Loading...
Welcome to Metal Mine! Today is Share:

Table of Content

    08 March 2011, Volume 27 Issue 3
    Previous Issue    Next Issue
    Finite Element Analysis for Seepage-Stress Fields Coupling in Backfill Area of Caving Mining
    LI Li-Wu, WANG Qiang, WANG Shui-Ping, PENG Rong, ZHOU Wen-Hou, XIAO Jin-Sheng
    2011, 27(3):  1-3+43. 
    Asbtract ( 1386 )  
    Related Articles | Metrics
    Taken the backfill area of caving mining of Jinshandian iron mine as the example, the mathematical model for seepage and stress coupling in backfill area of caving mining was set up, coupling characteristics of seepage and stress field were analyzed. Simulation results indicate that seepage velocity is higher around laneway, seepage quantity through laneway boundary is 1.3×10-3 m3/（s·m）. Compared with uncoupled condition, the value of the whole head of coupled condition is reduced totally, and the influence is much obvious especially in the bottom area. Coupling has certain influence to stress field. Whole head value reduces gradually with the increasing of coupling coefficient β.
    Numerical Calculation Optimization of Stope Structural Parameters under Highway Phosphorite Mining
    SONG Yuan-Bing
    2011, 27(3):  4-5+58. 
    Asbtract ( 1312 )  
    Related Articles | Metrics
    Partial orebody of Yongshaba mine of Guizhou Kailin Group located below Jinyang highway which the amount reaches to 22 620 000 ton. Room and pillar type medium-length hole fall ore afterwards cementation filling mining method based on the test and analysis of mechanics parameters are done on ore-rock. Meanwhile, stope structural parameters are selected by numerical calculation method, and safe exploitation of phosphorite under highway is realized.
    Numerical Simulation on the Instability and Resurrection of Large-scale Mined-out Areain Wudaoling Molybdenum Mine
    LIU Chao, YANG Shi-Jiao, WANG Hong-Wu, QIAO Hong-Bo
    2011, 27(3):  6-8. 
    Asbtract ( 1411 )  
    Related Articles | Metrics
    Large-scale mined-out area are formed in molybdenum mine of Wudaoling due to disorderly exploitation, 3 times of large-scale ground pressure activities are caused one after another, and a great number of pillars were broken. Due to the geometric shape situation of complicated mined-out area, the three dimensional numerical model of mine left behind mined-out area was established. Numerical simulation was done on distribution of stress, displacement and plastic zone of upper mined-out area and isolation strip by MIDAS. The numerical results indicate that the large-scale mined-out area in molybdenum mine of Wudaoling must be filled, otherwise, instability and resurrection phenomenon is extreme possible appear.
    Numerical Simulation on Blasting Effect of Different Charge Length in Blasting of a Open Pit Coal Mine
    YUAN Shao-Guo, ZANG Jian-Ling, WANG Li, ZHOU Lian-Chun, WANG Rui-Zhi
    2011, 27(3):  9-11. 
    Asbtract ( 1415 )  
    Related Articles | Metrics
    Blasting effect of different charge length were simulated on fixed parameters like pitch of holes, distance between two rows, aperture by LS-DYNA. Effect comparison of charge length 56cm and 64cm were done separately aim at Von Mises Stress，Y-displacement, Y-velocity which the characterized rock crushing effect is much direct, and finally the reasonable charge length was confirmed.
    Study on Deep Hole Blasting Destressing Prevent Underground Impact Pressure
    DAN Kun-Hang, LI Shu-Zhong, LIANG Han-Xuan
    2011, 27(3):  12-15. 
    Asbtract ( 1710 )  
    Related Articles | Metrics
    The effect of deep hole pressure release blasting on impact ground pressure treatment is accepted by miner.Through analysis of blasting rock-broken theory, the basic principle of blasting destressing was proved, applications of deep hole blasting destressing on impact ground pressure prevention was researched. The main parameters of deep hole blasting like borehole diameter, borehole spacing, hole depth, sealed borehole length and so on are confirmed and optimized.
    Experimental of Coal-Rock Permeability under Different Stress Combination
    LI Wen-Pu, WANG Meng-Lai, TANG Qiang
    2011, 27(3):  16-19. 
    Asbtract ( 1368 )  
    Related Articles | Metrics
    Based on self-developed triaxial servo gas-seepage experimental device of gas heat solid coupling, gas-seepage experiments were conducted on coal rock under the combination of different axial compression, confining pressure and gas pressure, complete stress-strain under combination of different confining pressure and gas pressure and influence law of coal-rock permeability under different stress combination were researched. The result indicates that there are three stages of permeability of coal-rock with the change of volumetric stress; permeability decreased with the increase of confining pressure, and it shows conical relationship with confining pressure, the influence of confining pressure was bigger than axial compression to permeability under the condition of certain axial compression and gas pressure; Permeability decreased first then increased with the increase of gas pressure, and it shows cubic curve relationship with gas pressure, slippage effect occupies an leading position at stage of permeability decreasing under the condition of certain axial compression and confining pressure; Permeability increase with the increase of axial compression, it decreases with the increase of confining pressure and shows linear law under conditions of a certain gas pressure and the same volumetric stress.
    On the Leaching of Copper Mine Tailings from Tangdan by NH3·H2O-(NH4)2CO3
    MA Jian-Ye, LIU Yun-Qing, HU Hui-Ping, CHEN Qi-Yuan
    2011, 27(3):  20-23+61. 
    Asbtract ( 1286 )  
    Related Articles | Metrics
    The leaching of copper from the tailings of refractory copper oxide ore which comes from Tangdan in Yunnan Province in China by aqueous ammonium chloride/ ammonia solutions has been studied.The results show that leaching time，the temperature, the concentration of ammonium chloride and ammonia，the solid-to-liquid ratio， the amount of the Oxidant，additional order of the oxidant，oxidation time have favorable influence on the leaching ratio of copper oxide ores. The optimum leaching conditions are found to be: 10/1 liquid-to-solid ratio, 40 ℃, adding to H2O2（2.5 mL/g）, after 2 hours，then add to（NH4）2CO3 and NH3·H2O, c(NH+4)=3.2 mol/L, c(NH3)=0.8 mol/L，continue reacting 4 hours. More than 72.3% of copper was effectively recovered.
    Research on the Technology and Recovery of Vanadium Extraction from Stone Coal
    ZHU Jun, GUO Ji-Ke
    2011, 27(3):  24-27. 
    Asbtract ( 1328 )  
    Related Articles | Metrics
    Stone coal vanadium ore is our peculiar vanadium resources with abundant reserves. In recent years, the manufacture and research of the technology on vanadium extraction from stone coal are developing rapidly. Discussed the main technology of vanadium extraction from stone coal,bases on this point, analyzed the key problems which affected the technology of vanadium extraction from stone coal with comparing the advantages and disadvantages of each technology and industrial applicability, then analyzed the recovery influence by roasting and leaching stage. Summarized the research direction of vanadium extraction from stone coal.
    Research on Stage Selective Flotation  of Molybdenum
    ZHU Sheng-Lin
    2011, 27(3):  28-31+71. 
    Asbtract ( 1401 )  
    Related Articles | Metrics
    The flotation technic of sizhou concentrtor is copper-molybdenum bulk floration at present. The recovery rate of molybdenum only got around 50% because of the effect of the lime.By bringing into the process of  priority selecting copper before molybdenum and adding MBF-103 collector, relized the priority selecting molybdenum at first stage, and improved the recovery rate of molybdenum.
    Design and Application of Static Magnetic Field Demagnetizer Based on High Power IGBT
    BA Qing-Wei
    2011, 27(3):  32-33+39. 
    Asbtract ( 1359 )  
    Related Articles | Metrics
    Along with development of beneficiation technology, dressing plants request higher quality of pulp demagnetization. Longi Magnet Co.,Ltd has developed LTC series of static magnetic field demagnetizer based on high power IGBT. Introduced the presents the design principle, main feature and its application.
    Environmental Problems in Process of Guizhou Province's Mineral Resources Exploitationand its Countermeasures
    HU Zhi-Yong
    2011, 27(3):  34-36. 
    Asbtract ( 1492 )  
    Related Articles | Metrics
    Environmental problems, such as endemic disease,acid mine water, coal-fired sulfur dioxide pollution, acid rain, pollution effect of waste water discharged from process of aluminum smelting and phosphor chemical engineering to around surface water produced during process of mineral resources exploitation in Guizhou province, and the influence from solid waste which produced from process of mine mining and mineral products processing to surrounding environment are introduced. Measures like enhance the management to enterprise pollution treatment, pollution control concept innovation, karst area location argumentation and banning mine enterprises in water source region and so on are proposed to protect surrounding environment.
    Neural Network Model of Gas Extraction Rate Prediction at Coal Face
    ZHANG Ming, FENG Tao, ZHU Zhuo-Hui
    2011, 27(3):  37-39. 
    Asbtract ( 1510 )  
    Related Articles | Metrics
    As influencing factors of gas extraction rate at coal face are complicated, nonlinear relation which are dynamic and vague exist between each influencing factors, prediction model is hard to establish on traditional prediction methods. Neural network has the characteristics of self-organization, self-adaptive, parallel processing and strong nonlinear approximation ability. The prediction model was established based on functional relationship between gas extraction rate at coal face and its influencing factors. The result indicates that the precision of the prediction model could meet the request, and the model is reasonable and feasible.
    Analysis on Influence Factors of dust wetting agent of Coal Mine
    GU Meng-Ping, TIAN Dong-Mei, YAO Jian
    2011, 27(3):  40-43. 
    Asbtract ( 1539 )  
    Related Articles | Metrics
    Nonionic wetting agent and anion wetting agent were selected to combined through the laboratory test, and it aim at different metamorphic grade coal sample and efficiency of dust collection, analysis was done on the relationship between aqueous solution thickness and moist time of wetting agent. The result indicates that aqueous solution concentration 20%~40% is the best of nonionic wetting agent and anion wetting agent. With increase the metamorphic grade of coal in the same kind of wetting agent, nonionic wetting agent and anion wetting agent dust removal effect got worse and worse.
    Analysis and Evaluation of Water Disaster Factors of Longtan Coal Mine at Huayingshan Mining Area
    LEI Cai-Guo, CAO Shan-Hua, GUO Ping
    2011, 27(3):  44-48+61. 
    Asbtract ( 1494 )  
    Related Articles | Metrics
    Take Longtan coal mine of Huayingshan mining area which has typical and complicated geological conditions as the research object, the affect and threaten degree of each water source to mine production was analyzed and evaluated systematically. The evaluation model of threatening water was constructed, and Longtan coal mine area were divided into five water inrush threat levels: no water inrush threat area, weak water inrush threat area, middle-weak water inrush threat area, middle-strong water inrush threat area and strong water inrush threat area by using mine water disaster threat indexs.