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Table of Content

    12 October 2011, Volume 27 Issue 10
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    The Development of Mining Equipments Promoted by Modern Advanced Technology
    LI Dong-Ming, XU Ke
    2011, 27(10):  1-3+10. 
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    Current situation of mining equipments of China was introduced, the application of various advanced technologies on mining equipments were discussed, including electromechanical integration, Can-Bus, variable delivery hydraulic system, proportional hydraulic control and remote monitoring and so on. Effects and influences of the advanced technologies on mining equipments performance improving were analyzed, and the development for the future was prospected. Which provided references for the design and development of all kinds of new type mining equipments.
    The discussions of some problems about the current remising price of mining right
    GONG Xing-Xiang
    2011, 27(10):  4-6+14. 
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    The remising of mining right is a way of selling out mining rights  on behalf of a country. And it is an important aspect of the mining right's market construction. Presently there were some problems in its operation such as how to decide the payment amount of the mining right cost, and what is the decision procedure for the mining right's price? Which have an immediate effect on the the essence of mining right cost and the fairness of mining right market. This article attempts to be helpful to the operation of the mining right market construction.
    Study on Mining Rights Value Evaluation Method based on Black-Scholes Model
    TIAN Yu
    2011, 27(10):  7-10. 
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    Characteristics of traditional net present value method of mining rights evaluation were carefully analyzed, started from marketable value study of mineral resources mining rights. Practical mining activities characteristics of mineral resources were discussed combined with concrete cases. The improved Black-Scholes model was used in mining rights value evaluation. The reasonable term of mining rights value calculation was proposed which was equal to the sum of mining rights service time and basic construction period before mine commissioning. Using this model in mining rights evaluation of a mine, the following results were obtained: mining rights value present trend of increased at first and then decreased with the increasing of mining rights option term, mining rights value increased with the longer term of mining rights of same clan mining claim at a certain time range. Mining rights evaluation results were obtained through this evaluation model which could be much close to marketable value of mineral resources, accordance with mining rights value development trend in the process of development and utilization of mineral resources, would be helpful to practical investment analysis and management decision, and to confirm reasonably  mining rights granting term for government functional department.
    Soft Broken Roof Deformation Rule Analysis
    BAI Yan-Jie, ZOU De-Jun, GUO Ping, XU Jian, 毅
    2011, 27(10):  11-14. 
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    Soft roof and floor of coal seam could be easily damaged while support was not timely and strength was not enough, so overall support was needed for laneway with strong support strength. Took drift of S1136 section of a mine in Sichuan province as the research object, through site observation results and data fitting, the relationship curve distribution presented "S" shape was obtained between roof squat and time, and common relationship expression was established according to different changing speed. The common curve of roof squat and time relationship was divided into four stages: primary development stage, constant velocity stage, development velocity attenuation stage and steady stage. The result of curve shape were obtained related to roof rock formation property, support mode, laneway buried depth, driving effect degree and other factors. In addition, curve would lack of primary development stage influenced by different roof strata property and different driving effect degree.
    Experimental Study on Roasting of Stone Coal Vanadium Ore
    HE Dong-Sheng, XU Xiong-Yi, QIN Fang, ZHANG Han-Quan, ZHANG Yi
    2011, 27(10):  15-17. 
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    Effects of roasting temperature, roasting time, kinds and addition amount of  addition and other factors to vanadium leaching rate were investigated. Results indicate that roasting temperature and time have greater influence to vanadium leaching rate, best roasting condition is 800 ℃,3 h; adding NaCl or Na2CO3 both could increasing vanadium leaching rate significantly, vanadium leaching rate could increase 23.21 percentage reach to 84.45% by adding 2% Na2CO3+1% oxidant H-1.
    Experimental Study of Magnetite Mine Tailings Reconcentration
    LIU Ya-Hui
    2011, 27(10):  18-20. 
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    On the basis of brief analysis on recovering weakly magnetic minerals from a mine tailings of Shandong Hualian Mining, separability study was done mainly. The results indicate that qualified iron concentrate was hard to obtained from this sample by adopting single-weak magnetic separation process, iron concentrate with iron grade 65.43% and recovery rate 66.66% could obtained by adopting grinding-low intensity magnetic separation-grinding-reverse flotation technology.
    Production Practice of Improving Gold Direct Recovery
    ZHOU Zhi
    2011, 27(10):  20-21. 
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    Perfection of chloriding and extracting gold technological process was described briefly, optimization of technological parameters which effect gold direct recovery rate was analyzed. Practice proved, through improvement of technological process and parameters, productive technical target was stable and optimized, gold direct recovery increased from 92.60% in 2007 to 94.83% in 2009.
    Measures to Improve Concentrate Quality of Ultralean Magnetite
    FEI Wen-Kun
    2011, 27(10):  22-23. 
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    Problems exposed during ultralean magnetite treatment by primary technological process of Ma Steel Washan concentration plant were described briefly, then modification scheme research and demonstration were done through laboratory test, modification scheme and effect after modification were introduced mainly. Practice improved, technological process after modification had significant quality improvement and impurity reduction function and high stability, could steady the iron concentrate grade of Washan concentration plant above 64%.
    Analysis and Control Study on Deep Heat Harm of Mine
    HUANG Shou-Yuan, HOU Yu-Qiang, WU Leng-Jun
    2011, 27(10):  24-27+53. 
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    High temperature and humidity damages were the common problems faced during mine stretch to the deep, which would bring huge harm and effect to the healthy of underground workers and mine safety production. Two major thoughts were discussed of non-artificial refrigeration and cooling and artificial refrigeration and cooling (mine air conditioning cooling) for heat harm control. Main types and basic principle of mine air conditioning cooling were introduced, main technical measures and characteristics were analyzed of non-artificial refrigeration and cooling and the advantages and disadvantages of mine air conditioning cooling scheme.