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    15 August 2010, Volume 39 Issue 8
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    Progresses in Mathematical Modeling and Computer Simulation of  Comminution with High-Pressure Grinding Rolls
    LIU Jian-Yuan
    2010, 39(8):  1-6. 
    Asbtract ( 1836 )  
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    The paper introduced the research progresses hitherto made in the mathematical modeling and computer simulation of comminution with HPGR，and progresses on predicting the comminution performance of industrial scale HPGR and optimizing design and operating parameters of comminution circuits through the computer simulation by applying the mathematical modeling of the comminution.
    Research on the Mechanical Prosperities of Foamed Mortar Backfill and Its Application
    CHEN Zhong-Ping, DI Shu-Hua, GAO Qian, DONG Lu
    2010, 39(8):  7-10. 
    Asbtract ( 2042 )  
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    In order to apply the foamed backfill to the underground cutting and filling mine successfully，based on the mining technical condition of stope east of F17，Jinchuan Corporation，the laboratory tests and in-situ experiments on the physical and mechanical properties were carried out.Then，the mechanics and backfilling effect of foamed backfill were studied by numerical methods .The field test results show that the foamed concrete filling material has such characteristics as good fluidity，high filling quality and low cost ect.The results of theoretical analysis show that for the condition of surrounding rock mass in stope east of F17，and the foamed backfill of having the same ratio of cement as the ordinary backfill can not only increase the mechanical parameters of backfill，but also can realize higher tight-filling ratio，which can efficiently control the rock mass displacement and assure the stability of stope.Therefore，it is feasible to apply the foamed backfill to the stope east of F17，and the industrial tests of stope backfilling with foamed backfill are carrying out.
    Support Technology of the Pump House in Deep Swelling Soft-rock under High Stress
    Meng-Qing-Bin, QIAO Wei-Guo, LIN Deng-Ge, WEI Lie-Chang
    2010, 39(8):  11-14. 
    Asbtract ( 1995 )  
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    Based on the rock mechanical tests，mineral composition analysis，ground stress test as well as failure mechanism analysis of the pump house in Tangkou coal mine，the combined support system with bolt anchor-truss and bolt-grouting as core was proposed to solve the support problems of deep swelling soft-rock large chamber under high stressThe monitoring results indicate that the maximum surrounding rock deformation of the pump house is only 6 mm and the average deformation of three monitoring sections is only 4.7 mm after the reinforcementThe results indicate that the combined support system with bolt anchor-truss and bolt-grouting as core has improved the self-bearing capacity of surrounding rock and the integrity of supporting structureIt can effectively control the deformation of the surrounding rock and floor heave and maintain the long-term stability of the surrounding rock of the pump house
    Study on the Recovery Proposal of the Deep Remanent  Ore-body in Qingtonggou Mercury-antimony Mine
    Zhang-Wen, HUANG Ru-Jie, ZHANG Wei-Bin, GUO Jin-Ping, CHENG Ping
    2010, 39(8):  15-17. 
    Asbtract ( 1879 )  
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    To fully exploit the resources，Qingtonggou Mercury-antimony Mine adopts the sublevel open stoping with delayed filling to recover the remanent ore-body at the medium stage of 550~600 m.The remanent ore-body has a medium thickness and not-steep slope.Moreover there are some mined-out area and the residual pillars above 550 m，resulting it difficult to recover the remanent ore-body.For research on the recovery of the remanent ore-body，and according to the numerical simulation results of calculation and analysis，the mining technology of the vertical sublevel drilling and sublevel tailings filling resulted in the successful recovery of the remanent ore-body.
    Study on the System of Mineral Resource Factor Endowments Based on System Dynamics
    Zhou-Huai-Feng, LI Yuan, ZHOU You
    2010, 39(8):  18-20，25. 
    Asbtract ( 2111 )  
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    Judging the endowment of the mineral resource usually concerns the mining rights evaluation and the mineral resources assessmentThe factor endowments of mineral resource are a determinant which impacts the mineral resource assessmentTaking coal resources for example，this paper analyzed the endowment of mineral resource，built a system of mineral resource endowment with the system dynamics modeling and made a detailed analysis on the subsystemsOn this basis，the flow chart of the system was established with Vensim software to make the system of the mineral resource factor endowment，presenting the model of utility function
    Research on the Recovery of Complex Boundary Pillar in Deep Mine
    FENG Fu-Kang, LUO Zhou-Quan, ZHANG Bao
    2010, 39(8):  21-25. 
    Asbtract ( 1878 )  
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    For the two-step deep mining with filling method，and due to the stope blasting design，the deviation of site construction or part collapsing of the goaf and so on，the pillar boundary would be extremely irregular，resulting in many problems including part collapsing of backfill and high loss and dilution of mine pillarAccording to the actual situation of Dongguashan copper mine，the three-dimensional models of two adjacent goafs were built by the Surpac with actual measured data by CMS on the basis of simulation analysis of RFPA2D for pillar，and the actual available pillar design model was achieved through compounding the goaf models and the designed pillar modelThe influence of blasting dynamic load to backfill was analyzed and forecasted，the close relationship of the distance from boundary holes to backfill，the selection of the charge amount and pillar mining was describedThen the reasonable extent of blasting design was gained and the optimization of pillar mining was achieved，regarding Surpac profiles as the basis of the pillar blasting design
    Analysis on the Influencing Factors of Reinforcement Mechanism of the Grouting Rock Bolt
    ZHU Xun-Guo
    2010, 39(8):  26-29. 
    Asbtract ( 1768 )  
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    further find out the reinforcement mechanism of bolt supporting of tunnel，the bolt's load transfer differential equation has been established according to the stress equilibrium in a small section of bolt and load transfer mechanics.Meanwhile，based on the rock mass deformation before and after bolt assembling，the rock bolt's load transfer equation has gained.In combination with the radial deformation of tunnel wall rock mass，the computing model for axial stress of grouting rock bolt in the ideal plastic rocks is induced，and the calculation model for the frictional resistance between the anchoring section and the rock interface is erected.Through analyzing the distribution of bolt stress and factors of affecting the stress distribution and size，it is concluded that the factors that affect the anchoring are the occasion of bolt installation and construction，the mechanical properties of rock，and the length of bolt.
    The Construction and Application of the Optimization Model of the Differential and Cut-off Grade
    Li-Gang, HU Nai-Lian
    2010, 39(8):  30-32. 
    Asbtract ( 1680 )  
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    The concept of the differential and cut-off grade is pointed out，and its mathematical model is built as well.With Microsoft's VBA macro language，the calculating program is developed and verified through the data from Jiaojia gold mine.It is concluded that the cut-off grade decreased with stages down，which provides a reference for the utilization of low-grade resources.
    Determination of Limiting Dump Height with the Critical Sliding Field Technology
    HAN Sheng-Lei, SUN Shi-Guo, LIU He-Zhai
    2010, 39(8):  33-35，38. 
    Asbtract ( 1979 )  
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    From the slope to the base，the slope critical sliding field technology is adopted to accurately and quickly determine the critical sliding surface of multi-layer and multi-step slopes with the arbitrary shape after calculation and to give an overall evaluation on the integrated and partial stability of slope.The reserve probe of the critical sliding field technology is carried out，where the safety coefficient is given to seek for the maximum slope angle.In combination with the engineering cases，the paper selected the correct slope face to keep the stability of the dump and design the limiting dump height.
    Stress Fields Evolution Law in the Piling-up Process of Waste Dump of Huge Soft Hill Base
    Sun-Shi-Guo, FAN Cai-Bing, LI Zhan-Ke, LU Hai, HAN Sheng-Lei
    2010, 39(8):  36-38. 
    Asbtract ( 1723 )  
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    The strength of huge soft hill base decides the piling up level and safety of the waste dumpsThe numerical analysis method was used to simulate the character and law of the stress field evolution of waste dump slope and huge soft hill base in piling up processThen the dangerous positions of sliding are found out，and the relation between plastic deformation zone and piling up height is givenThen，the paper adopts the limit equilibrium method to verify its stabilityBoth of results are basically the same，thus providing a scientific basis for waste dump design
    Numerical Simulation of Failure Process of the Reinforced  Sprayed Concrete in the Tunneling Support
    Song-Ai-Dong, 南Shi-Qing , YANG Fu-Jun, SU Ming, LI Cheng-He, JIANG Yan-Mei
    2010, 39(8):  39-41,54. 
    Asbtract ( 1933 )  
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    The crucial factor of sprayed concrete support is ensuring effectiveness of support modeThe important problem during the mine construction engineering is how to forecast the failure mode of the sprayed concreteA numerical code named Three-Dimension Realistic Failure Process Analysis is used to simulate the three-dimension failure process of sprayed concrete with mesh reinforcement under biaxial tensile stressIt gives the transformation process of stress field and crack development of the sprayed concrete with mesh reinforcementThe failure mechanism was analyzed and some suggestion was put forwardThe research plays a guide role in engineering practice.
    Stress Analysis on Freeze Sinking Sidewall's Damaging under Complicated Load
    WU Yue-Xiu, LIU Bin, YUAN Yang, HUANG Rui-Quan
    2010, 39(8):  42-45,78. 
    Asbtract ( 1794 )  
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    Taking the freezing sidewall as study target，and based on the stress states at stages of conduction and running，the damage model that is suitable to corresponding stress state is selected，and the anisotropic damage model including initial damage，which suit to make stress analysis for freezing sidewall is set upA three dimensional elastic damage program is compiled using FEPG software，which takes the following factors into consideration：temperature，conduction condition，concrete facture energy and aggregates so onThe FEPG software is adopted to simulate and calculate the elastic failures of the sidewall structure of Liangbosi mineAnd the sidewall's damage evolutionary process under complicated stresses such as permanence field stress，sidewall's gravity and vertical additional stress changed with time is obtainedLastly，the paper discussed the facture's position and its development process，and the mechanical mechanics of the sidewall's structure failure
    Effects of Coal Types on Direct Reduction and Dephosphorization  Synchronously of High-phosphorus Oolitic Hematite
    Xu-Cheng-Yan, SUN Ti-Chang, QI Chao-Ying, YANG Hui-Fen, LI Yong-Li, MO Xiao-Lan, LI Zhi-Xiang
    2010, 39(8):  46-50. 
    Asbtract ( 1882 )  
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    Taking three types of bituminous，one anthracite，one lignite as reductants，and with the mixture of SY1 and SY2（mass ratio of SY1/SY2=2∶1），the effects of coal types on direct reduction and dephosphorization synchronously were studied by the direct reduction roasting-magnetic separation process.The results showed that the fixed carbon and volatile in the coals were beneficial to improving the grade and recovery of iron in the DRI (Direct Reduced Iron) with different kinds of coal as reductants，the ash was disadvantageous to decrease the phosphorus content of the DRI.The effects of direct reduction and dephosphorization synchronously can be obtained by increasing the amount of different types of coal（dephosphorization agent）in a fixed dosage of dephosphorization agent（the optimum dosage of different types of coal.But the former needs lower costs than the later.Using five types of coal as reductants，DRI containing Fe more than 90%，P less than 0.1% were obtained at the appropriate amount of coal and dephosphorization agent.In comparison，a good effect can be achieved by the direct reduction and dephosphorization synchronously with lignite，secondly anthracite，poorly bituminous.
    Study on the Collecting Performance of Donganshan Hematite with the  New Combined Chelation Collector WM-1
    WANG Xiao-Fei, MI Jin-Yue, CHEN Xian-Long, ZHU Yi-Min
    2010, 39(8):  51-54. 
    Asbtract ( 1879 )  
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    This article describes the direct flotation tests under weak alkaline condition with the new combined collector WM-1 of the Sodium oleate and one self-made chelating collector in Donganshan hematite，comparing with the single sodium oleate.The results showed that under the optimal condition，Fe concentrate grading at 50.62%  with Fe recovery 85.05% was obtained with WM-1.However，with the single Sodium oleate，Fe concentrate only graded at 50.62% with Fe recovery rate of 90.22%.Moreover，WM-1 have the characteristics of low-temperature,The analysis of mechanism showed that the adsorption between the combined collector WM-1 and hematite includes the electrostatic adsorption and the chemical adsorption.
    Dephosphorization Efficiency of EM-501 on High-phosphorus Oolitic Hematite
    YAN Wu, ZHANG Yu-Shu, LIU Ya-Chuan
    2010, 39(8):  55-58. 
    Asbtract ( 1799 )  
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    A new dephosphorization collector EM-501 is prepared and used in the reverse flotation tests of dephosphorization for de-sliming products of high-phosphorus oolitic hematite from Chongqing Taohua and Hubei Guandian.For Taohua high phosphorus oolitic hematite，P content decreased to be 0.081% from 0.82%，with EM-501 as collector by the process of one-roughing，one-cleaning and two-scavenging after de-sliming.For Guandian hematite，P content dropped to be 0.21% from 0.89% by the reverse flotation process of one-roughing，one-cleaning and one-scavenging with EM-501 as collector.The experimental results confirmed that EM-501 had a collecting ability for phosphorus minerals with a good selectivity.So it is an effective dephosphorization collector for high-phosphorus oolitic hematite.
    Experimental Research on the Magnetic Screening for Crude Concentrate at Taihe Iron Mine
    Fu-Guan-Wen, YUE Tie-Bing, WANG Jian-Ye
    2010, 39(8):  59-62. 
    Asbtract ( 2326 )  
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    Taihe iron ore belongs to the vanadium-titanium magnetite.Now the process of two-stage grinding and stage magnetic separation is adopted on-site.But the large amount of the secondary grinding resulted in high costs.Moreover，the final concentrate grade can only meet the basic requirements of iron grading at 55% or more.In the laboratory，the crude concentrates are prepared by simulating the field flow-sheet.By using the magnetic screen，the re-concentration tests before and after re-grinding are made to investigate if possible to improve the final concentrate iron grade or reduce the amount of the secondary grinding.The results showed that: the final concentrate did not be improved after crude concentrate was screened by magnetic screening; And if the crude concentrate is directly separated by the magnetic screening before regrinding，a part of iron concentrate grading at 56% or more can be obtained in advance so as to reduce the amount of re-grinding of about 60%.
    Optimization of Magnetic Separation Process Flow-sheet for a Certain Limonite
    HUANG Hui-Chun, ZHOU Yue
    2010, 39(8):  63-65, 70. 
    Asbtract ( 1996 )  
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    In view of the crude ores' properties for a limonite dressing plant in Yunnan province，and some problems in production，and in combination with the experimental research results，the original process was optimized by adopting the blending and desliming of the feed，scavenging，control of grinding and classification， thickener expanding etc.Thus，iron recovery was improved by 19.55% with iron grade little lowered，and the production capacity and the concentrate yield are increased by 20%~25%，and 28.72 t/d respectively.
    Optimization of Lead-antimony Flotation Process for a High-carbon High-sulfur Polymetallic Ores
    FENG Zhong-Wei, NING Fa-Tian, WEI Wen-Ye, DONG Ming-Chuan, SHI Xian-Yi
    2010, 39(8):  66-70. 
    Asbtract ( 1796 )  
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    Due to the difficulties in lead-antimony flotation process of the high-carbon high-sulfur tin polymetallic ores in Nandan，and based on a large number of experiments，the lead-antimony flotation tests are made with the ammonium butyl aerofloat as collector，lead-nitrate as activator，NZ composite reagent as inhibitors，in acidic conditions.A good indicator has been obtained.According to the experiment results，some optimization on the original beneficiation process was made to obtain the concentrates of lead，antimony，silver grade as 24.87%，11.59% and 2 993 g/t respectively，and its recovery rate reached 87.01%，83.88%，89.79%.Thus，the valuable minerals have been effectively recovered.
    Study on the Beneficiation Ability of Copper from Deep Ore-body of Tonglushan Copper Iron Mine
    YANG Bing-Qiao, DENG Bing, ZUO Qian, WANG Fei, ZHANG Qin
    2010, 39(8):  71-74, 101. 
    Asbtract ( 1871 )  
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    To resolve the deterioration problems of mineral indicators caused by ore properties variation during the process of underground deep mining in Tonglushan copper iron mine，the beneficiation ability tests of copper for deep ore-body is made，based on the process mineralogy research.The results showed that：when the grinding fineness at the current production was improved from -0.074 mm 63% to 70% to -0.074 mm 85.9%，and the asynchronous flotation process was adopted with single butyl xanthate as collector，copper concentrate containing copper 22.85%，gold 14.27 g/t，silver 85.69 g/t at a copper，gold，silver recovery of 93.72%, 94.83%，82.34% respectively were achieved.While butyl xanthate + butylamine black were used as collectors，the recovery of copper，gold，silver can be increased by 1 to 2%，but their grades are slightly decreased.
    Experimental Study on Gold Flotation and Cyanide Leaching for a Certain Gold Ore
    Dai-Shu-Juan, HU Zhi-Gang, MENG Yu-Qun, BAI Li-Mei
    2010, 39(8):  75-78. 
    Asbtract ( 1846 )  
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    Since gold-bearing sulfide minerals exist in fine disseminated particle of a Liaoning Gold Ore and in close symbiosis with the gangue minerals，and contain high levels of easily clay ores，it is rather difficult to separate.The flotation tests were carried out.The results showed that under the grinding fineness of -200 mesh 95.3%，and taking sodium carbonate as regulator，sodium butyl xauthate+ ammonium-butyl aerofloat as collector，and 2# oil as foaming agent，gold concentrate with grade and recovery of 77.1 g/t and 79.58% respectively was obtained in flotation tests.Further cyanide leaching tests for flotation tailings were done.82.20% of the operating gold leaching rate achieved，resulting in the total gold recovery rate up to 96.37%.Researches results on the direct cyanide gold leaching method showed that the gold leaching rate was only 80.41%.
    Bioleaching Effect of a Uranium Deposit under Different Agitating Reactors
    Chen-Gong-Xin, WANG Guang-Cai, SHI Wei-Jun, LIU Jin-Hui
    2010, 39(8):  78-81,131. 
    Asbtract ( 1746 )  
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    By using the mixed mesophilic acidophilic bacteria which are separated and domesticated from the on-site acid mine water，the bio-leaching experiments on a refractory uranium ore are made by the pneumatic agitation and the mechanical agitation.The results showed that the bio-leaching rate of this refractory uranium ore can reach 89.2% with the mechanical stirring，and only 67.6% with the pneumatic agitating.It is clearly that the mechanical agitation is effective for bio-leaching of the uranium ores.
    Study on Electrochemical Flotation Behavior of Monoclinic Pyrrhotite
    Li-Wen-Juan, SONG Yong-Sheng, ZHOU Gui-Ying, WANG Qin-Qin, QU Wei
    2010, 39(8):  82-85. 
    Asbtract ( 1757 )  
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    The flotation behavior of the monoclinic pyrrhotite was studied through the single mineral tests.The results showed that the floatability of the monoclinic pyrrhotite in the system of butyl xanthate or sodium diethyldithiocarbamate (DDTC) is nearly the same，and its pulp potential has little influence on the flotation behavior.The sodium diethyldithiocarbamate (DDTC) has better ability to collect monoclinic pyrrhotite than butyl xanthate in the alkaline condition.Taking butyl xanthate as collector，and in acid，neutral or low-alkaline condition，the monoclinic pyrrhotite activated with CuSO4 can be nicely depressed by the combination reagent of sodium humic acid and calcium chloride.In the high alkaline condition of NaOH，the activated monoclinic pyrrhotite is difficult to be depressed by this combination reagent.While，in the high alkaline condition of CaO，the activated pyrrhotite can be depressed basically with the addition of sodium humic acid only.
    Processing Mineralogy in Advanced Oxide Copper Ore
    LI Bo, LIANG Dong-Yun, ZHANG Li-Li
    2010, 39(8):  86-88,101. 
    Asbtract ( 1864 )  
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    Advanced oxide copper ore existing in oxidation zone of Yunnan large copper mine has the following features: low Cu containing，high oxidizing rate，large amount of mud，several kinds of copper oxide minerals，complex disseminated relation，and so on.It is classified as refractory ore.Based on in-depth processing mineralogical research in the ore，its mineral component，disseminated relation of main copper minerals and occurrence state of copper element have been mainly examined and confirmed.These results provide the basis for making reasonable mineral processing flowsheet，and have important significances for development and utilization of this kind of ore.
    Effect of Sodium Stearate on the Crystal Growth of Hemihydrate Calcium Sulfate Whiskers
    Wang-Yu-Bin, YUAN Zhi-Tao, LI Li-Xia, HAN Yue-Xin
    2010, 39(8):  89-91,136. 
    Asbtract ( 2043 )  
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    The influence of the dosage of stabilizer，sodium stearate on the growth process of hemihydrate calcium sulfate whiskers was investigated through E-biological microscope，scanning electron microscope and Fourier transform infrared spectroscopy.The results showed that the absorption state was different with additive amount varied and the crystallization course of hemihydrate calcium sulfate was greatly affected by sodium stearate.So it is pointed out that the main reason for the different crystal shape of hemihydrate calcium sulfate is that the absorption amounts of sodium stearate is not uniform on their surface.
    Research Progress on the Beneficiation Tests of Ningxiang-type Oolitic Hematite
    Zhang-Yu-Shu, DING Ya-Zhuo, GONG Wen-Qi
    2010, 39(8):  92-96. 
    Asbtract ( 1916 )  
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    The paper summarizes the features and washability of Ningxiang oolitic hematite，describes the research status of beneficiation technique for the oolitic hematite.Then it is put forward that the different separation schedule should be given according to different process mineralogy characteristics varied with the origins of oolitic hematite.Meanwhile，the smelting performances of products obtained by several methods are evaluated.Finally the new research and development direction for oolitic hematite is pointed out.
    Application and Development Tendency of Beneficiation Technology of Hematite in China
    Gao-Tai, GUO Xiao-Fei, YUAN Zhi-Tao, HAN Yue-Xin
    2010, 39(8):  97-101. 
    Asbtract ( 1995 )  
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    The development status of stage-grinding，high-gradient fine magnetic separation，and reserve flotation progress are introduced.And it is pointed out that such processes are the developing trends of the beneficiation technique for hematite of China as the ultra-fine crushing-high intensity pre-concentration process，the high-gradient magnetic separation process for fine low-field magnetic minerals，and the low-temperature resistance and neutral regent for reverse flotation.     
    Development of Heap Bioleaching of Copper Sulphide Ores
    ZENG Wei-Min, QIU Guan-Zhou
    2010, 39(8):  102-107,111. 
    Asbtract ( 1596 )  
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    The paper presents the research focuses on heap bio-leaching of copper sulphide ores，including the screening of good bioleaching microorganisms and the optimization of heap bioleaching parameters.Two cases of the heap bioleaching of chalcopyrite in Kennecott Copper Mine in USA and the heap bioleaching of chalcocite in Zijinshan Copper Mine in China are described.
    Study on Connectivity Ratio of the Structural Plane in Yabiluo District
    Ma-Ping, SUN Qiang
    2010, 39(8):  108-111. 
    Asbtract ( 1801 )  
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    The structural plane is one of important geological flaws in the projectIn view of the structural plane in the southwestern Yabiluo district，the discontinuities of both sides of Nujiang are measured by the means of sampling windowAccording to the principle of Monte Carlo simulation，the visual basic program is compiled to simulate 2D rock mass joints to obtain the connectivity ratio of structural plane from the obtained discontinuous attitude and its track lengthThis provides a theoretical basis for the evaluation of rock mass and engineering design
    Pan Changjia，Chen Bin，Wang Yixia
    PAN Chang-Jia, CHEN Bin, WANG Yi-Xia
    2010, 39(8):  112-115+131. 
    Asbtract ( 1829 )  
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    Through analyzing the deposit characteristics and the prevenient geological work and summarizing the development practice within several years in Tongling Xinqiao Cu-S iron (gold and silver) deposit，this paper discussed the prospect of mineral deposits in the deep and outer regions，and pointed out the ideas and proposals for ore prospecting and problems that should be focused on in the prospecting process
    The Digital Dispatching System of Open-pit Mine Based on WiFi
    Wu-Wen-Jun, Jing-Shi-Gun, GU Qing-Hua
    2010, 39(8):  116-119,136. 
    Asbtract ( 1695 )  
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    In view of the request of the daily dispatching and location monitoring in open pit，the open pit dispatching system with integration of language communication，devices location，and video monitoring are realized with the WiFi technology.This system can not only meet the demands of production dispatching within the scope of mining area，but also realize the function of VOIP and wireless video monitoring，which provides a new technique to production dispatching management for open-pit.The field test indicates that the performance of this system is stable and can satisfy the requirement of mine production and management.
    The Application of WiFi Communication Technology in Jinding Mining Corporation
    Li-Hai-Bo, WU Wen-Jun, WANG Xue-Li
    2010, 39(8):  120-122,127. 
    Asbtract ( 2115 )  
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    In view of the real-time localization request of wireless communication equipment and personnel in the underground mine，WiFi (Wireless Fidelity) communication technology in combination with RFID (Radio Frequency Identification) technology were used to realize the dispatching system of location，monitoring and language communication for underground personnel and equipment.This system can not only meet the demands of moving office within the scope of mining area，but also provide the VOIP communication function.A powerful security for the underground safety supervision is supplied in production.The field test indicates that this system has a stable performance and can satisfy the safety production for mine.  
    PFC2D Numerical Simulation of Ore Drawing Rule with Pillarless Sublevel Caving
    WANG Pei-Tao, YANG Tian-Hong, LIU Xiao-Bo
    2010, 39(8):  123-127. 
    Asbtract ( 1868 )  
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    By adopting the discrete element method based on the particles flow，the numerical simulation on the rocks movement rule of ore-drawing and the process of rocks loss and dilution with pillarless sublevel caving method is made.Taking the ore recovery rate and the waste rock mixture rate as checking index，the pros and cons of ore drawing with the flat hopper and with the facade hopper are analyzed respectively.The research found out that under the same ore-drawing conditions，the former was more reasonable than the latter.Putting them in the same model，and by comparing the drawing-body's shape with five different friction properties of particles under the facade program，and when the structural parameters an ore-drawing program are fixed，the ore-drawing effect that are influenced by the bulk friction angle are shown as follows：the greater the friction coefficient between the particles is，the larger the eccentricity of the ellipsoid becomes.
    3D Modeling and Visualization for Interstitial Geohydrology Succession
    ZHANG Wei-Jun
    2010, 39(8):  128-131. 
    Asbtract ( 1681 )  
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    In view of the distributing complexity of interstitial geohydrology succession and current problem of 3D spatial dispersing in groundwater numerical simulation，the borehole data based on other geological data，like profile section，was used to divide the interstitial geohydrology succession into the upper and the lower.In order to ensure one-to-one correspondence of the upper and lower triangular，and if the self-decomposition operation of one layer top (bottom) level for one triangular is made，the bottom (top) level triangular also adopts self-decomposition.After building Triangulated Irregular Network for each level，the upper and lower vertexes of triangle are connected to form a triangular prism for the whole geological body.Each layer's Triangulated Irregular Network (TIN) has the same reference coordinate system and can correctly match and correspond with each other.Finally the 3D spatial dispersing is made on the interstitial geohydrology succession by the triangular prism.It can not only keep the type unitary of interstitial geohydrology succession，but also improve the 3D spatial modeling of the interstitial geohydrology succession and the precision of groundwater numerical simulation.
    Research on Three-dimensional Intersection Model between Vertical Shaft and Horizontal Tunnel
    ZHANG Zhi-Hua, HOU 恩Ke
    2010, 39(8):  132-136. 
    Asbtract ( 1702 )  
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    The digital mine is a hot research topic.Mine tunnel is core component in the whole mining production and is the most intuitive part in visualization of mine.Based on analyzing the current methods of three-dimensional modeling，the paper puts forward the division modeling method which can be used to construct the complex intersected model between vertical shaft and horizontal tunnels.Its idea is “divide and rule”，namely，dividing the intersection part into three individual entities and two spatial curves.According to analysis and calculation，the scattered points on the two spatial curves can be got.The vertical shaft is built by using adjacent contour modeling method.The 3D models of the horizontal tunnels are constructed by adopting the symmetrical modeling method.The whole intersected model is generated through composing vertical shaft with horizontal tunnels.Its advantage is that the whole model is inner connected with each other and seamless integration.It is shown that the method mentioned is feasible to deal with the intersection between vertical shaft and horizontal tunnels.    
    Effect of Copper Separation with Mixed Packing Cyclonic Static Micro-bubble Flotation Column
    Zhang-Min, SHI Chang-Sheng, LIU Jiong-Tian
    2010, 39(8):  137-139,141. 
    Asbtract ( 1966 )  
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    The mixed packing with cyclonic static micro-bubble flotation column is a packing mode of honeycomb tube packing based on sieve plate packing，arming to further weaken the effect of cyclone field on the column separation.The mixed packing and the sieve plate packing with cyclonic static micro-bubble flotation columns were used to separate Yunnan copper sulfide in a semi-industrial test respectively，and the results showed that both could shorten the flotation technological flow-sheet and save the dosages.However，the grade and recovery copper concentrate in mixed packing was higher by 2.28 and 1.18 % respectively.Thus the efficiency of the mixed packing is proved.      
    Research Features on of Air Core inside Hydrocyclone Based on  Hight Speed Collection Image Technology
    Wang-Zhi-Bin, CHU Liang-Yin, CHEN Wen-Mei, WANG Sheng-Gui
    2010, 39(8):  140-143. 
    Asbtract ( 1984 )  
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    The structural characteristics of the air core inside of the hydrocyclone under different cone angle and inlet flows are investigated by adopting the high-speed image technology.The results indicated that the shape of air core and its crackle varied with the cone angle and the inlet flows，which can not simply be described as column，twist or sinusoidal shape.Hence，to reduce the effect of the air cone on the classifying of the hydrocyclone，parameters of suitable cone angles and related optimal in-let flows should be selected for the hydrocyclone.
    Discussion on the Construction of Emergency Water Sump in Underground Water-rich Mine
    Hu-Xing-Bao, HU Dao-Xi, LIU Hai-Lin
    2010, 39(8):  144-147. 
    Asbtract ( 2079 )  
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    In view of the frequently occurring of underground water inrush disasters，leading to the huge damage to the mining personals and property，the concept and various programs of the emergency water sump were proposedThe establishment of the water sump provides enough time for emergency treatment for underground mine，which can avoid the people drowned and trapped so as to ensure the safety of mines.   
    Major Geological Disasters Type in Mining and its Control Countermeasures
    Guo-Wei-Jun, CUI Xiao-Yan, XIAO Gui-Yuan, WU Meng
    2010, 39(8):  148-151,159. 
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    With the rapid economic development and the creasing exploitation scale of resources，it gives the environment a lot of pressure.Due to the mining，and other factors such as management，technology，efficiency，awareness，the risks of geological disasters are becoming more serious，which greatly hamper the sustainable economic development.We must pay a close attention on it.This paper describes the major geological disasters which are prevalent in the mine of our country.And some control measures of geological disasters from technical and non-technical aspects are proposed.In non-technical aspect，the legislation should be strengthened.And in technical aspect，the forecasting methods such as TSP forecasting system，DC electrical method，and ahead of drilling，and the control blasting technique are introduced.As well as the environmental geotechnical engineering is used as a guide to prevent and control the geological disasters，and some of research experiences from the predecessors in control of geological disasters are summarized.
    Safety Assessment Model of Underground Mining based on the Fisher Discriminant Analysis
    SHI Xiu-Zhi, CUI Song, HUANG Min, QIU Xian-Yang-Sun-Lei, ZHOU Jian
    2010, 39(8):  152-155,182. 
    Asbtract ( 2031 )  
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    Mine safety is the ultimate guarantee to keep mining corporation stable，persistent and fast developing.Based on the Fisher discriminant theory，and combining with the standard of mine safety production，according to actual four mine characteristics of person，machine，environment，management， the main factors of index system of mine safety appraisal，such as mine underground mining processes and indicators of the reliability，twenty-three factors influencing of underground mine were defined as the criterion indices for safety evaluation in the proposed model，and the Fisher discriminant analysis model for safety assessment of underground mining was established.Taking 18 sets of parameter data of underground mine as training and testing samples，the ratio of mis-discrimination is 0.Another 4 groups of measured data are tested as forecast samples，the predicted results are consistent with the measured ones.And it is indicated that this method have a feature of low mis-discrimination ratio and good discrimination performance.So it is a new approach to provide advisable methods for the assessment of underground mine safety management status，and basis for scientific and safe management of the relative departments.
    Risk Assessment on Tailings Dam Break Losses
    Shu-Yong-Bao, LI Pei-Liang, LI Zhong-Xue
    2010, 39(8):  156-159. 
    Asbtract ( 1753 )  
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    The economic loss risk on the accident of tailings dam break was assessed from aspects of the loss of life，property and environmental resourceThen，the severity of tailings dam breaks was classified according to both the deaths and its economic loss riskAt last，the losses influence of the accidents of tailings dam break on local social and economic in different area were comparable based on an overall consideration of space factorsThe advantage of this method is easy to operate with high operability，which provide evidences for the quantitative evaluation of the loss risk of accident and the priority definition to remove the hidden dangers of tailings damAnd it is beneficial for improving and optimizing the risk assessment of tailing reservoir  
    Hazard Assessment and Countermeasure of Debris Flow in Fanshen Gully
    DENG Min, WU Xin-Xing, XU Qing
    2010, 39(8):  160-162. 
    Asbtract ( 1769 )  
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    According to geological survey data，the paper discussed the basic characteristics，the occurring mechanism，the scale and development trend of debris flow in Fanshen GullyIn addition，through evaluating the hazard degree of Fanshen Gully with a multi-factor hazard assessment formula，it is concluded that this debris flow risk degree is 0.51，belonging to the moderate risk of debris flow gulliesIn view of existing resources and destructive ability of disaster，as well as the surface features，geological structural features around danger zone，a comprehensive prevention and control measure with blocking as main and dredging as auxiliary is proposed to ensure the safety of residents，provincial roads and other life properties in Fanshen Gully
    Construction and Improvement of Multi-stage Station Ventilation System in Meishan Iron Mine
    ZHU Sheng-Hua, XU Zhi-Qiang
    2010, 39(8):  163-166. 
    Asbtract ( 1718 )  
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    Through the construction and improvement of phaseⅡventilation systems in Meishan Iron Mine，researches on multi-stage ventilation system are carried out to straighten the ventilation network and unify the fan model.Meanwhile，the “dual return-air system” program is proposed to achieve the centralized control of the ventilation system，thus leading to an economic，efficient operation for phaseⅡventilation systems.
    Application of Uncertain AHP to the Safety Assessment of Tailing Dam
    ZHU Jun-Xing, LI Cai-Li
    2010, 39(8):  167-170. 
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    Tailings Dam is an artificial root of high-level debris flow，where there are many hazards and accident risks，which are affected by many uncertain factors.Once the accident happened，it would seriously threaten the surrounding environment in the reservoir area，the downstream people and their property.Based on several major factors which affect the safety of tailings dam，and considering the shortcomings of the traditional AHP in the safety assessment，the safety assessment model of the tailing dam was established with uncertain AHP，and its index system was determined based on the reality of tailings.
    The Modified Effect of Arbuscular Mycorrhizal Fungi on the Fe Tailings Substrate
    Zhang-Cui-Qing, BI Yin-Li, YU Miao, CHEN Bao-Dong
    2010, 39(8):  171-174. 
    Asbtract ( 1677 )  
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    Four different ecotypes of arbuscular mycorrhizal fungi are added into the tailing substrate of MaSteel Nanshan Iron Mine，and its modified effects are contrasted by the pot tests of planting alfalfa.The results show that: after comparing with the reference，all four kinds of different ecological types of fungi could enhance the acid phosphatase activity of alfalfa rhizosphere soil，and raise the phosphorus absorption capacity from tailings substrate of alfalfa.Among these，〖WTBX〗Glomus intraradices〖WTBZ〗 from a copper mine has an optimal effect on modifying the physical and chemical properties of tailing substrate and promoting the growth of alfalfa.
    Research on Adsorption Performance of Red Loess on Cr3+ and Cd2+
    ZHAO Mei-Qing, MA Zi-Chuan, XING Sheng-Tao, WU Yin-Su
    2010, 39(8):  175-178. 
    Asbtract ( 2045 )  
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    The experiments on the Cr3+ and Cd2+ removal from water with red loess as the sorbent are carried out，and the influence of pH，contract time，adsorbent dose and temperature on the adsorption of Cr3+ ，Cd2+ was studied.The isotherms at different pH and temperatures have been determined.The results indicate that the red loess has a better adsorption effect on Cr3+ than Cd2+.Under a certain condition，the removal rate of Cr3+ can reach 99.5%，while that of Cd2+ maximize to be about 63%.Both adsorption behaviors are fitted to the Langmuir monolayer adsorption model.According the results，it is considered that red loess is expected to become a new-type adsorbing material for treating the waste water of containing heavy metal ions.
    Absorption of CTMAB Modified Bentonite to the Reactive Brilliant Blue
    ZHANG Feng-Jie, 欧Xiao-Xia , WANG Yang-Ji, CHEN Jing-Wen, YANG Hui-Ying, WU Yun-Na
    2010, 39(8):  179-182. 
    Asbtract ( 1852 )  
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    Crude bentonite was modified by using sodium carbonate and cation surfactant cetyltrimthylammonium bromide（CTMAB）.The CTMAB modified bentonite was characterized in structure by IR and XRD.Taking CTMAB modified bentonite as adsorbent，the absorption decolourization tests on the reactive brilliant blue dye wastewater are made.The results showed the CTMAB modified bentonite resulted in a stronger decolourization efficiency than the original soils，and its decolourization rat can reach 91.98% under conditions of the reactive brilliant blue 50 mg/L，pH=7，the dosage of modified bentonite 50 mg/L at the adsorption time of 50 min.
    Yan Qun，Huang Junwen，Tang Meixiang，Lai Hua，Luo Xianping
    YAN Qun, HUANG Jun-Wen, TANG Mei-Xiang, LAI Hua, LUO Xian-Ping
    2010, 39(8):  183-186. 
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    The paper analysed the sources of mine wastewater and its damages，introduced research progress of five wastewater treating techniques as acid-base neutralization，coagulation sedimentation，chemical oxidation，constructed wetland and biological treatment.