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Table of Content

    16 September 2013, Volume 29 Issue 09
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    Chelating Collector used to Floating Tungsten Ore Research Situation and Prospect
    TAN Xin, FAN Zhi-Hong, CHEN Ding-Zhou, LIU Long-Li
    2013, 29(09):  1-5+12. 
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    The types of commonly used chelating collector to floating tungsten ore were reviewed, some of the chelating collector working mechanism were analyzed, the application status of the chelating collector in floatation were introduced, the future development direction of chelating collector in floating tungsten ore were prospected, molecular design and synthesis method to design chelating collector by using CAMD techniques were proposed.
    Reseason on the Critical Damage Thickness of Isolated Pillars under Quaternary System
    YE Zhen-Hua, JIN Xiao-Gang, LIU Pei-Zheng, LU Chen-Yi
    2013, 29(09):  6-8+30. 
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    Confirming the thickness of the isolated mining pillars is the main important problem of openpit to underground mining and mining under quaternary system.Taking the mining engineering under quaternary system for an example,according to the disaffinity airport boundary conditions of isolated pillars and the form of damage mechanism of in the different stress condition,the MohrCoulomb and Tensile failure criteria are used to evaluate.The stress of inside the pillar unit is calculated by the FLAC3D software,and the safety coefficient method based on unit is put forward to calculate the safety coefficient of the isolated pillars.Finally,the reasonable thickness data of the isolated pillars is determined.
    Numerical Simulation Research on the Mining Feasibility of Ascending Isolated Island
    WANG Jia-Xiang
    2013, 29(09):  9-12. 
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    The work of mining at the isolated island face has always been a difficult field in the coal mine management. According to the general situation of 31706 isolated island mining face which caused by 3上 mining in Henan, the deformation situation of the mining strata of the isolated island and the stress distribution situation are analyzed by the UDED software ,combing with the actual condition on site.The research results show that, the whole structure is not sustain the destruction when mining at island face, and the stress of the coal wall for both sides decreased significantly, in the meantime, the island face is in the internal of depressurization area, which making the elastic potential energy to release in island face. Finally, it is verification that it is very feasible to mine at the isolated island face under the special geological conditions.
    Numerical Simulation Research on the Deformation and Stress Distribution based on FLAC3D Software
    MA Wei-Wei, CHENG Hong, YANG Yu-Xue
    2013, 29(09):  13-15. 
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    The mine's orebody of western area of the Fanshan phosphate rock occurred under the confined aquifer.In order to protect the mining stopes from being submerged by the confined aquifer from the fractured zone generated while mining. So,the filling method of the point to level of hierarchy pillars is adopted to mining in this area. The roof deformation and stress distribution of the stope is numerical simulated by the FLAC3D software,so as to guarantee the security of the stope mining.
    Research on the Application of the Loose Blasting Method in the Tunneling of the Changping Ore
    XIN Xian-Yao, LI Hong
    2013, 29(09):  16-18+59. 
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    The principle of the loose blasting method , the theoretical calculation and the situation of the engineering calculation are analyzed in detail.The application of the coal of the prevention and control of the loose blasting mining face and gas outburst technology in the experiment research on the Changping ore are introduced.The experimental data show that,the loose blasting method is good to prevent and control gas outburst and speed up the working face advance.
    Research on Mutual Influence of Two Ore Drop Shafts in a Copper Mine Hao YifanLv Dejie
    HAO Yi-Fan, 吕De-Jie
    2013, 29(09):  19-23+34. 
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    Since the ore drop shaft of a copper mine was built, sections have changed from circular to irregular shape and its size have changed from 3 meter to 20 meter. The maximum area nearly approach 300 square meters, and the sidewall distance between the two passes changed from 25 meters to about 13 meters. If the collapse is continued to happen,the danger of caving will be appeared. However,according to the production plan of the mine, the drop shafts have longer service life.Analysis of the stability of the drop shafts is done by numerical simulation method and some relative researches on the mechanism of the collapse process influence of drop shafts is done. Based on MohrCulomb failure criterion, the paper gave the emphasis on the analysis of stress state of surrounding rock changed in the sig3sig1 coordinate plane, getting the variation law of stress preliminarily established stable states of the passes which sets up the basis on later research of reinforcing and support of rocks.
    The Automated Processing Implementation of cross part of the roadway Based on AutoCAD Drawing Software
    QIN Kai, LIU Xin-Yang, LIU Dan, DONG Xue
    2013, 29(09):  24-26+37. 
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    The AutoCAD drawing software is widely used in many fields, however, it is so difficult for the basic functions of the AutoCAD drawing software to meet the drawing requirements under the actual conditions of some complex CAD questions or the professional design works.In the practical work, the spatial relationships of the coal mine tunnel plan is obtained not easily by manual processing method, and the same time, the workload is so huge. To deal with this questions, a set of automatic processing software is designed to gain the spatial relationships of roadway. Some related researched results proved that, the newly design software is goof for the work efficiency and technical level of the mine drawing workers. Moreover,this research results also conducive to the development of computeraided design.
    Beneficiation Tests of Recovery Iron from an Iron Tailings Gao Chunqing
    GAO Chun-Qing
    2013, 29(09):  27-30. 
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    Recycling iron tests on an iron tailing was conducted, according to characteristics of iron tailing from a old iron mine. Iron concentrate with yield of 22.12%, iron grade of 58.90%, iron recovery of 64.31%was obtained with the process of step grinding—low intensity magnetic separation + fine screening—high intensity magnetic separation—gravity separation, which provides a technical basis for development and utilization of this type of tailings.
    Tests of Direct Reduction—Magnetic Separation on a Bayer Red Mud
    LI Guo-Xing, WANG Hua-Jun, HU Wen-Tao, FENG Zhi-Yuan, ZHANG Kai-Lu
    2013, 29(09):  31-34. 
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    irect reduction—magnetic separation test were conducted on a bayer red mud. The effect of direct reduction temperature, direct reduction time, reducing agent dosage, CCO dosage, NCC dosage on the iron powder of its grade and recovery were examined. The optimum level of each factor was obtained through orthogonal test: direct reduction temperature of 1 200 ℃, direct reduction time of 2.5 h, coal dosage of 30%, CCO dosage of 15%, NCC dosage of 3%,and iron concentrate with iron grade of 91.34%, iron recovery of 88.36% was obtained in optimum parameters.
    Variable Fuzzy Theory Analysis of Operation Stability and Safety of Mine Ventilator
    WANG Yong-Feng
    2013, 29(09):  35-37. 
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    According to the laws of proportion,the mathematical translation method of fan characteristic curve is put forward.The characteristic curve of fan and angle of different blade are acquired quickly by measuring the fan performance curve or adopting the standard curve.The index system of mine ventilation operated safety and stability.This research results proved that ,variable fuzzy theory is used to analysis and evaluation the stability of the mine ventilation, to provide some basis for evaluating the stability of the mine ventilation system.
    Research on Optimization of Spontaneous Combustion of Coal Sign Gas in Phoenix Mountains Mine
    JIN Shu-Qing
    2013, 29(09):  38-40. 
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    According to the Phoenix mine Y type ventilation gobside entry retaining mining without coal pillar, a large quantity of air leakage, the rules of air leakage complicated, and spontaneous combustion of coal.In order to prediction of coal spontaneous combustion earlily, the selfdesigned “coal spontaneous combustion characteristic test system” is adopted to so some related research.The research results show that the mark gas system is acquired,an achieve a goo effect. It is necessary to explain that, the gas system contain CO of the 15# spontaneous combustion of coal,which is the main ingredients of the gas system,and C2H4 and C2H2,which are the less content of the gas system comparing with the CO.
    Analysis on the Reinforcing Effect of the Anchor Rope in Supporting Bearing Sun Tao1Shi Jihe2
    SUN Tao, SHI Ji-He
    2013, 29(09):  41-44. 
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    According to the characteristics of the semicircle arch roadway of mine straight walls, combining with the anchor net supporting and failure feature of the Ushape retaining instability, some related researched is done by numerical simulation softwares. The research results show that,the weak positons of supporting bearing can be structural reinforcemented by adopting the pretightening force of anchor cable. So, is is good for improving the overall stability and intensity of the supporting bearing.