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    11 January 2012, Volume 28 Issue 01
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    LIU Yu
    2012, 28(01):  1-3+7. 
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    Application of 3DMine Mining Industry Engineering Software on Wuwei Mine 3d Visualization Model Construction
    CHEN Jing-Wen, WU Zhong-Xiong, CHEN De-Yan
    2012, 28(01):  4-7. 
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    3d Mine visualization model technology has entered a new development stage with the rising of digital mine. Mining area ground model, orebody model and roadway model were constructed in Wuwei Mine by using 3d Mine mining engineering software. Mine ground terrain, orebody space form, shaft and tunnel engineering arrangements and spatial position relation would be understood more visually by means of 3d visualization model, would be helpful to mining and development methods optimal selection and mine engineering optimized arrangement, has important significance to mine safe production, reasonable utilization of mine resources and mine long-term development.
    Research on the Reasonable Thickness of Cover Layer at Goaf under Condition of Open-underground Combined Mining based on Ansys
    FEI Peng-Cheng, SONG Zi-Ling, WANG Dong, WANG Rui-Xue
    2012, 28(01):  8-10. 
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    Stability of overlying strata at goaf under condition of open-underground combined mining had been a key issue in mining engineering technology. Practice situation of a mine in Ordos were analyzed and calculated by using KB LuPeinie theory estimation method, structural mechanics theory calculation method, Platts arch theory estimation method and numerical simulation method, numerical simulation was done on different goaf span and top plate thickness, though combine of several calculating methods and practice production situation, reasonable minimum safe thickness value of overlying strata at different goaf span was obtained, provided reference for reasonable goaf overlying strata thickness design of mine, had important guiding significance for safe production of open-underground combined mining.
    Analysis of Instability Mechanism Ore Hauling Tunnel in Lanjian Iron Mine 1#、3# and Engineering Control
    DIAO Hu
    2012, 28(01):  11-14. 
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    To the instability phenomenon appeared at haulage tunnel local section of a mine, simulation was done by using finite element numerical, effects from continuously decreased mining level, open pit blasting vibration were considered, combining prestressed anchor cable and steel arch support effect were analyzed, provided a certain reference for similar tunnel analysis.
    Effect of Excavation to Mengxi Coal Mine Conveying Tunnel Surrounding Rock Deformation
    ZHANG Zhen-Dong, ZHANG Wei
    2012, 28(01):  15-17. 
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    In order to reveal the effect of excavation to surrounding rock deformation, Mengxi coal mine conveying tunnel was simulated by adopt finite difference method, and the three-dimensional model was set up, the figure of plastic zones , displacement and stress distribution of conveying tunnel was obtained by step 1,3,5 analysis. Research results indicated, excavation was one of the influence factors to surrounding rock deformation, provided theoretical basis for theoretical design of supporting scheme and practical application of engineering.
    Experimental Study on a Comprehensive Recovery of Iron, Copper, Sulfur from a Certain Tailing
    WU Xia, WANG Yu-Feng, HU Ding-Bao
    2012, 28(01):  18-22. 
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    In order to make an effective recovery of such valuable elements as copper, sulfur and iron etc. from tailings of Nanjing Iron & Steel Company, the flotation tests on these tailings are made. Good comprehensive recovery index are obtained, including copper concentrate with copper grade of 10.31% and recovery of 46.44%, sulfur concentrate with sulfur grade of 37.46% and recovery of 75.43%, and iron concentrate with Fe grade of 65.72% and recovery of 13.28%.
    The Effect of Inorganic Inhibitors on Separation of Lead,  Zinc and Sulfur in Low Alkalinity Condition
    HUANG You-Cheng, ZHAO Li-Bing
    2012, 28(01):  23-29+46. 
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    A copper-lead-zinc mine in Sichuan belongs to the multi-metal sulfide with the feature of easy to concentration but difficult to separation. Silver associated with the minerals are mainly enriched into lead concentrate in dressing process to realize a comprehensive recovery. Due to a large number of pyrite existing in minerals, it is easily floated with the activation of copper ions generated by secondary copper sulfide, which makes lead-zinc-sulfur difficult to separate. For these problems in production, a series of lab tests, small closed-circuit tests and industrial tests are contrasted starting from choosing inorganic inhibitors. The combination of inorganic inhibitors——ZnSO4 YD was ultimately found out with a better suppression on pyrite, and its flotation mechanism was analyzed as well.
    Flotation Test Research of a Gold Mine
    DU Fei-Fei, YANG Zhi-Jun, GUO Cun-Feng
    2012, 28(01):  30-34. 
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    The explorative experiments on a gold mine mainly consisting of pyrite and chalcopyrite with gold grade of 1.53g / t are made to focus on the recovery of  sulfide metal minerals and to determine the flotation conditions by combining sodium carbonate pulping with Ammonium dibuyldithiophosphate + butyl xanthate. The optimum conditions with grinding fineness of -200 mesh 65.05%, the dosage of sodium carbonate 1 000 g / t, the ratio of ammonium dibuyldithiophosphate and butyl xanthate of 1∶3 at the dosage of 60 g/t are got from the testing. In open-circuit tests, the process of one-roughing, three-cleaning and one-scavenging is adopted, but the higher gold grade results in high gold grade in tailings. Hence, the closed-circuit test process of one-roughing, two-cleaning and two scavenging is adopted, obtaining flotation gold concentrate with Au grade of 70.26 g / t and gold recovery of 92.30%.
    3D Simulation and Optimization Model of Mine Ventilation Network
    HUANG Hua-Yue, HU Ming-Zhen
    2012, 28(01):  35-38. 
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    Aiming at characteristics of many roadway, complicated ventilation status of a big mineral zone, space figure mutual conversion and ventilation network solution methods were adopted. Ventilation network 3D graphic, simulation data and ventilation network calculation models were set up. Mine ventilation network 3D simulation graphic modeling, automatic dimensioning and ventilation network solution were solved.and the theories and technical guarantee were provided for realization of high level intellectualization and automatization of mine ventilation network 3 D simulation and ventilation network calculation, mine digitalization construction and safe production.
    Evaluation of Water Quality of Mining Area River based on AHP-Fuzzy Method
    YAN Tao, CHEN Qing-Bo
    2012, 28(01):  39-41+57. 
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    Based on summary of exist mine water quality evaluation methods, an AHP-Fuzzy evaluation method was proposed reasonably in Yichang Yiling mining area main river water quality evaluation. Results indicates, this method was simple in calculation and had good reasonableness and reliability which could be widely used in mine water quality evaluation.
    A Method to Enhance the Underground Image
    LI Wen-Feng, JIANG Min-Xia, XU Ke-Qiang, LU Jun
    2012, 28(01):  42-44+49. 
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    Aiming at underground mine light uneven, much noise was interfused in S3C6410 field information recorder during collection and transmission of image, the picture was fuzzy and contrast ratio was low. Noise source of this system collection port was analyzed, several classical wavelet threshold de-noising method were compared based on wavelet threshold de-noising theory proposed by Donoho, de-noising effect of peak signal noise ratio was obtained, image enhance method of adaptive wavelet threshold de-noising and histogram modification combination was proposed. The performance was good and the image quality was improved with noise removing from CCD camera.