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    15 October 2012, Volume 41 Issue 10
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    The GFRP Bolt Support Test in Jinshandian Iron Mine and the Existing Problem
    WANG Wen-Jie, MA Xiong-Zhong, ZOU Chang-Fu, MA Sheng-Hui
    2012, 41(10):  1-4+8. 
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    The ore and rock mass of Jinshandian Iron Mine is very cracked，the metal bolts supported failure is serious because of corrosion，So the problem of development working failure is serious. Because of the good characteristics of glass fiber reinforced polymer (GFRP) anchor，the paper study of using GFRP bolt supporting to replace screw-thread steel bolt supporting. The paper analyzed the supporting effect of screw thread steel anchor and GFRP anchor under the mining condition based on numerical analysis. The numerical analysis show that using GFRP anchor supporting can effectively change the neutral point position，and can improve the stress distribution characteristics of cable grout，thereby the bolt capacity of resistance to tunnel deformation is improved. Based on the GFRP bolt supporting industrial test and monitoring，the paper analysis the testing tunnels convergence deformation and discusses the GFRP bolt supporting problems in Jinshandian Iron Mine. Experiments show that using GFRP bolt or screw thread steel anchor supporting can achieve the same effect in controlling the deformation of tunnel，but the tail of GFRP bolt destroyed easily under blasting shock effect，and the nut easily shedding under the large tunnel deformation effect. So the GFRP bolt can not continue to provide effective extrusion pressure and the metal net fall off until the entire bolt failure.
    Research on Refractory Ore-body Recovery in Shifengshan Copper Mine
    QING Li, ZHANG Yong, MA Shi-Xiang, LI Xian-Zhou
    2012, 41(10):  5-8. 
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    Based on 71# ore-body in 940~965 m level in Shifengshan Copper Mine，the sub-level stoping method with sill pillars was adopted for the gently inclined to inclined and medium thick ore-body through the related analysis and feasibility demonstration. The sub-level mining of difficult-to-mine ore-body was carried out under the premise of the sill pillars structure remaining unchanged. The stope structure parameters were optimized according to the mining conditions and the occurrence of the ore-body. The test research results indicated that the ore dilution was decreased，the stope production capacity was increased，the processing grade was improved，the mining operation cost was reduced，and so that the mine resources were made full use of.
    The Safety Evaluation and Treatment of the Excavation of an Open-pit Mine
    QU Chun-Lai, ZHANG De-Zheng, YI Ying
    2012, 41(10):  9-10+14. 
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    Taken a rock slope of an open-pit mine as an project background, the stress evolution and the law of deformation on the excavation direction of rock slope during the excavation process was simulated by FLAC3D. The result shows that the stability of hanging slope in the mining is poorer, each step of rock mass excavation are destructive disturbance. It is likely that the destruction along the steps occurs and the overall stability loses, putting forward the programs of cutting slope and reducing load slope, and using the limit equilibrium method to analysis of slope stability after management to ensure the safety of open-pit mine production.
    Study on Movement and Destruction Response Characteristics of Goaf Roof Rock under the Complex Environment
    JIANG Wen-Wu, ZHANG Yao-Ping, LU Zhi-Gang, LI Guo-Jian
    2012, 41(10):  11-14. 
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    For safety mining orebody under the complex environment of tectonic stress and river plate, according to mine design framework, the site monitoring and numerical method were used to study movement and destruction response characteristics of goaf roof rock, which is filled in the ways of dry stowing and gray sand ratio 1∶4 cementation. The results show that comparing the effectiveness of controlling the goaf roof rock to move and destroy with the gray sand ratio 1∶4 cemented filling mining process, the damage characteristic values that are caused by dry-fill mining process, such as sinking deformation value, principal stress difference, plastic zone and so on are significantly larger, and the goaf roof rock suffered shear failure many times, the fracture zones run through the river plate, so it can't ensure the mine produce safely and successfully.
    Optimization of Open-pit Mining Limit of Tongling Xinqiao Deposit based on Surpac
    CUI Can, YUAN Feng, LI Xiao-Hui, ZHANG Ming-Ming, JIA Cai, ZHOU Tao-Fa
    2012, 41(10):  15-18. 
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    Adopting the SURPAC 3D geological mining software，combining with the actual demands of Tongling Xinqiao Deposit，and based on the 3D digital mine model，the optimization of open-pit mining limit is made by the mathematical logic algorithms of L-G method. The results provide a data basis for increasing the economical benefits，and propose a rational recommendation for the more reasonable mining production in Xinqiao Deposit.
    Series-parallel Model for Forecasting Permeability of Fractured Rock Mass
    LIANG Hao-Nan, LIU Wei-Qun, SONG Liang
    2012, 41(10):  19-24. 
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    A new concept，single fracture intrinsic permeability，was put forward through transforming cubic law expression. Then the equivalent intrinsic permeability of the series fractures and the parallel fractures was respectively discussed. The series-parallel model for forecasting permeability of fractured rock mass was presented based on the series-parallel relationship between fractures.  And，firstly，the concept of intrinsic permeability of fractured rock mass was put forward. In the paper，the series-parallel model and UDEC were respectively used to analyze a simple fracture network and the results were the same. The two theories are inversed in analyzing problems. However，the equivalent intrinsic permeability of fracture rock mass proposed by the series-parallel model can make it easier in practical application. The theory in the paper is also the basis for forecasting the coal mine water-bursting.
    Characteristics and Mechanism Analysis on Xinyan Expansive Soil Landslide
    XU De-Zhi, CHEN Jian-Ping, LI Yan-Yan, NIU Hong-Zhi
    2012, 41(10):  25-28+32. 
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    Xinyan landslide caused by the new filling embankment，is a kind of partly superficial slide that is recently developed from a large ancient slide. The landslide soil has typical expansive property through mineral composition test and dilatability test on the landslide. This article analyzes the specific characteristics of the expansive soil from the slide shape，slide soil property and landslide deformation，and the genetic type of landslide is analyzed from four aspects of expansive soil，artificial filling，space of lateral deformation and water effect. This provided scientific proof for the supporting structure design of the landslide and played an extremely significant role in deeply studying and treating other expansive soil landslides in this region.
    Risk Analysis and Control Measures for Roof Dynamic Pressure of Roadway Excavated in Coal Pillar near the Goaf
    JIN Jian-Cheng, YU Gui-Liang, DOU Lin-Ming, WANG Jie, LI Ning
    2012, 41(10):  29-32. 
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    This paper focus on 20 meters coal pillars between working face upper 250205 tail entry and working face upper 250204 in mining area 2502 of Yanbei Coal Mine which will induce the danger of rock burst and roadway tunneling and maintaining difficulties. The simulation is made to analyze stress cloud images and bearing pressure curve before and after pressure relief with different coal pillar size. Finally，the roadway layout of working face 250204 and the rational coal pillar size are confirmed，realizing the safety of roadway tunneling，which offer a reference for the layout of mining area and the arrangement of coal pillar in the future.  
    The Application of Reconstruction Prediction Technology of Chaotic Phase Space in Heap Leaching Process of Uranium Ores
    HAN Jing, LIU Guang-Ping
    2012, 41(10):  33-35. 
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    The chaos theory is applied to the heap leaching process of uranium ores. The analysis on the data generated in the process showed that the heap leaching process of uranium has chaotic property. Based on this，several groups of multi-dimensional prediction analysis on the uranium extraction rate are made by using an new local forecasting method. It provides a new concept to establish a reasonable mathematical model in heap leaching process.
    Comprehensive Judgment of Surrounding Rock Grade in Tunnel Engineering
    TAN Huan-Huan, ZHANG Chuan
    2012, 41(10):  36-39+46. 
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    During the construction period of unsupported hole of tunnel project，it is an essential factor for the security support，reasonable construction and safe use of the hole to accurately judge the surrounding rock grade in time. In this paper，taking a project under construction as a case，the comprehensive judgment on the surrounding rock grade is made by four means as the empirical judgment，“standard” calculation，Barton computing method and the advance geological forecast. This provides a basis for timely adjusting the support design and the construction program.
    Economic Evaluation of Multiple Coal Seams Selection in Surface Coal Mine
    ZOU Jin-Jun, CAI Qing-Xiang, DING Li-Ming, CHEN Shu-Zhao
    2012, 41(10):  40-43+46. 
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    The paper analyzed the selected mining types of multiple coal seams and the main factors affecting their own economic evaluation. By studying the impaction of selective mining on coal prices，recoverable reserves，coal consumption costs and environmental costs，an economic evaluation model for multiple coal seams selection is established.
    Application of Soft Rock Tunnel to the Secondary Support Technology
    PANG Bo, WU Yong-Qiang, LUO Ye-Min
    2012, 41(10):  44-46. 
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    In view of the characteristics of soft rock tunnel in the slope road of Sijiaying Iron Mine that is not impacted by mining，the technology of once shotcrete rockbolt mesh-secondary channel steel trellis is put forward for rigid support. This paper introduced the principle and technology of the support in this slope road in detail，and the summarization and discussion on this issue are made. The practice proved that the technology is obviously good for improving the construction speed，security and economic benefits of soft rock tunnel. It provides a good reference for the support of soft rock tunnel.
    Treatment Scheme of Goaf in Eastern Area of Period-I in Makeng Iron Mine
    XIA Dao-Ming
    2012, 41(10):  47-50. 
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    Eastern area of Period-I in Makeng iron mine adopted the open stoping mining method, and the total area of the goafs covers 28 300 m2, and the total volume reaches 747 000 m3.Based on characteristic of goafs and successful experience of closing down goafs and waste filling in eastern area of Period-I in Makeng iron mine, the penman discussed the handling way of goafs of combining filling and closing down which used in Makeng iron mine.
    The Construction of Mining Enterprises' Resource Accounts System Under the Background of Networking Industry Competition
    FENG Qian-Ying, HUANG Xin-Meng
    2012, 41(10):  51-54. 
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    In the context of networking industry competition，the boundary of mining enterprise can be extended; the concept of resource can be expanded，and the competitive advantage derive from the integration of resources. Based on the identification and classification of the mining enterprises' resources，the resources integration model of mining enterprises is built，and according to the thought about accounts setting，the resources accounts system of mining enterprises is designed in order to guide the process of resources integration for mining enterprises，improve their core competitiveness，and promote the sustainable development of mining enterprises.
    Analysis on Water Inrush Cause in Coal Mining Roof of 1312 Face in Zhangcun Mine
    RONG Hu-Ren, BAI Hai-Bo, WANG Zhan-Sheng, ZHANG Bo-Yang
    2012, 41(10):  55-57. 
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    Although the 1312 face in Zhangcun Mine took place intermittent water flush during mining, the height of water fractured zone don't develop to aquifer by empirical formulae. By analyzing hydrogeology conditions from the direct roof of 1312 face in Zhangcun Mine and using RFPA and actual detection to study the law of fractured full-mechanized Caving mining. Results shows that: ①According to the empirical formulae, the max height of water fractured zone is 45~58 m, which is greatly different from the RFPA result (95 m), and the major cause of the higher height of coal-series strata is the thin inferior key strata in direct roof as well as distance to 3 seam less than 58 m; ②The height of water fractured zone is about 96 m by actual detection , which is agreement with RFPA result; ③The spatial position of key-stratum and aquifer determine discontinuous water inrush and lag water inrush will happen in working face.
    My Opinions on Mining Investment in Mexico
    HE De-Sheng
    2012, 41(10):  58-60. 
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    The advantages of mining investment in Mexico were analysed，and the situation of Mexico mineral resources was introduced.Some issues that should be paid attention on investment in Mexico are pointed out. And lastly，some recommendations on the mining investment are given for Chinese mining investors.
    Flocculation-flotation Behavior of the Serratia Spp Strain USTB-1 on Fine Hematite
    YANG Hui-Fen, LI Tian, TANG Qiong-Yao, WANG Chuan-Long
    2012, 41(10):  61-64. 
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    Civil and Environmental Engineering Institute，University of Science and Technology Beijing The Serratia spp strain USTB-1 is obtained from the soil of Sijiaying Iron Mine in Luanxian, Hebei Province. Possibility and effect of the strain as flotation collector for hematite was investigated in the flotation tests on pure hematite by means of microscopy observation and the infrared spectroscopy analysis, and Zeta potential analyzer. The results showed that the bacterium was nearly spherical brevibacterium. Both non-polar and polar groups were detected on the cell surface, showing as negative charge, so it can be acted as collector for hematite. Under the conditions of solution pH 6 and cell concentration of 60 mg/L USTB-1, -30 μm hematite forms as large hydrophobic flocculation group so that the recovery of 80.48% for pure hematite was obtained.
    Study on the Separation of the Oxidized Ore from Yuanjiacun Iron Mine
    HU Yi-Ming, HAN Yue-Xin
    2012, 41(10):  65-69. 
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    In order to provide basic information to the in-depth study on the efficient beneficiation of oxidized ores from Yuanjiacun Iron Mine, research tests of beneficiation practicability for three main oxidized ores including quartz-type oxide ore, quartz-specularite oxide ore, and amphibole oxide ore were made. The results showed that: the quartz and the quartz-specularite oxide ores have a relative good optional condition. Under the final grinding fineness of  85% -0.037 mm, iron concentrate with Fe grade of 65.65% and 65.23% and Fe recovery of 78.03% and 79.45% were obtained respectively by the stage grinding process of low-intensity magnetic separation-high gradient high intensity magnetic separation-anionic reverse flotation. However, the amphibole oxide ore shows a poor performance in separation, and is difficult to be concentrated by the traditional physical beneficiation methods. And it requires to carrying out the study of the magnetic roasting or deep reduction method.  
    Suitable Dressing Process of a Magnetite Ore with Copper and Sulfur
    SUN Fang
    2012, 41(10):  70-74. 
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    The major iron mineral of a iron ore is magnetite and associated with a spot of chalcopyrite and pyrite which can be comprehensive recovered. In order to serve the feasible research and design considerations for developing the mine，carried out four kinds of processes as：discadrding -75 mm tailings via dry magnetic separation-stage grinding and dressing by floatation then magnetic separation or magnetic separation then floatation，stage grinding and dressing by directly floatation then magnetic separation or magnetic separation then floatation to raw ore. According to the test results，commend the process of discadrding -75 mm tailings via dry magnetic separation-stage grinding and dressing by magnetic separation then floatation. This kind process can advancely discard the 21.04% yield of waste-rock and finally get the iron concentrate with iron grade 66.10%，iron recovery 83.48%，content of sulfur 0.26%，copper concentrate with copper grade 15.04%，copper recovery 63.27%，and sulfur concentrate with sulfur frade 45.51%，sulfur recovery 72.89%.
    Semi-industrial Column Flotation Test on Wolframite Revocer from Shizhuyuan Ore
    HUANG Wei-Sheng, LI Xiao-Bing, LI Xiao-Dong, CAO Yi-Jun, CUI Xiao-Kai, NIU Guo-Peng
    2012, 41(10):  75-78. 
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    For the complex technological flowsheet for the recovery of the wolframite of Shizhuyuan polymetallic ore，the lower grade wolframite concentrates，the process of cyclonic-static micro-bubble flotation column is adopted on-site to make the semi-industiral column flotatin tests of wolframite ore. The test results showed that the wolframite concentrates containing WO3 of 44.39% and recovery rate of 86.82% are obtained through the closed-circuit of one stage roughing and two stage cleanings by using three cyclonic-static micro-bubble flotation columns. Compared with closed-circuit of one stage roughing five stage cleanings and three stage scavengings by using the flotation machines，the wolframite concentrates containing WO3 increased 11.45 percentage，and the recovery increased 3.52 percentage，meanwhile three roughings and three cleaings were cut. 
    Experimental Research of the Re-concentration on the Tailings of Column Magnetic Separator by Centrifugal Separator in Banshi Dressing Plant
    CHEN Zhong-Hang, CHEN Guang-Zhen, ZHAO Tong-Lin, DAI Shu-Juan
    2012, 41(10):  79-81. 
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    Taking the tailings of column magnetic separator of two-stage grinding cycle load in Banshi Dressing Plant of Tongsteel as samples, the re-concentration experiments by the centrifuge separator was carried out under different operating parameters in the laboratory. The results show with the drum rotation speed of 400 r/min, water spry volume of 3 L/min and slurry density of 8%, the concentrate with grade of 66.98% and recovery of 81.11% was achieved. It is therefore concluded that the centrifugal separator is efficient in re-concentrating the tailings. It can not only gets some parts of pure magnetite and rich aggregate in advance, but also decreasing the two-stage grinding cycle load to avoid the overgrinding of iron minerals, therefore the goal of increasing the metal recovery rate is achieved.
    Mineral Processing Technology of Wunugetushan Copper-molybdenum Mine
    LIU Hong-Jun, SUN Chun-Bao, ZHAO Liu-Cheng, LU Zhao-Feng, LUO Sheng-Kang, WANG Biao
    2012, 41(10):  82-85. 
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    Wunugetushan copper-molybdenum mine which located on highlatitudes and low temperature area is a large low grade and polymetallic mine. In its design and construction, Wunugetushan copper-molybdenum mine uses the domestic large-scale equipment, including φ8.8 m×4.8 m sem-autogeneous mill, φ6.2 m×9.5 m ball mill, 160 m3 flotation cell, and adopts new process and new technology of SABC crushing and grinding flowsheet（Semi-autogeneous mill+Ball mill+Crusher）, the tailing paste disposal technology and city reclaimed water for supplementary water. The successful application of new technology and new equipment not only realize the comprehensive utilization of Wunugetushan low grade copper-molybdenum mine, but also meet the requirements of cleaner production and environmental protection, thus providing precious experience for the construction of similar domestic mines.
    Study on Process Mineralogy of Oxidized Ore from Ⅴ Ore Body in Yulong Copper Mine
    CAI Liao-Lu, LIU Shuang, LI Wen-Juan, SONG Yong-Sheng
    2012, 41(10):  86-89. 
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    In order to provide basic data for the recovery of oxidized copper ore from Ⅴ ore body in Yulong Copper Mine in Tibet, the process mineralogy was studied by means of chemical composition analysis, phase analysis, optical microscopy analysis and SEM-EDS analysis. The results showed that the ore has a feature of “one-complex three-high one-fine”, showing as complex copper occurrence, high content of limonite, high content of easily-mudding gangue and easily-floating calcite, high content of pyrite, and fine-disseminated useful minerals. It is extremely difficult to concentrate the ores. Therefore, in order to make better use of the copper resources, the combined process should be adopted, and some interference measures be taken in the process, such as fine grinding, removing limonite etc. 
    The Technical Research of Extracting Ground Fissure Information in Mining Area with the UAV Image
    WEI Chang-Jing, WANG Yun-Jia, WANG Jian, ZHAO Hui
    2012, 41(10):  90-92+96. 
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    The research is conducted with the problem of extracting ground fissure information in mining area. The UAV and TM images are used as data sources. Through the extraction of texture feature，linear characteristics，fractal dimension，the NDVI values and spectral features，and using the ERDAS software，a knowledge model is built，and the distribution graphs about ground fissure information is successfully extracted. It proves that the method has higher precision after precision verification on the extraction results.
    Types and Geological Characteristics of the Iron Deposits in Qinglong
    LIU Fei, ZHANG Ting-Ting, WANG Jing-Long, ZHAO Gui-Qiu, LIU Xiao-Bin, GONG Guan-Qian, ZHAO Yan, YAN Li-Xiang
    2012, 41(10):  93-96. 
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    On the basis of long-term fieldwork，summarized the types of iron deposits in Qinglong，the output characteristics and brief geogenesis of banded iron formations(BIFs). It is considered that the main types of Qinglong deposits are BIFs，skarn deposit and a small amount of magmatic rocks. The BIFs mainly occurred in Archean metamorphic formations including Qianxi，Luanxian and Zhuzhangzi rock groups. Magnetite quartzite as the main iron ore，is output in layered or lentoid structure. The iron deposit geogenesis of BIFs is closely related to submarine volcanic eruption，and the banded ferro and siliceous rhythmic strata stand for the periodic cycles of submarine exhalation. Microorganisms have participated in the deposition of BIFs.
    Geological Characteristics and Ore-Prospecting Vision Analysis in Nanyan Area of Jinchuan
    PENG Qiao-Liang, ZENG 南Shi, LI Tian-Hu, QIN Yan-Yin, WANG Wei
    2012, 41(10):  97-100. 
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    Such information as digenetic environment，tectonic setting and basic-ultra basic magma activity rules were investigated through comprehensive analysis of the petrology，geochemistry and geophysics features in Nanyan of Jinchuan area，and then comparative study were carried out with the basic-ultra basic rocks in Jinchuan deposit. All works above make the ore-forming geological characteristics further understood in Jinchuan area. Combined with geophysical and geochemical exploration work，twoⅠ level comprehensive abnormality areas and two Ⅱ level comprehensive abnormality areas were circled into the research area. It is considered that these areas have good the ore-prospecting vision，and are the important ore-prospecting directional and target areas.
    Research of 3D Laser Scanning Measurement System for Mining
    YU Le-Wen, ZHANG Da, YU Bin, YANG Xiao-Cong
    2012, 41(10):  101-103+107. 
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    The 3D Laser Scanning Measurement System for Mining with independent intellectual property rights is put forward. The principle of laser range finding is analyzed，and the system structure and the methods of protection lens are designed. The comprehensive communication method is studied and the control software is developed，and its motion control，data communication，PC display，3d reconstruction and other functions are proposed. The results indicate that the system can measure 3d shape of cavity accurately and calculate related parameters，thus providing the technical support for cavity evaluation and comprehensive management.
    Dynamic Weighing System for Mining Shovel Based on Sensors Network Technique
    XIAO Jun-Sheng, ZHOU Xiao-Feng
    2012, 41(10):  104-107. 
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    In view of the weakness of the present weighing system for mining shovel，this paper raises a design scheme for mining shovel weighing system based on wireless sensors network technique. The configuration of hardware of sensor node，and software design are introduced in detail. Experiments show that the system has high measuring precision，good stabilization and is easy to be installed.
    Application of 3D Laser Scanning Technology in Construction of the Digital Mine
    WANG Chang-Jiang, ZHANG Zhuo-Feng, LIU Fu-Xiao
    2012, 41(10):  108-109. 
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    The paper introduces the merits of 3D laser scanning technology such as fast，convenient，accurate，dynamic，all-digital，high-precision，etc.. Through the application of 3D laser scanning technology in Shandong Jinling Iron Mine，3D tunnel model is built in this mine. Combining with the underground personnel positioning system，the personnel distribution at underground can be intuitively grasped，which is beneficial to the online monitoring and the disaster emergency evacuation and rescue.
    Automatic Control System of Tailings Filling
    CHEN Zhi-Gong
    2012, 41(10):  110-112. 
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    According to the requirements of the tailings filling technology and the process features，the design scheme of the automatic control system with tailings filling is put forward，and the system's configuration，function and control method  are introduced. The application in many enterprises indicated that the system has features of full function，stable and reliable running，rational equipment type selection，and simple and convenient operation. Also，the process parameters such as the concentration of cementing tailings and the cement-sand ratio can be accurately controlled，which ensures the continuity and stability in filling operation，and largely improves the efficiency of filling. 
    The Development of Underground GIS Management System in Meishan Iron Mine and its Application
    WU Hai-Liang
    2012, 41(10):  113-116+119. 
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    In order to make the visualization and the centralized management on the underground comprehensive information，the underground mining GIS in Meishan Iron Mine are researched and developed，and the real-time or space attribute data acquisition is made from the mine geology，surveying，underground production，security，power supply，communications，ventilation，air supply，and water drainage. All data are treated to make a centralized figure-number integrated management and the organic integration by data visualization tools and database technology，thus realizing visualization from the basic data of the mine survey to the underground production management and production scheduling. 
    Effect Comparison Study on Ilmenite Separation of Common Pinched Sluice and Arc Bottom Pinched Sluice
    LIU Jian-Guo, TANG Yu-He, ZHANG Jun, LUO Chuan-Sheng
    2012, 41(10):  117-119. 
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    Based on the analysis of some problems in the common pinched sluice, the new arc bottom pinched sluice is produced by changing the methods of cutting minerals as opening wide mouth in bottom for heavy minerals, and changing the shape of the pinched sluice bottom as curved surface. With use of the common pinched sluice and the new arc bottom pinched sluice, the one-stage coarse contrast experiments on a Sichuan ilmenite ore sample are made. The tests results indicated that the ilmenite concentrate recovery of arc bottom pinched sluice is higher 11.22% than that of common pinched sluice when ilmenite concentrate grade of them is similar, so the separation effect is improved markedly.
    Study on Reform Plan of Ventilation System in Complicated Multiple Mining Area
    WANG Xiao-Dong, HU Nai-Lian, DAI Xiao-Jiang, YU Xue-Chang
    2012, 41(10):  120-126+129. 
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    The study analyzed the ventilation characteristics and problems of the Old Plant Branch of Yunnan Tin Group. Combining with the mine ventilation theory，by drawing the network diagram and the calculation of ventilation network，the multi-fan multi-station ventilation way is adopted. And the operating situation of all levels of station are compared and analyzed. Then，the paper put forward a ventilation system constructing scheme for the three new mining areas according to the principles of security，stability，technical feasibility and economical rationality. Through the analysis and comparison of the related parameters，such as ventilation lines，fan selection，installation position，quantity of air in-outlet and mining area，and the ventilation cost，the optimal scheme which was in line with the practical production was determined. 
    Research of Three Key Issues on Safety Standards of Blasting Vibration
    TAO Liu-Qun, YU Ya-Lun
    2012, 41(10):  127-129. 
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    This paper briefly describes the connotation and the extension of three key issues in the revision process of Safety Standards for Blasting Vibration，including the safety criterion for velocity-frequency two-factor of blasting vibration，the selection of particle velocity and acceleration，and the selection of single-component and three-component vector sum. Among them，the safety criterion for velocity -frequency two-factor of blasting vibration has reached a consensus in the developed countries，and has already been used in blasting safety regulations (GB 6722-2003). Most countries adopt blasting vibration safety standards based on velocity，but in some special industries，such as China′s nuclear power industry，acceleration is used as criteria. For the selection of single-component and vector sum，the three component vector sum peak particle velocity (actual max) is most consistent with reality. Based on a large number of in-depth and comprehensive comparative studies of related national and international documents，it is recommended that the vector sum peak particle velocity (actual max) be selected as guidance levels for blasting vibration standards.
    Prediction and Analysis of Slope Stability by Grey Correlation
    ZHAO Meng-Sheng, ZHOU Min, DAI Yong-Xin, DIAO Hu
    2012, 41(10):  130-133. 
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    The complex slope system is viewed as a grey system，various slope factors in different classification are selected to make comprehensive evaluation on the samples by using the grey correlation analysis. The results show that the grey correlation analysis is a reasonable way to achieve a certain degree of effect in slope stability prediction.
    Research on Mine Merry Heat Prediction Standard
    JIA Min-Tao, CHEN Yi-Hua, WU Leng-Jun, JIA An-Min
    2012, 41(10):  134-136. 
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    Through the analysis of airflow energy balance equation of mine roadway，based on the heat transfer principle，and applying the basic means of mathematics，the calculating formula of airflow temperature and humidity at underground tunnels are deduced. Visual Basic programming technique is adopted to make the temperature and humidity calculation program，which has been successfully applied to predict the air flow temperature and humidity for a gold mine. 
    The Pneumatic Transport and Reuse of Recovered Dust in Barun Mining Company
    ZHAO De-Gui, YAN Chang-Lu, REN Chun-Yong
    2012, 41(10):  137-139. 
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    Pneumatic transport technology played an efficient role in production and development in various industries. It's important to use and promote this technology reasonably. In view of the dust recovery from the crushing area's dust collector in Barun Company，the paper introduces the application process system of pneumatic transport，operation model and the utilization of recycled dust. And then，the corresponding technology problems are discussed. The practice indicates that pneumatic transport can effectively realize the long-distance transport with no pollution，which is good for reuse of recycled dust. Thus it created benefits and also showed a direction for further development. 
    Study on Influence of Indigenous Microorganisms on Migration of U (Ⅵ) , Fe and Mn Ions in Soil
    吕Jun-Wen , ZHANG Yu, DENG Qin-Wen, ZHANG Xiao-Wen
    2012, 41(10):  140-144. 
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    In order to provide theoretical guidance to the disposal of the out-of-service uranium mines, soil samples near a uranium mine that are unaffected by mining were collected and extracted microorganisms. The leaching solution obtained by diluting and adjusting pH values of uranium ore was used to simulate the acid leaching seepage of uranium solid waste, and the influence of the microorganisms to migration of U (Ⅵ) , Fe and Mn Ions was investigated by the dynamic adsorption-desorption experiment of the soil column. The results showed that: with microbial synergy, the adsorption amount of the three kinds of ion increased by 99.7%, 75.2% and 48.6%, respectively, comparing that without microbial synergy. Meanwhile, the desorption rate of the three kinds of ions in microbial soil reduced by 20.4%, 0.4% and 41.0% respectively, comparing with that in no microbial soil, indicating that the microorganism significantly inhibited the migration of the three kinds of ions in the soil. In addition, the soil itself has a strong cushioning effect on acidic wastewater, and has less relation with microorganisms.  
    Study on the Adsorption of Nitrobenzene by Using Modified Water-quenched Slag
    ZHANG Lian-Ke, SUN Peng
    2012, 41(10):  145-148. 
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    The water-quenched slag of Baosteel No.4 blast furnace was treated by the acid-heat joint modification and then used as simulating the adsorption disposal of nitrobenzene wastewater. The effects factor for adsorption and its isothermal adsorption were studied. The results indicated that under the conditions of diameter of 100 mesh, dosage of 8 g/L, room temperature for reaction time of 60 min to treat the wastewater of 10 mg/L nitrobenzene, and pH value of 7, the removal rate of nitrobenzene reached 81.8%. The isothermal adsorption of removing nitrobenzene by the modified water-quenched slag fits the Langmuir and Freundlich equation mode well. The saturated adsorption capacity is 33.56 mg/g at room temperature, and the physical adsorption process of nitrobenzene is easily achieved.
    Research on Preparation of Autoclaved Brick from Stone Coal Acid-Leaching Vanadium Tailings
    HU Fang-Fang, ZHANG Yi-Min, CHEN Tie-Jun, LIU Tao, SHI Wei
    2012, 41(10):  149-152. 
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    Stone coal acid-leaching vanadium tailings was used as the main material with fly ash and slaked lime as the auxiliary materials in preparation of autoclaved bricks by press shaping. When the content of tailing, fly ash and slaked lime is 60%, 20% and 18%, respectively, forming pressure is 15 MPa, the steam pressure is 1.2 MPa for 6 h steaming, the compressive strength of the product is up to the requirements of MU15 brick stipulated in nation standard “GB 11945-1999 Autoclaved Lime-sand Brick”. XRD and SEM analysis indicate that the product is mainly to generate Ca(OH)2 gel phase in the early hydration. After the autoclave of the product, the active silicon dioxide provided by glass microsphere in the tailings and Ca(OH)2 gel phase generates fibrous C-S-H and needles of shape mendicant mullite, which closely combine with the unreacted coarse ingredients so that the product possesses a high strength with tight structure.  
    Beneficiation Test on Recovering Iron and Monazite Zircon from Crushed Mica Tailings
    TANG Ping-Yu, WANG Su, ZHOU Jian-Guo, PANG Yu-Rong
    2012, 41(10):  153-156+168. 
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    Taking the tailings of crushed mica mine by wind in Lingshou county, Hebei province as a case, the beneficiation tests to make comprehensive recycling of iron minerals, monazite and zircon were made. The results showed that heavy minerals were concentrated by the cleaning table from the tailings, and the heavy minerals were concentrated by the joint process of low intensity magnetic separation-wet high intensity magnetic separation-dry high intensity magnetic separation-gravity separation by tabling. Then, Iron concentrate with Fe grade of 60.86% and recovery of 74.27%, monazite concentrate with REO grade of 61.13% and recovery of 70.36%, and zircon concentrate with (Zr,Hf)O2 grade of 60.38% and recovery of 65.64% were obtained respectively. 
    Study Progress of the Activation of Granulated Blast Furnace Slag Cementitious Material
    WU Peng, 吕Xian-Jun , HU Shu-Gang, ZHANG Lei
    2012, 41(10):  157-161. 
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    The granulated blast furnace slag is a kind of amorphous glassy structure material, it's chemical composition is quite similar to the silicate cement clinker, and has the potential cementitious activity. This paper analysed the characteristics of the composition and structure of the granulated blast furnace slag, elaborated the reason and influencing factors of the cementitious activity. The paper focused on some activation method of the slag and the progress we've made. And summarized the understanding of the hydration mechanism of the slag now.
    Influence of Fly Ash Performance of Slag Cemented Backfilling Materials
    DONG Lu, GAO Qian, 南Shi-Qing , HE Huan-Sha
    2012, 41(10):  162-164. 
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    In view of the features of fly ash as abundant resources，low costs and improving the construction of mortar，the influence of fly ash on strength and liquidity of slag cemented materials is studied through experiments. The results show that the slag cemented backfilling materials with the lime and desulfurization gypsum as the activator，the compressive strength of backfilling body gradually declined with the adding amount of fly ash increasing. 1% of fly ash is added each time，the intensity decreased by 1.82% at 7 d and by 1.61% at 28 d on average. Meanwhile，the yield stress and viscosity of the backfilling is getting lower，which indicates that fly ash can largely improve the rheology of backfilling materials，and make high concentration of mortars conveying by gravity flow. Comprehensively considering the strength and the rheology，the optimal dosage of the fly ash ranges from 10% to 20%. 
    Preparation of Whole-tailings Paste Backfilling Material with High Steel Slag Content and None Clinker Aggregate
    HU Wen, NI Wen, ZHANG Jing-Wen
    2012, 41(10):  165-168. 
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    Using steel slag and tailings as the main filling material，this paper determined the optimized ingredient of the backfilling materials by analyzing the strength characteristics and mortar fluidity. X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM) were used to observe microstructure and hydration products. The experiments result indicated that mortar fluidity can of artesian cemented filling and the 28 d compressive strength is 3.73 MPa which can satisfy the requirement of compressive strength for mine filling when the content of steel slag，desulphogypsum，and slag is 63%,12%，and 25%.