Table of Content

15 June 2012, Volume 28 Issue 06

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Analysis on Elements of the Overseas Mining Investment Decision System

ZHENG Ming-Gui

2012, 28(06):  1-4. 

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Characteristics of mining investment, main content and stage division of mining investment decision, basic and risk elements of overseas mining investment division were analyzed systematically. It provides references for overseas mining investment decision maker.

Application of Energy Analysis in Blasting Vibration Monitoring

YUAN Shao-Guo, HUANG Gao-Lei

2012, 28(06):  5-7+20. 

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Since conventional blasting vibration monitoring method only consider the single factor of vibration peak speed, and it could not evaluate the damage degree of blasting seismic effect well. Blasting vibration monitoring results were analysis by time-energy density analysis which based on wavelet packet analysis technology, and comprehensive and precise evaluation was made on blasting vibration effect based on comprehensive consideration of vibration velocity, frequency and lasting time. This method can overcome the shortage of conventional method, and it has certain guiding significant to blasting operation of open-pit mine. Wavelet packet analysis|Time-energy density analysis|Blasting vibration monitoring|Wavelet packet de-

Research on Bearing Pressure Evolution Law of Section Pillar Middle Tunnel

ZHANG Yan-Li

2012, 28(06):  8-11. 

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Taken the section pillar middle tunnel of a coal mine in Huangling as an example, similar simulation experiment method was adopt to analysis the stress distribution law of coal pillar after full mining and stress distribution characteristic of opposite side pillar during tunnel excavation process in one side pillar, and the deformation and failure law and stress distribution situation of overlying strata were discussed. The test results indicates that inverted triangle structure formed after working face mining and tunnel excavation in one side pillar were the main reasons for stress increasing of opposite side pillar. Meanwhile, destruction line of overlying strata after pillar buckling collapse was obtained, and it has a certain guiding significance to tunnel support.

Ore Dressing Experiment of a Copper Sulphide Ore of Xinjiang

LI Jia-Yu, YAO Fei

2012, 28(06):  13-16. 

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Based on ore property, valuable elements of copper and sulfur are contained in a copper sulphide ore of Xinjiang, and could be recovered through flotation. Therefore, copper sulfide mixed-separating flotation process experiment was done, under the condition of grinding fineness -0.074 mm occupied 60 percent, water glass took as regulator and amount 350 g/t, Z-200 took as collector and staged amount was （35+25）g/t, lime amount 2 000～3 000 g/t and through once roughing twice scavenging and twice regrade, copper sulfur concentrate was gotten, copper concentrate of copper grade 23.55% and recovery rate 93.76% and sulfur concentrate of sulfur grade 38.84% and recovery rate 52.37% were obtained through once roughing once scavenging and twice regrade copper and sulfur separation, technical indexs of experiment were good.

Experiment of Beneficiation Process of a Lead Zinc Mixed Concentrate in Sichuan Province

YANG Cheng-Shu, YANG Xiao-Jun, HE Jian, MAO Su-Rong

2012, 28(06):  17-20. 

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Took a lead zinc mixed concentrate of Sichuan which containing lead 0.85% and zinc 6.53% as the research target, through contrast tests of 4 different kind of ore dressing technology process, got it's feasible of process of lead dressing first then zinc sulfide zinc oxide mixed dressing, lead concentrate of grade 51.16% and recovery rate 64.84% and zinc concentrate of grade 50.03% and recovery rate 90.23% were obtained in closed-circuit test, products were all meet the quality demanding of YB114-81 fifth class.

Construction of Recycling Economy Operation Model of  Uranium Mine based on Material Flow Analysis

XU Bu-Chao, HUA Ming, ZHONG Qi-Jia

2012, 28(06):  21-24. 

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Material flow analysis method is a kind of beneficial attempt of the uranium resources circulation economy operation model. It analysis subsystems of uranium mine like mining, beneficiation and smelt and so on one by one, and input and output matter amount of each system were measured. Finally, material flow situation of the whole system of uranium mine was obtained. It provides an important basis for the measure the level of recycling economy operation, and then it takes a certain corrective measures to improve the utilization rate of uranium resources.

Numerical Simulation on Disaster Control Technology of Large Mined-out Area

XIANG You-Bing, SHAO Hai

2012, 28(06):  25-27. 

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Due to previous unlicensed mining in many metal mines, many different sized mined-out areas are left underground. And volume of some large mined-out area could reach to 10000 m3 and 10000 m2 square meters are exposed. It is the main reason of causing large-scale rock burst and collapse hazard. To order to guarantee the safe stoping of underneath and the adjacent level, waste rock filling carried out on the reasonable level, then the stress layer formed was proposed. Taken a gold mine as an example, stress and shear strain increment situation of surrounding rock before and after large mined-out area filling were researched by numerical simulation method. Numerical results indicate that surrounding rock stress concentration of large mined-out area decreased obviously. Tensile stress area decreased accordingly and the value was little. Value of shear strain increment decreased and the area of shear strain increment were unconnected after filling treatment, and the potential safety hazard was eliminated.

Numerical Simulation on Safe Roof Thickness for Mined-out Area of Iron Mine

LI Chao-Liang

2012, 28(06):  28-31+43. 

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Research status of current roof safe thickness of mined-out area were analyzed. Taken Qidashan iron mine as an example, roof stability of underground hidden mined-out area under loading was analyzed by using FLAC^3D and RFPA, and the relationship between safe roof thickness and span length under loading was simulated. Numerical results show that safe roof thickness and span length of underground mined-out area of Qidashan iron mine was close to linear relationship. In the practical project, the safety factor of 1.3 times of calculated minimum roof thickness should be considered. It provides theoretical guidance for roof and pillar safety of Qidashan iron mine.