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Table of Content

    15 April 2013, Volume 42 Issue 04
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    Research on Structural Parameters Optimization of Cementing Filling Stope for Super Large Underground Mine
    QIU Jing-Ping, XIN Guo-Shuai, ZHANG Shi-Yu, LIU Xiao-Bo, SUN Xiao-Gang, ZHANG Zhao-Ren, LI Jia-Ming, NIU Wen-Jie, CHEN Jin, WANG Rui-Xue
    2013, 42(04):  1-3+28. 
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    On the basis of establishing numerical model，the numerical analysis software，such as Ansys and Flac3D，were applied to optimize the parameters of stage height，ore block length，width and pillar width，combined with the lithologic conditions and filling body strength requirements of super large iron ore in Anshan Area. By comparison and analysis，the reasonable mining structure parameters were chosen to obtain the best mining effect，which provides scientific basis for the scheme determination of cemented filling mining in extra large underground mine.
    Ground Pressure Controls of Horizontal/Gently Inclined Ore-body on the Theory of Plates and Shells
    HUANG Gun, LUO Jia-Yuan, DENG Yu-Hua, ZHANG Xin, ZHANG Long
    2013, 42(04):  4-10+28. 
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    A model to relate the mechanical behaviour of roof strata overlying horizontal/gently inclined orebody is built with hard roof as elastic plate and based on the theory of plates and shells to obtain the maximum stress of roof deflection，bending moment and board. Combining with field observations，it is considered that the roof deflection can measure the supporting force. In the forming process of the roof deflection，the maximum loading may be generated at the regional support with largest deflection. When the stress generated is equal to or greater than the ultimate strength of the supporting body，this supporting body will be destroyed. Subsequently，this part of stress is gradually transferred into the surrounding supporting body. Combined with field observation and roof instability analysis，it is indicated that the closer to the roof，the faster the support damaged at maximum deflection region，or the worst.Therefore，according to the roof deflection that may appear，it is rational to arrange the pillar or make filling to realize the efficient control of the ground pressure and the optimal technique and economy.
    A Mining Engineering Stability Classification Method and its Application in Tunnel Support
    XU Meng-Guo, WANG Ming-Xu, WANG Ping, GAN Shi-Wei, CHEN Shun-Man, LUO Kai
    2013, 42(04):  11-14+23. 
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    The numerical model of a mining engineering stability classification is established. According to the safety coefficient classification from the numerical calculation results, the classification area map with the safety coefficient for - 430 m level mining area is drawn, and the -430 m level mining area is classified with RMR classification and Q classification. Combining with the two classification results, the -430 m level's rock mass classification area map with the safety coefficient is overlaid on that of the comprehensive rock mass to gain the engineering stability classification of -430 m level. Meanwhile, the tunnel support method with the corresponding engineering stability classification is given, thus providing a reference for right underground tunnel support.
    Wide Range of Pressure Monitoring Scheme and Preliminary Analysis in Jinchan No.2 Mine Area
    PENG Fu-Hua, WANG Hu, LI Shu-Lin, ZOU Long, ZHOU Qiao
    2013, 42(04):  15-18. 
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    Jinchuan No.2 mine area is an extra large underground mine in China.The underhand drift cemented cut and fill stoping with mechanized panel is adopted.The Jinchuan No.2 mine has large continuous exploit area and large annual output of ore. Additively，due to the relatively poor engineering geological conditions，large stress and other reasons，the ground pressure problem becomes more serious. This paper introduces the basic pressure monitoring program in No.2 Mine Area，the arrangement of the measuring point and its typical layout，monitoring methods and equipment etc.; Based on the existing monitoring data of rock mass stress and displacement，the data varies and its trends of the monitoring points are analyzed preliminarily. During the exploitation process of large mining area and level pillars，the influence to the rocks at Line No.14 air shaft and wide range of upper and lower panel are analyzed and evaluated，obtaining some achievements which play some guidance and reference value in safety production.
    Study on Floor Heave Mechanism and its Prevention and Control Technology of Horsehead
    MENG Chao, FU Li-Jun, CAO Shi-Chao
    2013, 42(04):  19-23. 
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    According to the geological conditions of horsehead surrounding rock of maiduoshan coal mine and the roadway deformation law after excavated，the mechanical characteristic of surrounding rock is studied，with some supporting problems exposed. In the light of the damaged feature of horsehead floor，it is considered that the floor heave is caused by floor strata curve，squeezed by the both sides of roadway，especially when it encounters with water. Based on the mechanism of and reasons for floor heave，some reinforcement measures including inverted-arch，floor bolt and bottom angle anchor，and floor grouting of surrounding rocks are taken to control the floor deformation. The on-site tests indicates that the floor deformation is effectively controlled through the measures above.
    Fuzzy Matter-element Evaluation for Ore-rock Stability in Chambishi Copper Mine
    ZHANG Jin-Jun, HU Wen-Da, WANG Yi-Ming, LIU Xiao-Hui, YANG Qing-Ping
    2013, 42(04):  24-28. 
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    Based on the fuzzy matter-element theory，a reasonable evaluation index of rock stability is chosen，and the fuzzy matter-element model of rock stability is finally built through the calculation of membership. In order to avoid the subjectivity of weight determination，the sum normalization method is adopted to determine the comprehensive weight of evaluation index，and then according to the calculating result of membership and the principle of maximum correlation degree，the multi-index comprehensive evaluation of stability grades for underground surrounding rock of Chambishi Copper Mine is realized. The results show that it is effective and feasible to evaluate the rock stability with fuzzy matter-element theory，and what's more，it offers a new thought to do this. Fuzzy matter-element|Stope stability|Membership|Evaluation index|Correlation Based on the fuzzy matter-element theory，a reasonable evaluation index of rock stability is chosen，and the fuzzy matter-element model of rock stability is finally built through the calculation of membership. In order to avoid the subjectivity of weight determination，the sum normalization method is adopted to determine the comprehensive weight of evaluation index，and then according to the calculating result of membership and the principle of maximum correlation degree，the multi-index comprehensive evaluation of stability grades for underground surrounding rock of Chambishi Copper Mine is realized. The results show that it is effective and feasible to evaluate the rock stability with fuzzy matter-element theory，and what's more，it offers a new thought to do this.
    Study on Large-scale Mining Technology of Mining Area II in 92# Pillar Group in Tongkeng Mine
    WAN Chuan-Chuan, CHEN He, LUO Xian-Wei, ZHOU Bing-Ren, SHI Fu-Wen
    2013, 42(04):  29-31+35. 
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    Due to mining activities over the years，several panel stopes surrounded by falling rocks were formed in the overlapping area of three orebodies in Tongkeng Mine. There are many difficulties to recover this kind of ore-bodies，and potential safety hazards exist in the whole mining process. Taking mining area II in 92# pillar group as a test case and with full use of the previous engineering，new projects are arranged in view of the falling conditions in surrounding mined-out area. Mining area II is extracted efficiently and safely with the induced caving method. Ground pressure activities are reduced in time. The research provides a reference for other stopes with similar mining conditions in Tongkeng Mine.
    Comprehensive Analysis of the Stability of an Actual-measured Mined-out Area
    ZHU Jian-Xin, TIAN Liu-Feng, ZHANG Yao-Ping, CHEN Shang-Bo
    2013, 42(04):  32-35. 
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    In order to obtain more reliable data on stability analysis of goaf，the 3d laser detector is adopted to detect the mined-out area to accurately acquire its 3D shape and distribution. Combining with the actual model with 3D mining software Surpac for mined-out area，the numerical analysis on the mechanics model is made with FLAC3D through the coupling technology. Finally，the monitoring results with the on-site photoelastic stress meter and the numerical simulation results are contrasted，and a comprehensive analysis and evaluation on stability of the mined-out area is made. This research can provide a theoretical basis for the subsequent safety production and management.
    Study on the Stochastic Law of Gob Stowing Effect
    GUO Li, HE Peng-Li
    2013, 42(04):  36-39. 
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    The cut-and-fill mining is one of the main parts commonly used in green-coal-mining system. No matter what kind of filling，the gob stowing cannot achieve an ideal effect in practice. The filling effect is random in certain scope. With the aid of stochastic finite element method，three situations of gob stowing consisting of full mining of coal seam with full backfilling，full mining with partly backfilling，and partly mining with partly backfilling，were analyzed. Through a lot of random calculation，it is shown that the surface settlement and deformation of the gob roof is more sensitive to filling effect. The most disadvantageous factors should be taken into consideration to guarantee that the filling effect should meet the design requirements as far as possible. The degree and range of variation in filling effect should be strictly controlled to ensure the filling to achieve the expected goal.
    Application of the Slicing and Caving Method to Diantan Shuicheng Fluorite Mine
    WANG Wen-Li
    2013, 42(04):  40-42+45. 
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    Diantan Shuicheng fluorite Mine with the capacity of 40 000 t/a is a small mine，and it is opened up by tunnels. Due to the fractured rocks and poor stability，some security accidents such as roof falling，caving and landslide always appear in the mining process. The mine is exploited by the slicing and caving stoping method. Through the tests，various technical parameters by this stoping method during exploitation of V1 ore body in Diantan Shuicheng fluorite ore are found out，including structural parameters，ore-body layout and applicable conditions etc.. Therefore，the slicing and caving stoping method fully suits for the recovery of Diantan Shuicheng fluorite ore Ⅴ1 ore-body.x
    Research of Goaf Roof Caving and Resources Intensive Integration During the Transferring from Open Stope into Caving
    SUN Jiang-Xian, WANG Xing, SUN Guo-Quan
    2013, 42(04):  43-45. 
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    Xiagao iron ore will transfer its mining method from open stope into pillarless sublevel caving method due to the production needs. But there appear many goafs under resulting from the original open stope method. The resources intensive integration and goafs roof caving technology are concerned during the transferring. In the research，the stabilities of current goafs are analyzed to identify the scheme of roof caving and intensive integration of remained resources. The research provides a certain reference for the intensive integration of remained resources and the roof caving of similar mines.
    Thoory Research & Application of Stope Pressure of Yonghua No.1 Mine
    ZHANG Fei, LIU Xiao-Chao, LI Jun-Feng, ZHANG Zheng-Wu, LIU De-Feng, ZHANG Heng
    2013, 42(04):  46-48+53. 
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    The appearance of the stope underground pressure can damage surrounding rocks and supports of the mine roadway，which influences the normal mining operation and production safety. Taking 2106 working face of Yonghua No.1 Mine as a engineering case，the theoretical calculation value of the pressure step distance of the mining pressure through comparing the theoretical calculation value of the pressure step distance of the mining pressure with field observation data，which can guide safety production of the stope face，and indirectly bring great economic benefits for coal mine.
    Influence of Temperature on the Mechanical Performance of Marble
    WANG Ran, ZHU Da-Yong, YAO Hua-Yan, LU Guo, PAN Peng-Zhi
    2013, 42(04):  49-53. 
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    The uniaxial and triaxial test under the action of different temperature (20，200 and 800 ℃) and the uniaxial test under temperature cycling are carried out by rock mechanics testing system RMT-150C. The mechanical properties of marble under the influence of different temperature and temperature cycling are analyzed systematically. The results showed that as the temperature increases，the marble characterizes as significantly plastic deformation，elastic modulus reducing and peak strain increasing. Compared with the samples at room temperature，the cohesion of the samples increases and its internal friction angle decreases after suffering 200 ℃; while the cohesion of the sample suffered 800 ℃decreases and its internal friction angle is the same as the samples at room temperature. The peak strength and elastic modulus of the sample decrease under increasing cycle heating times (200 ℃). As the temperature increases，longitudinal wave velocity decreases in different degrees. Compared with single heating，longitudinal wave speed decreases while the number of circulating heated adding，but the reduction is small. Both failure modes of samples at room temperature and those of samples suffered 200 ℃show single macroscopic cross-section shear failure; Part of the sample suffered 800 ℃ have many rupture surface; The temperature cycles does not have significant effect on the rupture form of the rock sample.
    Research on the Slope Synthetical Control with Blasting Vibration and Displacement Monitoring
    LI Chang-Cun, GUO Yan-Hui, WANG Chang-Jun, WANG Shi-Long, XIE Xing
    2013, 42(04):  54-56. 
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    First,discusses in detail the blasting vibration and the principles and rules of surface displacement monitoring. Then，taking Nanfen open pit mine as a engineering case，and combining with the double systems of blasting vibration and displacement monitoring，the high steep slope of the mine is continuously monitored. Finally，based on the evolution process of slope，the mining decision-making is adjusted effectively，which promotes the slope stability in mining engineering，and provides the technical guarantee for the continuous mining in safety.
    Research on Cemented Filling Technology with Fine-grained Full Tailings for a Shandong Mine
    YIN Bao-Chang
    2013, 42(04):  57-60. 
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    With the tailings from Sinosteel Shandong Fuquan Mining Co., Ltd. As raw materials, the cemented filling technology with fine-grained full tailings is investigated. Through tests analysis on the nature of tailings, tailings cementation and its slurry fluidity, the basic properties of the tailings are identified, and the appropriate types of cementitious material, the cementing process parameters and the transport conditions are determined. Meanwhile, the thickening tailings filling process is optimized.
    Numerical Simulation Research of Bolt Grouting Reinforcement to Jointed Rock based on FLAC3DKang
    KANG Zhi-Qiang, JIA Yu-Bo, ZHANG Yan-Bo
    2013, 42(04):  61-64+68. 
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    Through the mechanical derivation on bolt grouting reinforcement shearing resistance strength of the joint surface, the action mechanism of bolt grouting reinforcement in jointed rock roadway is obtained and the self-supporting ability of rock is enhanced by joint application of the anchor bolt and the grouting.The numerical simulation analysis on the jointing soft rock roadway with no supports and bolt grouting reinforcement is made by using the FLAC3D software.It indicated that bolt grouting reinforcement plays a significant role in improving jointing soft rock roadway force status and limiting roadway rock deformation.Therefore, it concluded that bolt grouting reinforcement is an effective supporting for the jointed rock mass.
    Research of Infrared Radiation and Acoustic Emission Feature of Granite during Fracturing and Water Seepage Process
    ZHANG Yan-Bo, CHEN Bin-Bin, JING Guang-Hui
    2013, 42(04):  65-68. 
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    By observing the uniaxial loading tests of a granite under water pressure with infrared radiation(IR) and acoustic emission(AE)，the characteristics of infrared radiation(IR) and acoustic emission(AE) of granite as loading and some abnormal phenomenon of infrared radiation(IR) and acoustic emission(AE) as granite fracturing and water seepage process are investigated. The experimental results show that with the stress increasing，IR radiation of the sample's surface rises evenly in early term，local high temperature in medium term，and low temperature in the late water seepage area. During the fracture and water-seepage process，the IR radiation indicates that low-temperature radiation field is surrounded by high-temperature radiation field. The anomaly features of IR radiation when granite rupture or seepage show that the infrared radiation reflects as “first increase and then decrease” at water seepage point; 32 ~ 128 kHz band is the characteristic band of acoustic emission signals as granite fracture and water seepage，and the band energy showed a trend of decline with percentage before seepage and declined to the lowest when water seepage occurs. The test results above is of great significance to remote sensing monitoring and early warning of flooding accident in the tunnel excavation process.
    Research on Control of Filler Stability in Underhand Mining with Super High-water Material
    ZHOU Shuai, FENG Guang-Ming, LI Jie
    2013, 42(04):  69-70+73. 
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    When the bag-type filling mining with ultra high water material is used,the filler is easy to be broken down towards rib during the underhand mining stage due to the impact of tilt role at working face. In order to overcome this problem，taking the No. 813 filling face of Shanxi Dazhuang Coal Mine as the research object，the reasons for instability of the filling body are analyzed with brief mechanical model，and the stability controlling method is proposed: adjusting the ratio of super high water，and strengthening the support of filling body. The first successful application of the underhand mining filling with super high-water material shows that the super high water material is a filling material with good performance which can overcome the instability problems of filling body in underhand mining conditions.
    Stability Analysis of Insulating Pillar in the Process of Mining Method Change
    REN Shao-Feng, CHU Fu-Jiao, SONG Hua, WANG Yu-Jie, REN Gao-Feng
    2013, 42(04):  71-73. 
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    Insulating pillar plays an important role in the stability maintenance of mine during mining. During the process of mining method change with the mining depth increasing，the limit equilibrium method is used to calculate out that the thickness of insulating pillar is 10 m according to the field engineering condition of a mine. With the use of 2D numerical calculation software RFPA，the mine stability is analyzed and the result shows that the 10-meter thickness insulating pillar can maintain the stability of stope and meet the demand of mine production.
    Beneficiation Experiments of a Low Grade Vanadium-titanium Magnetite Ore
    WANG Wei-Zhi, LI Ming-Yan, HAN Dong-Yun
    2013, 42(04):  74-76+85. 
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    In order to provide the technical basis for the development and utilization of a low-grade vanadium-titanium magnetite ore, beneficiation tests on comprehensive recovery of iron and titanium are made. The results show that iron concentrate with Fe grade of 64.42% and recovery of 55.42% is obtained by adopting the process of two stages grinding-stage low intensity magnetic separation from the raw ore. Tailings are treated by the open-circuit process of rough concentration with spiral chute-one cleaning with table. Then, titanium concentrate with TiO2 grade of 33.88%, and the recovery of 32.83% by gravity separation and the recovery TiO2 of 27.78% of the raw ore are obtained. The product can be sold as raw materials of protecting the furnace.
    Tests of Concentration Optimization for a Low-grade Copper-nickel Sulfide Ore in Jilin
    YIN Wan-Zhong, MA Ying-Qiang, SUN Hong-Shuo, WU Hao, ZHANG Li-Li, LU Huan-Huan
    2013, 42(04):  77-81+85. 
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    In a copper-nickel ore concentrator of Jilin, the process of washing-gravity separation-flotation for the undersize products by 18 mm screening and the process of crushing-grinding-asynchronous flotation-gravity separation for oversize products are adopted to handle the low grade sulfide copper-nickel ore.Even if these processes are complicated and long flow, the efficiency of concentration is low.So the ore beneficiation process was optimized.The results showed that with the simple asynchronous flotation process for the ore, copper-nickel mixed concentrate with Ni grade of 7.47%, Ni recoveries of 82.57%, Cu grade of 2.19% and Cu recovery of 91.74% were obtained under the grinding fineness of -0.074 mm 70%.Compared with the on-site tests, the process and the pharmaceutical system have been greatly simplified, and the Cu, Ni beneficiation efficiency were increased by 13.90% and 5.49% respectively.The research provides a basis for the technical transformation of the site production process.
    Controlling the Carbothermic Reduction Sequence of Ferric Oxide through Thermodynamic Multifactor Coupling
    BU Lin-Chao-Ke, ZHANG Bang-Wen, ZHAO Rui-Chao, XING Rui-Guang, ZHANG Qi-Wei, ZHANG Yin
    2013, 42(04):  82-85. 
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    In view of the significance of realizing the carbothermic reduction sequence of Fe2O3→Fe3O4→Fe for ferric oxide, the thermodynamic multifactor coupling including stored energy，total pressure，partial pressure of inert gas as a new thought were put forward, and the quantitative relation satisfied by the thermodynamic parameters as an indication of multifactor coupling was deduced. Furthermore, how to decrease the stored energy for carbon on the basis of the quantitative relation for energy conservation was discussed from the view of energy saving. The results show that on the premise that the partial pressure of inert gas(or total pressure) is fixed, stored energy for carbon required for realizing the above sequence can be decreased even to zero by regulating the value of total pressure(or partial pressure of inert gas) within certain range.
    Experiments of Preliminary Decarburization and Heat Sulphidizing Flotation Processing for a Semi-oxidized Copper Ore from Guangxi
    HU Ming-Zhen, WU Bo-Zeng, CHEN Jin-Quan, BU Xian-Zhong
    2013, 42(04):  86-89. 
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    A certain copper ore in Guangxi has the copper oxidation rate of more than 27%, and contains about 1% of the carbonaceous matter.It belongs to the refractory semi-oxidized copper ore.The direct flotation process at room temperature was selected to handle this kind of ore by the concentrator, and copper concentrate with the copper grade of only about 18% and recovery of less than 60% was obtained.In order to provide the basis for transformation of the on-site process, and taking sodium sulfide as vulcanizing agent and the combination of butyl xanthate + DY as collector, experiments of the preliminary decarburization and heat vulcanization process at 60 ℃ were carried out, obtaining copper concentrate grading at 20.57% with Cu recovery of 62.75%.Compared with the on-site production, the beneficiation indicators have been significantly improved.
    Experimental Study on Mineral Processing for a Copper Polymetallic Ore in Sichuan
    LI Cheng-Xiu, WANG Chang-Liang, DAI Xin-Yu, RAO Xi-Ying
    2013, 42(04):  90-93+112. 
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    Besides of copper, a copper polymetallic ore in Sichuan is also associated with molybdenum, sulfur cobalt and iron. In order to make rational and effective use of the ore, the beneficiation test researches are made. The results show that the efficient recovery of copper is achieved and the comprehensive recovery of molybdenum, sulfur cobalt and iron is also realized by adopting the process of copper-molybdenum mixed flotation-the flotation of copper and molybdenum-sulfur cobalt concentration from tailings by mixed floating-iron concentration from tailings by low intensity magnetic separation. By this method, copper concentrate with Cu grade of 21.25% and Cu recovery of 93.38%, molybdenum concentrate with Mo grade of 45.78% and Mo recovery of 45.72%, sulfur cobalt concentrate with S grade of 44.69% and Co grade of 0.46% and S recovery of 41.53% and Co recovery of 46.42%, and iron concentrate with Fe grade of 63.73% and Fe recovery of 38.29% are obtained respectively.
    Preparation of Organic Clay with Activated Clay
    ZHANG Xiu-Ying
    2013, 42(04):  94-96+112. 
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    Organic clay was prepared by the reaction of activated clay with cheap stearic acid. The effects of the dosage of stearic acid, reaction temperature and reaction time on the content of organics in the organic clay are investigated. The results show that the under the conditions of mass ratio of stearic acid of 60%, the reaction temperature at 60 ℃ and reaction time for 2 h, the organic clay with the organics of 28.9% was produced. The XRD and FTIR analysis on the product indicated that the stearic acid has been intercalated into the crystal inter-layers of montmorillonite and expands the interlayer distance of Montmorillonite for 0.79 nm.
    Magma Intrusion Times and Mineralization of Jiudingshan Copper-Molybdenum Polymetallic Deposit
    JIANG Hua, ZOU Guo-Fu, HE Xiao-南
    2013, 42(04):  97-100+105. 
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    Based on research of ore-body characteristics，mineralization characteristics and mineralization of composite porphyry in Jiudingshan copper-molybdenum deposit district，the porphyry magma activities in Jiudingshan is preliminarily divided into three phrases. The first phrase consists of syenite porphyry and quartz syenite porphyry；the second phrase includes the combination of porphyritic granite and lamprophyre (a)；the third phrase is the combination of granite porphyry and lamprophyre (b)；Among these，the first and the second phrases are closely related with the mineralization. In accordance with the ore-hosting surrounding rocks，the ore deposit is divided into four types of porphyry ore，skarn ore，hornfels ore and lamprophyre ore. According to the ore-forming elements，the deposit is divided into molybdenum ore，molybdenum-copper ore，copper ore，magnetite ore and gold ore. Copper and molybdenum mineralization is closely related with the quartz-K-feldspar zone and the quartz-sericite zone.
    Extraction of Metallogenic Information and Prospecting Prediction Based on Landsat TM in Gejiu Tin Deposit Area
    TAN Shu-Cheng, HU Xiong-Gang, JIN Yan-Zhu, CHEN Jian, CHEN Feng
    2013, 42(04):  101-105. 
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    On the basis of studying mineralized geologic environment，geologic feature and metallogenic regularity of the Gejiu Tin deposit located in Yunnan province，and Landsat TM multispectral image data used as basic information source，the remote sensing prospecting is adopted to extract geologic structure information and alteration anomaly information of Gejiu deposit. Then，with comprehensive use of the achievements in geological，geophysical and geochemical exploration，and combining with the field survey，three kinds of (9 in total) ore-prospecting areas are delineated.
    Technical of Large-scale Optimization of Prospecting Targets Base on ArcGIS
    LI Yang, ZHAO Xin-Sheng, CHEN Chuan
    2013, 42(04):  106-108+130. 
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    Together with the use of GIS software in ArcGIS platform to arrange field work，combining with the prompt geophysical and geochemical prospecting measurement，ArcMap software is used to comprehensively deal with the data above to aim at locating the large-scale prospecting target promptly and accurately. The whole working progress has been proved to be successful through practices in certain mining fields. Therefore，this method is recommended for better promotion and wider use.
    Study and Application on Truck Tire Selection for Open Pit Mine
    ZHANG Guang-Chao, LI Ke-Min, MA Li, XIAO Shuang-Shuang
    2013, 42(04):  109-112. 
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    Based on the application of set-pair analysis method and combining with maximizing deviation method to determine the weights，an evaluation model for the truck tire used in open pit is built. Here，twelve factors are chosen as the evaluation index，including road adaptability，climate adaptability，maximum load，maximum transport speed，barometric pressure，TKPH，tire rubber，service life，tread type，manufacturer credibility，after-sales service and tire price. Finally，through analyzing the open-pit mine，the model above is applied to assess the optional tire scheme to finally obtain the optimal solution which is consistent with the result from the correlation analysis. The case verifies the practicality and reliability of the model. 
    The Impact of the Bulk Materials Grain Composition to the Transport Capacity of Belt Conveyor
    YE Hai-Wang, JIANG Xin
    2013, 42(04):  113-115. 
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    The decisive factors of belt conveyor's transport capacity are analyzed. The model that bulk materials loads on the belt and achieves mechanical equilibrium is established by using the discrete element numerical simulation method. According to research of several groups of bulk materials with different grain composition，the influence of the mean particle size，the range of particle size on the belt conveyor transport capacity is analyzed. The result shows that the bigger the mean particle size is，the bigger the ratio of maximum particle to minimum particle is，and the bigger the area of the cross section of bulk solid loading on the belt conveyor is. Therefore，the belt conveyor owns a larger transport capacity.
    Study on the Visualization of Mine Ventilation Network by Using Graph Algorithm
    WANG Xiao-Dong, HU Nai-Lian, TAN Hai-Lin, ZHAO Xiao-Jie
    2013, 42(04):  116-121. 
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    Based on analyzing the solution of ventilation network topology structure, the structural characteristics of branches, nodes and weights in the network diagram are studied, the mathematical model of adjacency matrix and incidence matrix is introduced, and the algorithm of the branch node number and weighting value is proposed with the integrated application of theoretical knowledge of graph theory and mine ventilation.After finishing the automatic numbering of nodes on the complex ventilation network diagram in three-dimensional state, the vector operations is carried out based on the number and ventilation solver results, then the results are assigned into three-dimensional network diagram.Mapping problems between the each branch and the wind network data in three-dimensional network diagram of the mine ventilation are solved.The actual data in a mine confirms that this method is feasible.
    Quick Decision-making Method of Ventilation System Based on Fuzzy Similarity Priority Ratio Method
    XIE Zhen-Hua, LI Zheng-Tao, YANG Jing
    2013, 42(04):  122-124+127. 
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    According to the production status of metal mine，a quick decision-making method of ventilation system based on fuzzy similarity priority ratio method is presented and its application range is illustrated. With the combination of its application in ventilation，the paper describes the mathematical principle of this ventilation decision-making method and explained the related physical meaning in these mathematical models. Lastly，the fuzzy similarity priority ratio method is adopted to determine the temporary modifying ventilation scheme of -16 m level for an iron mine belonging to Shouyun mining company which has transferred from open pit to underground mining to illustrate the practical application process.
    Influencing Factors Analysis of Overburden Seepage Discharge with Caving Method from Open Pit to Underground Mining
    WU Yong-Qiang, SUN Yan-Qiu
    2013, 42(04):  125-127. 
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    With the caving method from open pit to underground mining，the overburden seepage discharge in the open pit relates to the safety of underground mining. Through the analysis of rainfall intensity，the catchment area of the open pit and the structural characteristics of overburden，the relationship between these factors and the seepage discharge of open pit overburden is studied，which is of great significance to reduce the underground water and ensure the mining safety.
    Dust Control and Removal Technology at Fully Mechanized Workface of Changling No.1 Well
    PI Xi-Yu, ZHANG She-Ji, XU Bang, ZHANG Lang, Sun-Xiao-Jun
    2013, 42(04):  128-130. 
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    The airflow is divided into the jet zone，reflux zone and vortex zone from the air outlet to the fully-mechanized workface. Combining with the status quo of dust generation and dust prevention and control in fully-mechanized workface of railroad 152101 of Changling No.1 well，a comprehensive dustfall process combining of dust control with air duct and dust removal and purification with dust collector is designed to make the total dust and the respirable dust fall efficiency reach above 90% and 80% respectively in the fully mechanized working face. By this method，the working environment will be greatly improved in working face and the health of the workers and the production safety of the mine be protected.
    Gas Drainage Technology with Large Diameter Progressive Buried Pipe
    HUI Gong-Ling, SONG Jin-Hu
    2013, 42(04):  131-136. 
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    The paper focuses on solving the engineering poser of gas emission in the protective seam face exploiting process of Twelfth Mine Ji14-31010 of Pingmei Tian'an Corporation Ltd. With combination of gas and geological condition，for the possible of gas exceeding limit in the mining process of protection layer，the large diameter progressive buried pipe drainage technology is proposed to solve the gas exceeding limit in the mining process. Then the numerical calculation analysis for gas migration in the drainage of goaf is carried out to determine that the reasonable space between buried pipe and drainage pipe diameter is 40 m and 300 mm respectively. Finally，the specific progressive buried pipe with large diameter drainage program is given，which is practiced in the field. Monitoring data in the exploiting process show that the gas drainage by scalar is 29.1~35.3 m3/min，the average gas density is 13.7%，the average gas density in upper corners is 0.51%. And the phenomenon of gas concentration exceeding limits does not appear. This confirms that the puzzle of gas emission in the exploiting process of protective seam face can be rationally solved with the large diameter progressive buried pipe drainage technology.
    Further Improvements of the New Underground Artificial Refrigeration System
    REN Sen
    2013, 42(04):  137-138+146. 
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    Major improvements to the new refrigeration system previously proposed are made. Removing the original heat exchanger bags and the serpentine pipeline make the system simplified. And transferring the contact heat with two different media into all-around mixed heat exchanger of the same medium can greatly improve the efficiency of heat transfer. The improved system need an exhaust machine and the related equipment based on the traditional air compression refrigeration device，in order to make a full circuit. Although the cost increases，the system becomes more simple and reasonable.
    3D Seepage Analysis of a Tailings Dam
    ZENG Xiao-Xiang, HU Xun
    2013, 42(04):  139-141+146. 
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    In view of specific conditions of some tailings dam，three-dimensional finite element simulation method and the computing of seepage field distribution were adopted to fix the features of 3D seepage line depth of tailings dam under ideal conditions of a generalized model; Through analyzing the structural parameters' sensitivity of the seepage drainage，the main factors for impacting the dam seepage line depth were determined. The simulation showed that under the normal working of each drainage structure in function，the depth of tailings seepage line at tailing sub-dam is 15 m below，which is higher than the required value by the specification.
    Study on the Height of Water Flowing Fractured Zone in Containing Vanadium Shale Deposit
    MA Zhi-Wei, YE Yi-Cheng, WANG Qi-Hu, LIN Kun-Feng
    2013, 42(04):  142-146. 
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    The discrete element numerical simulation on the exploration of multi-layer vanadium-containing shale deposit of Shanghengshan is carried out. And the development curve of the height of water flowing fractured zone with four factors of mining depth，dip angle of orebody，sublevel height and mining thickness is obtained based on the estimation. The paper designs the orthogonal experiment of numerical simulation with four factors and three levels. By making the range analysis of the orthogonal experiment，the impact levels of the four influencing factors to the height of water flowing fractured zone have been ranked as: dip angle of orebody > sublevel height > mining thickness > mining depth. The comparative analysis indicated that it is lack of rationality to apply the empirical formula for the height calculation of water flowing fracture development in testing into the height calculation of water flowing fractured zone for multi-vanadium-containing shale. A multi-factor prediction function for the development height of water flowing fractured zone is built by considering the range as the weight of each factor influencing on the development height of water flowing fractured zone，and combining with the estimated results from the curve.
    Preparation of a Multi-phase Foamed Gel for Underground Fire Prevention Fire Control
    ZHANG Lei-Lin, MAO Tao-Liang, QIN Bo-Tao, SHEN Hong-Min
    2013, 42(04):  147-150. 
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    With four kinds of foaming agent (F1, F2, F3 and F4), the thickener H, the cross-linking agent AL and fly ash from Datun Coal and Electricity Company as raw materials, the multiphase gel foam for the underground fire prevention of coal mine is prepared, focusing on studying the proportion and dosage of foaming agents, the mixture ratio and dosage of thickener H and cross-linking agent Al, and influences of different foaming (foaming by mechanical stirring and foaming by compressed nitrogen) on the foam properties of materials. The results show that under the conditions of the mass ratio of F1 and F3 at 1∶1, the mass ratio of complex foaming agent and water at 4‰, the mass ratio of thickener H, cross-linking agent AL and water at 3‰, and the water-cement ratio of 5∶1, the multiphase gel foam with highest performance is produced by the compressed gas foaming.
    Removal of Sulfide from Mineral Processing Wastewater of Fankou Lead-zinc Mine by Modified Coal Gangue
    ZENG Mao-Hua, LONG Lai-Shou, LI Zai-Bo, ZHAO Xu-Guang
    2013, 42(04):  151-154. 
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    With the waste coal gangues of an abandoned coalmine in Shaoguan as the main raw materials, the modified coal gangues A, B, C were prepared. These three modified gangues together with the unmodified gangues are used to make laboratory tests for removal of sulfide from the wastewater of Fankou Lead-zinc Concentrator. The results showed that the modified gangue A has a higher ability to remove the sulfide and the appropriate conditions for sulfide removal include the room temperature, the original pH value of wastewater, the gangue dosage of 2.0 g/L, stirring speed at 300 r/min and reaction time for 60 min. According to the results of laboratory tests, modified coal gangue A was adopted into the pilot plant tests to remove sulfide from the beneficiation wastewater in Fankou Lead-zinc Mine. By this method, the removal rate of sulfide reached above 87.5%, and the concentration of sulfide dropped to 0.42 mg/L below, which meet the national and Guangdong Provincial discharging standard.
    Preparation of Autoclaved Aerated Concrete made by Iron Ore Tailings in Nanqi Iron Mine
    LI De-Zhong, NI Wen, ZHENG Yong-Chao, CHEN Wei
    2013, 42(04):  155-158+163. 
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    The autoclaved aerated concrete(AAC) was prepared with iron ore tailings(IOTs) from Nanqi Iron Mine of Shanxi Lingqiu County as siliceous materials, cement and lime as calcium materials.The formulations of AAC were optimized by the orthogonal tests, and the products prepared are analyzed from its mineral composition and microstructure with XRD and SEM.The results showed that under the optimal formulations of the mass fractions of iron tailings, cement, lime and gypsum at 61%, 10%, 23% and 6% respectively, the mass ratio of aluminum powder to 4 kinds of raw materials at 0.55 ‰, and the water to materials ratio at 0.57%, the autoclaved aerated concrete with the compressive strength and the bulk density of 4.83 MPa and 596 kg/m3 was produced, which met the requirement of A3.5 and B06 level qualified product.The major phases in the AAC product are tobermorite, CSH gels, and also some gypsum and residual quartz from tailings.
    Analysis of the Influences of Activator on Performances of Jinchuan Water-granulated Secondary Ni Slag Cemented Backfilling Materials
    WANG Jia-Jia, LIU Guang-Yu, NI Wen, GAO Shu-Jie, WANG Zhong-Jie, ZHANG Fu-Li
    2013, 42(04):  159-163. 
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    The water-granulated secondary Ni slag produced by iron increase with the smelting reduction of Jinchuan nickel smelting slag is made into cemented materials with desulfurization gypsum and carbide slag as main activator and sodium sulfate and cement clinker as auxiliary activator. Then together with milled sands at the cement-sand ratio of 1∶4, the cement materials with the mass fraction of 79% are produced so as to study the effects of activator's dosage on strength of cemented materials. The results show that when the mass fraction of the water-granulated secondary Ni slag, gypsum, calcium carbide slag, sodium sulfate and cement clinker in the cemented materials are 85%, 5%, 5%, 3% and 2% separately, the comprehensive strength and bending strength of the cement materials at 28 d reach 3.42 MPa and 1.96 MPa, which meet the strength requirements of the underground filling binder. It is observed by means of XRD and SEM that under the reaction of activator the glass phase and crystalline mass in the secondary nickel slag cementitious materials can occur the hydration reaction, and the main hydration products are ettringite and silicate (aluminate) gel containing Ca2+ and Mg2+.
    Enhancing Pelletizing Tests of Steel Plant Dust
    HUANG Zhu-Cheng, LI Tie-Hui, YI Ling-Yun, JIANG Tao
    2013, 42(04):  164-168. 
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    According to the actual produced dust in a steel plant, four kinds of steel plant dusts are mixed with fibrosis bentonite prepared by the Central South University with patented technology at cue ball growing stage to strengthen the palletizing. The new pellet is compared with the conventional palletizing. The test results showed that for each kind of cue ball with ordinary bentonite dosage of 0.5%, 1.0%, 1.5%, 2.0%, the enhancing pelletizing can significantly improve the performance of the pellets. Taking the cue ball with ordinary bentonite of 2.0% for example, the enhancing palletizing contains the total amount of bentonite increased by only 0.05% compared with the conventional pellets, while the green ball owns the drop strength and compressive strength from 18.3 times, 19.2 N/P to 21.2 times, 21.7 N/P respectively, and its explosion temperature is increasing from 240 ℃ to 274 ℃，the compressive strength and of the dry ball rise from 68 N/P to 76 N/P and its pulverization rate decreases from 0.78% to 0.51%, which totally meet the quality requirements of rotary hearth furnace reduction process.