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Table of Content

    15 July 2013, Volume 42 Issue 07
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    Stability Analysis and Optimization on Pillar Mining Based on the Finite Element Method
    LU Hong-Jian, ZHANG Jin-Feng
    2013, 42(07):  1-3+104. 
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    Based on the pillar status of Jinshandian iron mine in WISCO, the feasibility scheme of the pillar mining is simulated by using elastic-plastic finite element theory and the stability of the surrounding rock and surface among the mining process by different scheme is analyzed. Based on all summaries about the pillar mining strata movement and surface deformation law, the damaged area in the surface during Jinshandian pillar mining with different mining schemes is delineated. Then, the reasonable pillar mining scheme is determined.
    Feasibility Analysis and Safety Evaluation of Coal Mining above High Confined Water
    SHEN Jian-Jun, LIU Wei-Tao, WANG Xian-Wei, LIU Yun-Juan
    2013, 42(07):  4-7+70. 
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    In order to overcome floor water inrush under mining above confined water, especially for deep mine, it's necessary to analyze the feasibility and make the safety evaluation before development and mining. According to the hydrogeological conditions analysis at deep mining area of a certain mine, it is considered that this area is available to mining. With the use of the floor seepage model and the modified hydraulic parameters, and based on FLAC3D anisotropic permeability model, the coupled simulation of stress field-seepage field is simulated to obtain the depth of floor failure. The results show that the floor damage deepness at normal region and at structural damage region are about 25 m and 50 m respectively. According to the water bursting coefficient, the safety depth of mining and the length of working face are evaluated. At the same time, prevention and treatment measures of water disaster are also presented. Keeping the water bursting coefficient of 0.06 MPa/m, taking hydrophobic decompression measures, lowering the water head to -950 m level, it is safe to recover the 15# coal seam.
    Application of the New Technology of Stope Pillar Recovery
    REN Wei-Dong
    2013, 42(07):  8-11+16. 
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    In combination with the successful practice of pillar recovery of chongqing bauxite and Yuxi bauxite robbing success practice，the application of a new alternative method for bauxite mine pillar recovery is introduced，thus providing a feasible engineering technology for the pillar recovery and roof management.At the same time，this method was successfully applied，it was very favorable in improving the recovery rate of mine ore，increasing mining economic income and realizing the safety and efficiency of mining recovery，and has positive significance in application promotion.
    Research on Failure Mode of High and Steep Slope in Nanfen Open-pit Iron Mine
    ZENG Hai-Bai, CHEN Xiao-Gang, TAO Zhi-Gang, XIE Xing
    2013, 42(07):  12-16. 
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    With the high and steep slope of Nanfen Open-pit Iron Mine as the support to make the theoretical research，and based on the understanding of the engineering geology，the deformation and failure of slope rock mass is studied deeply，and the statistical survey on its joints are made by the partition to determine the failure modes of the stope slope and analyze the stability status and the development trends. So，if the failure mode is confirmed distinctly，the landslide' sliding direction，size，shape and its mechanism will be all clear. And then the slope is reinforced，protected and monitored pertinently. It has important social and economic significance in ensuring the stability of high steep slope and keeping sustainable development of open pit mine.
    Study on Swelling Deformation Properties and Release Rules of Soft Rocks
    MING Jian
    2013, 42(07):  17-19+23. 
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    In view of skarn rocks and red slate rocks in Zhangjiawa Iron Mine of Minmetals Luzhong Mining Co.，Ltd.，experimental studies on swelling deformation and release rules of soft rocks are carried on by adopting the dry-wet circulation method under the equal conditions. Experiment results show that the rock's swelling releases gradually with the cycle number increasing，and finally tends to be a fixed value. The rules described above provide theoretical basis for the support of soft rocks.
    Once-tunneling Construction Technology of Large Cross-section Open-off Cut in Fully-mechanized Face
    ZHANG Wen-Tao, CHEN Qun-Zhong, LI Ai-Jun, LEI Xi-Liang, DAI Zi-Dong
    2013, 42(07):  20-23. 
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    Taking the open-off cut in 21208 working face of Chensilou Coal Mine as example, and according to the actual geological conditions of the working face, the once-tunneling construction technology of the large cross-section open-off cut in full-mechanized face is studied. The study provides a reference for other mines under similar condition by summarizing the advanced methods and successful experience.
    Improvement on Mining Method of a Copper-containing Magnetite
    YUAN Yang
    2013, 42(07):  24-26+30. 
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    According to the requirements of the mineral exploration in China，and in order to improve the recovery rate and reduce the wastes，the original open stope method is changed into the open stope method with subsequent filling. This new mining method makes the recovery rate increased from 81.2% to 95% and efficiently recovers the iron (copper) ore resources of 250 000 t. It effectively improved the utilization of mineral resources，enhances the economic efficiency for enterprises，and removes the negative effect of rock environment caused by the open stope method as well.
    Effect of Underground Mining on the Expressway Tunnel
    WANG Le-Jie
    2013, 42(07):  27-30. 
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    To grasp the effect of underground coal mining on the expressway tunnel and ensure the safety of the expressway tunnel，and based on the prediction of the surface movement and deformation，the influence of underground mining on the expressway is analyzed in accordance with the expressway characteristics.The research results show that:the mining damage conforming to level I of damage criteria for general buildings can be classified as a minor damage.Proper protective measures in aspect of the resistance to deformation should be undertaken for two wall rocks with grade V inside the tunnel in order to reduce the adverse effect of mining.The results play a guiding role in the construction of the expressway，and have certain reference values and theoretical implications for similar expressway tunnels.
    Discussion on Analysis Method of Influence on Planning-construction Area by Mining
    ZHANG Guang-Wei, WANG Le-Jie, FANG Jun, CAO Xin-Kuan
    2013, 42(07):  31-34+37. 
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    With the transformation and development of the mining cities, more and more construction projects are under the influence of mining or mined-out area. In order to study this influence, the paper takes a coal mine as an example, and combines the numerical simulation with surface subsidence prediction to analyze the mining influence on the planning-construction area. Based on the analysis result, a scientific and rational planning and construction programme is given. This may provide reference for the safe operation of planning and construction projects.
    Experimental Research on the New Non-pillar Continuous Mining Method for Underground Metal Mines
    YANG Xiao-Cong, YANG Zhi-Qiang, JIE Lian-Ku, WEI Ming
    2013, 42(07):  35-37. 
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    Through the experimental research on the entire mining scheme for 1# ore-body of Anqing Copper Mine，a new non-pillar continuous mining method for underground metal mines is proposed.In this method，a isolation layer formed by the high strength cemented tailing filling body and the triangle pillars at bottom structure replaces the horizontal floor pillars.Also，every mining step should be ensured to be safe and high efficient through reasonable stope layout，stoping sequence and backfill method.This method provides a new thought for the continuous mining of total ore-body.It has a certain significance for enriching the theory of the continuous mining.
    Research on Mining Scheme for Houhemushan Section of Gushan Mining Company
    CHEN Xian-Long, XU Zhi-Hong, XIAO Fu-Long
    2013, 42(07):  38-40+44. 
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    Based on introducing the mining conditions of the deposit in Houhemushan section of Gushan Mining Company，the joint of the pillarless sublevel caving method and the induced caving is determined as the mining method for the primary section of Hemushan deposit，and the induced caving with double working faces is as the mining plan. The larger structural parameters (stope structure parameters 15 m × 12.5 m for -150 m section，stope structure parameters 12.5 m × 12.5 m for -162.5 m section) and induced caving techniques are adopted to determine the construction order for mining preparation and the stoping sequence，and the mining engineering tests are carried out. The tunneling and supporting technical measures are proposed for the soft rocks for mining preparation to ensure the smooth progress of mining.
    Study on Variation of the Slope Stresses During the Secondary Unloading Process Based on Similar Experiment
    CHEN Chao, ZHANG Ya-Bin, GAN De-Qing
    2013, 42(07):  41-44. 
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    Through similar experiment study, the stress transformation mechanism of slope rock mass in the mining process of resident ore-body was studied, and its slope stability was analyzed. The research showed that during open pit mining process, the horizontal strain tends to increase, and ground stresss unloads at open mined-out area; During the mining process of resident ore-body, the horizontal strain tends to decrease, the slope internal stress is redistributed, and the ground stress unloads at underground mined-out area. Stress concentration area is formed around underground mined-out area, which leads to decreasing of slope surface horizontal stress. But resident ore-body mining produces less impact on slope stability.
    Numerical Simulation of Grouting Reinforcement of Cracked Surrounding Rocks and its Application in Engineering
    YUAN Bo, ZHANG Zhao-Qian, ZHANG Bai-Sheng, ZHOU Zhou
    2013, 42(07):  45-48+53. 
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    The paper introduces the application of grouting reinforcement technique in cracked mining gateway，and analyzes the mechanism of grouting reinforcement. That is，the grouting slurry can increase the strength of cracked surrounding rocks，change the failure mechanism of surrounding rock and enhance the stability of surrounding rock under the action of filling and compacting. Through the UDEC numerical simulation and the measured data of Gaohe Coal Mine，it is obtained that the simulated relative maximum displacement of roadway roof and floor is 307 mm，and the simulated relative displacement of both sides is 229 mm，The measured relative maximum displacement roadway roof and floor is 359 mm，and that of both sides is 262 mm. The simulated data are basically consistent with the measured data，and the roadway deformations are effectively controlled. The research provides a technical guarantee for safety production in the working face. The grouting technique owns a guiding significance for roadway reinforcement of similar crushed surrounding rocks.
    Research on Stability Control Technology of Surrounding Rock of Chamber Group in Extremely Week Cementation Stratum
    FENG Wei, HAN Li-Jun, REN Guang-Zhu, ZHANG Fan-Ge, LI Yun
    2013, 42(07):  49-53. 
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    For rock stability of chamber group in extremely week cementation stratum in central substation of west No.1 mine in Wujianfang, with combination of field tests, numerical simulations and site monitoring, the deformation law of surrounding rocks and the stability control program under several construction disturbances in chamber group and its adjacent roadway are obtained. A composite supporting scheme is proposed, that is, the steel mesh/shotcrete+ arch support is adopted as the first supporting, the concreting supporting scheme with the single layer steel reinforcement is used as the second supporting and advance support or temporary support is at intersection point. The field experiment shows that the stability of chamber group and adjacent roadway is relatively good and such supporting scheme reaches an ideal supporting effect. The scheme provides a certain reference for the construction of chamber groups in the extremely week cementation stratum.
    Dynamic Response Analysis of Earthquake and Traffic Loads of Xinyan Landslide
    MA Yu-Fei, CHEN Jian-Ping, NIU Hong-Zhi, XIONG Hui, XIANG Liang-Jun, HE Long-Xiang
    2013, 42(07):  54-57+61. 
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    To research the effects of dynamic loads on landslide stability，based on the Xinyan landslide on the Wangyan highway in Jilin Province，a finite element model was established with the help of GeoStudio，then earthquake loads with different PGAs and traffic vibration loads were input. The influence of these dynamic loads on landslide was reflected through the changes of landslide stability coefficient. Through comparing before and after the inputs，it was found that stability coefficient of landslide decreased under dynamic loads and the decrease value under the traffic vibration loads was larger than that under the earthquake loads. Therefore，it can be concluded that the landslide stress and stability are greatly influenced by these two dynamic loads，and especially the influence of traffic vibration loads is larger. The results can provide certain reference for stability evaluation and supporting design of highway landslide under dynamic loads.
    The Corporate Social Responsibility Study in the Mineral Resources Investment activities of Chinese State-owned Companies
    LIU Dong
    2013, 42(07):  58-61. 
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    Through questionnaire surveys and interviews, this paper explores the corporate social responsibility implementation situations of Chinese state-owned company in the mineral resources investment activities in South Africa from two aspects of the Chinese manager's attitude to the social responsibility and their practice.
    The Predication Sensitive Index of The Outburst and Rockburst of Coal Seam Working Face
    ZHAO Wu-Qiang, WEI Xi-He, TANG Bing-2, XU Chun-Zhao
    2013, 42(07):  62-66. 
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    Based on low prediction accuracy and low index of outburst Phenomenon of the dynamic disaster in excavation working face under the special engineering geological mechanics environment in deep mining, combining with the strength difference of Xiayukou 2# coal region and its gas unbalanced occurrence, the dynamic combination forecasting system for deep excavation working face of 2# coal seam is built through theoretical analysis, experiment and field tests. The research shows that when the coal ore-body's structure is in classⅠ~ III, and the roof rock is hard and integral, The correlation between drilling cuttings S value and its particle size distribution index Sξ is clear, and Sξ prediction of rock burst hazard exceeds 30%; When the frontal structure of coal ore-body is in Ⅳ ~ Ⅴ and the thickening of coal seam is abnormal, the correlation between S value and S, Δh2 value is not obvious, the difference of S, Δh2 is significant, and the outburst danger exists when S≥6 kg/m, Δh2≥120 Pa. In the tectonic stress abnormal area of fold and faults and the mining superimposed stress zone, the impact and outburst exists at the same time. There is no out burst predicted in field working face with the impact accuracy rate of 100%. The prediction index and critical value are reasonable and effective.
    Depression of Carboxymethyl Starch with High Degree Substitution in the Reverse
    ZHU Yi-Min, JIA Jing-Wen, REN Jia, LIU Jie, LI Yan-Jun
    2013, 42(07):  67-70. 
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    A new kind of carboxymethyl starch with high degree substitution,DRJ synthesized by the solvent method was used as depressor of iron ore. Technical conditioning tests of reverse flotation for mixed magnetic concentrate in beneficiation plant of Anshan Qidashan Iron Ore with Fe grade of 43.57% were made. The results showed that anionic carboxymethyl starch DRJ has a strong inhibiting effect on iron minerals. Under the condition of the dosage of DRJ 400 g/t，CaCl2 200 g/t，and collector LKY 600 g/t，pH=11.5，the iron concentrate with Fe grade of up to 65.95% and Fe recovery of 89.22% was obtained by one-stage reserve flotation. XRD and SEM analysis indicated that DRJ not only has a strong inhibiting but also with a good depressing effect in iron ore flotation.
    Beneficiation Tests of a Molybdenum Ore with Lead from Shaanxi
    HUANG Ru-Jie, XIE Jian-Hong, ZHANG Chong-Hui, LIU Zhen-Hui
    2013, 42(07):  71-74. 
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    The Mo-Pb minerals in a molybdenum sulfide ore containing lead in Shaanxi are mainly the native sulfides which are closely associated with each other and have fine dissemination. Technical condition tests for beneficiation of the ore were studied. The results showed that through the process of one stage grinding-mixed flotation with one roughing and one scavenging,regrinding of mixed Mo-Pb coarse concentrate,three stage mixed cleanings，Mo-Pb separation with one roughing，two scavenging and two cleanings,middles back to the flowsheet in turn，molybdenum concentrate with Mo grade of 52.32%，recovery of 92.50% and Pb content of 4.52%，and Lead concentrate with Pb grade of 40.98%，recovery of 70.42%，and Mo content of 0.43% were finally obtained.
    Pre-concentration of a Au-Cu Associated Ore with X-ray Radiation Separator
    WANG Ze-Hong, CHEN Xiao-Long, HAN Yue-Xin, XU Chang
    2013, 42(07):  75-78. 
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    Gold in Gouliang gold ore of Chifeng gold plant is mainly associated with chalcopyrite. According to this characteristics of the ore，pre-concentration tests by X-ray radiation were carried out to select the separation threshold values according to the copper content for the particle sizes of 150~90 mm，90~30 mm after the ore was crushed to 150~0 mm. The results demonstrated that when the separation threshold value for 150~90 mm ore is 0.1 and 0.07 respectively，with one roughing and one scavenging，Cu grade of 1.26%，Au grade of 9.80 g/t，Cu recovery of 96.27% and Au recovery of 90.61% were obtained. When the separation threshold value for 90~30 mm ore is 0.06 and 0.04 respectively，with one roughing and one scavening,Cu grade of 1.32%，Au grade of 6.77 g/t，Cu recovery of 98.69% and Au recovery of 96.75% were obtained by preconcentration. The yield of pre-concentration reached 35.08%. The tests results indicated that Au is mainly associated with chalcopyrite，the separation threshold can be determined according to the copper content.
    Beneficiation Tests of a Copper Oxide Ore from Yunnan
    LIU Bao, SUN Qian-Yu, LIU Miao
    2013, 42(07):  79-82. 
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    A refractory copper oxide in Yunnan with high degree of oxidation，serious mudding，fine or uneven disseminated size of useful minerals，and coarse disseminated copper sulfide,etc. Technical condition tests for beneficiation are made by the principle of firstly floating copper sulphide minerals and then floating copper oxide minerals. The results show that for copper oxide minerals，the grading separation process can effectively resolve the sludge constantly circulating and accumulating problems during the whole flow-sheet. Through the closed circuit，copper sulfide concentrate with Cu grade of 21.43%，and recovery of 47.73%，copper oxide concentrate with Cu grade of 17.41% and recovery of 19.39%，are gained respectively. In total concentrates，Cu grade is 20.09% and Cu recovery is 67.12%.
    Beneficiation Tests of a Molybdenum Ore in Guangxi
    LIU Hao, SUN Wei
    2013, 42(07):  83-85+96. 
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    A molybdenum ore in Guangxi is fine-grained disseminated and low in grade. It′s mainly exists in molybdenite，with single metallic mineral. Technical conditions for beneficiation of the ore were studied. The results showed that the process of rough grinding-rough concentration-regrinding for coarse concentrate-cleaning concentration is an efficient and energy-saving process for treating this type of ore. Molybdenum concentrate with Mo grade of 49.67% and recovery of 92.70% was finally obtained by the process of one roughing，two scavengings，six cleanings and middles back to the process in turn.
    Beneficiation Tests of a Low Grade Copper Molybdenum Ore in Shandong
    WANG Shu-Hong, SUN Yong-Feng
    2013, 42(07):  86-88. 
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    A certain porphyritic Cu-Mo mine in Shandong with low grade of copper and molybdenum，and 90% of the total copper and molybdenum exist in Copper sulfide and molybdenum sulfide.Study on recovery of copper and molybdenum for this ore were carried out. The results showed that with grinding fineness of -0.074 mm 65%，Co-Mo mixed concentrate are obtained by preconcentration of bulk flotation tests. Copper and molybdenum separation tests were conducted under the condition of regrinding the mixed Cu-Mo concentrate to the fineness of -0.043 mm 80%. Copper concentrate with Cu grade of 20.34% and recovery of 90.23% and molybdenum concentrate with Mo grade of 50.33% and recovery of 87.53% were finally obtained.
    Experimental Study of Acid Leaching of a High Conjunctive Copper Oxide
    吕Jin-Fang , JIAN Sheng, YANG Lin
    2013, 42(07):  89-90+152. 
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    The main copper minerals in a copper oxide mine are cuprite and chrysocolla with Cu grade of 6.91%, oxidation rate of 98.30%, conjunction rate of 45.60%, which copper can be easily recovered by the sulfuric acid leaching process.The technical conditions for the sulfuric acid leaching process were studied, and the results showed that under the conditions of the dosage of sulfuric acid 185.6 kg/t, pulp density of 35%, the grinding fineness of -200 mesh 60% for leaching time of 1.5 h, the copper leaching rate reaches 95.51%.
    Flotation Experiments of a Gold Ore in Shandong
    LI Yan-Jun, CHEN Bo
    2013, 42(07):  91-92+96. 
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    The gold particle in a quartz-vein type gold ore with low sulfur in Shandong is uniform granularity，and exists in pyrite or quartz，in form of fissure gold and inclusion gold. Research of the technical conditions for grinding and separation of the ore showed that under the grinding fineness of -0.074 mm 80%，gold concentrate with gold grade of 61.33 g/t，and recovery of 93.73% was achieved by the process of one roughing，two scavengings，two cleanings and middles back to the process in turn.
    Beneficiation Tests of a Low Grade Phosphate in Hebei
    ZHAO Bing-Hui, SHI You-Jun, KANG Zhi-Qian, GE Min, TIAN Jiang-Tao, WEI Gang
    2013, 42(07):  93-96. 
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    A low grade phosphate ore in Hebei belongs to the P-Fe containing biotite pyroxenite with feature of ore exposing to the surface and higher level of weathering. The technical conditions were investigated by the process of phosphorus floatation and then low intensity magnetic separation for iron concentration. The results showed that phosphorus concentrate with P2O5 grade of 34.19%，Fe content of 0.23% and P2O5 recovery of 95.24%，and iron concentrate with Fe grade of 64.31%，P2O5 content of 0.11%，TFe recovery of 48.86% and mFe recovery of 97.88% were finally obtained by the process of one-roughing，three-cleaning，one-scavenging and middles back to the flow-sheet in turn for phosphorus floatation，and then one roughing and one cleaning of low intensity magnetic separation for iron concentration from phosphorus tailings.
    The Characteristics of Ta-Nb Resources and Its Beneficiation Technology
    CHENG Zheng, WU Xi-Qing, YANG Ping-Wei
    2013, 42(07):  97-100. 
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    The paper introduces such prominent features of Chinese tantalum and niobium resources as less singular deposits，more associated deposits，low ore grade，closely associated with other minerals，highly concentrated regional distribution of tantalum and niobium deposits and so on. According to the difference of the density between tantalum and niobium minerals and other minerals as well as the dissemination size of ores，the recovery process of tantalum and niobium minerals are summarized. For ores with high density in tantalum and niobium minerals and a coarse-grained dissemination level，the gravity separation as the main way is generally accepted. For ores with high density in various minerals and a coarse-grained dissemination level of tantalum and niobium minerals，a joint process of gravity separation，magnetic separation and electric separation is mostly adopted. For ores with high density in various minerals and fine dissemination of tantalum and niobium minerals，the flotation process is given the priority.
    Geochemical Characteristics of a Sandstone Uranium Deposit from Xinjiang and Their Effects to In-situ Leaching of Uranium
    CHEN Liang, TAN Kai-Xuan, XIE Yan-Shi, LIU Jiang, HUANG Wei
    2013, 42(07):  101-104. 
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    Geochemical characteristics (including major elements，minor elements and chemical speciation of uranium) of a sandstone uranium deposit from Xinjiang and their effects to in-situ leaching of uranium have been analyzed.The active uranium in the chemical speciation of uranium is principal，with low proportion of the inert uranium.Effects of contents of SiO2 and Na2O and LOI (loss on ignition) on uranium concentration of leaching solution are relatively large，but that of the distribution of minor elements are light.Chemical speciation of uranium is a decisive influencing factor for leaching rate of uranium.The higher content of active uranium is，the higher leaching rate of uranium will be in general，and vice versa.Hence，the sandstone uranium deposit can be exploited suitably by using the technique of in-situ leaching with dilute sulfuric acid after integrated considering the distribution characteristics of major elements and the chemical speciation of uranium.
    Analysis on Relationships Between Magnetic Susceptibility and Density of Rock and Ore in the Moon Mountain Iron Copper Deposit in Chile
    LU Jia, FANG Wei-Xuan, LI Tian-Cheng
    2013, 42(07):  105-108. 
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    With the magnetic measurements as main method and the density as auxiliary one，the paper studies the relationship between susceptibility and density of iron-copper ore in the Moon Mountain iron copper deposit in Chile，it is considered that the rock and ore in the area can be divided into four categories:magnetite(hematite) type，copper-bearing magnetite type，hematite (specularite) type and breccia type; the magnetic susceptibility of the ore show a positive correlation with its density and TFe content in the area.The higher TFe content is，the greater magnetic susceptibility and density will; The lower TFe content is，the lower magnetic susceptibility and density will be.In the later prospecting work in the Moon Mountain mining area，the abnormal zone with high density and high magnetic susceptibility of magnetite (hematite) and copper-bearing magnetite，and the abnormal zone with high density and low magnetic susceptibility of hematite and specularite are delineated to position the prospecting target area，which is an excellent prospecting method.
    Isotope Compositions and their Geological Implications of Laowangzhai Gold Deposit
    DENG Bi-Ping, LIU Xian-Fan, LU Qiu-Xia, ZHAO Fu-Feng
    2013, 42(07):  109-112+117. 
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    Through the study of H-O-C-S isotopic data for rock (mine) stones from Laowangzhai gold deposit，the characteristics of hydrogen-oxygen isotopic compositions indicated that water in ore-forming fluid is the mixed magmatic water.Both carbon and sulfur isotopic compositions have clearly mantle-derived characteristics.From what has been discussed above，the ore-forming fluids of Laowangzhai gold deposit mainly derives from deep mantle，and their properties are transformed from magma fluids to hydrothermal fluids in the course of metasomatism and alteration，which leads to crust-mantle mixing simultaneously to be in favor of mineralization.
    Research and Design of Mine Safety Monitoring Network
    JI Hong
    2013, 42(07):  113-117. 
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    A novel design method for mine safety monitoring network based on the special development form of mines is proposed. According to the different environmental conditions of development roadways and preparatory workings，controller area network (CAN) bus protocol and ZigBee wireless communication protocol are utilized to establish network. The new mine safety monitoring network has the advantages of both reliability and real-time of the wired network and flexibility and adaptability of the wireless network. With the poor environment and serious noise in preparatory workings，the application of error control coding methods in roadway wireless communication is analyzed with roadway channel model and the simulation，and moreover the special design method is proposed. Finally，the design of hardware and software of mine safety monitoring network is presented. The new design method for mine safety monitoring network has important reference value for the improvement of mine production safety.
    Design of Symbol System for Coal-bed Gas Surface Gathering GIS
    ZHANG Yan-Min, RUI Xiao-Ping, LIU Zhen-Yu
    2013, 42(07):  118-121+125. 
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    This paper introduces the general method to realize symbol making, import and export of symbol library, management of symbol, symbols stored in database and symbol application by the symbol library provided by ArcEngine which is GIS components of ESRI and studies its adoption in the map application to enable that it can match with other elements on the map. The method works well when applying in the Coal-bed gas surface gathering system of geographic information system. It has certain reference for GIS development using ArcEngine.
    Research of Access Control Model for Mine Security Knowledge Management System
    XIONG Hai-Tao, JIANG Cheng-Rui, REN Yu-Feng, JIA Pan
    2013, 42(07):  122-125. 
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    For safety authorization to proper security knowledge in mine security knowledge management system and reliable changing of authorization according to users' history access, the reputation-based access control (ReBAC) is proposed, which extends role-based access control (RBAC) with reputation. ReBAC builds 6-tuple permissions firstly. Then, the trust network is constructed by the operational relation between users for calculating direct-reputation and indirect-reputation. After that, ReBAC uses reputation to check if the user can access this security knowledge and give permissions to reliable users. The result shows that ReBAC can provide safety and reliable access control in mine security knowledge management system.
    Development Status of Large-scale Hydraulic Gyratory Crusher at Home and Abroad
    QIU Jing-Wen, GUO Wen-Zhe, FU Xiao-Rong
    2013, 42(07):  126-134. 
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    With the representative gyratory crusher models of the Metso's SUPERIOR60-110E type，the Flsmidth's TS-type and UD-type，the Sandvik's CG series，and the ThyssenKrupp's KB series and BK Series，the paper introduces the technical characteristics of the most advanced large-scale hydraulic gyratory crushers of the four foreign famous crusher manufacturing companies separately. At the same time，the technical characteristics of large-scale hydraulic gyratory crushers made by Chinese North Heavy Industries and CITIC Heavy Industries were introduced，moreover，the proposals for developing the large-scale hydraulic gyratory crushers in China were put forward，aiming at the gap of crusher making fields between domestic and abroad.
    Improvement of the Magnetic System of Annular Magnetic Separator
    CHEN Guang-Zhen, WANG Pei-Xin, JIN Zhen, JIA Xi-Yin
    2013, 42(07):  135-138. 
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    Aiming at the problems of Fe grade in tailings of rough low intensity magnetic separation with annular magnetic separator higher than that of the on-site drum magnetic separator in dressing plant of Dagushan，the modification measures by adding an always-on magnet exciting coil to the annular magnetic separation and installing magnetic yoke rings to all the magnetic exciting coils have conducted. The key parameters of the improved annular magnetic separator were investigated and the beneficiation effects of the annular magnetic separator before and after improvement were contrasted. The result showed that under the same parameters and testing conditions，the improved annular magnetic separation not only guarantees the quality of concentrate，but also the percentage of Fe grade reduces 2.2，and the percentage of Fe recovery increased 2.95，the ideal modification effect was achieved.
    Analysis of Factors Influencing Magnetic Field's Characteristics in HGMS Based on ANSYS
    ZHENG Xia-Yu, LI Mao-Lin, CUI Rui, GUO Na-Na
    2013, 42(07):  139-143. 
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    The magnetic field characteristics around the matrices under different ways of arrangement and combination were simulated by using ANSYS. The results showed that，it has no effect on the magnetic field strength and gradient whether the matrices are permutated aligned up and down or alternately up and down，but the latter is good for the capture of particles; Increasing the matrices filling rate in a certain extent is beneficial to improve the separation efficiency，but excessive increase of matrices filling rate will impede the flow of slurry and reduce the magnetic field strength and gradient，which is bad for the capture of magnetic particles; Using matrices of smaller cross-sectional area，suitable cross-section shape and choosing matrices of higher saturation magnetization are all good for improve the strength and gradient of the magnetic field around the matrices. High gradient magnetic separator,
    Expert System of Mill Running in a Dressing Plant from Chengde
    ZHANG Jie, WANG Jian-Min, YANG Zhi-Gang, LI Yan-Jiao
    2013, 42(07):  144-148. 
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    For large inertia，lag and nonlinear characteristics in process of mill running，an expert system based on fuzzy self-optimizing control was put forward. Fuzzy control，self-optimizing control and traditional PID control are organically combined together，and used in control design of grinding classification system of a concentrator in Chengde. By combination of PLC and industrial control computer form a DCS system. Practice shows that the expert system for the safe and stable operation，energy saving effect is obvious. It can greatly reduce the labor intensity of on-site operation，and also improve their working conditions.
    Evolution Law of Phreatic Line in Valley-type Tailings Dam under Heavy Rainfall
    DAI Hui, QIN Wei-Xing, ZHANG Yue-An
    2013, 42(07):  149-152. 
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    It is very important to reveal the evolution law of phreatic line caused by rainstorm during and after rainfall for the safety of tailings pond in operation，as heavy rainfall often leads to quick fluctuations of water level for valley-type tailings dam.Taking a valley-type tailings reservoir for example，the corresponding finite element mesh model is created，and the evolution of phreatic line under the rainfall and changing water level is studied systematically with unsteady and unsaturated seepage theory in the process of one water level fluctuation.The simulation results are shown as followings:①At the first stage of rainfall，only the phreatic line near the original tailings dam uplifts;②With the lasting rainfall，the phreatic line uplifts everywhere and the beach length keeps decreasing;③Just after the ending of rainstorm，the phreatic line continues uplifting and reaches the highest position，and the beach length becomes shortest at that time; ④In a longer time after ending rainfall，the phreatic line drops gradually and goes back to its initial position，however the moment of return of phreatic line lags longer behind the time of ending rainfall.Consequently，in order to ensure the safety of valley-type tailings dam under heavy rainfall，monitoring the phreatic line should be focused on different key items by stages according to its evolution characteristics，and especially during several days after rainfall.
    Research of Tailings Pond Supervision Level Classification System Based on Disaster Risk
    YUAN Li-Wei, JIN Long-Zhe, CHEN Yu-Ming
    2013, 42(07):  153-158. 
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    Through the statistical analysis of accident at home and abroad, and the characteristics of the tailings in China, it shows that the tailings pond's accidents are mainly concentrated in the low dam and small tailings, rather than large or medium one, which reflects that the safety supervision hierarchy of the tailings pond is not reasonable in China. The problem of tailings supervision system in our country is comprehensively analyzed, and the division of tailings pond safety regulatory hierarchy is proposed based on the disaster risk degree. Bases on itself characteristics of tailings and the level of safety and harm, the disaster risks of tailings pond are divided into four types such as the highest risk, the higher risk, high risk and general risk. Cooperated with the administrative management in our country, the reasonable and improved tailings safety supervision level classification system is formed, which can reduce effectively the incidence and harm of the tailings safety accident.
    Reliability Analysis of Underground Mine Drainage System
    SHAO Bi-Lin, WU Qiong
    2013, 42(07):  159-161+165. 
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    With the reference of the design specification of underground drainage system，the state transition matrix analysis method in the reliability theory is used to demonstrate that the limit on the number of pump spare in traditional reference specification is unreasonable.The relationship between the equipment and the reliability is pointed out under certain drainage ability.In view of the defects in previous drainage systems，different systems are classified to improve the integrity and accuracy of the reliability analysis.
    Application of Acoustic Emission Cumulative Difference Indicator in Instability Prediction of Goaf
    MA Xiong-Zhong, WANG Wen-Jie, MO Huan-Dong, YE Peng
    2013, 42(07):  162-165. 
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    Acoustic emission cumulative difference indicator was proposed to evaluate the stability of underground engineering. The indicator takes into account of acoustic emission wave over a period of time, so it can predict the instability of goaf more accurately. Based on the grey theory, the GM(1,1) model of acoustic emission cumulative difference indicator is established, and applied to forecast goaf instability of the No.104 ore body in Fozichong Pb-Zn mine. The prediction has a good consistency with the actual situation.
    Structure and Property of Nano-TiO2 made from Ore Tailings Containing Titanium
    DENG Qiang, YANG Lin, BU Xian-Zhong, MENG Chang-Zhong, WANG Bing, CHEN Jing
    2013, 42(07):  166-168. 
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    Taking a low grade iron tailings of fine and refractory ibmenite from the reduction roast and low intensity magnetic separation from Guizhou as raw materials，high quality of Nano-TiO2 powder was prepared by the process of acidified roasting-hydrolysis. The structure of Nano-TiO2 powder was characterized by XRD，SEM，TEM and BET etc.，and its catalytic degrading performance on the 4-nitrophenol was evaluated with the refractory phenolic compounds 4-nitrophenol as object. The results indicated that the TiO2 2owder being prepared belongs to the nanometer anatase concentrate with the particle size of tens of nanometers; TiO2 powder appears in meso-structure with an average pore diameter of about 5 nm; TiO2 powder shows very good photocatalytic degradation on 4-nitrophenol，and the degradation rate is more than 60% within 240 min.