃ der the condition of beneficiation index stabilizing，and the corresponding power cost was controlled，with remarkable economic benefits.
    Experiment and Industrial Application of Alkaline Leaching Processof Antimony in a Antimony-bearing Gold Concentrate
    DU Anping YANG Peng
    2025, 41(05):  133-136. 
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    In order to improve the utilization rate of mineral resources，realize the efficient recovery of antimony，and reduce the adverse effect of antimony on the subsequent roasting cyanide gold extraction pro⁃ cess，a small-scale experimental study on the alkaline leaching antimony process was carried out for the an⁃ timony-bearing gold concentrate obtained by the flotation process of a gold concentrator. Based on the test results，the process parameters of the downstream smelting enterprises were optimized and adjusted. The production practice shows that using sodium sulfide and sodium hydroxide as leaching agents，under the conditions of slurry concentration 40%，sodium sulfide excess coefficient 1.2，sodium hydroxide concentra⁃ tion 40 g/L and leaching temperature (51±1) ℃ for 45 min，the antimony leaching rate is more than 97%. Compared with the process before optimization and adjustment，the antimony leaching rate is increased by more than 2 percentage points，and the gold recovery rate of the subsequent roasting cyanidation gold extrac⁃ tion process is increased by more than 0.5 percentage points，which realizes the improvement of quality and efficiency，and the economic benefit is remarkable.
    Comprehensive Recovery of Zinc and Sulfur Removal Products from Iron Concentrate in Longqiao Mining
    DONG Fuzhang LIN Min HUANG Lijinhong ZHANG Wenyi HUANG Wanfu
    2025, 41(05):  137-140，146. 
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    In order to realize the efficient and comprehensive utilization of zinc and sulfur removal products from iron concentrate in the concentrator of Anhui Lujiang Longqiao Mining Co.，Ltd.，based on the study of mineral properties，the comprehensive recovery of zinc and sulfur by flotation process was carried out. The test results show that the zinc and sulfur removal products of the iron concentrate are first grinded and removed reagent，and then the flotation process of zinc and sulfur is adopted. The pH value of the pulp is adjusted by adding lime. The mixture of butyl xanthate and ethyl xanthate（1∶1）is used as collector，and 2# oil is used as foaming agent. After one roughing，two cleaning and two scavenging processes，qualified zinc concentrate and high grade sulfur concentrate are obtained，and satisfactory test indexes are obtained. The purpose of comprehensive recovery of zinc and sulfur is achieved，and the recovery and utilization of re⁃ sources is realized.
    Industrial Test of Ultra-fine Crushing of High Pressure Roller Mill in a Copper Concentrator in China
    YANG Guang WANG Jun LIU Aijun WU Qingcai LI Xiaofeng JIANG He ZHOU Qing
    2025, 41(05):  141-146. 
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    The ore of a copper concentrator in China has high hardness and low grade. In the produc⁃ tion process，the grinding operation capacity is insufficient，and the power consumption and ball consump⁃ tion indicators are high. In order to change the current situation of grinding operation and improve the grind⁃ ing efficiency，the high pressure roller mill ultra-fine crushing operation was added before the ball mill op⁃ eration，and the high pressure roller mill technical transformation was carried out on a grinding series on site. At the same time，another grinding series with the same configuration was used as a reference for com⁃ parison. On the basis of the initial pressure of 5.5 MPa，the ore throughput of not less than 80 t/h and the roller spacing of 16 mm determined by the high pressure roller mill condition test，the relative grindability and Bond work index test indexes of the ore before and after the roller pressure were compared. Finally， the effect of high pressure roller mill operation on the production and consumption reduction of the concen⁃ trator was evaluated from the industrial test level.The test results show that the relative grindability K65 of the corresponding coarse fraction of the raw ore and the roller ore is 1.28~1.47，and the narrow fraction K65 is 1.20；the ball mill work index of the raw ore obtained by the Bond work index test is 18.34 (kW·h)/t， and the roller ore is 15.49 (kW·h)/t，which is reduced by about 15.54%. In the industrial production test， the average efficiency of the reference ball mill is 60.82 t/ h，the unit power consumption of grinding is 12.84 (kW·h)/t，and the unit consumption of steel ball is 0.951 kg/t. After increasing the crushing opera⁃ tion of the high pressure roller mill，the average unit efficiency of the test ball mill is 82.95 t/h，the unitpower consumption of the grinding unit is 9.59 (kW · h)/t，and the unit consumption of the steel ball is 0.699 kg/t，which is 36.39% higher than that of the reference ball mill. The unit power consumption and the unit consumption of the steel ball in the grinding operation are reduced by 25.31% and 26.50%，re⁃ spectively.The unit power consumption of the high pressure roller mill system is 2.34 (kW· h)/t，and the overall power consumption of the test ball mill and the high pressure roller mill system is 11.93 (kW·h)/t， which is 7.09% lower than that of the reference ball mill. Increasing the high pressure roller mill operation significantly improves the mill capacity，reduces the grinding operation cost，and achieves the purpose of energy saving and consumption reduction.
    Process Investigation and Diagnostic Analysis of Grinding and Separation Process in Yanshan Iron Mine
    DENG Yufen WANG Haixia TIAN Yanchun
    2025, 41(05):  147-150，155. 
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    In order to test the operation effect of grinding and separation process of lean magnetite af⁃ ter the transformation of 3# series full-size wet pre-concentration process in Yanshan Iron Mine，the whole process was investigated and analyzed. By means of chemical composition，iron phase and particle size screening analysis，the ore properties，mineral types and contents in each process，monomer dissociation de⁃ gree and the loss trend of useful minerals，gangue minerals and metals in the process are analyzed，and the operation status of each process is comprehensively analyzed and diagnosed. From the perspective of the op⁃ eration effect of the overall process flow，the production status of the 3# series is normal，and the concentrate yield and quality indicators basically meet the design requirements；However，after the overflow of the elu⁃ triation machine returns to the original process through the scavenging concentrate，it will cause problems such as increased circulation，low classification efficiency of the first stage cyclone and anti-enrichment， and there is room for further improvement in technical and economic indicators.
    Desulfurization Test of an Iron Concentrate in Hydrogen Peroxide System
    CHEN Xuan XIONG Liwei TAN Qing ZHANG Yong ZHOU Chao HU Lin
    2025, 41(05):  151-155. 
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    In order to improve the quality of iron concentrate and meet the requirements of low sulfur raw materials for iron and steel smelting，the desulfurization test was carried out with a magnetic iron con⁃ centrate from Daye as the test material and hydrogen peroxide as the oxidant. The effects of hydrogen perox⁃ ide concentration，reaction temperature，sulfuric acid dosage and reaction time on the desulfurization of the iron concentrate were investigated. The results showed that when the solid-liquid ratio is 1∶2，the optimum desulfurization conditions are as follows.The amount of hydrogen peroxide is 20 g，the amount of sulfuric ac⁃ id is 10 g，the reaction temperature is 40 ℃，and the reaction time is 30 min. The results of the cycle test showed that under the condition of ensuring the concentration of hydrogen peroxide，2 g of hydrogen perox⁃ ide is added each time，and the desulfurization rate is still maintained at a high level. Finally，the sulfur content in the iron concentrate is reduced to 0.2%，and the iron recovery rate is 97%.
    Analysis and Evaluation on the Final Slope Stability of an Open-pit Limestone Mine
    WU Xianzhen DONG Enrui LIU Jianwei YANG Yang LIU Xiangxin
    2025, 41(05):  156-160，170. 
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    The preliminary design of a limestone mine has been completed. Because the final slope height of the western slope of the mining area is nearly 200 m，in order to ensure the safety and efficient pro⁃ duction of the mine，it is urgent to carry out in-depth analysis on the stability of the final slope in the west⁃ ern part of the mining area. Through the sampling of rock mass in the mining area and the rock mechanics test，the basic rock mechanics parameters of limestone are obtained. Using the limit equilibrium method， the calculation equation of the stability coefficient of the plane sliding rock slope is derived，and the stabili⁃ ty of the final slope of the limestone mine is systematically analyzed by using the stereographic projection graphic method and ANSYS numerical simulation，and then the safety factor under different final slope an⁃ gles is obtained. Considering the safety and economic benefits of the mining area，it is reasonable to deter⁃ mine the final slope angle of 51°. It is found that the slope stability coefficient obtained by the limit equilibri⁃ um method equation and numerical simulation decreases with the increase of the final slope angle. There⁃ fore，under the premise of ensuring safety，the final slope angle can be appropriately optimized and adjusted to achieve both safety and resource utilization.
    Research on Simple Calculation Method of Flood Process Line of Tailings Reservoir
    CHEN Guoqiang, FANG Songgen,
    2025, 41(05):  161-164，170. 
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    为提升尾矿库特小流域洪水计算精度，优化调洪设计安全性，解决传统方法中暴雨衰 减指数适配性不足、洪水过程线简化不合理、特小流域产汇流参数计算误差大等问题，开展了基于推 理公式法的参数体系优化与多峰洪水过程线重构研究。通过建立暴雨衰减指数的三段动态校正模 型，损失率的双源交互验证算法以及汇流参数的区域化修正方法，创新性提出五段式多峰三角形叠 加模型，并研发 Python自动计算模块。研究结果表明，通过划分主雨峰与次雨峰时段并引入迭代试 算机制，洪峰流量计算误差可控制在 5% 以内；采用 Python 编程实现算法模块化后，计算效率提升 80% 以上；改进的推理公式法可有效解决特小流域参数适配性问题，多峰三角形叠加方法简化了洪 水过程线构建流程，对缺乏实测数据的尾矿库工程具有显著实用价值。洪水过程线计算方法对特小 流域洪水计算工程的适用性强，可用于尾矿库的防洪复核。
    Study on Failure Law of Floor in Double-unit Mining of Ultra-wide Working Face with Roof Cutting and Pressure Relief
    WU Tao GAO Derui LI Yanlei HAN Xu DONG Ya LIU Chao
    2025, 41(05):  165-170. 
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    The failure of mining floor is the key factor to conduct confined aquifer and induce floor wa⁃ ter inrush. In order to analyze the stress distribution of ultra-wide working face and reveal the failure mecha⁃ nism of floor strata，the 21609 working face in Binhu Coal Mine is taken as the research object，and the fail⁃ ure law of working face before and after roof cutting and pressure relief is analyzed by using mine pressure theory and numerical simulation. The results show that the working face tension mining will cause repetitive disturbance to the floor strata，and stress concentration occurs at the end of the rear working face. After roof cutting and pressure relief，the plastic zone range，vertical stress，maximum principal stress，maximum shear stress，pore water pressure and displacement of coal seam floor are significantly lower than those be⁃ fore roof cutting and pressure relief，and the concentration effect of mine pressure is weakened，which effec⁃ tively reduces the failure depth of floor，and is of great significance to the prevention and control of floor wa⁃ ter damage in super wide working face mining on confined aquifer.
    Electrical Characteristics and Prospecting Significance of Pyrite and Chalcopyrite in the S-Fe-Au-Cu Deposit in Huangtun，Anhui Province
    ZHAO Yongjian WANG Haoyang ZHANG Mengmeng SHEN Junfeng CHEN Qiang
    2025, 41(05):  171-176. 
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    The Huangtun S-Fe-Au-Cu deposit in Lujiang County，Anhui Province is located on the northeastern margin of the Luzong Basin in the middle and lower reaches of the Yangtze River mineralization belt. It is originally a large pyrite deposit. In recent years，a thick and large hidden explosive breccia-type gold and copper deposit has been newly discovered，which is the first deposit of this type in the Luzong Ba⁃ sin. The discovery of the new ore body has enriched the types of ore deposits in the Luzong Basin and provid⁃ ed new inspirations for the exploration of gold and copper in the region. Based on the study of the basic char⁃ acteristics of the deposit，a total of 220 samples of ore/altered rock from 9 boreholes in the mining area were collected. The thermoelectric and thermal resistance characteristics of pyrite and chalcopyrite inside and out⁃ side the hidden explosion breccia cylinder in the Huangtun mining area were studied by using the mineral thermoelectric instrument and thermal resistance instrument system. The results show that with the increase of activation temperature (50~80 ℃)，there is a 95% probability that the thermoelectric characteristics of the sample chalcopyrite measurement points in the hidden explosion breccia cylinder will disappear，while this phenomenon does not occur in the thermoelectric properties of chalcopyrite outside the hidden explosion breccia cylinder. Compared with the thermal resistance ranges of pyrite and chalcopyrite outside the breccia cylinder (0~10 Ω·m and 0~5 Ω·m respectively)，the thermal resistance rate ranges of pyrite and chalcopy⁃ rite inside the breccia cylinder are significantly broader (0~40 Ω·m and 0~25 Ω·m respectively). There⁃ fore，based on the electrical characteristics of pyrite and chalcopyrite，it is possible to effectively identify py⁃ rite and chalcopyrite under the mineralization conditions of regional hidden explosion breccia. This is of great guiding significance for further searching for hidden explosion breccia-type gold and copper mineral⁃ ization in the Huangtun mining area and even the Luzong Basin，and it also has reference significance for discovering new mineralization clues in the Luzong Basin.
    Study on the Magnetic Field Characteristics of Different Components of Cement-based Materials under Load Failure
    YELIJIANG Anaerbieke LI Jie LU Junying TIAN Maoxin
    2025, 41(05):  177-182. 
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    In order to explore the influence of iron powder，fly ash and quartz sand on the mechanical properties and magnetic field response of cement-based materials，the correlation between the compressive strength and the peak value of magnetic induction intensity of materials with different contents（5%~15%） was systematically studied by uniaxial compression test and magnetic field monitoring. The results show that the peak values of compressive strength and magnetic induction strength of iron powder and fly ash modified materials increase first and then decrease with the increase of dosage，and the peak value appears when the dosage is 10%. Quartz sand leads to a continuous decline of the both with the increase of dosage，and the performance is the best when the dosage is 5%. Linear regression analysis showed that there was a signifi⁃ cant linear positive correlation between the compressive strength and the peak magnetic induction intensity of the three materials，indicating that the microstructure and stress evolution had a regulatory effect on the mechanical-magnetic field coupling behavior. The research confirms that the magnetic field characteristics of the material failure process can characterize the mechanical degradation law，which can provide a theoret⁃ ical basis for structural health monitoring and material optimization design of multi-physical field coupling.
    DOI：10.3969/j.issn.1674-6082.2025.05.039 Disaster Characteristics and Prevention Technology of Gob-side Entry Retaining with Roof Cutting in Spontaneous Combustion Thick Coal Seam of a Mine
    SHAO Wenqi YANG Xipei ZHANG Guojun HE Fuquan
    2025, 41(05):  183-190，199. 
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    In order to deeply understand the characteristics of coal spontaneous combustion in goaf of gob-side entry retaining in thick coal seam with easy spontaneous combustion，taking 30109 fully mecha⁃ nized caving face of Wuhushan Coal Mine as the research object，the numerical simulation model of coal spontaneous combustion in goaf is constructed，and the gas migration law and coal spontaneous combustion characteristics in goaf of gob-side entry retaining are numerically simulated and analyzed. Based on the con⁃ clusion of numerical simulation，the targeted control measures of gas overrun in the upper corner of 30109 working face，the prevention and control measures of coal spontaneous combustion in goaf and the safety monitoring measures are formulated. The results show that the buried pipe drainage in the upper corner of the working face can effectively control the gas overrun，and different buried depths correspond to different optimal drainage flow rates，and the two approximately satisfy the positive exponential function relationship. The air volume and air leakage rate of the working face and the gob-side entry retaining are the main factors affecting the spontaneous combustion of coal in the goaf. The air supply volume of the working face has a qua⁃ dratic parabolic function relationship with the width of the heat dissipation zone and the width of the oxida⁃ tion zone in the goaf. The goaf near the gob-side entry retaining and the corresponding goaf of the tail road⁃ way are the areas with high risk of coal spontaneous combustion. Comprehensive prevention and control mea⁃ sures can effectively avoid spontaneous combustion of coal in goaf of gob-side entry retaining in thick coal seam with easy spontaneous combustion. The research results can provide theoretical guidance and practical reference for the prevention and control of coal spontaneous combustion in goaf under similar conditions.
    Application of Ground Directional Drilling Area Grouting Technology for Management of Floor Pressure Water Disaster
    DU Haohui WANG Ding, GUO Bingbing LI Xuanlin XUE Jiale
    2025, 41(05):  191-194，199. 
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    The Ordovician and Taiyuan Group karst aquifers at the bottom of the coal measures in the North China-type coalfield have strong water abundance，high water pressure，and thin aquifuge. The confined water seriously threatens the safety production of coal mining enterprises. Based on the back⁃ ground of the mining face with pressure in a mine，it is analyzed that the water inrush coefficient of the floor of the 9303 working face is 0.094~0.126 MPa/m，and the mining will be threatened by confined wa⁃ ter damage. The ground directional drilling area grouting technology is used to carry out treatment for the target aquifer of 12~30 m below the top surface of Ordovician limestone. The results show that the thick⁃ ness of the aquifuge is increased by 45.22~64.60 m，and the water inrush coefficient is reduced to 0.073~ 0.085 MPa/m，which meets the requirements of the industry standard and realizes the safe mining above the confined water.
    Geological Environment Problems Analysis and Prevention Countermeasures of Acid Waste Water in a Stone Coal Mine in Qinba Mountains Area
    ZHAO Shujun YANG Min FU Weishun CAI Zongming YU Junjiang
    2025, 41(05):  195-199. 
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    Qinba Mountains area is an important stone coal producing area in China. It is rich in stone coal resources and has a long history of mining. However，non-standard mining activities in history have led to a series of ecological and environmental problems，especially the problem of acidic wastewater in aban⁃ doned mines. In order to explore the solution to the problem of acid water geological environment in Qinba Mountains area，the acid water samples in the study area are collected on the spot. The heavy metal content of water samples is measured by photoelectric colorimetry and chemical titration. The surface water environ⁃ ment quality in the study area is evaluated by single index method and Nemero index method. The results showed that the over standard rate of Pb，Cu，Cr6+ and Cd in the surface water of the basin is 100%，65%， 25% and 100%，respectively，and there is a large amount of iron and aluminum enrichment. The causes of acid water in mines and the influence of acid water on local residents and aquatic organisms are further ana⁃ lyzed，and a two-way linkage treatment scheme of source reduction and end treatment is proposed.
    Study on Ecological Restoration Practice of Yangmeiling Block in Lengshuijiang Antimony Coal Mine Area
    LUO Bin
    2025, 41(05):  200-204. 
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    In order to improve the situation of serious loss of ecological environment function in Lengshuijiang antimony coal mining area in Loudi City，Hunan Province，aiming at the problems of soil heavy metal pollution，low vegetation coverage and large amount of soil and water loss in the mining area， the ecological reconstruction of Yangmeiling block in Lengshuijiang antimony mine was studied. By applying a series of key technologies of geological stabilization-soil improvement-biocommunity reconstruction to lo⁃ cal land remediation，organic-inorganic composite soil remediation，arbor-shrub-herb composite communi⁃ ty construction (camphor-oleander-bermudagrass) and constructed wetland purification，the vegetation cov⁃ erage rate increased to 87%，the amount of soil erosion was reduced by 70%，and the Sb concentration in the water body reached the standard (Sb≤0.1 mg/L)，which improved the ecological environment of the min⁃ ing area and enhanced the stability of the ecosystem.
    Problems and Its Countermeasures of Safety Production Management in Non-coal Mines
    SUN Fengyang ZHANG Chuanzhi
    2025, 41(05):  205-208. 
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    In order to improve the efficiency cunent situation and reduce the incidence of accident risks，cunent situation is analyzed the core crux of the current constraints on safety production is revealed. First，there is an institutional shortcoming of "multiple management and unclear responsibilities" in safety supervision. Second，the social supervision channels and incentive and restraint mechanisms are dual lacked；Third，the main responsibility of enterprise safety production is implementation. In view of the above problems，integrated solutions were put forward，laws and regulations and dynamic standard mecha⁃ nismswere improved，a quantitative evaluation system of subject responsibility was established，an intelli⁃ gent supervision platform and cross-departmental coordination mechanism was constructed，the integration of '5G+industrial Internet' full-scene technology was deepened，a 'management-technology' compound tal⁃ ent training plan was implemented，and industry autonomy was strengthened through the establishment of professional committees.These countermeasures contribute to build a modern mine safety governance sys⁃ tem.
    Safety Management Problems and Countermeasures Analysis of Gushan Mining，Masteel
    DONG Zhen SHEN Bin
    2025, 41(05):  209-212. 
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    In order to ensure the stable safety production situation of Gushan Mining Co.，Ltd.，Anhui Masteel Mining Resources Group，and realize the safe and high-quality development of the company，sys⁃ tematically analyzes and summarizes the problems existing in the company's safety management ability， safety management team，safety science and technology level，major risk management and control，dual pre⁃ vention mechanism construction，responsibility investigation and so on，and puts forward corresponding measures to prevent production safety accidents，so as to ensure the company's safety production，improve the level of enterprise safety management，and provide reference for decision-making departments.
    The Formation，Hazards and Chemical Treatment of Acidic Wastewater from A Certain Iron Mine
    ZHU Zaidong WANG Shaoping
    2025, 41(05):  213-217. 
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    In order to realize the vision of building a beautiful，ecological and green mine，and treat the acid water pit in the mine more scientifically，economically and efficiently，research on the re-under⁃ standing and treatment technology of acid water in the reservoir has been carried out at a certain iron mine in Maanshan City cooperation with universities and other institutions. The results showed that: ① The physico⁃ chemical indicators of water in different layers of the acid water pit vary significantly，and the overall trend is a gradual change; The pH value of the water body ranges from 3.33 to 3.69 and increases with the increase of water depth. The dissolved oxygen and oxidation-reduction potential of the surface water are relatively high，while the contents of nutrients such as nitrogen and phosphorus and the concentrations of metal ions are relatively low. There is a small amount of organic matter dissolved in the acid water.② The high-pres⁃ sure seepage and direct discharge of acid water will pollute groundwater and downstream water systems，cor⁃ rode the equipment and flow-through parts it comes into contact with，thereby increasing the frequency of maintenance and inspection and production costs，and endangering the healthy growth of humans，animals and plants. ③ When treating acid water with 10% lime milk，compared with the on-site single-stage neu⁃ tralization treatment process，the staged treatment process is more convenient to operate and manage，has a lower production cost，and can solve the problem of the manganese ion concentration in the effluent from the on-site process not meeting the standard. The precipitate is a non -toxic general Class I industrial solid waste，and there is no secondary pollution problem when it is landfilled in a Class I landfill. ④ The rich and diverse microorganisms in water bodies are one of the key factors in increasing the dissolved oxygen concen⁃ tration in water，accelerating the oxidation of ferrous ions and the hydrolysis and precipitation of trivalent iron，and reducing the pH value of water. They also have the ability to slowly adsorb and precipitate heavy metal ions. Seasonal temperature changes mainly indirectly affect the physical and chemical indicators of wa⁃ ter bodies by influencing the activity of microorganisms. To accelerate the in-situ self-repair ability of acid water pits，it is of great significance to input reasonable exogenous organic matter. Research showed that the staged treatment process combined with in-situ microbial remediation technology is a green，environmental⁃ ly friendly and low-cost process for the treatment of acidic wastewater in mines.
    Survey and Risk Assessment of Hidden Disaster Causing Factors in a Certain Iron Mine
    YU Liuping, LIN Min YANG Haifeng
    2025, 41(05):  218-221. 
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    In order to effectively prevent and resolve major safety risks in mines，and to address the identification and risk control of hidden disaster causing factors in Longqiao Iron Mine，geophysical explora⁃ tion，drilling，3D laser scanning and other technical means are used to conduct a comprehensive survey of hidden disaster causing factors in the production area，planning area and other areas of the mine，covering goaf，geological structure，water sources and channels，ground pressure activity areas，fire areas/high-tem⁃ perature abnormal areas，etc. By comprehensively analyzing the census results，the risk matrix rating method is used to evaluate the risks of disasters in mines，and corresponding disaster risk control measures are pro⁃ posed. The census results show that there are incomplete filling areas in the large voids caused by the col⁃ lapse method in the early stage，and it is necessary to strengthen filling management and real-time monitor⁃ ing；The southeastern fault structures and fractured water rich areas in the mining area pose a significant risk of water hazards，and it is necessary to strengthen advanced water exploration and grouting sealing；The deep mineral rock mass exhibits a weak tendency towards rock burst，but the overall ground pressure activi⁃ ty is stable；The ore has low spontaneous combustion and a complete fire protection system. By comprehen⁃ sively applying various census methods and risk assessment techniques，hidden disaster causing factors in mines have been effectively identified and controlled，and the level of mine safety production management has been improved.
    Research and Application of Mobile Crushing and Dry Separation Technology in Sijiaying Iron Mine
    HU Zhenpeng LI Wantao LI Haiyang LI Xiaolong JIANG De YIN Lei
    2025, 41(05):  222-225. 
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    In order to solve the problem of low grade of shovel-loaded raw ore after blasting caused by interlayer superposition of ore and rock in Sijiaying Iron Mine，the ore and rock separation test was carried out with the help of fixed secondary dry separation equipment in the stope. The test data show that the dry separation technology has a certain effect on the ore and rock mixture. Therefore，a mobile crushing dry sep⁃ aration equipment suitable for open-pit stope is developed，and the ore and rock mixture is separated and the process is optimized from the source of shoveling. The field application results show that when the mobile crushing and dry separation technology is used to treat the ore and rock mixture with an iron grade of about 15%，the concentrate grade can reach 24%，the ore yield can reach more than 50%，and the production cost of fine powder can be reduced by 6.02 yuan/t，which realizes the increase of production and the reduc⁃ tion of cost. It provides an effective way for the sustainable development of the mine and has popularization and application value for other mines.
    Application of GNSS Monitoring Technology in the Study of Hequ Open-pit Slope Stability
    LI Zhefeng
    2025, 41(05):  226-229. 
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    With the continuous development and utilization of coal resources，the slope stability of deep open-pit mine has become a major problem in slope engineering. Aiming at the low and gentle slope with small radian，GNSS on-line monitoring technology is used to establish the slope monitoring system of Hequ Open-pit Mine. By analyzing the monitoring data of each monitoring line of the slope，the slope stabili⁃ ty is evaluated and analyzed. The results show that the current slope in the mining area is basically in a sta⁃ ble state，but the displacement change value of some monitoring points fluctuates greatly. Under the influ⁃ ence of external factors，such as rainwater，freezing and thawing，spontaneous combustion of coal seam， normal operation interference and other factors，there is a possibility of landslide. According to the research results，corresponding treatment suggestions are put forward for different regions，which provides a basis for the prevention and control of slope stability in the future.
    Application of Analytic Hierarchy Process in Blasting Cost Management of Large Mines
    FANG Yuyihao ZHANG Zhiqiang YU Taipeng
    2025, 41(05):  230-234. 
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    With the rapid development of economy，mining enterprises have higher and higher re⁃ quirements for the comprehensive management level of engineering projects，especially cost management and resource optimization. Combined with a large mine，using analytic hierarchy process (AHP) and SPSSPRO analysis software，the weight comparison and data analysis of the eight factors that mainly affect cost management and resource optimization are carried out through expert subjective assignment. The results show that the weight value of the mesh parameters in the eight main influencing factors reaches more than 20%，which should be considered in the process of resource allocation optimization. The second is the charge structure and the detonation network，and the weight ratio of the two is about 15%. Therefore，in or⁃ der to obtain better blasting effect，more refined cost management is needed. Safety investment also has a greater impact on cost management，reaching about 30%. The research results can provide theoretical basis and parameter reference for how to efficiently allocate resources and refine management costs for related en⁃ gineering projects，so as to optimize the cost management of construction projects.
    Research and Application of Detection Method for Hoist Skip Hook Based on MachineVision
    ZHANG Dejun, BI Xiufen SANG Jinguo
    2025, 41(05):  235-238. 
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    As an important equipment in mine production，the operation efficiency and stability of mine hoist directly affect mine productivity and safety. In order to solve the existing problems in energy sav⁃ ing and safety of mine hoist，a new power consumption model is proposed by analyzing the working principle of the hoist and identifying the main links and influencing factors of power consumption to systematically evaluate and compare different energy-saving measures. Based on artificial intelligence and machine vision technology，a series of improvement measures are proposed to improve the efficiency of the hoist，reduce en⁃ ergy consumption，and ensure worker safety. In terms of research methods，the machine vision technology is used to carry out real-time detection of the running state of the skip hook of the hoist，including the use of YOLOv7 for target detection，Segment Anything for example segmentation，and OpenCV for graph process⁃ ing and Angle calculation. By these technologies，the status of the hook can be analyzed in real time，and abnormal conditions can be warned and stopped in time，thus effectively avoiding potential safety risks. The research results show that the system can significantly improve the safety and automation level of the hoist， can more accurately detect the hook status，and timely alarm in abnormal circumstances，reduce the possi⁃ bility of accidents，and provide a certain reference for related research and mines.
    Cause Analysis and Prevention Measures of Chute Blockage in Zhongguan Iron Mine
    SUN Dingding, GENG Shuai, YIN Aimin, GAO Guangyu,
    2025, 41(05):  239-242. 
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    The chute in the underground mining area is an important channel to communicate the ore drawing and transportation in the middle section of the stope. The frequent occurrence of chute blockage seri⁃ ously affects the normal production. At the same time，the treatment of chute blockage is often difficult and dangerous，and there is a great potential safety hazard. In order to deal with the problem of chute blockage in mining area safely and efficiently，the problems of underground hydrogeology，ore rock properties，chute structure，grid sieve size and use management of Zhongguan Iron Mine are analyzed. The results show that powder ore and water are the main reasons for the blockage of the chute in the mining area，followed by large ore and debris into the well. In the working practice，three methods of treating chute blockage，such as re⁃ mote vibration ore drawing，blasting vibration and hydraulic scouring are summarized. Various measures to prevent chute blockage in mining area are put forward，and good results have been achieved in field applica⁃ tion.