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    25 June 2025, Volume 41 Issue 06
    Previous Issue   
    Research Status and Development Trend of the Waste Dump in Open-pit Mine
    PANG Bo JIN Shukai, WANG Yukai WANG Shuai WANG Di XIA Hongbo LUO Zhixiong
    2025, 41(06):  1-6. 
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    The open-pit mine dump is a place where the mining waste of open-pit mine is concentrat⁃ ed. The research on the stability of the dump and disaster prevention and control is not only related to the safe production and economic benefits of the mine，but also has an important impact on ecological protec⁃ tion，people's livelihood safety and social stability. By using the methods of literature retrieval analysis， summary and trend prediction，this paper studies the open-pit mine dump from three aspects : research sta⁃ tus，main problems and countermeasures，development trend and prospect. The results show that the stabili⁃ ty of the dump is mainly affected by the mechanical properties of granular materials，base strength，stacking parameters and water. The stability analysis methods of the dump mainly include limit equilibrium method and numerical simulation method. The disaster prevention and control of the dump is mainly reflected in three aspects : water source drainage，optimization of dumping process and construction of retaining struc⁃ ture. Reclamation mode，soil properties of reclamation area and types of reclaimed vegetation are also the fo⁃ cus of current dump research. The stability of the dump is mainly affected by the mechanical properties of granular materials，base strength，stacking parameters and water. There are some main problems in the study of open-pit mine dump slope，such as the inconsistency between the simulation results and the actual situation，the stability of ultra-high bench and soft basement dumping，and the lag of environmental protec⁃ tion. A research method of dump deformation based on the dynamic change of particle force chain network is proposed. The development trend of waste dump is mainly reflected in the joint stacking of waste dump and tailings pond，large-scale waste dump equipment，intelligent monitoring equipment and comprehensive uti⁃ lization of waste rock. The above results can provide reference and guidance for the development of mine dumping engineering.
    Research on Current Situation，Risks and Development Strategies of Natural Uranium Transportation Safety
    HAN Jie
    2025, 41(06):  7-11，20. 
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    Natural uranium，as the core resource of nuclear fuel，the safety level of its transportation is of prominent significance to the utilization of nuclear energy，public safety and environmental protection. The transportation process of natural uranium is complex，involving various transportation means such as roads，railways and sea transportation，and facing multi-dimensional risks such as radiation protection，en⁃ vironmental safety and security. The research sorted out and summarized the current situation of the safety of natural uranium transportation，analyzed the transportation channels，policy regulations and regulatory sys⁃ tems，dissected typical accident cases，summarized the progress trends of key technologies，and discussed the future development paths. The transportation technology of natural uranium is constantly improving，and international transportation regulations are gradually being unified. However，safety incidents are still main⁃ ly caused by human factors or packaging defects. Intelligent monitoring means，international cooperation and regulatory coordination should be further enhanced to effectively raise the safety level of natural uranium transportation.
    Influencing Factors Analysis and Research Strategies of Production Safety Accidents in Zhejiang Province
    WANG Lili LI Wei WANG Huimin SHI Yongguo
    2025, 41(06):  12-20. 
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    By focusing on the large and above-level production safety accidents in Zhejiang Province， this paper systematically analyzes the law of accident occurrence，deeply explores the causes of accidents， and aims to put forward targeted prevention and control strategies. In terms of research methods，statistical analysis and case induction are comprehensively used to analyze the eight core accident factors. The study found that human factors dominate the accidents caused by various industries，followed by education and training factors，highlighting the serious challenges posed by human errors and lack of knowledge and skills to safety production. Environmental factors and equipment and facilities also significantly increased as an important cause of frequent accidents. Based on the above research results，the corresponding countermea⁃ sures and suggestions for accident research are put forward. The first is to build an expert database，gather top wisdom inside and outside the industry，and provide professional guidance and technical support for safe production. The second is to build a safety production database，realize the comprehensive integration and deep mining of accident information with the help of big data technology，and provide scientific basis for ac⁃ cident prevention and emergency response. The third is to emphasize the technical support ability of deepen⁃ ing the analysis and research of accident causes and accident investigation，so as to effectively promote the improvement and implementation of safety production management system with comprehensive measures， and further ensure the safety and stability of production activities. In the future，through technical empower⁃ment and innovative application，social participation and responsibility implementation，deepening acci⁃ dent investigation and research，information sharing and collaborative cooperation，publicity and education and capacity building，strengthening domestic and foreign exchanges and cooperation and other measures to promote the improvement and implementation of the safety production management system in Zhejiang Prov⁃ ince，further ensure the safety and stability of production activities，and provide useful reference for the con⁃ tinuous and stable improvement of China 's safety production situation.
    Research on Three-dimensional Visualization of Dynamic Process of Geological Disasters Based on C# and Direct 3D Technology
    ZHANG Zhihai PANG Ganggang
    2025, 41(06):  21-28，35. 
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    Three-dimensional visualization technology plays an important role in the dynamic analysis of geological disasters. In order to improve the understanding of geological disasters such as landslides and debris flows and predict their potential hazards，a three-dimensional visualization application based on C# and Direct3D technology has been developed. This application is based on the theory of deep integral contin⁃ uum mechanics and combines the disaster dynamics calculation software Massflow to simulate the dynamic process of geological disasters. It can present geological disaster information in the form of three-dimension⁃ al images to achieve data visualization，including the real-time animation display of information such as the height and speed of the moving body of geological disasters at different times. By comparing with actual cas⁃ es，the simulation results show a high degree of consistency，verifying the accuracy and reliability of this technology in describing the potential hazard range during the movement of landslides and debris flows. In addition，this software has potential application value in disaster early warning，providing a new tool for di⁃ saster early warning and science popularization. It is of great significance for the prevention of geological di⁃ sasters and can offer strong technical support for research and practice in related fields.
    Application of Edge Computing Technology in Intelligent Mine Construction
    ZHONG Yiming, ZHONG Wenbin WANGYANG Peihua, QI Yangjun YANG Ronggui, LU Xiangao, BAI Xiaojun MAO Guobin WANG Xiaogang NI Yuchuan
    2025, 41(06):  29-35. 
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    With the deepening of the construction of smart mines，the traditional centralized cloud computing architecture faces challenges such as response delay and insufficient computing power in massive heterogeneous data processing. An intelligent mine data processing system architecture based on edge com⁃ puting technology is proposed. Through the sinking of computing resources and distributed intelligence，the real-time monitoring，efficient processing and safe storage of mine environmental data are realized. The sys⁃ tem adopts a three-tier distributed architecture，including smart terminal layer，edge computing layer and smart cloud. The intelligent terminal layer ensures the reliability of data transmission in complex environ⁃ ments through multi-network fusion technologies (LoRaWAN，WIFI，5G/4G and Beidou satellite communi⁃ cation). As the core hub，the edge computing layer relies on the edge gateway to realize data acquisition， preprocessing，anomaly detection (such as isolated forest algorithm) and local storage，which significantly reduces latency and improves security. The smart cloud integrates multi-source data and supports decision management through a visual interface. Typical application scenarios (environmental monitoring，slope warn⁃ ing，and personnel positioning) verify the effectiveness of the system in improving production efficiency and ensuring safe production. The edge computing technology can effectively solve the problems of real-time， stability and security of data in the construction of intelligent mines，and provide an innovative solution for the intelligent transformation of mines.
    Research and Application of Intelligent Truck Scheduling System in Luming Mine
    YANG Jiaquan ZHOU Tong WANG Shuangsheng
    2025, 41(06):  36-42，49. 
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    At present，most of the open-pit mines in China still adopt the traditional manual schedul⁃ ing method，which has the problems of low production efficiency，high safety risk and high operating cost. In response to these problems，Luming Mining Co.，Ltd. developed and applied an intelligent truck sched⁃ uling system. The system integrates modern communication technology，satellite positioning technology，ar⁃ tificial intelligence technology and other technologies to realize the intelligence and automation of mine pro⁃ duction scheduling. The system consists of four parts including mobile vehicle terminal，intelligent schedul⁃ ing software，intelligent auxiliary terminal and production scene maintenance system. It has the functions of real-time monitoring，dynamic scheduling，safety warning，data traceability and so on. The practical ap⁃ plication shows that the system significantly improves the production efficiency of the mine，reduces the transportation cost and safety risk，and provides an effective solution for the digital and intelligent transfor⁃ mation of open-pit mines.
    Analysis of the Safety Impact of Underground Filling Mining on Open-pit Waste Dump
    TIAN Jinquan
    2025, 41(06):  43-49. 
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    Underground mining may induce the movement of rock strata，leading to the instability of the waste dump and threatening the safety of the mining area. To achieve the goal of balancing safety and economy，a numerical simulation method is adopted to analyze the influence of filling mining on the stabili⁃ ty of the waste dump and demonstrate the feasibility of the collaborative layout. Based on the geological ex⁃ ploration data and mining design of the mining area，a three-dimensional numerical model including open�pit waste dumps，underground stopes and filling bodies was constructed to simulate the deformation law of rock mass under different filling body strength（0.5~2.5 MPa）working conditions. The model adopts the Mohr-Coulomb criterion，sets the staged underground mining and the strength gradient change of the filling body. The model focuses on monitoring the displacement field，stress field，plastic zone expansion of the waste dump and the roof settlement of the underground stope. The quantitative relationship between the strength and stability of the filling body is established through the comparison of multiple working condi⁃ tions. The results show that: ①In terms of horizontal deformation，the horizontal deformation in the X/Y di⁃ rection has low sensitivity to the strength of the filling body（0.5~2.5 MPa），and the maximum tensioning values are 80 and 120 mm respectively; In terms of settlement control，the settlement in the Z direction is affected by the strength of the filling body. When the strength is 0.5~1.0 MPa，the maximum settlement eaches 155~212 mm. When the strength is 1.5~2.5 MPa，the settlement amount drops to 142~136 mm. When the strength is greater than 1.5 MPa，the decrease in settlement slows down（only reducing by 6 mm）. ② In terms of shear strain and stress field，the strength variation of the filling body has a weak influence on the shear strain increment and the distribution of the surface stress field of the waste dump. The shear strain increment is basically consistent with the original state，indicating that the main controlling factor for the base deformation of the waste dump is vertical settlement. ③ In terms of the plastic zone and stability，when the strength of the filling body is not less than 0.5 MPa，the range of the plastic zone of the waste dump and the formation is relatively small，and the influence on the overall stability is controllable. ④Regarding the roof settlement of the stope，the roof settlement shows a decreasing trend with the increase of the strength of the filling body. The extreme values of settlement are all located directly beneath the waste dump，revealing that the load of the waste dump has a reverse disturbance effect on underground mining. By controlling the strength of the filling body to be no less than 1.5 MPa and setting up open-pit waste dumps within the mobile zone，the coordinated and safe mining of open-pit and underground can be achieved.
    Study on Triaxial Mechanical Behavior and Internal Crack Evolution Characteristics of Non-coplanar Double-fractured Coal Rock
    ZHAO Renbao DING Li ZHENG Yining LIU Fei ZHANG Peng WANG Minghui
    2025, 41(06):  50-54. 
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    With the increasing depth of mine excavation，the problem of working face instability caused by confining pressure and natural defects has become a hot topic. Based on the indoor mechanical test and discrete element numerical method，the mechanical strength，deformation characteristics，failure mode and internal crack evolution law of non-coplanar double-fractured coal rock with under different con⁃ fining pressures are analyzed for the coal samples of Hepan Coal Mine in Shenmu City，Shaanxi Province. The results show that the mechanical properties of coal and rock meet the Mohr-Coulomb criterion. With the increase of confining pressure，the peak strength and peak strain increase linearly. The non-coplanar dou⁃ ble fractures with different rock bridge angles have obvious deterioration effect on the mechanical parame⁃ ters of coal rock. When the rock bridge angle is 0°，30°，60°，90°and 120°，the peak strength of coal sam⁃ ples decreases by 16.4%，14.2%，26.4%，38.5% and 19.8%，respectively. Compared with the rock bridge angle，the confining pressure has a greater influence on the failure mode of the sample. With the increase of confining pressure，the coal sample changes from tensile-mixed tensile-shear failure to shear failure，and the coal rock changes from brittle failure to ductile failure. In addition，the number of cracks is also affected by the confining pressure and the dip angle of rock bridge. The research results provide certain guiding for the safety and stability of deep mine mining.
    Study on Blasting Mining Technology of Complex Boundary Pillar Stope in Jinchanghe Mine
    ZHAO Liang LUO Zhengliang ZHANG Zengqing ZENG Yi WEI Xiaoming
    2025, 41(06):  55-59，66. 
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    Jinchanghe Polymetallic Mine has gradually entered the two-step pillar stope mining stage. In view of the complex boundary problems formed by the one-step stope，the roof collapse investigation and filling body quality evaluation of 21# and 23# stopes are carried out. With the help of GEOSLAM mobile three-dimensional laser scanner，the goafs on both sides of the two-step pillar stope are detected，and the boundary range of the 22# pillar stope is accurately obtained. By dividing the two-step pillar stope into three ore sections，and implementing the basic principles of weak mining，strong output and strong filling under the system of shrinkage blasting during blasting mining，the reasonable caving method，blast hole layout and hole network parameters，initiation mode and charging structure of 22# pillar stope are determined. The field construction shows that the blasting effect of 22# pillar stope is good and the filling bodies on both sides are stable，which greatly improves the safety of pillar stope. It can provide reference for blasting mining de⁃ sign of pillar stope with complex boundary in similar mines.
    Research on Stability of Roof Filling Body in Large Section Approach Road in Jinchuan No. 2 Mining Area
    LI Yanlong CHEN Zhongjie DUAN Wenquan WANG Xin WU Chen WANG Shuaishuai CHANG Hao XING Chengjie ZHANG Ming
    2025, 41(06):  60-66. 
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    The bearing and supporting effect of the roof filling body is the key factor to maintain the stability of the stope in the process of underground stope. In order to further improve the parameters of min⁃ ing path in deep mining area of Jinchuan No. 2 mining area，the simple supported beam calculation model is adopted to carry out theoretical analysis on the stability of the roof of the road after expanding the section， and carry out field measurement of the stress deformation of the roof filling body of the downward approach in Jinchuan No. 2 mining area，and verify the maximum distributed load value and stress characteristics of the roof filling body of the road with different structural parameters during mining. The evolution law of stress and deformation of roof filling body during mining is revealed. The results show that the tensile stress of the bottom surface of the roof filling body is negatively correlated with the thickness of the bearing layer，and positively correlated with the width of the approach and the overlying load. When the width of the road is ex⁃ panded from 5 m to 6 m，the maximum tensile force of the hanging bar in the roof filling body is 17.38 kN， and the maximum tensile force of the main bar in the bottom network is 10.02 kN，which is less than the lim⁃it tensile force of the steel bar with a diameter of 12 mm，and the load rate is 51.1%，which is in a benign load state. The maximum tensile stress of the roof backfill in the horizontal plane perpendicular to the axial direction of the road increases from 0.220 8 MPa to 0.269 9 MPa，which is less than the ultimate tensile strength of the backfill body 0.53 MPa，indicating that the cemented backfill in the large section under the road roof will not be unstable and fail. The study can provide theoretical guidance for the stability of the stop⁃ ing road roof filling body and the design of the road section parameters.
    Practice of High Water Filling Gob-side Entry Retaining in 182605 Lower Meterial Transport Roadway of Wutongzhuang Mine
    HUO Leilei
    2025, 41(06):  67-72. 
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    To improve the recovery rate of coal resources and alleviate the tense situation of mining and excavation succession in Wutongzhuang Mine，a technical practice of high water filling gob-side entry retaining was carried out in the lower material transportation roadway 182605 of Wutongzhuang Mine. Through technologies such as advanced reinforcement and support，high-water filling and roof cutting and pressure relief，the support strength of the roadway has been significantly increased，and the ability of the roadway to resist deformation and damage has been enhanced. The average convergence values of the sur⁃ rounding rocks on both sides of the 182605 lower material transportation roadway gob-side entry retaining have decreased to 227.8 mm，and the average approach of the top and bottom plates has decreased to 274 mm. This effectively maintains the stability gob-side entry retaining and ensures the ventilation，transporta⁃ tion and pedestrian safety of the roadway. The research proposed the power-off backwashing technology for grouting of high-water materials，effectively solving the problem of the grouting material solidifying and blocking the pipeline due to sudden power failure，improving work efficiency，and saving about 140 000 yu⁃ an in material costs. The implementation of high-water filling gob-side entry retaining in the 182605 lower material transportation roadway has reduced the tunneling volume，increased the recovery of coal resources by 25 000 t，and created an economic benefit of 50 million yuan. The application of high-water material gob-side entry retaining technology in the middle roadway between the 182605 lower and 182605 working face has achieved "Y" -shaped ventilation in the working face，improving the working environment for work⁃ers，realizing coal pill-free mining，alleviating the tense situation of mining and excavation succession， eliminating the waste of coal resources，which has important application value for the sustainable develop⁃ ment of coal mines，and provides a reference for the development and promotion and application of high wa⁃ ter filling gob-side entry retaining technology.
    Research on Optimization of the Structural Parameters of the Pillar Recovery Quarry in the 3# Ramp Channel of the Southeast Ore Body
    TIAN Wendong ZHANG Yuantao ZHAO Xingkuan SHI Daqing WANG Shaoyong WANG Zhenqi
    2025, 41(06):  73-80，85. 
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    In order to optimize the structural parameters of the stope for ore body ramp pillar recovery and improve mine safety. The study focuses on the 3# ramp pillar of the Southeast ore body and proposes a mining scheme combining pre-controlled downward medium-deep hole open stopping with delayed filling and layered drift filling methods. Given the ore body’s large burial depth，frequent ground pressure activi⁃ ties，complex pillar recovery conditions，and high mining difficulty，geological surveys，rock mechanics tests，rock mass quality classification，and stability evaluation were conducted. Combined with numerical simulation，the stability of the surrounding rock in the stope is analyzed to determine reasonable stope struc⁃ tural parameters and mining processes，ensuring safe and efficient pillar extraction and stable production of the Southeast ore body. The results indicate that when the stope span is 9.0 m for the pre-controlled down⁃ ward medium-deep hole open stoping method and 10.0 m for the layered drift filling method to ensure rock stability. The stope's production capacity is about 274 t/d，with a dilution rate of 7.5%，a recovery rate of 91%，and a stripping ratio of about 89 m³/kt. This scheme offers practical application and reference value for the recovery of deep-buried，complex pillars affected by frequent ground pressure activity，providing techni⁃ cal guidance for similar mining projects.
    Practice of Isolation Grouting and Filling Mining Technology for 182211 Blocks in Wutongzhuang Mine
    ZHU Junbo
    2025, 41(06):  81-85. 
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    Due to the impact of mining pressure on a large number of residential buildings in the 182211 section of Wutongzhuang Mine，after the underground coal is mined，it will form a mined-out area， which is extremely likely to cause land subsidence，and has a great impact on the safe mining of the mine un⁃ derground，the production and life of residents around the mining area，and the protection of the surface en⁃ vironment. To control surface subsidence，alleviate the conflict between industry and agriculture，and curb the degradation of the surrounding ecological environment，Wutongzhuang Mine successfully mined the 182211 and 182211N working faces by adopting the isolation grouting filling technology. The maximum sur⁃ face subsidence was reduced from 2.3 m to 302.4 mm，which was much lower than that of the traditional methods. This technology not only effectively controlled surface subsidence，but also created economic bene⁃ fits of 892.84 million yuan，alleviated the mining pressure，and laid a solid foundation for the long-term high-quality development of the mine.
    Application of Hydraulic Cavitation Transparency Enhancement Technology in Gas Extraction of 3101 Working Face
    CHANG Wu
    2025, 41(06):  86-89. 
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    During the process of mining through the fault group at the 3101 working face of Kexing Pingquan Coal Industry Co.Ltd.，local gas over-limit phenomena occurred. When traditional borehole gas drainage was adopted，technical problems such as a large number of boreholes，severe hole collapse，and poor gas drainage effect emerged. Through technical research，the gas drainage technology of the working face is optimized and designed，and the hydraulic cavitation enhancement technology is adopted. From the perspective of the actual application effect on site，the engineering volume of drilling construction in the working face has decreased by 1 200 m，the construction cost has decreased by 276 000 yuan，the average gas extraction concentration has increased to 85.7%，the average gas extraction purity has increased to 0.177 5 m3 /min，the drilling hole formation rate has increased to 94.8%，and the gas extraction radius has expanded to 5 m. Very good improvement effects have been achieved.
    Design and Analysis of Gas Extraction Holes Spacing in Underground Coal Mines
    SUN Yongjie
    2025, 41(06):  90-93，98. 
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    To solve the problems such as the blind arrangement of borehole spacing based on experi⁃ ence during the gas drainage along the coal seam in the underground mine of Lu 'an Chemical No.5 Mine， which affects the gas drainage effect，combined with the actual situation of the 10111 transportation roadway underground in the mine，a gas drainage model was established，and the variation of gas pressure under dif⁃ ferent hole spacing distributions was analyzed. The influence of the superimposed effect of porous extraction was verified. Through the research on the pressure distribution under the same spacing and the superim⁃ posed influence of extraction under different spacings，the correlation between the hole spacing that meets the practical application and the extraction radius of a single hole was determined for the first time，laying the foundation for the scientific and reasonable design of underground gas extraction parameters. Practical applications show that the larger the borehole spacing，the smaller the superimposed influence of extraction at different boreholes. Taking the 10111 transportation roadway as the engineering verification object，it is determined that the design is carried out according to the 120 d pre-extraction period. The effective extrac⁃ tion radius of the boreholes is 2 200 mm，and the optimal layout spacing of the boreholes is 6 000 mm. The accuracy of the relationship between the borehole spacing and the extraction radius of a single hole was veri⁃ fied，laying a foundation for improving the effect of underground gas control and enhancing the safety of un⁃ derground operations.
    Application of Combined Anti-seepage Technology of High-pressure Jet Grouting and Curtain Grouting in the Anti-seepage Project of Acid Reservoirs in Mines
    TANG Kai, , REN Fei ZHANG Feng
    2025, 41(06):  94-98. 
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    The anti-seepage of dam bodies has always been a key aspect in the design and construc⁃ tion of water conservancy projects. In the 1960s and 1970s，acidic reservoirs built in China generally adopted earth dams or crushed stone earth dams. Due to the limitations of technology and construction conditions at that time，anti-seepage geotextile membranes were not laid in the dam bodies and reservoir areas，and the quality of foundation treatment and filling of the dam bodies also did not meet the requirements，resulting in the dam bodies and dam foundations being prone to acidic water seepage. This has led to environmental pro⁃ tection incidents and safety accidents.The problem of dam leakage has gradually become an important issue affecting the economy，environment and people's livelihood around the acid reservoir area. This study takes the anti-seepage treatment project of an acidic reservoir in a certain mine as an example. Through engineer⁃ ing and hydrogeological investigation of the acid reservoir，the leakage conditions of the dam body，dam foun⁃ dation and dam shoulder of the acid reservoir were clarified，the leakage channels of the acid reservoir were mastered，and various anti-seepage treatment methods were compared and analyzed. Finally，the combined anti-seepage treatment scheme of high-pressure jet grouting and curtain grouting was determined. The dam body adopts high-pressure jet grouting. The dam foundation adopts curtain grouting，and the two form a full-section anti-seepage. The specific construction parameters of the anti-seepage treatment scheme are also pro⁃ posed. Through the inspection of the anti-seepage effect of the acid reservoir dam body and dam foundation after treatment，it can be known that the plan has achieved a good anti-seepage effect. This kind of technolo⁃ gy has certain reference value in the anti-seepage treatment of similar acid reservoirs.
    Optimization of Mining and Release Ratio of Safe Recovery of 1303 Working Face
    MIAO Xianhua
    2025, 41(06):  99-102，108. 
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    The mining and release ratio is a key parameter of the comprehensive mining face in coal mines，which has a significant impact on the degree of crushing of top coal and is directly related to the ef⁃ ficient mining back of the face. Taking 1303 working face of No.3 coal seam in Zhaoxian coal mine as the research object，the supporting pressure in front of the coal wall was analyzed. Combining the field practice and numerical simulation method，the distribution of support pressure，damage range and coal wall stabili⁃ ty state of the top coal under different mining and release ratios were analyzed. The results show that: when the mining and release ratio is less than 1∶3，the peak vertical stresses in the top and bottom plates are 22.5，24 and 26 MPa respectively，and the overrun distance is about 100 m. After the mining and release ratio is more than 1∶3，the peak stresses in the top plate are increased by 2.5 MPa，and the peak stresses in the bottom plate and the inner coal seam are decreased by 1.52 and 2 MPa respectively，and the overrun distance is increased to 120 m. The mining and release ratio is more than 1∶3，and the peak stresses in the top plate and the inner coal seam are decreased by 1.52 and 2 MPa respectively. Under the working condi⁃ tion of mining and release ratio more than 1∶3，the 1303 working face can realize safe and efficient min⁃ ing，but it is necessary to control the upper limit of mining and release ratio to 1∶4.42 to balance the effi⁃ ciency and safety risk.
    Research on Influence of Internal Waste Dump Stacking Based on Dynamic Response on the Stability of Open Slopes
    LIU Ping YANG Jianguang, DONG Shaobin PANG Jiantao, LI Shujian LYU Yazhou YUAN Mingli, WANG Zhineng
    2025, 41(06):  103-108. 
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    The stability of open-pit mine waste dump is significantly affected by blasting dynamic load in mining. In order to study the influence of inner dump stacking on the dynamic stability of adjacent open-pit slope under blasting vibration，taking Jianshan Phosphate Mine as the engineering background， FLAC3D numerical simulation method was used，the response characteristics of acceleration，displacement and shear strain of the slope before and after the stacking of the inner dump under the action of blasting seismic wave are compared and analyzed. The results show that the internal dump dump can significantly reduce the dynamic response of the slope，and the peak acceleration（PGA）amplification factor at the top of the slope is reduced by 25%（from 2.0 to 1.5），the peak displacement of the slope is significantly re⁃ duced from 50.87 mm to 4.764 mm，the peak shear strain increment is reduced from 0.009 9 to 0.000 8， and the anti-deformation ability is significantly enhanced，from the circular slip surface before stacking to the discontinuous and localized shear zone after stacking. It is concluded that the stacking of the inner dump can effectively improve the dynamic stability of the slope by changing the geometric shape and wave impedance distribution of the slope，absorbing and dissipating seismic wave energy，provide backpressure support，and provide a scientific basis for the safety design of mine dump and the slope treatment under the influence of blasting.
    Construction Process and Support Technology of System Roadway under Complex Conditions in Nanhe Coal Industry Company
    HE Zhiwei
    2025, 41(06):  109-112. 
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    In response to the technical challenges such as the complex construction conditions，high construction difficulty and low efficiency of the 15112 transportation channelway system roadway of Nanhe Coal Industry Company，a comparative analysis of the construction techniques of the system roadway through technical research was carried out. The close-range coal seam penetration construction technology was adopted，and the artificial false roof support technology was used for the roof of the penetration section. For the triangular coal pillars in the reverse excavation section，the anchor cable suspension shed + flexible formwork pouring support technology was used. Judging from the actual application effect on site，the con⁃ struction technology was optimized，the excavation process was simplified，the number of tunnel penetration times was reduced，and the system tunnel excavation cycle was shortened by 8 d. After the combined sup⁃ port was adopted，the stability of the surrounding rock in the special area was controlled，and remarkable application results were achieved.
    Numerical Simulation Research on Optimization of Rock Collapse Step Distance of Sublevel Caving Method without Sill Pillar in Chengchao Iron Mine
    LI Jimin REN Yi HAN Yamin LU Jun FENG Jun WANG Ping
    2025, 41(06):  113-117. 
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    Aiming at the production technical problems such as ore body scale reduction，low ore re⁃ covery rate and high waste rock mixture rate existing in the transition stage (-430~ -570 m) from the Ⅲ# main ore body to the Ⅵ# ore body of Chengchao Iron Mine，the step distance optimization research of the sublevel caving method without sill pillar of the ore body in the transition section of Chengchao Iron mine was carried out. A two-dimensional ore discharge model was constructed by using the discrete element nu⁃ merical simulation platform. Five ore-breaking step distance schemes ranging from 3.2 m to 4.8 m were set up and a comparative analysis was conducted to systematically study the influence law of the stope structure parameters on the ore-discharging indicators. Based on the Bergmark-Roos drawing theory，the theoretical value range of the ore collapse step distance was initially determined，and then the PFC2D numerical simula⁃ tion software was used for optimization and verification. The research results show that the step distance val⁃ ue determined based on the Bergmark-Roos drawing theory is 4~4.4 m. The numerical simulation results show that as the step distance of ore collapse increases，the recovery of ore first increases and then decreas⁃ es，and the mixture of waste rock first decreases and then increases. The 4.4 m mine collapse step distance can achieve the collaborative optimization of mining parameters. The ore recovery rate can reach 85.95%， and the waste rock mixing rate is 15.53%. The research results provide guidance for the optimization of the stope structure parameters in the transition section of Chengchao Iron Mine.
    Research on Stress Distribution Characteristics and Fracture Development Law of Coal Seam Group Mining in Qidong Coal Mine
    ZENG Wei SUN Zhenping,
    2025, 41(06):  118-122. 
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    To solve the problem of the channel for the release of pressure relief gas from adjacent lay⁃ ers to the coal seam in Qidong Coal Mine，this study takes the 8235 working face as the research object，and uses UDEC7.0 numerical simulation software to establish a numerical model for coal seam group mining. The stress distribution characteristics of adjacent layers and the dynamic evolution law of fracture field dur⁃ ing the mining process are systematically analyzed. Based on the directional interception drilling and extrac⁃ tion data of the on-site floor，the spatiotemporal evolution mechanism of stress zoning in coal seam group mining was revealed. Research has shown that horizontally，within a range of 30 m in front of the working face，there is a stress rise zone (with a peak value of 60 MPa)，and beyond 30 m，there is an original stress zone (about 35 MPa)；Within 50 m behind the working face is the pressure relief zone (where the stress drops to 1.5 MPa)，and beyond 50 m is the stress recovery zone (where it rises to 25~30 MPa). Vertically，the depth of mining damage gradually expands with the advancement of the working face，and the depth of over⁃ lying rock damage can reach No.9 coal seam floor (vertical depth of about 21 m). The pressure relief range covers the fine sandstone layers in coal seams No.82~No.9. The evolution of the fracture field exhibits a stage characteristic of "opening first and then closing"，and the fracture density in the depressurization zone is sig⁃nificantly correlated with the gas extraction efficiency. The research results have verified the rationality of the directional interception drilling arrangement in the pressure relief zone，providing a theoretical basis for the coordinated mining of coal seams and comprehensive gas control. It has important practical value in re⁃ ducing the risk of coal mine gas outburst and improving the extraction efficiency.
    Design and Application of Comprehensive Dust Removal Device for Lane 5314 in Tongxin Mine
    XU Dong
    2025, 41(06):  123-126. 
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    In view of the large amount of dust in the Lane 5314 of Tongxin Mine during the excavation period，which caused low visibility in the roadway and severe mechanical wear to seriously threatening the health of the workers，through technical research，the problems existing in the original dust removal device of the roadway were analyzed. According to the current excavation situation，a comprehensive dust removal device such as "spiral foam spray device + recyclable spray water curtain" was designed. From the perspec⁃ tive of the actual application effect on site，after the Lane 5314 adopted the comprehensive dust removal de⁃ vice，the average dust concentration at the working face was controlled below 42 mg/m3 ，the dust concentra⁃ tion in the roadway was controlled below 37 mg/m3 ，and the visibility in the roadway was increased to 85 m， achieving remarkable application results.
    Research and Application on Energy Saving Technology for Comprehensive Utilization of Natural Wind Pressure in Ekou Iron Mine
    WU Hongbin JU Weiwei
    2025, 41(06):  127-130. 
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    Aiming to explore the energy-saving potential of mine ventilation under the synergistic ef⁃ fect of natural wind pressure and frequency conversion technology，this study takes the ventilation system of the southwest south wing mining area of Ekou Iron Mine as the research object，In response to the significant height difference (324 m difference between the intake and return air shafts) and the prominent impact of nat⁃ ural wind pressure in the mining area，the focus is on researching and solving how to achieve energy-saving and emission reduction effects by optimizing fan operating parameters while ensuring a design air volume of 108.32 m3 /s. Firstly，a multi parameter coupling calculation model of natural wind pressure frequency speed air volume is established to quantitatively analyze the compensation effect of favorable wind pressure on the ventilation system in winter. Secondly，multi turbine station frequency conversion control technology is ap⁃ plied to dynamically adjust the operating frequency of the fans to match the natural wind pressure fluctua⁃ tions，and at the same time，parallel wind pressure balancing technology is introduced to solve the pressure imbalance problem when multiple fans operate in coordination. By real-time monitoring of key parameters such as wind pressure and air volume in the ventilation system，a closed-loop optimization system of natural wind pressure +intelligent regulation is constructed. Under the condition of maintaining a constant total air volume，the use of natural wind pressure in winter can reduce the operating frequency of the main fan by 4 Hz. Through actual data verification，this scheme can save ventilation costs of 200 100 yuan/month by con⁃tinuous operation in winter. Practice has proved that there is significant energy-saving space for natural wind pressure in high drop mine ventilation systems. Through the coordinated optimization of frequency conver⁃ sion technology and natural wind pressure，the dual goal of ensuring air supply and reducing energy con⁃ sumption can be achieved，which provides a replicable technical route and detailed data support for the green and low-carbon transformation of mine ventilation systems.
    Experimental Study on Re-beneficiation of a Tailings for Recovery of Fine-grained Lepidolite in Jiangxi Province
    CHEN Laibao
    2025, 41(06):  131-135，139. 
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    Taking the lithium-containing tailings of a concentrator in Jiangxi Province as the object, the flotation process optimization test was systematically carried out to solve the problem of fine-grained lith⁃ ium mica recovery. The process mineralogy analysis shows that the content of Li2O in the tailings is 0.30%, and the lepidolite is mostly in the form of intergrowth in the coarse fraction. It is necessary to improve the dis⁃ sociation degree of lepidolite monomer by grinding. Under the condition of grinding fineness of -0.074 mm accounting for 85%, after desliming by cyclone, hydrochloric acid and sodium hydroxide were used as pH regulators, sodium silicate was used as inhibitor, and dodecylamine/sodium dodecyl benzene sulfonate was used as combined collector. After one roughing, four cleanings and three scavenging, lepidolite flotation con⁃ centrate with Li2O content of 1.98% and Li2O recovery of 67.12% was obtained. The electrokinetic potential test showed that the anionic collector could be adsorbed between the dodecylamine cations by electrostatic force, and the hydrophobic association between the carbon chains further stabilized the adsorption of the an⁃ ionic collector on the surface of lepidolite. Because the neutralization efficiency of sodium dodecyl benzene sulfonate on the cationic charge of dodecylamine is better than that of sodium oleate, the Li2O grade and re⁃ covery of flotation concentrate are higher under the action of dodecylamine/ sodium dodecyl benzene sulfo⁃ nate.
    Research on the Intelligent Pre-selection Technology of Dual-energy XRT for Sorting Spodumene in Xinjiang
    MA Jiachuan LIU Jie , YU Tianyou ZHU Yimin
    2025, 41(06):  136-139. 
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    In order to improve the separation efficiency of pegmatite spodumene with Li2O grade of 1.52% in Xinjiang，a new dual-energy XRT intelligent pre-concentration machine was used for pre-concen⁃ tration test. The results show that under the conditions of feeding size 20~40 mm，feeding speed 60 kg/h，ex⁃ citation voltage 155 kV，excitation current 2 mA，after the intelligent picking experiment，the good indexes of Li2O grade of 1.96% and recovery rate of 95.70% can be obtained. This study shows that the dual-energy XRT intelligent picking technology can improve the efficiency of resource utilization，reduce the emission of wastes，and reduce the impact on the environment.
    Experimental Research on Ultra-pure Iron Concentrate Preparation of an Iron Ore Concentrate
    CHEN Zhou, YUAN Qidong HONG Zhisong ZHANG Jianglong
    2025, 41(06):  140-143. 
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    In order to investigate the feasibility of processing super iron concentrate by ordinary iron concentrate with total iron grade of 68.60% and SiO2 content of 4.45% produced by a mine，the beneficia⁃ tion test was carried out. The results show that the super iron concentrate with yield of 41.65%，total iron grade of 72.20%，total iron recovery of 43.90% and SiO2 content of 0.093%，and the high quality iron con⁃ centrate with yield of 53.28%，total iron grade of 71.31%，iron recovery of 55.47% and SiO2 content of 0.793% can be obtained by grinding-low intensity magnetic separation-demagnetization-elution-demagne⁃ tization-reverse flotation process. The research results provide a reference for subsequent research and de⁃ sign.
    Industrial Application of New Agents for Low-alkalinity Copper-sulfur Separation
    QIU Shicheng
    2025, 41(06):  144-147,151. 
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    In view of the high cost of flotation reagents in the low alkalinity copper-sulfur separation process of Wushan Copper Mine，a new inhibitor JD-1 and collector JY-1 were developed，and their ap⁃ plication effects were verified by laboratory tests and industrial tests. The results showed that the copper re⁃ covery rate increased by 0.35 percentage points in the roughing stage，and the copper recovery rate in the closed-circuit test increased from 90.93% to 92.33% in laboratory test. In the industrial test，under the condition of copper concentrate grade of 24.38%，the copper recovery rate of the new reagent combination （JD-1 dosage of 119.4 g/t，JY-1 dosage of 36.7 g/t）reached 90.38 %，which was 0.17 percentage points high⁃ er than that of the original reagent，and the sulfur recovery rate was increased by 0.35 percentage points. At the same time，the cost of beneficiation reagent was reduced by 20.24%（from 2.184 yuan/t to 1.742 yuan/t）. JD-1 and JY-1 can achieve efficient separation of copper and sulfur under low alkalinity conditions，which are both economical and environmentally friendly，and provide technical reference for similar mines.
    Experimental Study on Flotation Recovery of Mica from an Iron Tailings
    ZHAO Wenpo WANG Xiang
    2025, 41(06):  148-151. 
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    The content of mica in an iron tailing is 15.50%，and the grade of K2O is 1.51%. The exper⁃ imental study on the recovery of mica is carried out by flotation process. The results show that using NaOH as pH regulator，sodium hexametaphosphate as the inhibitor，and CYF-25 as the collector，mica concen⁃ trate with a K2O grade of 8.74% and recovery rate of 57.39% can be obtained by a closed-circuit flotation process of one roughing，three cleaning and one scavenging，which better realizes the recovery of mica com⁃ ponents in the tailings. The results can provide references for the recovery of tailings of same type.
    Experimental Study on Mixed Separation of a Zinc-Molybdenum Ore in Hebei
    ZHOU Wanfu
    2025, 41(06):  152-154，159. 
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    The contents of zinc and molybdenum in a zinc-molybdenum ore dressing plant in Hebei Province are 0.85% and 0.12%，respectively. In view of the low recovery index of molybdenum and zinc in the original on-site process flow，zinc-molybdenum mixed flotation and separation process is proposed to treat the ore. The results show that under the condition of grinding fineness of - 0.074 mm accounting for 65%，with CuSO4 as activator，butyl xanthate and kerosene as collector，via one roughing two scavenging Mo-Zn mixed flotation，first stage concentrate was reground to - 0.043 mm accounting for 82%. After two stages of blank cleaning，the concentrate is treated with CuSO4 as activator，ZnSO4 + Na2SO3 as inhibitor and sodium silicate as dispersant. After one roughing，five cleaning and one scavenging cleaning separa⁃ tion，the molybdenum concentrate with molybdenum grade of 38.65% and recovery of 75.05% is finally ob⁃ tained. The zinc grade of zinc concentrate is 45.68% and the recovery rate is 73.09%. The zinc-molybdenum mixed flotation and separation process significantly improves the metal recovery rate and concentrate quali⁃ ty，which can provide a reference for the separation of similar ores.
    Experimental Study on the Comprehensive Recovery of a Low-grade Lithium-Tantalum-Niobium Ore from Jiangxi
    HU Qinghua FANG Xin HUANG Zhuli FENG Xuan YANG Tianhe
    2025, 41(06):  155-159. 
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    In order to recover iron-lithium mica and tantalum-niobium iron ore from a lithium-tanta⁃ lum-niobium polymetallic ore with Li2O grade of 0.31%, Ta2O5 grade of 0.01% and Nb2O5 grade of 0.02% in Jiangxi Province, the beneficiation process test was carried out. Firstly, the optimum process parameters of magnetic separation and flotation were determined by condition test. Then, the test results of magnetic sepa⁃ ration-flotation-gravity separation and magnetic separation-gravity separation-flotation process were com⁃ pared. The best principle process was magnetic separation to remove non-magnetic minerals-flotation recov⁃ ery of lithium-gravity separation to recover tantalum and niobium. The lepidolite concentrate with Li2O grade of 2.32% and recovery of 84.44%, and tantalum and niobium concentrate with Ta2O5 grade of 3.59%, Ta2O5 recovery of 37.03%, Nb2O5 grade of 8.42% and Nb2O5 recovery of 52.12% were obtained, which real⁃ ized the comprehensive recovery of lithium, tantalum and niobium.
    Purification Experiment of a Quartz Ore in Inner Mongolia
    LYU Xiaoyan DUAN Jinwen GUO Jianghong MA Yongyue
    2025, 41(06):  160-163，167. 
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    In order to make efficient use of a quartz ore in Inner Mongolia，the key technical parame⁃ ters of separation were determined on the basis of the study of ore properties，aiming at the problems of many impurity minerals and difficult separation of aluminum and silicon in the quartz ore. Quartz concen⁃ trates with SiO2 grade of 99.29%，Al content of 0.25%，Fe content of 0.03%，Ba content of 0.06%，Ti content of 0.02%，K content of 0.13% and S content of 0.02% can be obtained by desliming-magnetic sep⁃ aration-flotation physical purification process. Quartz concentrate was purified by chemical purification pro⁃ cess. With the hydrochloric acid concentration of 30%, hydrofluoric acid concentration of 30%, mixed re⁃ agent ratio of water, hydrochloric acid and hydrofluoric acid is 5∶3∶2, slurry solid ratio of 3 mL/g, stirring intensity of 200 r/min, leaching temperature of 90 °C and leaching time of 2 h, high purity quartz sand con⁃ centrate with SiO2 grade of 99.923 7% and total impurity elements of 763 μg/g can be obtained. The highly effective utilization of quartz ore is realized.
    Experimental Research on Iron Removal and Titanium Reduction of Vanadium-Titanium Magnetite Concentrate in Chengde
    WU Chuntao HAN Ming ZHAO Libing ZHAO Liucheng WANG Jianhua ZHU Ziming
    2025, 41(06):  164-167. 
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    The iron concentrate of a vanadium-titanium magnetite contains 59% - 60% iron and about 8% titanium. The iron grade is relatively low and the titanium content is relatively high. The results of particle size analysis show that the finer the particle size，the higher the iron grade. In order to improve the iron grade of iron concentrate and reduce the titanium content，the gravity separation was first used for the exploration test. The results showed that the grade increase of iron concentrate was low，and the effect of titanium reduction by gravity separation test was not good. After that，grinding-magnetic re-separation test were used，when the grinding fineness is controlled at -0.074 mm 91.90%，an iron concentrate with iron grade of 61.11% and titanium grade of 7.05% can be obtained. It shows that grinding can improve the effect of iron increasing and titanium reduction，but it does not achieve the initial target. After grinding and elutriation conditions test，when the grinding fineness is controlled at -0.074 mm 85%，a better index of iron grade of 63.16% and titanium grade of 6.50% can be obtained. It shows that the elutriation machine has certain advantages on iron increasing and titanium reducing in the iron concentrate of vanadium-titani⁃ um magnetite.
    Experimental Study on High-Efficiency Beneficiation of Magnetite-Hematite Ore in a Concentrator in Anshan
    ZHANG Xingyi TANG Hao LI Gang LONG Feifei GU Ancheng NIU Zhanliang
    2025, 41(06):  168-171，176. 
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    Aiming at the problem of deteriorating ore characteristics of a concentrator in Anshan， based on the analysis of ore properties，the optimization test of beneficiation process flow was carried out. The results show that the iron grade of the ore is 28.11%. After crushing by high pressure grinding roll， the crushed product is subjected to wet combined pre-concentration process. With the magnetic induction intensity of low intensity magnetic separation is 250 mT，and the magnetic induction intensity of high in⁃ tensity magnetic separation is 1 000 mT，the pre-concentration concentrates with iron grade of 34.04% can be obtained，and the amount of primary grinding is reduced by 21.76%. At the same time，the iron grade of abandoned coarse tailings is 6.79%. The pre-selected concentrate was subjected to a combined process of grinding-magnetic separation-coarse and fine classification-gravity separation-flotation，a high�quality concentrate product with iron grade of 67.83% and metal recovery of 74.35% was obtained，and the comprehensive tailings grade was 10.42%.
    Research and Practice on Process Optimization of a Copper Sulfide Ore from Gejiu
    YAO Le YUAN Qiang LI Mimi YANG Kang XIE Yuandong ZHOU Yongcheng
    2025, 41(06):  172-176. 
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    There are some problems in the preferential flotation of copper sulfide copper ore in Gejiu， such as low dissociation degree of copper mineral monomer，large amount of sequential return circulation， and difficulty in improving the separation index. The regrinding and reconcentration test of medium ore was carried out，and the optimum process parameters were determined. The industrial practice shows that the closed-circuit process of one roughing-one cleaning-two scavenging，two-stage scavenging concentrate re⁃ turning to one scavenging，cleaning tailings and one scavenging concentrate merging，regrinding and recon⁃ centration is adopted. For the feed ore with copper grade of 1.586%，a copper concentrate with grade and re⁃ covery of 22.17% and 93.32% is obtained，which is 2.52 and 3.37 percentage points higher than the copper grade and recovery obtained by the original process. After the process optimization，the problems of deterio⁃ ration cycle and low separation index of medium ore sequence return are solved，and the resource utilization rate is improved. It can create direct economic benefits of about 986 million yuan per year.
    Study on Process Mineralogy of a Siliceous Rock-type Fluorite Ore in Zhejiang
    NA Yu LIU Yumo LI Zhao HUANG Junwei WANG Enlei CHEN Min DAI Shujuan LI Pengcheng
    2025, 41(06):  177-180. 
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    In order to improve the separation and recovery of a certain siliceous rock-type fluorite ore in Zhejiang，process mineralogical characteristics，including minerals composition，structure and texture， as well as embedding characteristics of main minerals were systematically analyzed using scanning electron microscope (SEM)，advanced mineral identification and characterization system (AMICS)，and chemical analysis. The results show that the main valuable mineral is fluorite with an average grade of 36.67%，while the gangue minerals are mainly quartz with grade of 61.33%. Minor gangues such as barite and calcite are present in negligible amounts，with no detectable crystalline phases，confirming its typical siliceous rock�type fluorite ore characteristics. The ore exhibits massive and disseminated structures，with main textures in⁃ cluding anhedral granular and interwoven textures. Fluorite mainly occurs as irregular granular aggregates， closely associated with quartz in fine-grained dissemination. After coarse grinding，the monomer dissocia⁃ tion degree between fluorite and quartz is extremely low，with most existing as rich associated bodies，which negatively impacts the quality of fluorite concentrate. Therefore，special attention should be paid to the re⁃ grinding and re-separation process of rough concentrates to improve separation efficiency.
    Research on Local Deformation Law of Coal Disturbed by Opening under Increasing Load
    ZHAO Yang LI Jinyu
    2025, 41(06):  181-186. 
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    To explore the stress-strain evolution law and failure mechanism of coal and rock samples with central holes under the real mining effect，taking the coal and rock samples with central holes as the re⁃ search object，the macroscopic failure forms were experimentally studied by using the self-developed unidi⁃ rectional constraint incremental loading device for standard square coal and rock samples，the stress-strain monitoring system and the image capture system. The results show that during the elastic deformation stage， under the action of cascade increasing loads，the stress-strain during the elastic deformation stage of the open-hole disturbed coal and rock mass and the local crack evolution during the failure stage present a stress concentration phenomenon. The larger the diameter of the borehole，the more significant the stress concentration phenomenon. The strain at each monitoring point around the borehole shows a certain anisotro⁃ py，that is，the compressive strain at the vertical and horizontal edges of the borehole is relatively large. Strain in the same direction as the loading has an obvious edge effect at the loading surface，but the exis⁃ tence of horizontal binding force will weaken this effect. The horizontal binding force will enhance the overall and local failure strength of the specimen to a certain extent，but it will not affect the strain value when local failure occurs in the specimen. The increase in the diameter of the borehole intensifies the stress concentra⁃ tion effect，while the horizontal binding force can optimize the bearing capacity of the coal and rock mass and suppress the uneven distribution of tensile strain.
    Research on Mechanical Mechanism and Numerical Simulation and Application of Double Hollow Hole Diamond Straight Cut
    GUO Zhiyu
    2025, 41(06):  187-191，199. 
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    In order to solve the problems of low hole utilization and small circulating penetration rate of deep hole blasting in hard rock roadway，the solution of double hollow hole diamond straight cut is pro⁃ posed. The mechanical model of double hollow hole cut is simplified，assuming that the cut area is only sub⁃ jected to quasi-static expansion of explosive gas，the formation mechanism and mechanical process of dou⁃ ble hollow hole diamond straight cut are analyzed. The LS-DYNA software is used to establish the numerical model of double hollow hole diamond cut，and the effective stress propagation law of double hollow hole un⁃ der multi-stage initiation is simulation analyzed. According to the actual situation，the blasting parameters are selected reasonably to carry out the application test of double hollow hole deep cut in hard rock roadway. The average hole utilization rate reaches 88.0%，the digging depth is increases to 2.76 m，and the explosive consumption reduces to 3.20 kg/m3 . The experiment verifies the high efficiency and adaptability of double hollow hole diamond straight cut in hard rock roadway.
    Research on Degradation Law of Mechanical Properties of Granite-Concrete Composites in Cold Regions
    LONG Yu XIAO Dingjun LI Xiaoshuang HAN Sen PEI Guangzhao JIANG Jiajie ZHANG Miaomiao
    2025, 41(06):  192-199. 
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    In order to explore the freeze-thaw damage law of granite-concrete composite in cold re⁃ gion environment，three kinds of granite-concrete composite with different interface roughness ( 0.61，1.18 and 1.69 mm) were designed. The rapid freeze-thaw machine was used to simulate different cold regions with 0，10，20 and 30 freeze-thaw cycles. The parameters such as appearance morphology change，mass loss，flexural strength loss，crack initiation toughness and fracture energy of granite-concrete composite after freeze-thaw were analyzed. The results show that with the increase of freezing and thawing times，the mass loss rate，longitudinal wave velocity attenuation and mechanical properties loss of the samples all show an increasing trend. After 30 freeze-thaw cycles，the longitudinal wave velocity of the sample with an interface roughness of 0.61 mm decreased by 13.03 %，and the flexural strength and fracture energy loss rates were 73.22 % and 67.67 %，respectively. The longitudinal wave velocity of the sample with the interface roughness of 1.18 mm decreased by 12.59 %，and the flexural strength and fracture energy loss rate were 61.28 % and 69.13 %. The longitudinal wave velocity of the sample with interface roughness of 1.69 mm decreased by 9.67 %，and the loss rates of flexural strength and fracture energy were 39.40 % and 41.97 %，respectively.The crack initiation toughness and damage factor of granite-concrete composite speci⁃ mens were calculated，and the linear fitting expressions of crack initiation toughness and freeze-thaw cycles under the above three interface roughness were obtained，it can provide certain references for related re⁃ search.
    Analysis of Geophysical Characteristics and Prospecting Potential of Bailing Gold Deposit in Anqing City，Anhui Province
    SHEN Yanguang WANG Pengfei
    2025, 41(06):  200-204，210. 
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    Bailing Gold Mine in Anqing City is a small-scale gold deposit with a formation type of hy⁃ drothermal structural fracture filling. In previous geological work，shallow gold veins were basically con⁃ trolled. In order to systematically study the geological conditions of mineralization in the mining area and ex⁃ plore deep ore bodies，this research work combines previous geological and geophysical results，and con⁃ ducts 1∶10 000 high-precision magnetic method area measurement，AMT，and induced polarization depth measurement to delineate favorable geophysical anomalies and analyze the prospecting potential. The re⁃ search results indicate that the fault structures in the area of Bone Mountain，where the C3 magnetic anoma⁃ ly zone is located，are extremely developed and consistent with the IP-1 induced polarization anomaly zone in the plane position. Combined with the results of induced polarization depth measurement，there are low resistance and high polarization anomalies in the deep part，which can be interpreted as mineralized bodies controlled by structural fracture zones. Therefore，the Bone Mountain area is a key target area for searching for hydrothermal structural fracture filled gold deposits. The A30 profile depth measurement conducted on the southwest side of Dongchong Reservoir shows that a complete high amplitude induced polarization anom⁃ aly zone with a certain scale is formed in the depth direction of the apparent polarization rate in the area，in⁃ dicating that the geological bodies causing electrical excitation anomalies have certain continuity and con⁃tent of metal elements. Combined with the mineralization model of surrounding deposits，the contact zone be⁃ tween the deep rock mass and the Yueshan Formation and Nanlinghu Formation in this area is a key target area for searching for skarn type polymetallic deposits. Comprehensive analysis suggests that the Bailing gold deposit has great potential for mineral exploration.
    Geochemical Exploration Anomaly Characteristics and Deep Mineral Exploration Potential in Southwestern Section of Daguan Gold Mine in Qianxinan Autonomous Prefecture
    ZHAO Mingfeng LUO Jianjun
    2025, 41(06):  205-210. 
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    The Daguan Gold Mine in Qianxinan Autonomous Prefecture is located in the east of the Yunnan-Guizhou-Guangxi gold deposit concentration area. It has a very good geological background and conditions for mineralization. However，since its discovery 30 a ago，there have been no major break⁃ throughs in mineral exploration. At present，only one small gold deposit has been newly discovered. Through the analysis and research of the geological data of the mining area and the geochemical data of the soil and rocks in the southwest section，it was found that the previous mineral exploration work mainly focused on the T/P interlayer slip structural zone with the characteristics of Au ore body halo element enrichment on the sur⁃ face，while ignoring the lock mouth rock fault zone with the characteristics of As，Sb and Hg leading edge halo element enrichment on the surface. The study adopted the characteristic of the primary halo zone of the deposit and suggested that there might be an enrichment of halo elements in the Au ore body in the deep part of the Lock Mouth rock fault zone，with great potential for mineral exploration. Through drilling engineering verification，a thick and high-grade concealed gold ore body was discovered deep in the Lock Mouth rock fault zone，achieving a breakthrough in mineral exploration in this area. This makes it have the potential to become a medium to large gold deposit，further indicating the direction of mineral exploration in this area and expanding the resource prospects of this area.
    Research and Design of Intelligent Safety Performance System
    GAO Yinlong YAN Yajun
    2025, 41(06):  211-215. 
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    Now standardized management and control mechanism is lacked in the management and control process of most production managers, it is difficult to construct a quantitative management system, which makes it difficult to accurately measure and effectively control management activities. Based on the in⁃ formation platform, an intelligent safety performance management system is constructed. After the safety per⁃ formance data of the personnel are put into the safety management system, the safety performance technical standard classification, data statistics and analysis can be completed, and a visual and diversified perfor⁃ mance board and performance report are generated. At the same time, the closed-loop management of auto⁃ matic reward and punishment is realized by confirming and submitting the safety performance report. The im⁃ plementation of this system can effectively save management costs, improve the safety responsibility of per⁃ sonnel, and provide basis for the smooth development and construction of safety work.
    Application of Metal Film Filter Bag Dust Collection System in Molybdenum Roasting Industry
    LIU Dongyang
    2025, 41(06):  216-218. 
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    The high-temperature（400-700 ℃），high-dust（20-50 g/Nm³），and high-sulfur（SO₂ concentration exceeding 2 000 mg/Nm³）characteristics of off-gas from molybdenum roasting rotary kilns lead to frequent failures of traditional organic fiber filter bags，significantly hindering the sustainable de⁃ velopment of the industry. Metallic membrane filter bags，with their uniform pore size，high filtration pre⁃ cision，non-shedding properties，resistance to organic solvents，corrosion，and high temperatures，have emerged as a novel solution for off-gas treatment in molybdenum roasting rotary kilns. Industrial cases demonstrate that the application of 304 stainless steel metallic membrane filter bags in molybdenum roast⁃ ing processes enhances operational stability compared to fiber-based alternatives，shortens the molybde⁃ num oxide roasting workflow，and reduces comprehensive operational and maintenance costs，which pro⁃ vides a groundbreaking solution for high-temperature flue gas treatment in the metallurgical industry.
    Quality Evaluation of Imported Coal Based on Principal Component Analysis and BP Neural Network Model
    FU Yao DING Yan WANG Nan XUE WeiFeng
    2025, 41(06):  219-223. 
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    In order to providing a reliable screening method for port supervision departments to quickly identify the quality of unknown imported coal，the construction research of imported coal quality evaluation model was carried out based on BP neural network.The model was based on SPSS principal com⁃ ponent analysis，finding that 8 parameters including low calorific value of received base，high calorific val⁃ ue of received base，high calorific value of dry base，total water，ash of dry base，mercury of dry base，ar⁃ senic of dry base and phosphorus of dry base，can replace the original 15 parameters to evaluate the quali⁃ ty of imported coal. By using the above parameters，59 groups of imported coal samples were randomly se⁃ lected as the training set，and the other 13 groups of samples as the verification set，and the BP neural net⁃ work model of imported coal quality was constructed. The predicted result shows that relative errors be⁃ tween the predicted value of the model and the actual value by test are less than 15%，meaning that the quality of unknown imported coal could be rapidly identified according to the predicted value of the BP neural network model.
    Exploration and Practice of Lean Management in Coal Enterprises
    GE Weiming ZHANG Kun CHENG Kun
    2025, 41(06):  224-228. 
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    Lean management is a management method that develops rapidly，improves efficiency， and penetrates into all levels of the enterprise operation process under the guidance of lean thinking. The shortcomings of cost management，management system and digital level in the process of implementing lean management in coal enterprises was analyzed. Improvement measures from the aspects of implement⁃ ing comprehensive budget，strengthening bidding and procurement，strengthening material plan，strict cost assessment and promoting the integration of industry and finance was put forward. It was pointed out that the key points of implementing lean management in coal enterprises to provide reference for coal enter⁃ prises to enhance their revenue-generating ability and market competitiveness and achieve high-quality de⁃ velopment.
    Application of UAV Oblique Photogrammetry in Ecological Restoration of Open-pit Mines
    SUN Kangping MU Zhe WANG Jizhen
    2025, 41(06):  229-232. 
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    The terrain of open-pit mines is complex，the height difference is significant，and the tradi⁃ tional surveying and mapping method is low in efficiency and insufficient in accuracy，which is difficult to meet the needs of rapid monitoring of geological disasters such as road collapse，restricting the accurate im⁃ plementation of mine ecological restoration. In order to solve this problem，the innovative application of UAV oblique photogrammetry in mine ecological restoration was studied with the objective of monitoring road collapse in open-pit mines，aiming to solve the difficult problems such as low efficiency of surface in⁃ formation acquisition and insufficient accuracy of collapse recognition in complex terrain. By optimizing UAV aerial survey parameters，high-resolution multi-view image data of mining area was collected，radial and tangential distortion correction models were adopted to improve the geometric accuracy of the image， and disturbance such as vegetation and noise was eliminated based on the filtering algorithm of Triangulation Irregular Network (TIN)，and high-precision three-dimensional mine surface model was constructed to real⁃ ize automatic identification and quantitative analysis of subsidence areas. The results show that the plane er⁃ ror and elevation error of the 3D model generated by this method are less than 0.015 m and less than 0.02 m， and the recognition accuracy of collapse boundary is 98.7%. The monitoring results are completely consis⁃ tent with the field survey. Compared with the traditional RTK measurement，the efficiency is increased by more than 5 times，and the small deformation can be captured，which provides an efficient and low-cost technical means for mine geological disaster monitoring，and significantly improves the collapse warning ability. The high-precision three-dimensional model can support the fine design of ecological restoration projects，and the technical process can be extended to other open pit mining areas. The research provides re⁃ liable data support and reference for mine ecological restoration，helps the intelligent transformation of mine environmental governance，and has important engineering application value.
    Influence of Freeze-thaw Cycle on the Strength Change of Tailings Cemented Body
    WANG Xiaoyi CHEN Chao
    2025, 41(06):  233-236. 
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    Taking the tailings of Miaogou Iron Mine as the research object，the strength variation law and damage mechanism of tailings cemented body under different cement-sand ratios（1:6，1:8）and slurry concentrations（75%，78%）were systematically investigated by freeze-thaw cycle test. The results show that with the increase of freeze-thaw cycles，the porosity of tailings cement increases significantly，the loss rate of longitudinal wave velocity increases gradually，and the compressive strength and tensile strength show a significant deterioration trend. Among them，the porosity of the sample with a cement-sand ratio of 1∶6 and a slurry concentration of 75% increased to 19.30% after 30 freeze-thaw cycles，and the wave veloci⁃ ty loss rate reached 65%. The sample with low cement-sand ratio（1∶8）showed better damage resistance， and the sample with high slurry concentration（78%）showed lower strength reduction during freeze-thaw cycles. The research results reveal the damage mechanism of freeze-thaw cycle on the macroscopic mechani⁃ cal properties and microstructure of tailings cemented body，which provides a theoretical basis for the engi⁃ neering application of tailings cemented body in cold environment.
    Optimization Production Practice of Mineral Processing Process for a Lead-Zinc Sulfide Mine in Shaanxi Province
    ZHAO Yanjie WANG Yang WU Wentang WEI Yaru QIN Jing
    2025, 41(06):  237-243. 
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    In order to improve the production capacity，improve the beneficiation index，and reduce the beneficiation cost，the whole process of crushing，ball milling，flotation，dewatering and the technical parameters of the Shaanxi Dongtangzi Lead-Zinc Mine have been optimized. The crushing operation was modified by increasing the pre-screening and changing the vibrating screen mesh to stainless steel wire， which reduced the particle size of the crushing from 21 mm to 14 mm and increased the crushing ratio from 16.67 to 25. The ball milling operation explored the optimal steel ball filling rate of 42.39%，the steel con⁃ sumption of 0.58 kg/t and formulated the optimal steel ball addition system，the processing capacity of the ball mill has been increased from 1 000 t/d to 1 100 t/d. The flotation process was modified by applying the potential control flotation technology. After applying the MB collector，Z-1 flotation agent and BK20 as frother and optimizing the flotation reagent system，the process was changed to single series operation under the condition of keeping the production capacity unchanged，and the metal recovery rates of lead，zinc and silver were increased by 2.55，2.04 and 5.31 percentage points，respectively. The cost of mineral processing has significantly decreased. After the application of ceramic filter machine in dehydration operations，the production efficiency and automation level have been improved，and the moisture content of the lead and zinc concentrate filter cake has decreased to 12% and 9%，respectively. The mine has increased its produc⁃ tion capacity by 10% and the metal recovery rate by 6.385 1 million yuan per year through the optimization of mineral processing process and technical parameters，saving 6.773 4 million yuan per year in production costs，and generating a total economic benefit of 13.158 5 million yuan per year，which is considerable.
    Application of Pneumatic Flow Aid Clearing System in Large Flat-bottomed Powder Ore Bins
    JI Wanjian
    2025, 41(06):  244-248. 
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    Aiming at the problem of arching and blockage caused by fine particle size，high water con⁃ tent and high sulfur content in the large flat-bottomed powder ore bin of Luohe Iron Ore Dressing Plant of Masteel in Anhui Province，a solution of pneumatic assisted flow clearing system is proposed. By analyzing the mechanical properties of the material and the structure of the warehouse，it is found that the increase of the internal friction angle of the material and the chemical reaction of the sulfide are the main reasons for the blockage. The designed pneumatic flow supporting system adopts the instantaneous injection technology of compressed air. Through layered arrangement of nozzles and automatic control，the friction resistance be⁃ tween materials is effectively reduced and the sintering block is destroyed. The practical application shows that the system significantly improves the fluidity of the silo，increases the effective volume utilization rate from 40% to 80%，avoids the safety hazards of manual clearance，and achieves the production goal of high efficiency，safety and environmental protection.
    Experimental Study and Production Practice of Biological Oxidation Liquid Recycling JIANG Zihan YANG Siting HU Shitong
    2025, 41(06):  249-251. 
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    In the process of biological oxidation pretreatment，a large amount of oxidation liquid will be produced. There are a large number of living bacteria，surplus ammonia nitrogen and toxic ions such as arsenic in the oxidation liquid. Living bacteria and surplus ammonia nitrogen are conducive to biological oxi⁃ dation reaction，while excessive toxic ions such as arsenic will inhibit biological oxidation. In order to solve the problem of how to effectively realize the recycling of oxidation liquid. Exploratory innovative experimen⁃ tal research on the recycling of biological oxidation liquid was carried out. The optimum concentration range of arsenic affecting the activity of oxidizing bacteria was determined and successfully applied to production practice. Industrial practice shows that when the concentration of toxic ion arsenic in the oxidation solution is controlled to below 8 542 mg/L，the partial recycling of the oxidation solution to the biological oxidation process not only improves the biological oxidation efficiency，reduces the cost of sewage treatment，but also greatly reduces the total amount of ammonia nitrogen emissions，which has significant economic and envi⁃ ronmental benefits.
    Application of the One-card Automatic Measurement System for Mineral Products
    BIN Yinghui
    2025, 41(06):  252-256. 
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    In order to improve the efficiency and accuracy of measurement management in mining en⁃ terprises，aiming at the shortcomings of traditional manual measurement methods in data processing and re⁃ al-time performance，the mineral product measurement one-card automatic measurement system is carried out. By integrating key technologies such as weighbridge measurement，data acquisition and transmission， storage and statistical analysis，the system realizes the automatic management of the whole process from raw material procurement to finished product sales. The application results show that the system significantly im⁃ proves the measurement efficiency，reduces the human error，and optimizes the production management pro⁃ cess，which provides an effective solution for the intelligent upgrading of mining enterprises.