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Table of Content

    23 April 2012, Volume 41 Issue 04
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    Effects of Blasting Vibration on the Sijiaying Open-pit Slope
    WANG Xian, ZHANG Shu-Wei
    2012, 41(04):  1-4. 
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    Intense vibration induced by deep-hole blasting in stope has a great effect on the stability of the open-pit slope. In order to reduce the negative effects of blasting vibration, it must take the necessary measures and pay enough attention to the stability of open-pit slope in opencast blasting. Research on the blasting earthquake theory, the stability of Sijiaying mining area open-pit slope has analyzed. Meanwhile, it references some blasting vibration of drop earthquake experience at home and abroad, Sijiaying mining area blasting drop earthquake of method has summary and exploration. It takes interval loaded drug, slag blasting, delay blasting, and other blasting drop vibration measures. Combined with Sijiaying mining area site situation, it gives future improved way of depress blasting earthquake.
    Study on the Stope Structure Parameters of Non-pillar Sublevel Caving Mining Method in Jianshan Iron Mine
    HUANG Xing-Yi
    2012, 41(04):  5-7. 
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    According to the comprehensive study on the formula of drawing theory and indoor drawing test, the reasonable stope structure parameters of non-pillar sublevel caving mining method in Jianshan Iron Mine were obtained. It guarantees the production of mine, and reduces the loss and dilution index. Meanwhile, it provides the proof for preliminary design and construction. 
    The Pre-split Blast's Gap Form and Parameters Calculation
    YUAN Kang
    2012, 41(04):  8-11. 
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    During certain times, pre-stress that pre-blast hole produced to neighboring hole can control form of original crack in the fixed point and fixed direction, and it can consider blasted medium as uniformity of continuity and discontinuity body. Pre-split gap formed principle is researched using blasting mechanics and fracture mechanics. And the main parameters of pre-split blast's calculation formula are derived.
    Numerical Simulation on Large-diameter Bunch Deephole Blasting in Dongguashan Copper Mine
    YAO Dao-Chun, WANG Ling-Hui
    2012, 41(04):  12-15+53. 
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    Take the Large-diameter Bunch Deephole Blasting in Dongguashan Copper Mine as an example, different explosive lengths in each hole were simulated. The results show that shock pressure increasing rapidly and the shock wave propagates outside in the form of cylindrical wave at the very beginning of blasting. The blasting load acting on rock in the smash district reach a high value in a short time after the initiation, which leads to the drastic failure of compression. The comparison with the results from parallel long-hole blasting simulation shows that bunch deephole blasting technique will make a much higher maximum stress whose happening time is earlier.  So with the same charge weight, blasting effect of the large-diameter bunch deephole blasting will be better.
    Stability Analysis on the Mining of Hanging-wall Ore in Cangshang Gold Mine Based on FLAC3D
    HUANG Ping, YANG Peng, CUI Ming, LIANG Nai-Yue
    2012, 41(04):  16-18+35. 
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    The mining process of -170 m middle section was simulated by FLAC3D, and it calculated the stress and strain of the ore pillars and roof, and the subsidence of open slope. In the process of simulation, the stability of the ore block was analyzed by tailing after the displacement of roof midpoint and the max unbalance force. The numerical results show that the displacement of the ore midpoint is in allowing range and the max unbalance force ultimately tends to 0, which verifies that the method of drift cut-and-fill stoping is safe and the best mining sequence is determined. It brings a simple and efficient technical support to recover hanging-wall ore safely on complicated geological condition, while protecting the village and farmland.
    Effect of Geological Discontinuities on Slope Blasting and Improving Measures
    PU Chuan-Jin, XIAO Ding-Jun
    2012, 41(04):  19-22. 
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    Smoothing blasting effect on slope of discontinuities up-righting to level, bedded slope and anti-dip slope was analyzed. It easily formed zig-zag slope after blasting of slope of discontinuities up-righting to level, and blasting effect is improved through more borehole and much less charge. It easily formed landslide after bedded slope blasting, and breakage effect of the reserved slope rock is depressed through reinforcement slope in pre-blasting and smoothing blasting of air-space charging. It easily formed over-excavation after blasting of anti-dip slope, and blasting effect is improved through depressing slope angle and blasting of air-space charging. For improving the slope blasting effect, it has some reference values.
    Study on the Engineering Mechanics Characteristic of Anchorage Agent Bolt and its Application
    JIANG Jun-Wen, CHEN Qing-Yun, YANG Cong-Bing, ZHONG Jian
    2012, 41(04):  23-26. 
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    Based on the measured pulling force/deformation of anchorage agent bolt, the step function is obtained by fit its mechanics characteristic curve. The pulling force of the anchorage agent bolt approaches average maximum value after supporting ten days, and the deforming capacity increases first, and then decreases over time. According to the measured mechanics characteristic curves of the anchorage agent bolt and typical tunnel deformation characteristic curves, the safety factor method is presented to evaluate the effect of tunnel supporting design, which provides an important basis for optimal design.
    The Reliability Analysis of New High-moisture-material Backfilling System
    WANG Peng-Yu, FENG Guang-Ming, QI Yang, JIA Kai-Jun, ZHAO Jian-Guo
    2012, 41(04):  27-31. 
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    It was proved that the new-high-moisture-material is perfect packing material beside roadway because of its early strength，easy pump-ability，good goaf-tightness，etc. Due to various reasons，the new high-moisture-material backfilling system sometimes goes wrong. Its fault decreases the backfilling efficiency. Based on the actual failure data of Qiuji mine backfilling system，research and analyze the reliability of the backfilling system by using the fault tree analysis(FTA).The results show that the reliability of the system is 0.9235,and it can maintain the production requirement. Preventing mis-operation and regularly maintaining the equipment are the effective ways of improving the reliability of the system.
    Technology of Compound Soft Rock Supporting for Deep Shaft Ingate in Zhaogu No.2 Coal Mine
    XU Yu, CHEN Xin-Ming, JIAO Hua-Zhe
    2012, 41(04):  32-35. 
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    The failed section of the auxiliary vertical shaft ingate in Zhaogu No.2 coal mine was very deep. Surrounding rock mass were high stressed, swelling and jointed compound soft rock. In order to repair the failed ingate, according to the geological conditions and failed conditions, the deformation failure mechanism was analysis. The repair and control plan were set up, and the failed section of the ingate was successfully repaired and controlled. Composite support structure means of the anchor (cable) spray +retractable steel U bracket + secondary support of stone and concrete reinforced concrete + full-face bolting reinforcement + corner anchor beam under complicated geological condition are obtained. The supporting scheme was established and numerical simulation by FLAC3D, and the analysis results show that the supporting scheme is rational.
    Numerical Simulation on Deformation Distribution and Stress Distribution of Deep Surrounding Rock Mass
    LIU Wei, ZHANG Rui-Chong, YANG Rui-Xia
    2012, 41(04):  36-39. 
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    With exploitation of the deep ore body, the frequency of roof collapse and rib fall ascends. In order to solve this problem, the excavation process of the deep mine was simulated using FLAC3D. The stress field and displacement field were analyzed. The numerical results show that the horizon displacement is resulted by the vertical stress, and the vertical displacement is resulted by the horizon stress. It provides theory basis for the tunnel supporting design.
    Effect of Weak Interlayer on Slope Stability of Open-pit Mine
    DING Li-Ming, CAI Qing-Xiang, LIU Lei, MA Li, ZHOU Wei
    2012, 41(04):  40-42+58. 
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    Weak interlayer or weak structural surface will cause creep deformation and damage because they exist in the open pit, and this will threaten the open-pit slope stability. The destruction of the slope with the form of soft interlayer through its failure mechanism was discussed. According to the studies of mining case, the model of open-pit slope with the weak interlayer was established using ANSYS software. Through the analysis of effective data and the observation of test results，it can determine its stability. The weak interlayer has a great influence on slope stability.
    Roughness and Stiffness Analysis on Grouting Structural Surface of Fractured Rock
    HAN Gui-Lei
    2012, 41(04):  43-46. 
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    Structure surface is an important factor in controlling rock property. In order to improve the rock properties of physical and mechanical, grouting technique is often applied in engineering. The structure surface of JRC-JCS model was studied. Based on it, comparison study was carried out before and after grouting of the rock structure on the surface. Studies show that JRC of surface structure greater increase than natural after the end of grouting. While the growth trend changes with the change of normal stress. After grouting the stiffness and shear strength of structure surface is improved, and the stiffness improvement is more apparent. The research results further prove that strength of fractured rock increase after grouting
    Effect of Toe of Slope Disturbance on Global Stability of Working Slope
    ZHAO Hong-Bao
    2012, 41(04):  47-50. 
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    Take the working slope of Antaibao open-pit mine as an engineering background, the evolution law of global stability of surface mine working slope affected by toe of slope disturbance is simulated by FLAC3D. The results show that compressive stress of surface mine working slope after affected by toe of slope disturbance is showed gradually decreased on direction of X and Z, and tension stress zone appeared in local zone on direction of X; the effect of uniform toe of slope disturbance on global stability of working slope is showed nonlinear; the property of tensile strain is showed on direction of X in surface mine working slope, and tensile strain will increase as the increase of toe of slope disturbance; compressive strain is mainly on direction of Z, but tensile strain will appear in local zone of toe of slope on direction of Z, too . Slip deformation is most easily to occur in the tensile strain area of toe of slope.
    The Comprehensive Application of Mining Method for the Local and Thick Ore-body
    ZHANG Jin-Kai, ZHANG Ming
    2012, 41(04):  51-53. 
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    Bailingshan iron mine in Shanshan county，Xinjiang is gently inclined thin ore body and can be recovered with the shallow hole room-pillar mining method.When the large and thick ore-body appears in local places，it is difficult to recover the top ore-body.In order to solve contradiction between the scraping and stoping，this paper improved mining method，by intergrading room-pillar method and shallow hole shrinkage，which successfully resolve series of problems such as local ore bodies' stopping，stope safety，pedestrian，ventilation and transport so on.The loss rate and the dilution rate reach 11.58% and 5.1% respectively.It provides experiences for the similar ore body stoping.
    Improvement of Filling Mining Method in a Copper Mine
    XIE Hong-Pei
    2012, 41(04):  54-55+67. 
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    According to unstable roof, high grade and high value of difficult mining body, a copper mine in southern of Anhui improved the filling technology and optimized the mining technology parameter. The mining recovery rate improved from original of 75% to now of 95%, and support cost of mining stope also decreased from original of 25 Yuan/t to now of 22 Yuan/t. It has achieved good economic benefits.
    A Preliminary Discussion on the Merits and Demerits of the Cooling Modes of Emulsion Explosive Matrix
    XU Dong-Ping, LI Yong
    2012, 41(04):  56-58. 
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    The most common use and the most representative cooling modes in the emulsion matrix cooling process of emulsion explosive production in China have briefly been described, and the merits and demerits in each cooling mode have been analyzed. The belt emulsion explosive cooling machine which is in the optimum overall benefit and conforms to large scale continuous and self-controlled production line has finally been determined.
    Model of on Risk Analysis for Mine Construction Project under the Sustainable Development
    ZONG Zhi-Fang, LIAN Lan-Ying, YUAN Yang, LI Zhong-Nan
    2012, 41(04):  59-62+90. 
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    The impact factors of economic effects for mine construction project have become very complex under the sustainable development. Based on the risk element identification, risk analysis mode in economic evaluation for mine construction project by using risk element transmission principle was built. This mode could effectively analysis economic effects of the project in the influence of risks transmission. Thus it could offset the inadequate of risk analysis in economic evaluation for current projects, and provides some consultation for correct decision of coal construction project.
    Experimental Research on Water-Heating Sulphidizing Flotation Process of A Low-Grade Refractory Oxidized Copper Ore
    SONG Xiang-Yu
    2012, 41(04):  63-67. 
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    A low-grade oxidized copper ore, with high oxidation ratio and high combination ratio and serious weathering, can not effectively been separated by the conventional sulphidizing flotation process. Therefore, water-heating sulphidization flotation process was adopted to deal with the oxidized copper ore. That is S-2 by disproportionation reaction of sulfur in autoclave, will transform oxidized copper ore into copper sulfide, and then the product, copper sulfide minerals,were separated by the conventional flotation process. Experimental results indicate that the optimal conditions for water-heating sulphidizing process are determined as follows: reaction temperature 200 ℃，reaction time 180 min, particle size 90% -0.074 mm, vulcanizing agent dosage 1.4 times to the theoretical dosage, liquid-solid ratio was 1.4. Compared with the conventional sulphidizing flotation with Na2S, the grade and recovery rate of copper concentrate obtained in these conditions were 15.73% and 71.49%, and increased by 4.28 and 38.73 percentage points，respectively.
    Study on the New Flotation Technology for Cu-Pb-Zn Polymetallic Sulphide Ore in Qibaoshan
    LUO Xian-Ping, WANG Xiao-Lei, LUO Li-Ying, CHEN Xiao-Ming, 吕Ling-Zhi
    2012, 41(04):  68-73. 
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    In order to provide the basis for Cu-Pb-Zn polymetallic sulphide ore in Qibaoshan Jiangxi province further optimized renovation, the high-effective collector LP-01 was selected as Cu collector and LP-11 as Pb collector, which were self-developed by Jiangxi University of Science and Technology, and butyl xanthate for Zn, the mixed reagent of ZnSO4 and Na2SO3 as Pb and Zn depressor. A better separation index was obtained through the selective floatation test of Cu-Pb-Zn, Cu concentrate with Cu grade of 19.84% and recovery of 60.25%, Pb concentrate with Pb grade of 72.34% and recovery of 73.04% and Zn concentrate with Zn grade and recovery of 50.55% and 88.46% respectively. Each of Cu, Pb, Zn gets the successful recovery.
    New Process of Flotation Separation of Associated Mo-Cu-Bi Sulfide Ore of Xingluokeng Tungsten Ore
    LI Ai-Min
    2012, 41(04):  74-78+90. 
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    In order to optimize the effect of flotation separation for associated Mo-Cu-Bi sulfide ore of Xing Luokeng Tungsten ore, “Mo preferential flotation, Cu-Bi separation after bulk flotation for Mo tailings, recovering Bi by leaching Bi rough concentrate” technological process was adopted and a better experimental index was obtained. The results of closed-circuit test show that Mo concentrate with Mo grade of 45.37% and recovery of 90.46%; Cu concentrate with Cu grade of 23.01% and recovery of 91.03%; Bi concentrate with Bi grade of 62.37% and recovery of 60.09% are obtained. In Comparison with the original process, the recovery of Mo, Cu and Bi is respectively improved above 4 precentate points, 8 precentate points and 52 precentate points.
    Oxidation Pretreatment Tests of A Refractory Gold Concentrate
    HONG Zheng-Xiu, YIN Wan-Zhong, MA Ying-Qiang, JIN Chuang-Shi, SUN Hong-Shuo
    2012, 41(04):  79-82. 
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    A gold concentrate is very difficult to be cyanide leached out because of the fine disseminated grain size and wrapped by sulfide of gold mineral. So taking the hydrogen peroxide as oxidizer, carried out the oxidation pretreatment to the gold concentrate and determined the suitable conditions: grinding fineness at -48 μm 90%, pulp density at 40 g/L, stirring speed at 200 r/min, reaction temperature at 50 ℃, dosage of sulphuric acid at 0.7 mol/L, dosage of hydrogen peroxide at 0.3 mol/L, reaction time at 8 h. After oxidation pretreatment to gold concentrate, the leaching rate of cyanide leached gold increases from 51.6% to 78.3%.
    Reverse Flotation Research on Phosphate Ore Containing Rare Earth from Zhijin
    LIU An-Rong, NIE Deng-Pan, ZHAO Wei-Yi, WU Su-Bin, HE Hao, ZHAO Li-Jun
    2012, 41(04):  83-85. 
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    According to the property of the mineral, the phosphate ore containing rare earth from Zhijin, some researches were done by the reverse flotation of one roughing and one cleaning using home made collector AB which is aim at gangue like dolomite. The results show that at these optimal conditions of 82.83% -0.075 mm grinding size, 350 g/t and 100 g/t AB as collector each in roughing and cleaning, 12 kg/t and 2 kg/t phosphoric aid as depressor each in roughing and cleaning, a phosphorous concentrate with the grade of P2O5 for 31.20%, content of MgO for 1.07%, RE2O3 for 0.133% and recovery rate of P2O5 for 84.62%, RE2O3 for 92.98% can be obtained. It provides a economic and feasible way for comprehensive utilization of this kind of phosphate and its associated rare earth.
    Separation Tests of a Low-grade kyanite Ore from Shuyang
    LU Yang, GAO Hui-Min, WANG Fang, HONG Li, ZHANG Ling-Yan, GUAN Jun-Fang
    2012, 41(04):  86-90. 
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    Aiming at a low-grade kyanite ore from Shuyang, under the basement of conditions tests, compared the effect of two kinds flowsheet as grinding-desliming-high gradient magnetic separation then acid flotation and grinding-desliming-acid flotation then high gradient magnetic separation. Finally determined to adopt the flowsheet of grinding-desliming-high gradient magnetic separation then acid flotation, got the kyanite concentrate with Al2O3 grade of 55.46% and the recovery of 81.24%. It can provide a technical basis for the developing of the kyanite resource.
    Influencing Factors of Calcified Roasting and Thermal Analysis to the Process of Vanadium Slag Produced from Pangang
    YIN Dan-Feng, PENG Yi, SUN Chao-Hui, HE Wen-Yi
    2012, 41(04):  91-94. 
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    Carried out the calcified roasting test to vanadium slag from pangang, investigated the influencing factors to roasting effect including the vanadium slag granularity, ratio of calcium to vanadium, roasting temperature, roasting time, and thermal analysis to the roasting process. The results show that: under the conditions of the granularity of vanadium slag at -140 mesh, the ratio of calcium to vanadium at 0.62, roasting temperature at 900 ℃,roasting for 150 min, the effect of calcified roasting is better, and the leaching rate of vanadium can reach to above 91%; the process of calcified roasting is oxygenolysis of vanadium slag first, and then direction action with calcium carbonate at 680 ℃ to produce Ca-containing vanadates.
    Resources Characteristics and Market Situation of Bentonites at Home and Abroad
    PENG Yang-Wei, SUN Yan
    2012, 41(04):  95-99+105. 
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    Detaily sum up the the features of composition and texture, types of deposit and ore and distribution of resources of bentonites. Then, introduce the utilization of bentonites as well as characteristics, discuss the current situation and development directions of the domestic and overseas market of bentonites. Finally, some suggestions are given about the development and utilization of bentonites resources in China.
    Research Progress of Ion Flotation Technology
    LI Xiao-Bo, YAN Wei-Ping
    2012, 41(04):  100-105. 
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    Introduce the theoretical research progress of ion flotation on reagent action mechanism and flotation dynamics, and also describe the research situation in the flied of mineral processing, hydrometallurgy, wastewater treatment and chemical industry and so on. Summarize the influence factors and technological characteristics of ion flotation, and prospect its development and application process.
    Research of Geochemical Data Processing Based on Fuzzy C-means
    MENG Hai-Dong, GUAN Shi-Ming, XU Guan-Dong
    2012, 41(04):  106-108+143. 
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    Combination characteristics of geochemical elements in the known gold ore field and tin ore field are analyzed by means of C-means which takes the geochemical elements as data objects and the sample analysis results as attribute values. The results indicate that C-means clustering algorithm can discover the combination characteristics of geochemical elements objectively and effectively in the given ore fields. At the same time, the combination characteristics of geochemical elements in a geochemical sampling area which is located in a polymetallic metallogenic belt is analyzed. Based on the analyzing result we can deduce that the geochemical sampling area is a target region which is related with gold, silver and polymetallic resources. 
    Study on the Existence of Blind Porphyry Ore-body in Nuri Ore District, Tibet
    WANG Li-Qiang, TANG Ju-Xing, LUO Mao-Cheng, CHEN Wei, WANG Huan
    2012, 41(04):  109-113. 
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    Based on detailed geologic observation and core logging, develop some comparative study for Nuri and other porphyry ore deposits (Jiama deposit, Qulong deposit, Bangpu deposit and Sharang deposit) on the features of hornfels, fractures and veins in hornfels and the features of mineralization and so on. Combing previous research results of diagenetic and metallogenic epoch of this ore deposit, the blind porphyry ore-body is existing deep in the Nuri ore district. Put forward some suggestions on the next work of prospecting and exploration and arrange the deep drilling in the area of prospecting line 37 to prospecting line 41 is supposed to hit the blind porphyry ore-bodies by analyzing the distribution of hornfels, thickness variation of hornfels and the development degree and attitude variance of the fractures and veins in the ore district.
    Hyperspectral Remote Sensing Image Dimensionality Reduction by Kernel PCA Method Based on NystrÖm Algorithm
    CAO Qian, TAN Kun, DU Pei-Jun, XIA Jun-Shi
    2012, 41(04):  114-117. 
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    The paper employed a novel method based on NystrÖm algorithm to realize dimensionality reduction of hyperspectral remote sensing image. First, part of the samples was extracted randomly to form sub kernel matrix whose eigenvectors were computed. Then the process above was iterated to compute the new kernel and update the eigenvectors. Finally the image after dimensionality reduction was produced with the last eigenvectors. This method was prepared with KPCA in time consumption, the quantity of extraction feature information and classification effect with datasets OMIS and ROSIS employed. Experimental results show that with contrast to KPCA, SKPCA (Simplified KPCA) had comparative performance in feature extraction and classification effects but apparently higher computing speed.
    Application Outlook of Wireless Mesh Networks in Open-pit Communication System
    HE Lin, LI Ke-Min
    2012, 41(04):  118-120+167. 
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    In order to improve the productive efficiency precision management level, the modern open-pit mine has higher requirements for data communication system, so the traditional wireless communication system can not meet the needs of open-pit mine production. With the characteristics of high capability, fast data rate, wide coverage, low costs, multi function, network self-organization and so on, the communication system based on Wireless Mesh Networks has clear superiority compared to traditional wireless networks. The performance contrast analysis between Wireless Mesh Networks and Wireless Local Area Networks（WLAN） shows that the communication system based on Wireless Mesh Networks has broad applications in open-pit mine.
    Visualization System Based on IDL in Mine Cavity
    ZHANG Hai-Long, WANG Wei-Lin, LI Li, ZHOU Dao-Lin
    2012, 41(04):  121-123. 
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    By means of the advanced CMS probing, it can accurately obtain data of the cavity, read data of cavity's visualization model by IDL (Interactive Data Language), establish the visualization system of the mine cavity, which is an important basic work of backstopping of mine resource, verifying of mine reserves, dynamic management of mine reserves and disaster prevention of the cavity by accurately hold of 3D dimensional shape of cavity, location in ore body, practical boundary, mining the size of the volume and surface.
    Simulation Technology of Mine Vehicle Position Based on MapX
    MI Hong-Jun, LU Cai-Wu, FENG Zhi-Dong
    2012, 41(04):  124-127. 
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    GIS/GPS/GPRS-based vehicle monitoring system is an integrated application system with GIS as based information system platform, GPS as vehicle Location means, GPRS as data transmission means. According to company status and the actual demand, GIS was deeply analysis, and a rational and efficient, modular, reusable, maintenance-friendly monitoring of the GIS components for the system was designed using C++ language and component of MapX5.0. The components of the rational application can greatly reduce development costs, facilitate the maintenance of the system, and improve the operating efficiency of the whole system.
    Programmable Logic Controller Power-driven Hydraulic Drill Jumbo
    FAN Xiang-Sheng, HU Zhi-Jun, WANG Peng-Cheng
    2012, 41(04):  128-130. 
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    The paper introduces a kind of programmable logic controller power-driven hydraulic drill jumbo， including its features，range of application，main technical specifications，working principle and composition.In addition，its main feature and control mode is analyzed，which demonstrates this product owns vast potential market prospect and good economic effectiveness.
    Research on Mechanism and Process of Tailing Dam Break due to Overtopping
    WEI Yong, XU Kai-Li
    2012, 41(04):  131-135. 
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    Accurately understanding the development process of tailings dam break due to overtopping is the basis for simulating the shape evolution and calculating the discharged tailing flow, which is to carry on the routing of tailing flow, risk analysis and developing emergency plans. Due to lack of accurate and complete instance data for dam-break, it is incomplete to understand development mechanism of dam-break, so it is impossible to accurately describe the development process of dam-break erosion and research on dam-break is still in semi-theoretical or semi-empirical status. Two basic theories to study the dam-surface erosion after overtopping and mechanism of dam break due to overtopping were used. Based on the research and analysis of the destruction process of earth-rock dam break due to overtopping and combined with tailing dam its own characteristics and related theories, the destruction process of tailing dam break due to overtopping was proposed.
    Monitoring Analysis of Well Area Deformation and Disposal Propose in Chengchao Iron Mine
    CHEN Wei-Wei, CHEN Cong-Xin, XIAO Guo-Feng
    2012, 41(04):  136-140. 
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    The surface cracks and wellbore cracking phenomenon have appeared successively in the area of the east and west air shaft well of Chengchao iron mine, and the surface cracks scope is also in the unceasing expansion. It has already threatened the safely of the east and west air wellbore structure. Based on the deformation monitor situation of the wellbore cracking and the surface fissures as well as the scene investigation, the mechanics mechanism of the wellbore structure and foundation deformation was studied. It analyses the causes which results in the surface deformation and the wellbore cracking in the east and west air shaft well area，and obtains the drainage of underground water and underground mining are the direct causes of the surface deformation and the ground subsidence phenomenon, moreover the engineering geology structure and the hydro-geological conditions in the mining area also have influence to the surface deformation characteristic, and some corresponding measures to slow down the surface deformation in the wellbore areas is proposed.
    Study on Shaft Deformation Forecast and the Protective Measures
    LI Ying-Wei, ZHOU Hua-Qiang, CHANG Qing-Liang, CHEN Jian-Xing
    2012, 41(04):  141-143. 
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    In this paper, aiming at the mining of the portal and industrial area pillars, the author decided to adopt the paste backfilling with slicing descending mining method and figured out that the allowable subsiding ratio is 0.15. Based on this mining method, the portal deformation prediction was conducted. As a consequence, the conclusion was that the portal would subside and the stretching deformation could become greater with the working face advancing towards the portal. What's more, the portal deformation would become stable when the working face was approximately 50m in the front of the portal. Addition to that, protecting measures were chosen on the basis of the predicting results.
    Stability Analysis on the Mined-out Areas Using 3DEC
    LI Chang-Hong, CHENG Yan
    2012, 41(04):  144-147+159. 
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    Stability conditions around mined-out areas that exist in an underground mine have a great influence on the safety, production and economic performance of the mine. The effect of mined-out areas and a natural cavity on the deformation, stress, failure zone and stability around the mined-out areas and the cavity located in a metal mine mass at the three-dimensional (3D) level were studied. The information available on stratigraphy, geological structures, mined-out areas, a natural cavity, in-situ stress measurements and geo-mechanical properties of intact rock and discontinuity interfaces have been used to build a 3D numerical model using 3DEC. The stress and deformation conditions around the mined-out areas and the cavity in the metal mine rock mass were simulated. Finite size discontinuities and fairly complex 3D geology have been simulated. 3D stress analyses have been conducted under several possible material property values to study the effect of material properties on the deformation, failure zones and stability. The results show the areas which can have tensile or shear failures and also high deformations. On the basis of measured with the AGI, 3DEC numerical simulation is used, by the comparison predicting the results with the actual settlement conditions, applicability of 3DEC system in the mining subsidence prediction has been verification, it proves that mining subsidence can be better reflected the actual situation.
    Treatment of Simulated Radioactive Waste Water Containing Cs+ with Clinoptilotite
    LIU Ai-Ping, LIU Sui-Hai, WANG Hui
    2012, 41(04):  148-151. 
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    Taking clinoptilotite in Xinjiang as adsorbent, carried out the adsorption and desorption tests to the simulated radioactive waste water containing Cs+ prepared by CsNO3, then discussed the isothermal absorption model and desorption dynamic behavior. The results show:clinoptilolite on removal rate of clinoptilolite to Cs+ reaches equilibrium after 16 h, the saturated dosage adsorption is at 196.99 mg/g, the isothermal absorption model is Langmuir moel; under the dosage of Clinoptilotite at 10 g/L, in order to insure the removal rate of Cs+ above 97%, the concentration of Cs+ in water must be less than 664.55 mg/L; the desorption dynamic behavior of clinoptilotite to Cs+ is suit to the description of index model, and it will take 99 d to fully desorb the saturated adsorption Cs+ in theoretically which proves the solid ability of clinoptilotite to Cs+.
    Hazards of Fluoride Pollution and Technical Research Progress of Treating Fluoride-containing Wastewater
    LEI Shao-Min, GUO Zhen-Hua
    2012, 41(04):  152-155+159. 
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    Conclude the fluoride pollution sources, introduce the hazards of fluoride pollution, discuss the fluoride-containing wastewater treatment technical research progress, and analyze the existing problems of fluoride-containing wastewater treatment methods, finally point out that the new functional materials, combination process and resource utilization technology are the key orientation of fluoride-containing wastewater treatment research.
    Recovering Silver from Zinc Leaching Residue with Carrier Flotation
    GE Ying-Yong, SHI Mei-Jia, ZENG Li-Ming
    2012, 41(04):  156-159. 
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    In order to recover silver from zinc leaching residue which produced by a zinc hydrometallurgy factory in Inner Mongolia, did some tests with flotation method. The results show that, because of the fine disseminated silver mineral in zinc leaching residue, the recovery rate is low with conventional flotation but can be remarkably better by carrier flotation. Taking -0.037 mm organic matter AC-0 as carrier, lime for pH adjustment agent, odium sulfide as activating agent, ammonium dibuyldithiophosphate and isopropyl ethylthionocarbamate as collectors, finally get the grade of 8 670 g/t silver concentrate with the recovery rate of 61.67% through the closed circuit test of one roughing, one cleaning, and one scavenging system.
    Flotation Recovery of Copper from A Slag of Copper-smelting Converter
    GAO Qi-Peng
    2012, 41(04):  160-162. 
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    Slag of copper-smelting converter from a copper smelting works contains copper grade 4.60%, which is a kind of secondary resources with high economical value. Carried out the test of recovering copper from slag of copper-smelting converter, taking thionocarbamate as collector, in condition of grinding fineness at -0.075 mm 90%, after one roughing, three cleaning and two scavenging flotation process, got the copper concentrate grade of 32.46% and recovery of 89.75%. These provide technical reference for recovering copper from the slag of copper-smelting converter.
    Research Progress of Recycling Molybdenum from Waste Catalyst
    WANG Ren-Qi, DAI Tie-Jun
    2012, 41(04):  163-167. 
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    Introduce three kinds of domestic main way of recycling molybdenum from the waste catalyst, namely the method of using pyrogenic process, wet process（including water extraction, acid leaching, alkaline leaching and composite leaching），and also direct utilization process. Analyze the advantages and disadvantages of these methods and lastly point out the future research should develop new techniques of low cost, low pollution, low energy consumption and strengthen comprehensive recovery of other beneficial elements in the waste catalyst.