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Table of Content

    15 August 2013, Volume 29 Issue 08
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    The Pre-splitting Blasting Experiment of End-slope
    WU Li-Ren
    2013, 29(08):  1-3+7. 
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    According to the actual mining conditions of the Bayan Obo open stope,combining of the currently ride valid data, the line density, aperture, hole pitch are used to do some research on the influence on splitting blasting under the same topography and geological conditions. The relationship between these parameters and the influence on splitting blasting respectively is analyzed.The experiment show that, in order to obtain the better effect of the slope splitting blasting, the smaller aperture, hole spacing should be used, and the inclined hole same as the design side slope rate should be adopted as much as possible.At the same time, the control of drilling quality must be pay more attention.
    Mining Scheme Design of Gushan Iron Mine Hang for Ore Ⅱ Stage
    CHENG Gao-Fu
    2013, 29(08):  4-7. 
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    According to the actual conditions of the Gushan iron mine hang for ore, the Ⅱ stage mining scheme is designed. The mining sequence, method, ventilation, drainage , filling,compressed air, moving boundary are designed and calculated. The scheme can meet the production requirements,the hang for mineral resources can be fully recycled and the iron ore output is increased, to ensure the mineral resources of the Gushan iron mine.
    Numerical Simulation Research on the Structure Parameter of Stope Based on Multifactor Orthogonal Design Method
    CHEN Hui, GUAN Wei-Ming
    2013, 29(08):  8-12. 
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    Taking the V# orebody of a certain copper mine as an example, some related numerical simulation research on the structure parameters of the stop by multifactor orthogonal design method is done, and obtains some indexes such as displacement, stress and plastic zone distribution. The multi-target fuzzy weight values is got, and the stability of stope evaluation can be caried out by the displacement and stress indictors so as to determine some reasonable structure parameters of the stope. This research achievement has important reference value on the similar mine problems and the problems of multifactor, multilevel, multiindex and pay a guiding role of mine safety production.
    Application of Wing Propulsion in the Treatment of Underground Turn to Open-pit Mine
    ZHOU Ke-Tong
    2013, 29(08):  13-16+19. 
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    According to the high risk area appearing in the process of underground ming turn to open-pit mining,under the condition of the caving method cannot be implemented security, the tie holes wing propulsion is used to deal with the gob, the purpose of safe and reliable is received. Taking the 1310 gob as an example, the implementation process of the tie hole controlled blasting is described in detail. It provides a new train of thought for the process method of gob, and has a high value on the future work in the field.
    Experiment of Reduction Roasting-Magnetic Separation on a Refractory Iron Ore
    GENG Chao, WANG Hua-Jun, FENG Zhi-Yuan, ZHANG Kai-Lu
    2013, 29(08):  20-22. 
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    Aiming at a refractory iron ore, mainly useful minerals are hematite and limonite, in Shandong province, by using conventional mineral processing methods can not effectively recover its iron. Under the conditions of bituminous coal ratio of 20%, limestone ratio of 25%, the reduction time of 2 h, the reduction temperature of 1 200 ℃, carried out reduction roasting-magnetic separation, iron minerals will be reduced to metallic iron, then through low intensity magnetic separation, iron grade of 92.38%, iron recovery of 92.36% was obtained.SEM analysis revealed iron exists in the form of metallic iron in iron concentrate。
    The Classification Techniques of the stability of surrounding rock of roadway based on RMR and BQ Method
    QI Jian-Dong, YE Yun, JIANG Zhong-An
    2013, 29(08):  23-25+29. 
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    Combining with the filed exploration data of the Xishimen iron mine and the experimental data of rock mechanics,the roadway engineering properties and other factors are con siderated comprehensively.Engineering quality classification and evaluation of roadway surrounding rock of three mining area in the south,middle and north mining area are carried out by means of RMR and BQ method respectively.Surrounding rock stability of various cola roadway is determined effectively.Therefor,this research result can provide some reliable scientific basis for taking mor economic and safe measure in this field.
    Analysis on the Impact of Backfilling Cementation Filling Method on the Stability of the Surface Buildings
    DANG Gao-Feng, ZHANG Zi-Chao, YANG Yu-Xue
    2013, 29(08):  26-29. 
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    Mining filling process is three dimensional simulation calculated by finite element simulation software. The results of numerical simulation is the same with the field measured data. The main technical index of the ming surface deformation is less than the I level building deformation. The impact of the surface displacement after backfilling mining cemented filling mining method on the ground building facilities is not tremendous. The stability of the surface structures can be guaranteed.
    中国矿业|对外投资|对策
    ZHANG Hua
    2013, 29(08):  95-97. 
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