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Table of Content

    15 January 2013, Volume 29 Issue 01
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    Current Situation and Development of Underground Rubber-tyred Personnel Carrier
    ZHAO Jin-Yuan
    2013, 29(01):  1-6. 
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    Current situation, types, features of structural, basic safety requirements and its development trend of the underground rubber-tyred personnel carrier both at home and abroad are introduced briefly, especially the underground mining auxiliary vehicle manufacturers and properties of underground rubber-tyred personnel carrier and other basic situations were introduced on MINExpo2012 International Mining Exhibition.
    Research on Causes and Countermeasures of Containerized Transportation of Imported Iron Ores of Yangshan Port
    LI Chen, LIU Shu
    2013, 29(01):  7-9+48. 
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    With the development of construction of the international shipping center of Yangshan port, more and more iron ores are imported through container transportation, which is a new kind of transport mode for marine transport of iron ore.Advantages of imported iron ore by containerized transport with traditional bulk ship transport are compared, and the causes of this phenomenon are analyzed.The existing problems in imported iron ore by containerized transport in current conditions are pointed out, and it also give some suggestions of develop waterway-waterway transit for container transport iron ore and strengthen the supervision of import iron ore by container are proposed.
    Numerical Simulation Optimization of Panel Stoping Specification in Sanshandao Gold Mine
    MA Ming-Hui, SUN Xiang-Xin, WANG Lu-Hai, LI Jian-Jie
    2013, 29(01):  10-13+48. 
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    Taken the S12186 slope of Sanshandao Gold Mine as the panel method test slope, with a certain width of the slope, the reasonable width of the chamber was a critical factor which affects the safety production.Numerical simulation was done on five different specification of the chamber using FLAC3D, stress distribution, displacement distribution and plastic zone distribution of different plan were analyzed.The optimal specification of stoping is proposed, which provides some reference for safe stoping.
    Stress Distribution Law of “Three Hard” Surrounding Rock Tunnel with Great Depth and Thick Seams and Numerical Simulation Analysis
    HE Xiao-Jun, WU Jian-Hu, ZHANG Chun-Meng, XIAO Bin, WANG Yu-Ling, LI Cheng-Fei
    2013, 29(01):  14-16+41. 
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    Due to the surrounding rock condition of one thousand meters deep, thick coal seams and "three hard" in Fangshan Coal Mine of Henan Pingyu Coal & Electricity Co., Ltd, surrounding rock stress distribution law during drivage and deformation situation of tunnel after support were simulated by FLAC, analysis of risk of rock burst during tunnel excavation was done, stress concentration factor of vertical stress and horizontal stress of surrounding rock of tunnel was 1.8 and 1.56 under such conditions, shearing strength in offside of foursquare of tunnel was biggest.Deformation of surrounding rock of tunnel is small under the normal excavation, tunnel stress will double increase with rock burst risk under complex geological structures or subjected to impact of mining.
    Numerical Simulation Optimization of Access Structure Parameters
    LI Xiao-Dong, LIU Guang-Cheng, WANG Wei
    2013, 29(01):  17-18+71. 
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    To get optimized access structure parameters, finite element analysis was done on six different kinds of access structure parameters plans using ANSYS.Vertical displacement curves and vertical stress curves of access mining process of different plan and different specification were obtained.Combined with geological condition and relative productivity of Xinli mining area of Sanshandao Gold Mine, optimized access structure parameters of access width 4.0m and height 3.0m were obtained.It can guarantee the safety and high efficiency mining of access.
    Stability Analysis on Large-scale Mined Ore-rock by Point Column Mode of Coastal Gold Deposit
    WANG Rui-Xing, SONG Hong-Tao, WANG Ping
    2013, 29(01):  19-20. 
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    Orebody of Xinli mining area of Sanshandao Gold Mine is under the sea, strata movement and deformation which lead to penetration of sea water are not allowed in mining process.On the premise of overall planning of stope structure parameters and mining technology parameters of mining engineering, mining sequence, size and arrangement mode of pillar and thickness of roof and bottom pillar, through numerical analysis, seabed deformation laws under large-scale mining are obtained, while the reasonable mining methods and structure parameters are proposed.
    Neural Network Discriminant Method of Rock Blasting Classification
    PAN Yong, YANG Tian-Xiang
    2013, 29(01):  21-23. 
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    Based on neural network technology, BP neural network discriminant model of rock blasting classification was designed by using MATLAB software.Rock blasting classification discriminant of 7 different kinds of rock in a iron mine were done by using this model.Comparative analysis was done between this discriminant results and discriminant results by fuzzy identification method, the conclusions were the same.Meanwhile, it shows BP neural network model designed by using MATLAB language has characteristics of simple and accurate, and it also has high feasibility and objectivity.
    Similar Material Model Test on the Failure Height of Overburden Rock under the Mining Influence in Liuhe Coal Mine
    XIA Yu, LI Xin-Wen
    2013, 29(01):  24-26. 
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    The similar material model test was used to study the influence law of mining of 13021 working surface of Liuhe Coal Mine to failure height of overburden rock, while the sand-proof pillar was also determined.Dynamic evolution process of the failure height of the overburden rock during mining process of 13021 working surface was analyzed.Through the different section of the similar material model test, the test results indicate that the average thickness of full-seam mining at 13021 working surface is 2.7m, and the maximum height of overlying rock caving zone is 16.1 m.The results of model test have certain of reference value for the establishment of sand-proof pillar.
    Research of Hematite Beneficiation for Nanfen Concentrator
    DONG Shi, LIU Jun
    2013, 29(01):  27-32+63. 
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    Since the commissioning of Hematite plant of Nanfen Concentrator, there always exists the problems of low grade Fe concentrate especially the Fe concentrate in flotation (only 59%), and low Fe recovery (only 65%).Therefore, according to the beneficiation practices of the similar mines at domestic, and the nature of Hematite in Nanfeng concentrator of Bensteel group, small beneficiation tests are carried out respectively by the three processes of stage grinding-medium intensity magnetic separation-high intensity magnetic separation-reverse flotation, stage grinding-low intensity magnetic separation-grade increase with fine screening-high intensity magnetic separation-reverse flotation, stage grinding-classification-gravity-magnetic separation-floatation.Then, iron concentrate with Fe grade of over 65% and recovery of over 70% can be realized by each process.The experiments indicates that on-site insufficient grinding leading to low grade concentrate of high intensity magnetic separation and for flotation is the main reason for the non-ideal flotation.
    Experiment on Iron Increase of Ningnan Hematite with Magnetic Roasting-Magnetic Separation-Reverse Flotation
    ZHANG Han-Quan, TAN Fang-Fang, GONG Li, ZHANG Hua
    2013, 29(01):  33-37. 
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    Ningnan iron ore belongs to low magnetic oolitic hematite with low Fe grade and high content of impurities such as SiO2, Al2O3, which can not be used directly.By adopting the process of coarse grinding-low intensity magnetic separation- fine grinding-demagnetizing-low intensity magnetic separation, Fe concentrate with Fe grade of 56.31% and the recovery of 80.89% was achieved, but the content of SiO2, Al2O3 are still relatively high.Then, through the reverse flotation tests with different agents and the close-circuit tests, final iron concentrate with TFe grade of 58.65% and recovery of 87.01%, and total recovery of 70.04% was achieved.The experimental results show that the process above is great feasible and can be used as reference for the beneficiation of oolitic hematite.
    Experiments on Improvement of Cu-Pb-Zn Flotation Index with New Pharmacy
    HU Xian-Li, PAN Rui-Tao
    2013, 29(01):  38-41. 
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    In order to improve the copper, lead and zinc flotation index of Xinjiang Cu-Pb-Zn polymetallic ore, the flotation tests are made.With the use of new agent ester-8 and B6 in close-circuit tests, copper concentrate with Cu grade of 22.61% and recovery of 50.19%, lead concentrate with Pb grade of 52.57% and recovery of 81.24%, and zinc concentrate with Zn grade of 55.46% and recovery of 91.40% were obtained.Comparing with the current agents scheme, the copper, lead and zinc recoveries were increased by 4.63, 1.77 and 1.34% respectively with the new agent.
    Stability Analysis on the Cemented Filling Body in Deep Mining Area
    LIN Min, SU Cheng-Zhe, ZHOU Xiong-Chao
    2013, 29(01):  42-44+54. 
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    Macromechanics analysis of X-type shearing failure, shearing-failure, drumming slope-split leather-fracture damage were done on stability of backfill of deep stope of copper mine in Anqing city through deformation phenomenon of backfill, different depth monitoring was done by using inclinometer, analysis model of overall stability of backfill was established by adopted Mohr Criterion, collapse laws of X type shearing, shear type, drumming slope-split leather-fracture occurred at partial slope wall of backfill were obtained.Analysis results indicate that different height of the filling body stability exposure need to meet the condition of minimum normal stress value, while it has important guiding significance for backfill strength plan making.
    Numerical Simulation of Surface Deformation Law Induced by Safety Pillar Stoping
    GAO Zhi-Guo, XU Tie-Jun, DU Jian-Hua, CAO Hua-Bing, CHEN Hong-Tao, SHI Jin
    2013, 29(01):  45-48. 
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    Master surface deformation law of safety pillar in stoping process has an important meaning for protection of surface buildings and structure.Taken the Chengchao Iron Mine as an engineering background, surface deformation of western safety pillar in stoping process was analyzed by FLAC3D and from five aspects as surface horizontal deformation, ground settlement, plant location surface deformation, stress analysis and plastic zone analysis, surface deformation law was obtained and stoping suggestions were proposed.
    Numerical Simulation of Flow Characteristics of Fire Smoke in Ramp of Metal Mine
    DENG Yao-Zeng, ZHAO Zhen-Peng, SHI Lu-Bing, YANG Zhi-Bin, LIU Duo-Wen
    2013, 29(01):  49-54. 
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    Based on layout characteristics of tunnel of metal mine and fractional characteristic of air flow after catastrophe, mathematic model of multi-components wind flow was established by adopted k-ε two-equation model, numerical simulation was done on multi-components wind flow after catastrophe of ramp by using hybrid scheme and SIMPLE algorithm based on collocated grid.Simulation results indicate that volume fractions of contamination in simulative tunnel length range are greater than national standards, while it seriously affects safe production of mine; influences range of ramp catastrophe at downwind side of crossheading was large than upwind side catastrophe's, influences of middle plate crossheading fire to working surface was most serious, high concentration pollutants spread to the whole working surface, which is key precaution area of fire prevention; influences of air flow to catastrophe are big, air flow control at catastrophe period is the important direction of fire control of metal mine.
    Numerical Simulation on the Law of Gas Distribution in Goaf
    ZHOU Fa-Ming
    2013, 29(01):  55-57+63. 
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    Gas problem seems quite serious with the extension of mining depth of coal in China, especially the widespread of the upper corner gas exceeds the limit, which is a key restraining factor to production of last, stable, safe and efficient of mine.To discuss the basic reason of upper corner gas accumulation, theoretical analysis was done on gas migration law in goaf according to percolation theory in hydromechanics.Through the numerical simulation was done on established mathematical model of seepage and distribution of gas of goaf, flow distribution of gas of goaf was analyzed It provides theoretical foundation for upper corner gas concentration distribution analysis and the concentration prediction, which has important guiding role for control of upper corner gas.
    Analysis and Control of Rockfall Hazard at Shangyu and Mazikeng Dump of Yunye
    CAI Guo-Qing
    2013, 29(01):  58-60. 
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    To make full use of limited resources of mine, split-recovery was done on waste rock of dump of Yunye Mazikeng.A few of stones rolling down caused by mechanical disturbances during split cut slope, which is the main disaster in resources recovery.Through analysis of influence factors to rolling stone by computational simulation of rockfall impact, corresponding prevention measures were proposed.It ensures the safe operation of this dump during resources recovery.
    Analysis on Slope Geologic Disasters of Open-pit Coal Mine and the Influence Factors
    ZHAO Xi-Gang
    2013, 29(01):  61-63. 
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    Main characteristics of slope and landslide geologic disasters of open-pit coal mine were analyzed, and main landslide mode of slope of open-pit coal mine was confirmed.Through practical data, slope model was established.The influences of slope angle, strata inclination, groundwater, weak intercalation to stability of slope were analyzed.Situation of groundwater and structural plane should be considered in time and adopt reasonable measures to prevent the happen of slope geologic disasters during mining of open-pit coal mine.