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Table of Content

    15 August 2014, Volume 30 Issue 08
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    Determination of Reasonable Coal Pillar Width of Island Coal Face in Deep Well Under the Conditions of Mining Dynamic Pressure
    NIE Jian-Wei, WANG Wei, ZHAO Lei, MA Jia-Xing
    2014, 30(08):  1-3. 
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    According to the actual geological conditions of of 1412(1) fully mechanized face of Dingji mine, the control mechanism for surrounding rock deformation of roadway driving along goaf is analyzed in detail, the numerical computation model of reasonable coal pillar of island coal face in deep well under the conditions of mining dynamic pressure is established. The surrounding rock stress distribution of overlaying strata stable stage and dynamic pressure stage, and the plastic zone distribution of coal pillar and roadway surrounding rock with the coal pillar width is 6,8,10 m are discussed. It is concluded that, the minimum values of stress peak and stress concentration factors under the conditions of the coal pillar width is 6 m.
    Analysis on the Safety of Upward Mining in the Type of Roadway Mined-out Area
    MA Shao-Jie
    2014, 30(08):  4-6. 
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    According to the mining situation of 8# coal seam,the stability of coal pillar and the height of the caving zone and fractured zone of the type of roadway mined-out area are analyzed by adopting theoretical analysis method. The anlaysis results show that, although the deformation of the coal pillar of 8# coal seam is large but it will not collapsed integrally, besides that, the 5# coal seam is located in the fracture zone of 8# coal seam. The deformation situation of 8# coal seam roof under different conditions are simulated and calculated by adopting the UDED software, the results show that, the total settlement value of coal seam is small and the tilt is small too. According to the above research results, 5# coal seam of the upper of the type of roadway mined-out area is mined successfully, and it has some guidance role to the similar coal seam working face.
    Research and Practice on the Pillar Recovery Scheme of Xiagao Iron Mine
    SUN Jiang-Xian, WANG Xing, SUN Guo-Quan
    2014, 30(08):  7-10. 
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    The open stope mining method is adopted in Xiagao iron mine, due to the mining method of chambier is not standard, the ore recovery rate is very low and the residual amount of pillars and hanging wall and footwall are large. In order to enhance the ore recovery rate,meet the requirement of mine production, the geological situation and mining status of mining area are analyzed, besides that, the three sections and three steps stoping scheme is determined to recycling the pillars and good application effects are obtained.
    Research on the Open-pit Boundary Optimization of a Lead-Zine Mine of Overseas Based on NPV Scheduler Software
    YANG Qi
    2014, 30(08):  11-12. 
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    The NAP Scheduler software is adopted to optimize the open-pit boundary of a Lead-Zine mine of overseas based on the geological block model. So, the optimized open-pit boundary and stripping schedule of the Lead-Zine mine are obtained. The research results in this paper can provide technical solution and decision-making basis for open-pit mining and investment of mines.
    Research on Reasonable Parameters of Mechanical Loading of Upward Middle-deep Blasting Hole in Meishan Iron Mine
    XU Zhi-Qiang, LI Zheng-Gang, WU Rong-Gao, JIANG Xue, WANG Wen-Feng
    2014, 30(08):  13-14. 
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    A large numer of experimental data is collected to conduct multiple experiments,the experimental results show that, the return fine rate can be reduced by taking the measures of adding diesel into emulsification granular anfo explosives. The good continuity effects of delivering explosives is obtained with the diameter of boreholes of upward middle-deep blasting hole is 91 mm,the back tube speed of explosive loading truck is about 17 cm/s,the static pressure and dynamic pressure of the tank are 0.65~0.7 MPa, 0.45 MPa respectively. The experimental results provide the basic paramters for mechanized loading in mesishan iron mine,besides that, these paremeters can also provide a certain reference to the similar dometic mines.
    Optimization on the Medium-length Hole Blasting Network of Sublevel Open Stoping of Extra-hard Ore-bearing Rocks
    ZHOU Yong
    2014, 30(08):  15-17. 
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    The influence of medium-deep hole blasting underground to the surface building vibrations of Huibaoling iron mine. So, through the theoretical analysis, the existing blasting network is optimized. The research result show that, the blasting vibration and the rate of ore blocks are reduced and the cost of secondary blasting is lowered by the optimized blasting networks, besides that,good economic and social benefits are obtained.
    Application of On-site Mixed Charging Emulsion Explosive in High Effective Smooth Blasting
    GUO Xiong, WANG Yi-Ming, ZHOU Sheng-Ping, LIU Xiao-Hui
    2014, 30(08):  18-21. 
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    According to the actual situation of the poor blasting effects of Qianbixi copper mine, the blasting explosive,blasting construction, the utilization rate of perforation,the shape of roadway are researched. The explosive consumption is reduced to 1.51 kg/m3, the average penetration of shallow hole blasting of working faces is increased from 2.6 m to 3.2 m, the blasting efficiency is increased to 91.4% by adopting the on-sit mixed charging emulsion explosive to conduct high effective smooth blasting. The research results show that, the blasting quality reach to the quality standard, perfect comprehensive benefits is obtained, besides that, the research results in this paper can provide some reference for mine construction.
    Discussion on Blasting Hazards of Development and Construction of Sikeyangshu Mine
    ZHANG Jian, CHEN Yong, WANG Hong-Bo
    2014, 30(08):  22-24. 
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    The influence of blasting vibration to village and villagers in the surface in the process of development and construction of Sikeyangshu mine should be considered. So, the harms of seismic wave is analyzed,the peak particle vibration velocity method is adopted to analyze the influence of mining blasting vibration to village in the surface, the earthquake intensity is used to verify the above analysis results. Besides that, the measures of prevention and control of blasting operation of development and construction are proposed. The research results indicated that, the blasting vibration of development and construction of Sikeyangshu mine is less harmful to village and villagers in the surface, therefore, the mining blasting operation is safe.
    Comprehensive Recovery of Associated Tungsten and Sulfur from a Rough Tin Concentrate
    PING Fu-Xian
    2014, 30(08):  34-36+39. 
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    Distribution characteristic of tungsten and sulfur, phase and liberation of tungsten mineral in rough tin concentrate from Yunxi old plant was studied. The results show that with closed grinding operation, sulfur flotation of one roughing, one cleaning, two scavenging, and tungsten flotation of one roughing, two cleaning, three scavenging process, sulfur concentrate with 35.78% grade and 96.36% recovery, tungsten concentrate with 5.02% WO3 grade and 50.19% recovery, and tin concentrate with 29.28% grade and 96.42% recovery was achieved.
    Application of High Pressure Roller Mill in Metal Mines and the Equipment Selection
    WANG Shi-Biao
    2014, 30(08):  37-39. 
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    Application status of high pressure roller mill in metal mines is analyzed, the selection essentials and methods of high pressure roller mill in metal mine is summarized, the application of high pressure roller mill in metal mine is prospected.
    Beneficiation Tests on a Limonite in Guizhou Province
    HU Wan-Ming, ZHU Ya-Guang, WANG Bing
    2014, 30(08):  40-41+44. 
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    Magnetic roasting, low intensity magnetic separation mineralogical research was conducted in order to find a suitable way to develop and utilize a limonite in Guizhou. The results show that with the 8% dosage of coal powder, roasted at 850 ℃ for 60 min, roasted products grinding at fineness of 75% passing 0.074 mm, with intensity of 151.27 kA/m for low intensity magnetic separation, through one roughing, one cleaning, one scavenging, middles back to the flowsheet in turn process, iron concentrate with iron grade of 61.14%, iron recovery of 89.80% was achieved.
    Beneficiation Tests on a Lead-zinc Ore from Guangdong
    ZHENG Lun, LIU Yun-Cai, WANG Jian-An
    2014, 30(08):  42-44. 
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    A lead-zinc mine in Guangdong province belongs to the implicit crystalline lead-zinc deposit, with high lead oxidation rate, lead and zinc are closely associated with each other. In order to develop and utilize the ore, experimental study was conducted. The results show that with the grinding fineness of 70% passing 200 mesh, using lead and zinc simultaneous flotation of one roughing, one cleaning, one scavenging, and one roughing, two cleaning, one scavenging for zinc beneficiation, middles back to the flowsheet in turn, lead and zinc mixed concentrate with lead grade and recovery of 29.79% and 90.78%, and zinc grade and recovery of 32.43% and 36.60%, zinc concentrate with zinc grade of 56.91%, recovery of 61.41%, total lead and zinc recovery of 90.78% and 98.01% was achieved.
    Ore Quantity Calculation Method Based on 3D Visualization Modeling Technology
    CUI Fang-Ning, SHAO Ming-Guo, ZHAO Ran-Lei, ZHANG He-Guo
    2014, 30(08):  61-63. 
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    Taking the Qiaopuka iron mine of Xinjiang as an example, the 3D visualization technology ore calculation method is researched based on RTK GPS measurement system, MapGIS, AutoCAD and 3DMine software. Firstly, the RTK GPS measurement system is adopted to conduct 3D precision positioning so as to obtain the ore boundaries of mining area. Then, according to the detailed survey of geological data, the orebody 3D model is established by adopting the MapGIS,AutoCAD, 3DMine software to obtain the distribution situation and volume of orebody accurately to calculate the minable quantity. The research results show that, the ore quantity calculation method with the characteristics of high precision, quick and intuitive is superior to the classical methods.
    Trace Elements Geochemical Characteristics of Gold-bearing Sulfides in Manaoke Gold Deposit
    LIAO Hua-Cheng, HUANG Xiao-Dong, ZHANG Cheng-Jiang, SONG Shi-Wei, SONG Hao
    2014, 30(08):  64-67+71. 
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    The main gold-bearing sulfides of Manaoke gold deposit such as pyrite,stibnite,realgar trace elements are researched,according to the research results,the differences of rare earth distribution curve of different mineral are big,the difference of rare earth distribution curve of the same mineral are also different significantly.The values of Hf/Sm,Th/La,Nb/La,Y/Ho,Zr/Hf,Nb/Ta are not identical with each other.According to the predecessors' research results to figure,the differences of Co/Ni values of pyrite samples are obviously.The above research results indicated that,the hydrothermal mineralization period of Manaoke gold deposit has experienced the effects of different nature of the fluid.Besides that,Q cluster and R cluster analysis of the trace elements of gold-bearing sulfides in mining area are conducted,the analysis results show that,part of the ore-forming hydrothermal maybe come from the late magmatic hydrothermal that form the deep concealed rock mass.
    Risk Assessment on the Unstability of the Group of Mined-out Area Based on the Composite Index Classification Method
    ZHAO Ying-Gui, WANG Chun-Ren, YOU Xun, LIU Jin-Long, YU Min
    2014, 30(08):  95-98+101. 
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    In order to ensure the remnant ore resource recycle in the group of mined-out area,the composite index classfication method is adopted to do evalution on the unstability of the group of mined-out area.To be specific,the geological factors,mining technical conditions,the comprehensive factors of remnant ore resource recycle are regarded as the analysis indexs to evaluate the risk degree of unstability of the group of mined -out area before and after recycling the remnant ore resources.The evaluation results in this paper can provide guidance basis for recycling the remnant ore resource,besides that it can be taken as the reference for recycling remnant ore in similar mines.
    Research on Roadway Supporting Technology Based on RFPA2D
    GONG Pei-Nuan, ZHAO Hua
    2014, 30(08):  99-101. 
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    According to the analysis results of the destruction situation of the upper middle roadway of Red Sea mining area, fractures,faults and the complex changes of approach of dynamic and static stress field are the important factors of the middle of roadway roof caving. So, the 180 m middle development roadway is numerical simulated by adopting the RFPA2D software,the roadway destruction mode that is maybe appeared under the conditions of static stress field. To be specific,the stress is concentrated on intersection lines of roadway roof, firstly, the middle of roadway is destructed, then, the fractures extend to the deep, shaft station roof is separated from the upper stable rock formations eventually, then it is caved. Fractures are appeared in the ore drift roof, so, the ore drift roof is unsafe under the dynamic stress field. According to the numerical simulation results, the anchor-plate retaining method is used to deal with shaft station, the single anchor length, every other row of anchorage support method is adopted to deal with ore drift outside dyke, therefore, the stability of development roadway is guaranteed.
    Analysis on the Risk Management of Gas Explosion in Coal MineBased on Fuzzy Comprehensive Evaluation Method
    WANG Zhong-Wei
    2014, 30(08):  102-105+110. 
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    The risk maangement evaluation model of gas explosion is established based on analyzing the hazards that caused gas explosion in coal mine from the four aspects of people, machine,envrionment and management. The analytical hierarchy process method is adopted to obtain the weighted value of all factors and conduct fuzzy compreshensive evaluation on them, besides that, the results of risk management evaluation are quantified, so, the risk levels are obtained. The research results in this paper can provide some refenrence for the risk management work of all kinds of disasters and accidents in coal mine.
    Research on the Technical System for the Prevention and Control of Gas Disasters of Hexi Coal Mine
    HE Chong-Guo, WANG Hai-Feng, WANG Wei
    2014, 30(08):  106-110. 
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    According to the occurence conditions of coal seam gas and geological conditions of Hexi coal mine, the coal seam gas control measures based on mining technology protective layers are taken so as to eliminate the gas outburst danger. In aspect of extraction of borehole layout and extraction forms,the stereoscopic gas extraction modes are formed with combing with the ground drilling extration and downhole drilling extraction, pressure relief extraction and extraction in advance, crossing borehole and bedding borehole, extraction before mining and extraction in the process of mining. Combined with the different ventilation modes of different coal seam working faces, the significant effect of the gas extraction is obtained and the goal of safe and efficient mining of the mine is achieved.
    Research on the Comprehensive Evaluation Index System of Mine Ventilation Based on AHP
    NIE Kai
    2014, 30(08):  111-113+116. 
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    The all factors that affect the mine ventilation system are considerated comprehensively based on the physical composition of ventilation system and the theory of system security.The comprehensive evaluation index sysem of mine ventilation is established that include twenty-five indexs from six aspects of ventilation power,ventilation network,the quality of ventilation,ventilation facitilies,ventilation monitoring and ventilation management.The weighted values of above indexs are obtained by adopting the analytic hierarchy process,besides that,the evaluation model is get to conduct the comprehensive evaluation on the mine ventilation system.
    Research on the Quantitative Risk Assessment Method of Mined-out Area in Underground Metal Mine
    LI Shan-Cun, LIU Xiao-Ming
    2014, 30(08):  114-116. 
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    The risk eassessment syetem of mined-out area hazards is discussed in brief, the contents of risk assessment of mined-out area is divided into risk assessment and vulnerability assessment. The risk of mined-out area is quantitative analyzed by adopting the fuzzy mathematical analysis method. According to the analysis results of damage situation that may be caused by the risk of mined-out area, the grading system of social economic vulnerability degree of mined-out area is build and the risk index of mined-out area hazards is obtained, therefore, the risk assessment framework of mined-out area hazards is established and risk grading of mined-out area hazards is realized successfully.
    Simulation on Ventilation Cooling in High Temperature Deep Well Deposit Based on Ventsim Software
    LI Xin-Cheng, ZHOU Shi-Lin, SU Jian-Jun, XU Hong-Liang
    2014, 30(08):  117-119. 
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    Taking the Nihe iron ore as the research example, the Ventsim 3D ventilation software is adopted to simulation calculation on the temperature distribution situation of mine personnel activities centralized locations. The simulation results show that, the deep well operation temperature from May to October in every year are more than the limit values of some relative regulations. The simulation results of the artificial refrigeration effects show that, most of the deep well temperature can meet the requirements of some relative regulations by taking the artificial refrigeration steps. In order to reduce the production costs, the power refrigeration equipment can also meet the requirements of some relative regulations under the conditions of reducing the power of the refrigeration equipments from September to October.
    Finite Element Analysis on the Static Structural Strength of the Connecting Lever of Boomer 281 Trolley
    LI Hui
    2014, 30(08):  160-163. 
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    The propel compensation connecting level as the key components of the Boomer series driving trolley, the structral strength and fatigue life of the Boomer 281 trolley are infulenced directly by the ones of the propel compensation connecting lever.According to the location and structure of connecting lever, the statics analysis is conducted so as to looking for the danagerous section that located in area of the connecting lever and turn the shaft vertical intersection. The boundary conditions of the connecting lever is discussed based on establishing the 3D model of the connecting lever, besides that, the finite element analysis is adopted to calcuate the stress and strain values of the turn the shaft of connecting lever. The research results in this paper can provide some reference for improving the equipment maintenance maangement level.
    Application of PLC Based on the Automatic Control System of Coal Mine Gas Drainage Machine
    ZHANG Yu-Gang
    2014, 30(08):  164-165+176. 
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    Taking the automatic control system of gas drainage machine of a coal mine as an example, the PLC and configuration software are integrated into the system so as to achieve the purpose of automatic controlling. Firstly, the hardware structure of the system are introduced, then, the influence of drainage negative pressure and CO concentration of pipe to the whole drainage system and the process drainage are analyzed, besides that, the accurate control methods of the two parameters are discussed. The research results show that, the reliability and safety compliance with requirements for practical use.
    Modeling and Manufacturing Scheme of Drive Sprocket Based on Solidworks
    ZHANG Jia-Yuan, ZHAO Hui, HU Chun-Lin
    2014, 30(08):  166-167. 
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    The effect and importance of the drive sprocket in the first convey of cantilever excavator are briefly introduced. Combing with the questions in the process of manufacturing, the Solidworks three-dimensional design analysis software is adopted to analyze the state and stress distribution situation of tooth profile and the meshing process of drive sprocket. Therefore, the new modeling and manufacturing scheme is proposed, and good application effect is obtained.