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    15 February 2012, Volume 41 Issue 02
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    Numerical Simulation of Dehydration with Negative Pressure
    ZHANG Chao-Lan, ZHOU Ke-Ping
    2012, 41(02):  1-4+11. 
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    Forced dehydration with negative pressure can speed up the dehydration rate and reduce hydrostatic force to seal wall.So it is necessary to seek the dehydration rules and its best technology parameters.For this，corresponding finite element method program of numerical simulation of dehydration with negative pressure is developed based on FEPG (Finite Element Program Generator)，and the finite element numerical analysis model of seepage velocity and its influence factors is established.We employ orthogonal test theory to analyze seepage velocity at different dehydration parameters.The results show that the seepage velocity increases sharply with the increasing of differential negative pressure in dehydration tube，but the increase，to some extent，cannot be expected to be sustained; while it is monotone decreasing with growing of the distance of two adjacent vacuum tubes; And lowering the heights of tailings also has an obviously positive effect on the dehydrated efficiency.
    The Optimization of Parameters on Medium-length Hole Blasting Technique of a Metal Mine in the Middle-East
    WANG Yan-Long, MI Li-Ping, WANG Wei-Dong
    2012, 41(02):  5-8+76. 
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    In this paper，the technology of medium-length hole blasting during roadway excavation of a metal mine in the Middle East was studied.The technical parameters including hole layout，loading technique，connecting leg wire and blasting cable detonation methods were optimized according to the different features of roadway section design，explosives performance，drilling equipment，and etc.It was proved by production practice that the technology using optimized drilling blasting parameters have advantages of safety，high tunneling speed，regular roadway cross-section，low cost，and etc.The research could not only provide technical reference for domestic mining companies which enter mining market of Middle-East，but also beneficial to similar mine worldwide.
    Research and Application of Stoping with Pressure Relief in Beiminghe Iron Mine
    HE Rong-Xing, REN Feng-Yu
    2012, 41(02):  9-11. 
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    The ore-body in -95 m sublevel 4# stope of Beiminghe Iron Mine is gently inclined medium thick ore-body，and the floor of ore-body is at unstable strata and the fissure grows in joint.Moreover，it has been bearing the mining pressure from adjacent stopes for two years.The side fall root caving appeared during the tunneling of cross roadway and stope or after tunneling.Although lots of compressible “U”-shaped metal arch are adopted in secondary support，but the drifts' deformation and destruction can't be controlled.Therefore，the pressure relief measures are used，obtaining remarkable effect.The paper described the depressurized mining experience of 4# stope in detail，and discussed the parameters and the best time of pressure relief.
    Research of the Deformation Mechanism in Wang'ershan Mined-out Area
    QIU Yan, YOU Chun-An, WANG Rui, MA Zhuang-Zhi, WANG Shao-Hui
    2012, 41(02):  12-15+29. 
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    With No.1 and No.2 shaft in Wang'ershan Gold Mine as cases，the paper analyzed the failure mechanism of shaft and the influence factors resulted from collapse of mined-out area.And the current situation of shafts and mined-out areas were simulated numerically by the finite element numerical analysis method，which showed the distribution of surrounding rock's plastic zone in mined-out area，stress field，displacement field and the horizontal stress and displacement on the top of shaft lining.
    Application of the Overall Mining Method in Ergadiji Lead-zinc Mine
    SHEN De-Shun, XIE Xian-Ping, MA Fu-Chao
    2012, 41(02):  16-18+32. 
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    In view of the basic features of mine and ore-body and their occurrence conditions，and in combination with the technical conditions and devices in the company，the general overall mining method and its deformation program namedrelay electric rake mine comprehensive method were proposed，which can efficiently enhance the productivity and recovery and reduce ore dilution ratio，loss rate，labor intensity and mining cost as well.This new mining method can put into production quickly，and reach full capacity with high economic and social benefits obtained.Meanwhile，it is verified that this method is reasonable and feasible.
    Analysis of Dynamic Response of Slope Blasting Vibration in a Surface Mine
    DOU Xiao-Feng, ZHOU Yu-Xin, XU Chuan-Hua
    2012, 41(02):  19-21. 
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    On the basis of the basic principle of the dynamic finite elements analysis，and taking a Yunnan surface mine as a case，a dynamic analysis model of the slope blasting vibration is established.With the use of self-programmed procedure，the real speed time-history curve of blasting vibration is transformed into the accelerated time-history curve to calculate the loading.The modal analysis and time-history analysis of blasting vibration acceleration on slope is carried out by ANSYS software.The analysis results show that the dynamic response in the slope blasting vibration by means of the time-history method can actually reflect the dynamic characteristics of slope and the disturbance action of slope during blasting vibration.
    Analysis on the Behavior of Rock Permeability along Whole Stress-strain Path
    JIANG Dong-Hui, SUN Qiang, ZHU Shu-Yun, YANG Xiu-Yuan
    2012, 41(02):  22-24+44. 
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    Considering the relationship between permeability-strain curve and rock failure process，the variation characteristics of rock permeability with the stress and the correlation between permeability-strain and permeability-stress in the whole stress-strain process are analyzed.The results show that the rock permeability growth starting point nearly corresponds to the rock expansion point.The permeability in stress-strain path can be divided to three divisions，including compaction range，expansion range of pre-peak and post-peak range.It is proposed that the change of rock permeability is caused by the interaction of the smaller micro-scale level burst，which results into the forming of permeable channel.Meanwhile，the rationality of the analysis is verified through the test data.
    Research on Treating Civil Retention Goaf of Shallow Buried and Thin Ore-body with Uncover Backfilling Method
    GAN De-Qing, LU Hong-Jian
    2012, 41(02):  25-26+39. 
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    In order to study the reasonable approach to treat the civil retention goaf of shallow buried and thin ore-body. Taking a mine in Tangshan region as research background, a reasonable approach is proposed-the uncover backfilling according to the occurrence conditions and characteristics of civil mined-out area. It describes the applicable conditions and the implementation process of the uncover backfilling, which enriches the treatment of mined-out areas. The research results provide guidance to deal with the retention goaf of similar mine.
    Causes of Blind Shots during Medium-length Hole Blasting in Complex Stratum and its Prevention Measures
    PAN Yu-Zhong, CHI 恩An, CHEN Bin, XU Tao, ZHAO Fei
    2012, 41(02):  27-29. 
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    Industrial park in Hongqiao New Area of Guizhou Liupanshui is typical karst geological features.And there is a lot of rock seepage water，caves and cracks in rock.As a result，blind shots phenomenon often appears in local places in early engineering blasting.This paper analyzes and summarizes the causes of the blind shots combining with the engineering practice，and some preventive measures are put forwards.Then，the explosion blind shot rate is reduced significantly after explosion operations according to the prevention measures.It is thus clear that these measures are feasible.
    Application of Footwall Benchless Slope Mining Method in Xinqiao Open-pit Mine
    HUANG Wei-Qiang
    2012, 41(02):  30-32. 
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    Based on the geological and mining conditions，footwall benchless mining method for open-pits is firstly used in china，instead of the conventional open-pit mining design.176m high slope is created in Xinqiao open pit mine，and then high slope stability is studied.A series of measures are adopted in order to solve the problem of the stability of high and steep slope.Practices for many years in Xinqiao Mine indicate that the application of footwall benchless mining method for open-pits in Xinqiao Mine is successful，with good economic effects achieved.It can provide a reference for the exploration of similar mines.
    Analysis on Water Inrush risk induced by Fully Mechanized Caving onSuperhigh Seam in Complex Geological Condition
    LEI Jia-Hao, SUN Shi-Guo, FENG Shao-Jie
    2012, 41(02):  33-35. 
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    With the largest coal seam thickness of 130 m，Laohutai coal mine has 14 large-scale fault zones and mining history more than eighty years in，so the hydrological condition is very complex.The water inrush risk of Laohutai coal mine are analyzed by Midas-GTS software and engineering data，and the detailed analysis on water inrush source and channel is made.The water inrush source includes：aquifer of quaternary alluvium，surface water，water accumulation in movement basin，water in the faults and old mining area; the channel are mainly water flowing fractured zone and activated faults induced by mining.The conclusion is that the current 73003# and 73004# working face have high risk of water inrush，which are required to take the necessary measures for continuing mining.
    Similar Simulation Research of Mining Pressure Law under the Igneous Rock Situation
    DU Bin-Bin, LU Cai-Ping, LIU Biao, LIU Hui, WANG Yi
    2012, 41(02):  36-39. 
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    Based on the face of Ⅱ884-1 in Luling mine，the main roof breaking and stress variation under the conditions of different igneous rock was simulated and the results achieved are as follows：Under the condition of the same thick main roof，the more area the igneous intrusive，the more the peak strain of the pressure cells which is at the roof and floor is.When the igneous intrusion area is equal，the peak strain of the pressure cells is almost same.When the thickness of igneous rocks was increased，the distance of first breaking and cycle breaking increase accordingly.When the igneous intrusion area is the same and the thickness is not，the more the igneous rock thickness is，the higher the peak strain is.The research results not only provide a basis for roof control design and roof processing in the face，but also a technical reference for the movement and breaking of the roof under the conditions of igneous intrusion.
    Dynamic Support Technology of Coal Roadway in “Three Soft” Coal Seam with Complicated and Variable Composite-roof
    CHENG Jun-Feng, GAO Ming-Shi, WANG Wei-Dong, QIAO Xue, WANG Long-Long
    2012, 41(02):  40-44. 
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    Aiming at the problem of supporting for coal roadway in “three soft” coal seam，the deformation and fracture characters of surrounding rock and the interaction relationship between the surrounding rock and the support are analyzed，especially the problem of dynamic mechanical response to the support from the surrounding rock and so on.The dynamic support technology which takes new high-strength support methods including left-lateral high-strength pre-stressed anchor and m-shape steel strip and ultra high strength yield anchor cable and anchor cable beam and so on as key technologies are put forward from the whole process including the optimal supporting scheme and the optimal supporting time and the late reinforcement.This supporting technology has been applied successfully in 22071 roadway in Zaoyuan coal mine and can be served as a reference to the similar seam roadway.
    Experimental Study on the Mixture Ratio of Backfilling Pulp
    HU Zun-Jie, LI Ming, MIAO Qiang, HOU Xing-Yu
    2012, 41(02):  45-47+81. 
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    To make the worked-out section of an iron ore have no back water equipment and can not leak out slurry，we should ensure the backfilling pulp emulsify timely.This study by using the method of adding the water glass to the slurry and changing it’s emulsion time, and also by the mortar rheological test and injection-mold test, we can know the mobility and compressive strength in different concentrations and different cement-sand ratio.Finally, we identified the slurry concentration of 50%，cement-sand ratio of 1∶8 and water glass ratio of 1∶116 as the best ratio according to three factors of rheological properties, compressive strength and emulsifying time.
    Stability Control of Surrounding Rock with Multi-chamber in Deep Mine
    SUN Chang-Xing, HAN Li-Jun, LI Yun, DONG Ye-Mao
    2012, 41(02):  48-50. 
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    For the pump station of Shiping roadway in Henan Dengcao mine, as the complexity of surrounding rock stress conditions, high embedded depth and other factors resulted in the support difficulty increasing.In this paper, aiming at the destruction of this chamber, we used the numerical simulation software ABAQUS and analyzed the failure mechanism of this chamber, then we got the stress and displacement effects which the construction of pump house near the water storage chamber caused to the pump house chamber, thus we reinforced the rock mass between the pumping stations and water storage by using the “three anchor” support means in order to achieve the stability control of pump house chamber.Monitoring results show that the supporting program has played a good supporting role.
    Analysis of Stability for West-side Slope in Xiaolongtan Opencast
    SONG Zhi-Fei, WANG Xiao-Ting, PENG Hong-Yan, ZHAO Hong-Ying
    2012, 41(02):  51-53+56. 
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    There are some advantages as good working conditions，high security，guaranteed production capacity and low loss in open pit mining，therefore the opencast mining is increasing.The numerical simulation and limit equilibrium are used to calculate and analyze the stability of west-side slope 334 in Xiaolongtan Open-pit Mine under conditions of normal and saturation.Slope stability results under the two conditions provide a relative guarantee to take appropriate measures for post-mining safety protection.
    Inner Dumping Re-Stripping Volume and Groove Depth in Near Horizontal Surface Mine
    ZHAO Jun, SHANG Tao, LIU Ji-Peng, LIU Fu-Ming
    2012, 41(02):  54-56. 
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    According to the characteristics of the horizontal partition of surface mine，this paper analyzes the characteristics of total dumping covering，half dumping covering and whole groove of the inner dumping mode，and the formula of re-Stripping volume was obtained on the condition of total dumping covering and half dumping covering.With the basic principle of the surface mining，and according to the single and double circuit transportation distance of the inner dumping，a mathematical model with the optimized economic benefit was set up based on the groove depth，deducing the benefit formula of groove depth to maximize the economic benefits of inner dumping.Finally，the factors influencing to the groove depth are analyzed，obtaining that the inner dumping covering height in the horizontal surface mine the mining depth，the width of the pit bottom and the terminal slope angle would have a great influence to the groove depth.
    Stability Analysis of the Surrounding Rock of a Tunnel in Ai'pu Iron Mine
    MIAO Yu-Song, ZHANG Yi-Ping, ZUO Yu-Jun, YANG Yu-Rui
    2012, 41(02):  57-59. 
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    RMR is applied to analyze the rock stability，Pullman's theory is used to calculate the hardness of tunnel wall rocks，finally the phase2 finite element analysis is adopted to simulate the distribution of model stress.Combined with the results from the above three methods，the comprehensive evaluation on the stability of this tunnel of Aipu Iron Mine is obtained and some reasonable suggests to maintain the tunnel are proposed.The results show that the reasonable analysis and simulation on the stress of tunnel wall rocks can reflect the distribution of the wall rocks and provide an important role in predicting and assessing the tunnel's stability.
    Research of Superfine Low Grade Hematite by Coal-based Direct -Reduction-low Intensity Magnetic Separation
    ZHU De-Qing, DENG Xiu-Lan, CHUN Tie-Jun, PAN Jian, XIAO Yong-Zhong, RUAN Zhi-Yong
    2012, 41(02):  60-62+66. 
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    A hematite assay 27.2%Fe and most iron minerals occurr at 5 μm. Effects of various factors inducling reduction temperature，reduction time and grinding fineness on direct reduction-low intensity magnetic separation were discussed. The results show that iron ore concentrate assaying 75.71% Fe, metallization degree at 92.11% and iron recovery at 91.12% are obtained under the following conditions: the briquettes are reduced at 1 150 ℃ for 100 min (mass ratio of soft coal to briquettes is 2) and the reduced briquettes are separated at the grinding fineness of 90.22% less than 0.043 mm and field strength of 63.68 kA/m.
    Recovery of Iron from Gold Mine Tailings by Decentralized-Magnetization Roasting-Magnetic Separation
    CHEN Yan-Xin, YAO Yan-Fei, JIU Shao-Wu, ZHAO Bo
    2012, 41(02):  63-66. 
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    Decentralized magnetization roasting-magnetic separation was used to recover the iron resources of gold mine tailings with 27.26% Fe. Test was focused on the effect of roasting time, magnetic field intensity and the dosage of dispersant(hexametaphosphate) and flocculant(Oleic acid and kerosene) to concentrate grade and iron recovery. The experimental results indicate that after magnetization roasting under the conditions of 850 ℃, CO volume percentage is 2%, roasting time is 5 min, then proceed low intensity magnetic separation with Magnetic field intensity at 111.44 kA/m, the dosage of dispersant and flocculant is 2.50 kg/t and 5.64 kg/t, a concentrate assaying with 57.15% iron grade and 81.43% iron recovery could be achieved.
    Conversion Behavior of Minerals in the Coal-based Direct Reduction Process of the Siderite Ore
    YAN Shu-Fang, SUN Ti-Chang, XU Yan
    2012, 41(02):  67-72. 
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    In order to provide theoretical guidance for further research of coal-based direct reduction of siderite ore, a siderite ore from Jiayuguan was chosen for sample to study the conversion behavior of various minerals in the coal-based direct reduction process of the siderite ore, by the technologies of XRD, SEM, energy spectrum analysis and thermodynamics calculation. The results show that: with low consumption of coal, iron(magnesium) olivine is the first product in the process of solid reaction, then the excess iron minerals exist in the wutite form and forming iron core in some fu's body; iron particles are growing up with the coal consumption increasing, through the reduction of the wutite around the iron core to iron. In addition, along with the increasing of coal consumption, the main gangue iron magnesium olivine also convert into part of metallic iron through the procedure: iron magnesium olivine-iron peridot-wutite-iron.
    Producing Mn-Fe Alloy by Direct Reduction to Manganese Oxicle Ore
    ZHOU Chao-Yang, WU Guang-Liang
    2012, 41(02):  73-76. 
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    Producing Mn-Fe alloys with direct reduction to manganese oxicle ore has been researched. The effect of the basicity, carbon coefficient and additive on Fe-Mn alloy producing process were discussed and analysed. The results show that, the appropriate basicity is the important condition to separate the slag and metal, the carbon coefficient influences the metallic phase migrating and gathering, additive has a strong impact in reducing the melting point of slag and promoting the metal grain grow up together. The Fe-Mn alloy containing Mn71%, Fe17%, C7.0% is obtained in the condition that the temperature is 1 350 ℃and maintain 30 min, basicity is 2.0, carbon coefficient is 1.0, the amount of additive is 5% of total amount of CaO+Al2O3+SiO2+MgO slag.
    Experimental Research on Mineral Processing of Indonesh A Beach Iron Sandsfrom
    ZHANG Jun-Hui, ZHANG Yuan, YANG Yong-Tao, XU Ming
    2012, 41(02):  77-81. 
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    In order to provide a technical basis to explore the resources of iron sands from Indonesh for a domestic enterprise, beneficiation tests of grinding ore-low intensity magnetic separation test and flow sheet of pre-discarding tailings-classification-grinding ore-low intensity magnetic separation were carried out. Then, an iron concentrate with TiO2 grade of 9.32%, Fe grade and recovery of 55.31% and 87.29% was obtained in the former test, and an iron concentrate with TiO2 grade of 9.49%, Fe grade and recovery of 54.62% and 88.35% was obtained in the latter test. Contrasting the two beneficiation flow sheets, index of rail concentrates is similar,but the latter can reduce not only 37.73% of the grinding of the crude ore but also7.16% of the terminal magnetic separation of the crude ore, so it is taken as recommended beneficiation flow sheet.
    Results Comparison of Magnesite Reverse Flotation by Two Kinds Collectors
    WANG Qian-Qian, LI Xiao-An, WEI De-Zhou, ZHANG Si-Hui
    2012, 41(02):  82-85+120. 
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    Taking water glass or sodium hexametahposphate as an inhibitor, did the reverse flotation by cationic collector Wely to desiliconize the magnesite from Haicheng area Liaoning province, and compared the results with common used lauryl amine collector. The experiment results show that the suitable value of pH is 5； under the suitable dosage, these two kinds collectors combined with water glass or sodium hexametahposphate all can get the magnesite concentrate with MgO grade＞47%, SiO2 content＜0.2%，but the recovery rate of MgO with Wely which can get 77.15%~83.64% higher 2.15~4.06 percentage point than lauryl amine, Wely has the better selective collecting ability to silicate minerals；the dosage of water glass as inhibitor is 10 times than sodium hexametahposphate and the concentrate recovery rate is low, so sodium hexametahposphate is more suitable than water glass as the inhibitor to magnesite reverse flotation.
    Separation of Pentlandite and Chalcopyrite by Potential Adjustment and Collector-free Flotation
    CHEN Yong, SONG Yong-Sheng, LIU Shuang, ZHOU Cheng-Ying
    2012, 41(02):  86-88+98. 
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    In order to finding an effective way to separate pentlandite and chalcopyrite, the flotation behaviors of pentlandite and chalcopyrite potential adjustment without collector have been investigated.Results demonstrate that pentlandite and chalcopyrite will effective sparated just by frother when the pulp potential controled in the suitable range pulp.When pulp pH is 4.21, the approptate separation potenial range of synchronous flotatation is -550~-750 mV or 250~450 mV, and when pulp pH is 10.27, the approptate pulp potenial range of synchronous flotatation is -200~400 mV.
    Research Progress and Application Status on Cationic -Reverse Flotation Technology for Iron Ore
    QIU Ting-Sheng, ZHANG Wei-Xing, FANG Xi-Hui, ZHANG Bao-Hong
    2012, 41(02):  89-93. 
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    Comprehensively described the research progress on theoretical investigation of cationic collector, reagents and technology of cationic reverse flotation and introduced the industrial application status on cationic reverse flotation technology for iron ore in recent years. With the development of synthesis technology of cationic collector and cationic reverse flotation technology, the technology of cationic reverse flotation will be used to dispose domestic refractory iron ore more and more.
    Research Progress of Chalcopyrite Bioleaching Mechanism
    ZENG Wei-Min, QIU Guan-Zhou
    2012, 41(02):  94-98. 
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    It's necessary to solve the problem of low efficiency of chalcopyrite bioleaching by the bioleaching mechanism. Reviewed the development progress of bioleaching mechanism from “direct and indirect action” theory to “contact action” theory,then “indirect action-direct contact action-indirect contact action” theory and introduced the correlation model and explanation in detail. The chalcopyrite bioleaching mechanism isn't verdict and needs to continue thorough research.
    Discovery of Siliceous Rock Construction and its Metallogenic Characteristics in the Vicinity of Qiaerlong, Xinjiang
    HUANG Jian-Guo, YANG Rui-Dong, ZENG Lei, ZHU Cun-Jin, WEI Yu-Yan
    2012, 41(02):  99-101. 
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    According to the section of siliceous rock construction in Qiaerlong, Xinjiang, the paper analyzed the main rock, sedimentary environment, mineralization characteristics. It is considered that its paleogeographic environment is the neritic-bathyal basin, the silicon origins from the volcano source or the associated submarine exhalation. In the construction, the fine granodiorite porphyry intruded into deposit contains especially abundant Ag, Pb and Zn elements, which are enriched and mineralized in local zone. The research provides the prospecting direction for seeking polymetallic silver, lead and zinc deposit in this area.
    Inversion Calculation Method of Al1-time Apparent Resistivity with Transient Electromagnetic Based on Stochastic Resonance
    WANG Guo-Fu, WEI Qin-Ming, ZHANG Hai-Ru, ZHANG Chao-Fan, ZHANG Fa-Quan
    2012, 41(02):  102-104. 
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    Through investigating the characteristics of analytical iterative method for homogeneous half-space TEM, it is concluded that the “Runge” multiple solutions is in the same physical form with that generated by systems noise. Hence, the stochastic resonance algorithm was introduced to eliminate the “Runge” multiple solutions. The results showed that the proposed inversion method was effective in solving the multiple solutions in inversion calculation of iterative algorithm of TEM all-time apparent resistivity with high retrieval accuracy.
    The Research and Development of 3D Modeling System for Metal Mine Ore-body
    LIU Ya-Jing, LI Mei, WANG Zheng
    2012, 41(02):  105-107. 
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    The paper introduced the general design philosophy of the metal ore-body 3D modeling system, the characteristics of geological database, the design of table structure of geological database, and the main module functions in this system. The system well described various features on ore-body spatial extension under the three-dimensional conditions to indicate the ore grade distribution and the metallogenic rule and solve the reserves calculation problem. It provides an accurate, comprehensive and scientific basis for making decision for the design, production and management of mine.
    Views on Metal Mine Water Prevention and Control in South China from Makeng Iron Mine
    CHEN Yan-Mei, CHEN Zhi-Hua, KANG Cai-Qin
    2012, 41(02):  108-113+152. 
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    Hydrogeological and environmental problems，such as water inrush，depletion of groundwater resources，and karst subsidence，present in metal karst mine in south China.The principle of groundwater system is used to guide the mine water prevention and control，thus identifying the boundaries of karst water system，the internal structure and the relationship between system and environment.It can make hydrogeological work more directional and objective.New technologies and methods such as automatic monitoring of groundwater level，high-precision automatic tracer test，three-dimensional visualization of hydrogeological information management are adopted to identify such key hydrogeological problems as river seepage，karst water run-off channels.Hence，lots of labors，physical resources，and funds investments can be saved.
    The Construction of Double 3D Digital Mine Simulation Information System
    YU Ping-Ping, CHEN Jian-Ping, YU Miao, MA He-Qing
    2012, 41(02):  114-120. 
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    This paper studied the quick 3D modeling method of large complex geological mining engineering under the true 3D ground and underground environment，the realization method of scene wandering and simulation system，and proposed a set of effective true three-dimensional digital integrated solution for large-scale mine.Taking Gejiu Tin Mine of Yunnan province as an example，this paper studied the total design and the technical solutions of specific implementation of digital mine simulation information system，realized the true 3D ground and underground integration，the unified management and analysis of two-dimensional geological data and 3D geological model，phased integration of the mining segment of “partition type” digital ore fields.Also，it can carry on the interactive operation through the network，is a one-stop comprehensive service platform of multi-purpose，multi-level and multi-stage with combination of production，learn and research.These are of important significance to development construction，resources exploration and evaluation，comprehensive informatization management of a mine and mine-related knowledge popularization to the public.
    Application of Visual Identification in Transportation of Metal Mines
    YAO Hui-Lin, ZHANG Song-Lan, E Yi-Shuai
    2012, 41(02):  121-123+131. 
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    In case that the mine monitoring system with function of visual recognition does not require human intervention，the computer vision analysis method is utilized to make automatic analysis on the image sequences of camera recording and to achieve the positioning，identification and monitoring of dynamic scenes.On this basis，the targets are analyzed and judged，which can both monitor the daily transportation and treat the emergencies in time.It can meet the requirement of the social development today.
    The Modeling and Optimization of Underground Monorail Transportation System in Metal Mine
    XIE Xin-Ying, WEI Jing-Tao, ZHANG Xiao-Hai
    2012, 41(02):  124-126. 
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    In order to improve carriage efficiency of shaft locomotive, the model of underground monorail transportation system was build with the target to increase the average speed of all locomotives, and the advanced genetic algorithm is proposed for obtaining the optimal combination of the locomotive running. The advanced genetic algorithm could avoid the premature convergence of the traditional genetic algorithm falling to the local extremum. The experiment results indicated that the efficiency of monorail transportation was greatly improved after optimization, and the ore-pass owned a full capacity to satisfy the requirement of locomotive transportation, without locomotive waiting for loading ore under normal circumstances.
    Industrial Test of T-GCTS Magnetic Separator Used in Midi Concentrator
    WANG Xiao-Feng, LIU Bing, YANG Shu-Chun, LI Chang-Sheng
    2012, 41(02):  127-131. 
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    In order to improve the dressing index and single unit handling capacity of roughing in Pangang Midi concentration plant, in case of the similar ore grade, compared the T-GCTS1230 medium magnetic field intensity magnetic separator with the using CTS1030 magnetic separator of industrial test in single series. The results show that the concentrate grade of test series increased by 1.11%, the tailing grade reduced in 0.54%, the recovery of roughing choose increased by 0.92% and the single unit handling capacity can meet the requirement of 130 t/h. According to the test results, T-GCTS1230 medium magnetic field intensity magnetic separator has been used in Midi concentration plant of 16 series. It is estimated that the economic effectiveness is 1.077 million yuan per year.
    Finite Element Analysis of Vibrating Screen Main Parameters Affecting on Screening Efficiency
    SHI Xiu-Dong, ZHAO Wei-Wei, ZHAO Jia-Yang, XUE Bing-Cai
    2012, 41(02):  132-134. 
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    Based on the YD2000 vibrating screen, used orthogonal test to finite element numerical simulate the actual work of vibrating screen under different working parameters assembly. By contrast research simulated the scanning area and shape of motion trajectory of screen frame. The results show that the best screening efficiency will be obtained under the excitation force 38 kN, support spring stiffness 18.67 kg/mm, exciting force direction and the horizontal angle of 20° and support spring angle into 60°. Use these parameters to reform the YD2000 vibrating screen  which can improve the treatment capacity 21%.
    Correcting Block Structural Optimization Based on Computational Fluid Dynamics
    WANG Guang-Lei, REN Hong, LI Wen-Fei, CHEN Xin-Yong
    2012, 41(02):  135-137. 
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    In the air reverse circulation drilling system，there is a positioning device also called correcting block between the inner tube and the outer tube of the double wall.The current correcting rectangular block usually lead to greater loss on the circulatory system pressure，so the structure of correcting block is optimized with the help of computational fluid dynamics.Researches on block structure of double-wall drill annular gap are carried out，and the square，triangle，trapezoid，and hexagon correcting block are designed.Using pressure changes as the evaluation criteria，the numerical simulation on pressure field of correcting block is made with computational fluid dynamics software.Finally，the hexagonal correcting block is chosen.Then the three-dimensional numerical simulation on the pressure field of hexagonal block is made.It is further verified that hexagonal blocks can reduce the local pressure loss.Compared to the characters of other several correcting blocks，it owns a superior structure.
    Analysis of Influencing Factors on the Safe and Efficient Mining of Ore-body under Riverbed and Goaf Areas
    JIE Lian-Ku, CAO Hui, XU Wen-Yuan, YANG Xiao-Cong
    2012, 41(02):  138-140+148. 
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    Based on a comprehensive analysis of complex hydro-geological conditions in Nanminghe Iron Mine，the scattered distribution of the mined-out area and the special spatial relationship between Nanminghe Iron Mine and Wannian Mine，a comprehensive safety evaluation on Nanminghe Mine and the downstream Wannian Mine during mining process of Nanminghe Iron Mine is made through the stability characteristics analysis of rock and the factors affecting mining safety.Then，a reasonable advice for safety mining of Nanminghe Iron Mine is proposed，thus providing a basis for the design of a safe and efficient mining scheme.
    Calculation Method and 3D Visualization of Fire-oriented Ventilation Network Calculation
    CAO Zhi-Guo, LI Zhong-Xue, LI Cui-Ping, LIU Feng-Zhi
    2012, 41(02):  141-143. 
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    As a previous work of underground mine fire disaster simulation，how to establish calculation method and 3D visualization techniques of fire-oriented underground mine ventilation network plays an important role.As a result，a ventilation network graph model is established，and then a ventilation calculation based on H-Cross algorithm is constructed.In this paper，the calculation result can be saved in the database，which can increase user's call efficiency.Furthermore，3D visualization of ventilation network calculation is implemented by 3D visualization technique，which provides a basis for fire disaster simulation.At last，with an application in a typical underground metal mine，ventilation network calculation and 3D visualization is put into effect by Java and JOGL，which verifies that the technique is feasible and effective.
    Application of 30 m Ultra High Reinforced Earth Retaining Wall in Ninghua Xingluokeng Tungsten Mine
    HE Jian
    2012, 41(02):  144-148. 
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    The engineering process and deformation features of the construction and the retaining wall are described.Reinforced earth retaining walls are applicable to big and high walls as they are featured by strong adaptation to foundations，less land occupation and short construction period.The run-of-mine transport railway of Xingluokeng Tungsten Mine runs across deep valleys，for which reinforced earth retaining wall approach is selected after comparison with trestle option.In the design，class-II 30 m ultra high reinforced earth retaining wall is built as the road bed，which gives an annual accumulated maximum horizontal displacement of 16~83 mm and maximum sedimentation of 24~115 mm.The wall has been working well since its operation for 5 a.
    Experimental Research on the Performance of New-type High-performance Corrugated Filter Media
    LIU Li-Mei, CHEN Yi-Hua, HUANG He
    2012, 41(02):  149-152. 
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    The experimental research on the performance parameters of corrugated filter materials are carried out，including the dust-collection efficiency，dust-cleaning effect，running resistance and others.The results showed that the removal efficiency of new filtering media reached 99.8%，and，the dust collection efficiency reached 88% for 2μm dust.So，the corrugated filter media has a good dust-collecting performance.It still keeps stable for running resistance after several filtering due to its special surface treatment.The research indicates that this filtering media can better peel off dusts with a long service life.
    Recovery Test of Scheelite from A Mdybdenum Tailings by Floatathon in Henan
    LIAO De-Hua, CHEN Xiang
    2012, 41(02):  153-156. 
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    In order to recover the scheelite from molybdenum tailings, adopted the process of  pre-classification-+0.15 mm coarse fraction regrinding-one roughing one scavenging flotation desulfurization-one roughing one scavenging one cleaning flotation scheelite under normal temperature-one roughing three scavenging five cleaning heating flotation scheelite, got the tungsten concentrate with grade of WO3 at 60.14%, recovery of WO3 at 77.78%. Coarse fraction regrinding avoids the production of slime and over crushing of scheelite, adding the LY inhibitor can inhibit the gangue containing calcium. These measures ensure the test get better indexes.
    Reconceutration Study on the Tailings of Phosphorite in Guizhou
    LIU An-Rong, NIE Deng-Pan, ZHANG Qin, ZENG Cong-Jiang, GENG Jia-Rui, XUE An
    2012, 41(02):  157-158+165. 
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    According to the characteristics of the flotation tailings of phosphorite in Guizhou in which the main mineral is dolomite and fluorine apatite, reseparation research between dolomite and fluorine was done by the reverse flotation of one roughing and one cleaning after grinding. The results show that at these optimal conditions which are: 62.50%-75 μm grinding size, 14 kg/t phosphoric aid as inhibitor, 300 g/t AB as collector for roughing and 100 g/t for cleaning. The phosphorous concentrate with a content of P2O5 for 22.29%, MgO for 4.23% and recovery of P2O5 for 56.72%, and the magnesium concentrate with a content of P2O5 for 5.68%,MgO for 19.97% and recovery of MgO for 93.38% can be obtained. It provides an economic and feasible way for comprehensive utilization of the tailings.
    Study on Iron Recovery and Arsenic Removal to A Pyrite Cinder
    DONG Feng-Zhi, WANG Ping
    2012, 41(02):  159-161. 
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    The processing technology of the pyrite cinder from a chemical plant in Wuhan is that the iron recovered by low intensity magnetic separation and arsenic removed by chemical method. The conditions of low intensity magnetic separation include grinding fineness -0.038 mm 80%, magnetic field intensity 160 kA/m, under which the iron concentrate containing Fe 61.91%, S 0.682% and As 0.381% with the iron recovery 92.96% was obtained by one stage magnetic separation. The conditions of chemical leaching of iron concentrate by hydrochloride include pulp density 40%, ratio of hydrochloride and the solid(iron concentrate) 1∶25, the leaching time 40 min, the agitation intensity 300 r/min and washing 3 times after filtering waste acid, under which the iron concentrate assaying Fe 63.35%, S 0.325% and As 0.083% with the iron recovery 92.88% iron grade 63.35% can be achieved. How to ensure the effectiveness of arsenic removal while increasing the sulfur removal rate is need for further study.
    Development Issues Study on Lateritic Limonite in North Hainan Island
    ZHANG Jia-You, ZHOU Fang-Fang, FU Yang-Rong, YANG Yi
    2012, 41(02):  162-165. 
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    Basic characteristics of Hainan island northern lateritic limonite resources were summarized, the constraints issues of development and utilization of technology，mining land, environment and other factors were analyzed.Put forward to strengthen technology research on limonite ore beneficiation, try to rent a new model of land acquisition collected, combine of mining development to improve land remediation, improve mining the future of ecological restoration planning and other countermeasures and suggestions.