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Table of Content

    15 January 2014, Volume 30 Issue 01
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    Overseas Mining Investment Risk And Control
    SUN You-Ping, WU He-Ping
    2014, 30(01):  1-3+12. 
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    Discuss the various risks of overseas investment in mining investment projects， analyze the risks that may exist in the domestic enterprises in overseas mining investment， and point out the problems and deficiencies faced by the overseas mining investment， to avoid and control investment risk strategy and advice.
    Research on the Feasibility Evaluation of the Overseas Mining Investment ——Taking the the Bolivia Manganese Ore Project of Jiangsu Geology & MineralExploration Bureau as a Case
    CHEN Yun, YAO Wei-Jun, CHEN Wen-Ting
    2014, 30(01):  4-8. 
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    The related sepcific factors of the overseas mining investment projects are analyzed comprehensively.Combining with the actual investement situation of Jiangsu geology & mineral exploration bureau,the most important 10 outside elements and 10 inside elements which infulence the feasibility of overseas mining investment project are obtained.Then,the composite scores of the feasibility of the overseas mining investment project can be acquired by using the fuzzy analytical hierarchy process.The composite scores provide some reference for the overseas mining investment.
    Analysis and Application on the Coal Mine System Dynamics Model Based on Non-linear Regression
    CHEN Jing, YANG Yong-Jie, CAO Qing-Gui
    2014, 30(01):  9-12. 
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    Firstly,the main characteristics of the coal mine sysyem is analyzed in detail.Then,the coal mine safety system dynamics model is constructed from the perspective of measure the enterprise's safety management level.Finally,the data of the coal mine syestem dynamic model is quantitative analyzed by adopting the non-linear regression method and the curve model is obtained that can reflect the dynamic change of the various elements of the mine safety system.So,the research results provide scientific basis for actual coal mine system safety management and have an important guiding significance.
    Similarity Principle of the Orebody and the Standard Mining Method Designing
    JIANG Ren-Yi
    2014, 30(01):  17-21+36. 
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    Firstly,similarity principle of the orebody and criterion of the similar orebody are introduced in detail.Then,the main points of the standard mining method designing are summarized. Finally,the method and procedure of the standard mining method designing by the application of similarity principle are illustrated through an example of the design.It is concluded that the research results in this paper can provided reference for the metal mine high stage design and construction design.
    Research on the Reasonable Thickness of Cover Rock of Caving Method in Dahongshan Iron Mine
    YU Zheng-Fang
    2014, 30(01):  22-24+30. 
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    Obtaining the thickness value of the cover rock is the key factor of the caving method.In view of the actual situation of the mining in Dahongshan iron mine,The thickness value of cover rock of caving method in Dahongshan iron mine is acquired by adopting the theoretical caculation and numerical simulation method from the perspective of the mining technology of underground mining and mining safety respectively.
    Research on the Loss and Depletion of Sublevel Caving without Sill Pillar
    DI Hui-Chao, YAN Man-Zhi
    2014, 30(01):  25-26. 
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    In view of the loss and depletion of sublevel caving without sill pillar,the development process of the ore drawing stochastic medium theory ,ore drawing continuous medium theory and optimization of blasting are discussed respectively,which include bulk movement probability density equation,eccentricity equation,the utility model of blasting optimization and so on.Then quantification relationship of drawn out body and loss body of the ore drawing and the collapse body of the caving ore are analyzed in detail,and the quantitative circle model of them is established so as to control and predict the ore exploration and reduce the ore loss and depletion.
    Numerical Simulation of the Influence of Horizontal Stress on the Stability of the Roadway
    WANG Xiao-Lei, WANG Yao-Pu, MA Long
    2014, 30(01):  27-30. 
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    The horizontal tectonic stress is one of the important factors that influences the displacement,variation of stresses,and stability of surrounding rock of roadway.In order to deal with the influences of the horizontal tectonic stress on the surrounding rock stress and strain of mine roadway,Numerical simulation research on the dynamic changes of the different side stresses under the roadway support is implemented by combining with the ANSYS and FLAC3D software.According to the numerical simulation results,the curve of different coefficients of horizontal pressure( the value of λ can be 1.0, 1.2, 1.6, 2.0) and roadway deformation is obtained and the displacement of surrounding roadway,change of stress,and the distribution rule of roadway surrounding plastic range are analyzed in detail.On the whole,the numerical simulation and analysis results in this paper can provide reliable reference for exploiting and maintaining of the roadway.
    Experimental Research on Beneficiation of a Low Grade Copper Ore from Anhui
    YI Lin-Fei, DAI Xian-Ren
    2014, 30(01):  31-33+40. 
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    The beneficiation test of copper ore from Anhui was conducted. Test results show that by adopting the new high efficiency mixed collector，through the closed-circuit test of once roughing,twice cleaning and triple scavenging，the copper concentrate grading 22.01% Cu is obtained, at the recovery of 91.35% Cu，with the recovery of Au 77.77% and Ag 70.72% in the copper concentrate. The beneficiability of the ore was higher，so it could be applicable for exploiting the deposit.
    Recovery of Gold in the Pyrite Cinder by Pretreatment and Cyaniding Craft
    LIU Jun, LI Zheng-Yao, LI Heng-Qian, MA Bin
    2014, 30(01):  34-36. 
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    Recycling gold tests on some pyrite cinder were conducted, according to the result of process mineralogy of the pyrite cinder. The results indicated that the influence of Fe and Cu on cyanide leaching was eliminated by pretreatment. As a result, the leaching rate of gold increased from 52.15% to 78.92% by the process of the pretreatment and cyaniding craft. The technology provides a effective technical way for recovery of gold in the pyrite cinder.
    Study on Separation of Refractory Multi-metal Ore Sulfur Arsenic
    LIAO De-Hua, CHEN Xiang, XIE Guang-Cai
    2014, 30(01):  37-40. 
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    A Refractory metal zinc tin ore, lead and zinc recovery after the election of sulfur, sulfur concentrate arsenic exceeded; Carried out after the first magnetic float and float after the first magnetic flow comparison test to determine, After magnetic processing, and one roughing two cleaning two scavenging flotation sulfur, then combined two parts of sulfur concentrate together, got the sulfur concentrate with grade of Sulfur 40.65%, recovery of Sulfur 90.28%, and grade of arsenic 0.37%.
    Comprehensive Utilization of Primacy Sulfur Cobalt Concentrate in West Panzhihua Vanadium-titanium Magnetite
    DENG Jie, ZHANG Yuan, LIU Fei-Yan
    2014, 30(01):  41-44. 
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    In west panzhihua vanadium-titanium magnetite, the grade of sulfur and cobalt were low in the S-Co rough concentrate, which cannot meet the demand of comprehensive utilization. Thorough research was conducted on the process mineralogy and beneficiation experiment to improve the utilization of sulfur and cobalt in west panzhihua region. The main sulfide mineral in vanadium-titanium magnetite are pyrite and pyrrhotite, cobalt is enriched in pyrite and hengleinite. By using sulfuric acid, butyl xanthate, copper sulfateand lime in combination, through the "cleaning-separation" process, the Co-S concentrate containing 0.74% Co, 41.07% S and sulfur concentrate containing 35.58% S can both be obtained, the comprehensive recovery of Co and S reaches 84.45% and 91.45%.
    Research on Reconcentration of Flotation Tailings from a Ore Dressing Plant Using Flotation Column
    QI Shuang-Fei, WANG Kui-Jun, MA Zi-Long, HAO Liang-Kai, TIAN Kun-Lun
    2014, 30(01):  45-50. 
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    In order to reduce the grade of floating tailing from a ore dressing plant, experimental researches were conducted to recycle the hematite from flotation tailings with the TFe grade above 16%. Above all, a mss of grinding and magnetic separation condition experiments were carried out to determine the optimal process parameters, on the basis of which, we presented one roughing—two cleaning—two scavenging open circuit flotation test followed by one roughing—one cleaning—one scavenging open circuit flotation column test. Results proved product indicators of flotation column were better than that of flotation machine. One roughing—one cleaning—one scavenging closed circuit flotation column test was conducted and a favourable product index was obtained with the concentrate grade of 65.29%, floating tailing grade of 11.48%, concentrate rate of 56.18% and concentrate recovery of 87.94%.
    Reformation and Practice on Comprehensive Recovery of Metal Minerals in the Skarn Type Magnetite
    ZHAN Xun-You
    2014, 30(01):  51-56. 
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    In view of the problems of low metal recovery and low concentrate grade in the original production process, based on the experimental study and combined with the actual production, the mineral processing is transformed and the equipment is updated, which greatly improves the metal comprehensive recovery index and creates considerable economic benefits for the enterprise. At the same time it provides valuable practical experience for ore-dressing of the skarn type iron ore.
    Intelligent Optimization on the Ventilation System in a Mine
    HAO Quan-Ming, LI Lian-Ming
    2014, 30(01):  82-84. 
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    Mine mine ventilation system is an important part of the production system and it is basic condition to guarantee the mine safety production.The optimization intelligent ventilation system is constructed,so as to clear the ventilation paremeters automatically and realize the on-line monitor the wind speed,air volume,air pressure,the gas,dust and harmful gas and conduct the mine's reversing wind exercise at the base of constructing the three-dimensional mine ventilation model.The research results indicate that,the optimization intelligent ventilation is good for improving the mine safety production,preventing and controlling the mine gas ,coal dust and fire.
    Instability Analysis of Open Pit Mine Slope based on Fault Tree Theory
    HE Jun-Cai, ZHU Heng-Zhong
    2014, 30(01):  85-88+96. 
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    In order to obtain the scientific,resonable,quantitative and qualitative evaluation results of the accident risk of the open pit mine slope,according to the accident tree structure theroy, fault tree model of the open pit mine slope is established at the base of analyzing and summarizing instability factors of the open pit mine slope.The key factors that affect the open pit mine slope instability include that weak plane exists,the complicated regional geological structure,groundwater effection,illegal mining,management and institution construction are obtained by the calcuation of minimal cut sets, minimal path sets and the importance of structure.In line with the research results,some corresponding prevention measures are put forward.It have great important guiding significance for preventing and controlling of the open pit slope instability.
    Research on the Rule and Numerical Simulation of Dust Distribution and in Rock Heading Face
    GUO Jun, CHEN Sheng
    2014, 30(01):  89-93. 
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    Combining with the spot testing and numerical simulation method andaccording to the actual situation and the measured datas of the excavation roadway in Xuecun mine,the rules of dust distribution and dust diffusion are simulated by the Fluent software of fluid dynamics under the condition of the mural chimney in ventilation and the dust remover are installed or not.The research results show that,installing the dust remover can not only reduce the dust concentration in the roadway but also change the space distribution of the residual dust and improve the environment quality in the working area.
    Influence of Rock Bolt Installation on the Baiyun Ore Slope Stability
    JI Zhi-Yong, YAN Yong-Fu, DOU Kun
    2014, 30(01):  94-96. 
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    According to the actual situation of Baiyun ore slope, the influence of the different anchoring angle and anchorage length of rock bolt on the ore slope stability is simulated by using the FLAC3D software.The safety coefficient F of slope under different anchoring conditions based on the theory of strengh reduction.In view of the relationship between the safety coefficient F and anchoring angle and anchorage length,the optimal anchoring angle change rule and the influence of the anchorage length on the ore slope stability are obtained.So,the research result in this paper can provide reference for the rock bolt installation of Baiyun ore.
    Risk Evaluation on the Coal and Gas Outburst by Set Pair Analysis Method
    LIU Nian-Ping, LI Shi-Xiong
    2014, 30(01):  97-100. 
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    In view of the complex mechanism of coal and gas outburst, firstly, the limitations of obtaining the weight of indexes by analytic hierarchy process is improved by adopting the set pair theory.Then, the model of set pair analysis (SPA) about risk evaluation of coal and gas outburst is set up.Finally,the evaluation model with set pair is verified by evaluation index system, which contains gas pressure, gas radiation initial velocity, consistence coefficient of coal,structural complexity and vertical depth. The experimental results show that the caculation of the model of SPA is simple and accurate. SPA model, not only can obtain the detailed rank of evaluating system, which measured quantificational risk of coal and gas outburst in mine, but also can get the probability of each grade,so it is a kind of effective method to evaluate the risk of coal and gas outburst.
    Preparation of Ceramsite Using Tailings Discarded after Direct Reduction-Concentration Process
    SHI Cheng-Shuai, WANG Hua-Jun, MEI Jing, FENG Zhi-Yuan, ZHANG Kai-Lu
    2014, 30(01):  115-120. 
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    Tailings discarded after direct reduction-concentration process was used as principal material ,adding sewage sludge,to sinter lightweight ceramsite. The optimized preparation conditions were selected. The impacts of main factors ( preheating temperature, preheating time, sintering temperature, sintering time，and material ratio) on characteristics of ceramsite (apparent density, bulk density, water absorption and crushing strength) were studied. The results show that the optimized mass ratio of tailings to sewage sludge was that tailings∶sewage sludge=95∶5. The optimized preparation conditions were as follows: preheating temperature 550 ℃, preheating time 30 min, sintering temperature 1 110 ℃, and the sintering time 6 min. Under these conditions, the characteristics of ceramsite were obtained as follows: apparent density1.365 g/cm3, bulk density0.672 g/cm3, 1 h water absorption3.50% , crushing strength 220 N,cylinder compressive strength 3.5 MPa.
    Study on Fuzzy Control Theory for Combustion Process of Rotary Kiln
    XIAO Min-Chu
    2014, 30(01):  121-123+129. 
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    In order to precisely control the temperature of rotary kiln, limonite ore in rotary kiln equipment as the object of study, on base of the analysis on the principle of fuzzy control, combined with study of the fuzzy temperature control (FTC) and research of the coal/air ratio fuzzy adaptive control (FAC), fuzzy control system of rotary kiln is designed，and the best combustion process in rotary kiln is found. The results showed that the fuzzy control saves about 10% energy than manual control of combustion process of rotary kiln, which can control the temperature accurately in the whole process, and has the reasonable, feasible, safety, economical, efficient and environmental friendly advantages.