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Table of Content

    15 November 2007, Volume 37 Issue 11
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    Applied Progress of Molecular Biological Technology in Research of Bio-leaching Microorganisms
    LIU Wen-Yan, WEN Jian-Kang, CHEN Bo-Wei, RUAN Ren-Man, WU Ming-Lin
    2007, 37(11):  1-5. 
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    With its rapid development, molecular biological technology has been more and more applied in the research of bio-leaching microorganisms. DNA G+C mol% determination and DNA/DNA hybridization are common molecular biological methods in the taxonomic identification. PCR technology and the analysis 16S rRNA gene sequence based on this are also widely used in the taxonomic identification,Meanwhile,RFLP and RAPD techniques have also played an important role in the taxonomic identification of bioleaching microorganisms.In addition,molecular biological technology has been used to reveal the microbial community composition and succession of bioleaching system, with the technologies such as DGGE, SSCP, ESP, FISH, gene bank and pulsed field get electrophoresis playing a great role.
    Status Quo of Utilization Way Research of  Refractory Iron Ore in China
    ZHANG Jin-Rui, HU Li-Ke, LIANG Yin-Ying
    2007, 37(11):  6-9. 
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    The paper reviews the research on refractory red iron ores, with the highlight on the status quo of the research on oolitic hematite that is considered as refractory both in and outside China and that of Anshan type hematite, whose research has achieved rather rapid progress. A new utilization way is proposed for oolitic hematite beneficiation research, that is,direct smelting and then using the slag to make glass ceramic.
    Study on Mining Expert System Based on Virtual Mining Model
    HUANG Yan-Li, QIN De-Xian, CHEN Ai-Bing, SUN Cai-Xia
    2007, 37(11):  10-13. 
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    In view that conventional mining expert system lacks dynamic forecasting function and safety monitoring function, an integrated frame of mining expert system based on virtual mining model is proposed. The study on the virtual dynamic mining model is described in detail, and the structure of the expert system and the functions of its components are highlighted. Based on this, the development principle of the expert system is expounded. The effective cooperation and fusion of the dynamic forecast of the model with the expert experience knowledge can realize an organic integration of qualitative and quantitative policy decision reasoning, thus reducing the decision-making risk of the system.
    Research and Application of Integral Technology of Continuous Mining-Induced Roof
    ZHANG Shi-Chao, ZHOU Ke-Ping, GU De-Sheng, JIANG Jun-Sheng
    2007, 37(11):  14-17+47. 
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    For large lean ore deposits, it is economically unfeasible to use the filling method and there are problems of low integral resource recovery and difficult control of ground pressure in later period if conventional open-stope or caving method is used. As a solution, Professor Gu Desheng has proposed a continuous mining method , where the ore block is taken as a stoping unit , there are no intermediate pillars between the ore blocks and induced roof caving is used to release the ground pressure. The industrial test made on No. 92 orebody Dachang Underground Copper Mine has effectively raised the resource recovery and successfully prevented the great ground pressure disaster by economic and safe engineering means.
    Test of Grouting Reinforcement of Deep Roadway and Control of Its Stability
    NIU Xue-Liang, FU Zhi-Liang
    2007, 37(11):  18-21. 
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    Based on the analysis of stratum structure of wall rock of Gucheng Colliery, rock mechanical parameter test and wall-rock stability classification were made. It was concluded that the main north roadway at 850m level in the colliery is of typical “instable wall rock roadway (Class IV)”. In view of this, compound support mode was proposed and the support capability of inverted arch analyzed. The results indicate that the compound support mode can make the surrounding supporting body to form an enclosed structure, thus facilitating the improvement of the roadway support effect.
    Numerical Simulation Analysis of Effect of Bedded Structural Plane on Tunnel Stability
    LI Wen-Zeng, MA Qun, WANG Ji-Bao
    2007, 37(11):  22-25. 
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    From the viewpoint that rock is a heterogenic material, by introducing microscopic elements in microscopic level, using unit constitutive model based on damage mechanics and statistics theory and adopting RFPA2D, an analysis software for rock fracture process, analysis is made of the deformation failure mode and characters of the tunnel excavated in rock mass cut by bedded weak structural planes at different dip angles, the displacement and stress change at the key points on tunnel surface as well as the safety margin of the tunnel. It will be of great theoretical and practical significance to the further understanding of the failure and instability mechanism of the tunnel in weak structural planes and to the adoption of effective strengthening measures.
    Calculation and Practice of Sublevel Extractable Reserve of Underground Zone in Daye Iron Mine
    CAO Ting-Xiao
    2007, 37(11):  26-28. 
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    Pillarless sublevel caving has gained wide application in metal mines, where horizontal cross-section method is generally used to calculate the stratified reserve that is used in the reserve management of the production sublevels. The concept of sublevel reserve is proposed based on many years' practice. With Longdong orebody in Daye Iron Mine as the real case, the calculation method of sublevel reserve is described in detail and the calculation error is compared and analyzed. The adoption of the sublevel reserve calculation method can reduce the calculation amount, shorten the calculation cycle and improve the reliability of reserve, thus greatly facilitating the guidance on mining production, the mine loss and dilution calculation and the dynamic management of reserve. It can be reference to the similar mines.
    Application of Fuzzy Mathematics in Optimal Choice of Mining Method
    SHI Tai-Lu, REN Feng-Yu, LI Wen-Zeng, ZHOU Zong-Hong, YE Zhen-Hua
    2007, 37(11):  29-31. 
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    Whether the mining method is rational or not will have great impact on the economic benefit of mining enterprise. To improve the engineering analogue method in the selection of mining method, the paper describes the principle, procedure, characterization of membership function and determination of weight coefficient of using fuzzy mathematics in the selection of the optimal mining method for Moping Gold Mine. The forecasted indexes have been verified in the production practice, indicating that fuzzy mathematic method is feasible here.
    Test Analysis of Slope Mass Dynamic Response under Moving Load
    CHEN Jia-Sheng, JIANG Li-Chun
    2007, 37(11):  32-34. 
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    Moving load is an important factor affecting the open-pit slope. The moving load dynamic test on Xinqiao Mine slope indicates that low frequency vibration takes a larger proportion in the whole frequency domain and the vibration low frequency mainly varies between 10 to 60Hz. The propagation velocity of train loading is below 0.01m/s on average and the propagation distance of the stress wave from moving load is generally between 5 to 20m. The high frequency component of vibration spectrum is absorbed instantly by rails, leaving small effect on both subgrade and slope; and the medium frequency component is transmitted from rails to subgrade, producing unstable excitation vibration to far-field subgrade and slope which will influence the structural stability of both subgrade and slope. In actual engineering, local reinforcement can prevent the sand soil from liquefaction in disturbed area.
    Effect of Xiaowangzhuang Underground Iron Mining on Stability of Daqin Railway Subgrade
    WANG Zhi-Guo, GUO Jun, GAN De-Qing
    2007, 37(11):  35-37+47. 
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    The paper analyses the factors of Xiaowangzhuang underground iron mining that influence the stability of Daqin Railway subgrade and establishes a FLAC numerical simulation model suitable for mining project simulation. Through the numerical simulation analysis, the values of the stress change around the railway are calculated. The simulation results indicate that the displacement around Daqing railway induced by Xiaowangzhuang underground iron mining is at the order of magnitude of 10-4, almost no impact at all., which is of great reference significance to the mine construction and normal production.
    Research on HP Compound Tailing Cementing Agent
    CUI Xue-Qi, GE Hui-Chao, 吕Xian-Jun
    2007, 37(11):  38-41. 
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    This paper investigates a HP compound tailing cementing agent composed of high water material (HWM) and portable cement (PC). Cementation test was made on the tailings at different concentrations, types and particle sizes, and measurement was made on the uniaxial compressive strength of 3d, 7d, 28d and 56d of the cemented blocks with a cement-sand ratio of 12%. The optimal proportioning ratio and application method of this new type compound cementing agent are determined through the comprehensive analysis of the cemented block strength and the cost of the cementing material. The test results show that the tailing pulp concentration has no impact on the proportioning ratio of the cementing agent and the effect of the aggregate type on the agent is in fact that of the aggregate particle size.
    Wavelet Packet Decomposition of Blasting Vibration Signals and Energy Distribution Characteristics of Frequency Bands
    ZHANG Yao-Ping, CAO Ping, GAO Sai-Hong
    2007, 37(11):  42-47. 
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    In light of the characteristics of blasting vibration signals of non-stability, short duration, and time and frequency field localization, and through the brief description of the analysis technology of blasting vibration signals, the paper concludes the features of the wavelet analysis technology. Meanwhile, based on the determination of wavelet decomposition layers and the optimal selection of wavelet packet base, energy calculation formula is used in programming in MATLAB 7.0 language environment, and the preliminary law of the energy distribution of blasting vibration signals is drawn, laying a theoretical basis for the further study on blasting vibration signals.
    Analysis and Integral Regulation of Highway Slope Slip on Side of  Yichuan Tantalum-Niobium Mine
    HU Zhi-Yi, HE Jian
    2007, 37(11):  48-50+91. 
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    Slope slip has occurred at the highway outside the concentrate bin of Yichun Tantalum-Niobium Mine, where the hidden danger of slope slip still exists. Therefore, analysis is made of the formation mechanism of the internal factors, external factors and inducement of the slope slip and its characteristics, and also of the slope stability. Based on this, scheme comparison is made. The comprehensive control measures such as support and block, surface regulation of the slope mass, slope protection and drainage can ensure the safety operation of the concentrate bin of the concentrator.
    General Thoughts on the Construction and Development of Sijiaying Iron Mine
    ZHANG Yong-Kun
    2007, 37(11):  51-53. 
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    Applying the scientific development views, and establishing the developing concept of Green Mining. While the mineral resources are rationally exploited, the waste also needs to be recycled. The general thoughts on the construction and development of Sijiaying Iron Mine should be based on the ideal of saving land and environmental protection. And this thoughts must be applied in whole mine design plan and the scheme selection process.
    Experimental Research on Separation of Low Grade Bauxite in Cyclonic Centrifugal Field
    GAO Shu-Ling, LI Xiao-An, WEI De-Zhou, JIA Chun-Yun, WANG Peng, HAN Cong, LIU Jiong-Tian
    2007, 37(11):  54-57. 
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    Theoretically based on the difference in the hardness and density of diaspore and silicate mineral in bauxite, the analysis is made of where the difficulty lies in their classification and separation by conventional gravity method. It is suggested to introduce a cyclonic centrifugal field to intensify the difference in density, and the test is made on bauxite ore with A/S of 4.39 and a grind of 61.90% -0.074mm. The test results show that by increasing the feeding pressure of the hydrocyclone,the separation based on the density difference can be effectively strengthened. Increasing the apex diameter of the hydrocyclone can obtain underflow and overflow with A/S being 6.5～7.0 and 2.08 respectively. This can be an effective technical reference for the pre-desliming of low grade bauxite.
    Research on Bioleaching of Sphalerite
    ZHOU Ji-Kui, NIU Yin-Jian
    2007, 37(11):  58-60. 
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    To study the leaching effect of bacterial on sphalarite, a strain of leaching bacteria　that has high activity on Fe2+ and element sulfur is isolated and used in leaching. At the conditions of a pulp density of 15%, table vibration frequency of 200r/min, temperature of 30℃, inoculation amount of 10% and pH value of 2.0, the zinc leaching rate can be nearly 100 % for 33 d leaching and for sphalarite concentrate at the same conditions, 37.9% for 33d. It indicates that bacteria can promote the leaching of metal zinc in sphalarite ore.
    Research on Reverse Flotation of Motuoshala Iron Ore
    GUI Fang, LIU Rui-Quan
    2007, 37(11):  61-64+78. 
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    Feasibility study is made on the beneficiability of Motuoshala ore which mainly contains hematite both by anionic and cationic reverse flotation based on its lithofacies analysis, multi-elements chemical analysis, mineralogical phase analysis, size analysis and magnetism analysis. The effect of the type and dosage of collectors and depressors on the reverse flotation result is studied. The test results show that when anionic reversed flotation process is used to treat Motuoshala ore at 25℃, an iron concentrate with a grade of 60.15% , iron recovery of 93.23% and SiO2 content of 9.32% can be obtained.
    Research on Factors Influencing Bioleaching of Chalcopyrite at Low Temperature
    ZHANG De-Cheng, LUO Xue-Gang
    2007, 37(11):  65-68. 
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    Experimental research is made on the effect of size, pulp concentration, acidity, inoculation amount and initial Fe2+ concentration on chalcopyrite leaching with T.f in shaking flask at a low temperature of 15℃ by orthogonal method. The test result indicates that the initial Fe2+ concentration has the most evident effect on the bioleaching process of copper and the optimal conditions at a temperature of 15℃ are: initial Fe2+ concentration of 6g/L, pH value of 2.0, inoculation amount of 15%, pulp concentration of 15% and particle size of 200 mesh.
    Research on Multiple Reagent Regime for Improving Recovery and Its Application
    DUAN Feng-Mei
    2007, 37(11):  69-70+73. 
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    To improve the beneficiation recovery of Wangershan gold ore, in light of the properties of the mill-feed ore, a large number of small laboratory tests and an industrial test on multiple reagent regime were carried out. The research and production application show that when a reagent multiple regime is used to replace the conventional single reagent regime for gold separation, the recovery of oxide ore can be improved by 4.45 percentage points and that of sulfide ore by 0.70 percentage point at a basically similar concentrate grade. As a result, the beneficiation cost is effectively reduced, indicating good economic benefit.
    Experimental Research on Separation of Copper from Sulfur of Longqiao Low Grade Ore
    LU Qing-Feng
    2007, 37(11):  71-73. 
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    In light of the features of bulk copper-sulfur concentrate of Longqiao Iron Mine, the bulk concentrated was reground to 88.00% -45 μm  and then treated by one roughing, one cleaning and one scavenging flowsheet. As a result, the grade and recovery of the copper concentrate and the sulfur concentrate reached 20.84% and 90.54 %, and 49.48% and 94.85% respectively, rather good metallurgical performance. Thus, the difficulty in separating the copper from sulfur in bulk concentrate was effectively solved.
    Research on Oxygen Utilization Rate in Manganese Tetroxide Preparation
    YU Jin, ZHANG Yu-Can, LI Ru-Hong
    2007, 37(11):  74-75+110. 
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    The oxygen utilization rate is low in manganese tetroxide preparation by metallic manganese powder suspending liquid process. It is demonstrated by the test that the addition of catalyst or hydrocarbon compound can improve the oxygen utilization rate and if the two are added in a well matched ratio, the oxygen utilization rate will be greatly raised without over-oxidation.
    Three Methods for Measuring Na2O and K2O in Iron Ore and Their Comparison
    FU Ran-Ran, LIAO Hai-Ping, HE Cun-Jun, LIU Shui-Qing
    2007, 37(11):  76-78. 
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    Iron ores were dissolved with HCL+HF and their Na2O and K2O contents were measured by methods of flame absorption (adding CsCL), flame absorption (not adding CsCL) and flame emission (not adding CsCL). Comparison is made between them and shows that the measurement results obtained by the three methods are all acceptable, which are preliminarily analyzed.
    Storage of GML Spatial Data Based on Oracle
    LAN Xiao-Ji, DENG Hua-Mei, LI Xiao-Feng
    2007, 37(11):  79-82. 
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    With the continuous perfection of GML standards and the wide support of GIS software suppliers, GML has in fact become an international standard for spatial data coding, transmission, storage and distribution, and more and more spatial data have been stored in GML format. How to effectively store and manage GML spatial data has been the focus of GIS research. It is the first time to attempt to use Oracle database to store and manage GML data. Comparative analysis is made among the three storage means provided by Oracle XML DB for GML data storage. The study on the storage of GML data in Oracle database will facilitate the data share among GIS softwares and the development of Web GIS.
    Relationship between In-Situ Rock Stress Field and Weak Intercalation in Jinchuan Mine
    MA Chong-Wu, MU Qing-Song, MIAO Tian-De, WANG Li-Juan
    2007, 37(11):  83-86+105. 
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    The continual uplift of the Qinghai-Tibet Plateau results in the strong uplift of the fault block of Lonshou Mountain between a pair of regional conjugated faults.In the fault block, there are two fault systems in longitudinal and horizontal distribution, under the effect of which, two groups of superior joint planes are developed in the rockmass.For a zone with strong fault activity, its faults and the joint planes of the rockmass, to the ground stress field, should approach the critical sliding state.The calculation of the friction force between the joint planes, which is made according to the practically measured stress data and the friction coefficient between the joint planes of the rockmass, does equal the maximum static friction force.Thus the mechanical calculation result conforms to the geoscienctific viewpoint and it can be seen that the weak intercalations in Jinchuan Mine have decisive effect on the accumulation degree and distribution state of the ground stress.
    Research and Application of Gold Mineralization Enrichment Law at X Section of Beiyu Gold Deposit in Yunnan
    JIANG Hua, QIN De-Xian, YAO Zhi-Hua, CHEN Ai-Bing, SUN Cai-Xia, HU Guang-Long
    2007, 37(11):  87-91. 
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    The establishment of three dimensional model of deposit is of great significance to the engineering design and policy decision, which can quantitatively reflect the mineralization strength and mineralization enrichment law of orebodies by mathematics and graphs. It can thus provide scientific guidance for mine production and meanwhile, the basis for ore prospecting at the deposit depth and edges. The paper investigates the average gold grade and metal amount change of the orebodies along the strike, dip and thickness of X section of Beiyu gold deposit in Yunnan and discusses the application of 3D model of deposit in the production and mineralization forecast.
    Study on Characteristics of Structural Mineralization Control of Fengxiao
    CHANG Jun-Lin
    2007, 37(11):  92-94. 
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    The general characteristics, mechanical properties, formation and evolution of the mineralization controlling structure of Baguamiao gold deposit and its mineralization controlling characteristics are comprehensively studied. The results indicate that the occurrence of Baguamiao gold deposit is dually controlled by its brittle-ductile shear zone, imbricate up thrust fault and its induced structure. The small folds in the zone control the shape and extension of gold orebody and the late supposition of NE transtensional faults and joints has re-enriched the gold to finally form commercial rich orebodies in Baguamiao gold deposit.
    Development and Practice of YS Disk Vacuum Filter
    ZHAO Liang, JIE Yu-Shen, JIA Ming-Qing
    2007, 37(11):  95-97. 
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    The paper presents the technical performance of YS disk vacuum filter and analyses its technical characteristics.The analysis of the comparative industrial tests between YS disk vacuum filter and the ceramic filter in AnSteel Donganshan Sintering Plant indicates that YS disk vacuum filter has good filtering performance and effect.
    On Medium Consumption of Secondary and Tertiary Grinding of Gushan and Anshan Iron Ores
    LI Wei-Bing, LI Tai-Rui, XU Chang-Wei, CHEN Wei
    2007, 37(11):  98-101. 
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    New method is proposed for the grinding medium consumption research for different requirements on ore properties and grind fineness and the technical equipment. Based on the study on the grind work index and grindability of Dagushan and Donganshan iron ores, the theoretical and practical medium consumption coefficients of the secondary and tertiary grinding in both Dagushan Concentrator and Donganshan Sintering Plant are calculated, analyzed and compared. Based on this, what should be strengthened in reducing the grinding medium of both plants is proposed.
    Research on Status Quo of Safety Assessment on Underground  Mining in Small and Medium-Sized Metallic Mines
    ZHU Yi-Chun, WANG Nai-Bin, HUANG Hong-Xiang
    2007, 37(11):  102-105. 
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    Safety assessment as an important means for accident forecast and prevention has turned the conventional safety empirical management to an “early process” consisting of pre-identification, forecast and prevention of the system danger. The paper investigates the status quo of the safety assessment of the mining process in metallic mines which belong to highly dangerous industry. Assessment is made to find the potential danger and harmful factors and their dangerous degree, and corresponding rational and feasible safety measures and suggestions are made to provide a scientific basis for the safety production management of mines, thus benefiting the improvement of the mine intrinsic safety and the realization of safety production.
    Study on Culture Conditions of Desulfurizing Bacteria and Desulphurization
    MEI Jian, TAO Xiu-Xiang, LIU Jin-Yan
    2007, 37(11):  106-110. 
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    The paper describes the effect of pH value, culture time and inoculation amount on the growth of Thiobacillus Ferrooxidans. The measurement of the results of coal desulphurization by this bacterium shows that at an initial pH = 2 and an inoculation amount of 15% in 9K culture medium, the concentration of Thiobacillus Ferrooxidans after 5d growth reached 108 /mL, and 10 days later, the pyrite removal rate reached 52.29% and the total sulfur removal rate, 37.75%.
    Analysis of Theoretical Model for Mine-Use Air Curtain of Partition and Jet Type
    ZHAO Qian-Li, GAO Qian, GAO Chuang-Zhou, XUE Xi-Zhong, YU Zhi-Qiang
    2007, 37(11):  111-114. 
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    3D effect chart of the effect pressure mathematical model for air curtain of partition and jet type is plotted using Matlab language and computer. The variation law of the relationship between the air jet amount Q of the air curtain with the fan number n, wind velocity Vc of the air curtain exit, ventilation resistance △H of the roadway with air curtain, wind resistance R of roadway and cross-sectional area Sc of the air curtain exit is analyzed in its 3D coordinate system. Experimental research is also made on the characteristics of the partition airflow and jet airflow of air curtain, providing both reliable theoretical and technical guidance of the actual application of mine-use air curtain.
    Test Research on Pre-concentration for Tailing Discarding from Dachang Cassiterite Tailing
    WANG Ya-Jing, ZHANG Zong-Hua, GAO Li-Kun
    2007, 37(11):  115-117+134. 
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    To effectively recover the valuable elements from the tailings of Dachang cassiterite multi-metal sulfide ore, pre-concentration for Tailing Discarding was tested on the tailing. The result shows that preconcentration for tailing discarding is effective for this tailing. It can discard tailing that has a yield of 44.66%, which can not only improve the feed grade but also reduce the concentration cost. The comparative tests with the processes of direct flotation of lead and antimony from the raw material and the flotation of rougher concentrate to separate lead and antimony show that tailing pre-discarding can achieve ideal metallurgical performance.
    Test Research on Making Light Wall Material with BIF Tailings
    LI Xue-Jin, ZHENG Le-Ping, JIANG You-Yi, CHANG Qian-Fa
    2007, 37(11):  118-122. 
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    Based on the comprehensive analysis of their basic properties, BIF tailings were used to make light wall materials with different binders. The research found that the optimal process parameters include a mass ratio between the iron tailings, inorganic binder and alkaline liquor-modified biomass binder of 90∶5∶5, sintering temperature of 1 200 ±10 ℃and sintering time of 30min. The product made at the optimal conditions has a volume density of 1.314 g/cm3, apparent porosity of 30.98% and compressive strength that satisfies MU7.5 standard.
    Research on Recovering Iron Concentrate from BF Sludge Using Beneficiation Method
    XUAN Shou-Rong, YU Liu-Chun
    2007, 37(11):  123-127. 
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    The paper describes the properties, test and test results of Meishan BF sludge and the methods for treating zinc-containing BF sludge used in and outside China. In light of the properties of Meishan BF sludge, beneficiation method is used in the test on its iron recovery and zinc reduction. The results show that both low intensity and high intensity magnetic separation can recover most of the iron minerals from the sludge, remove most of zinc and realize an effective separation of high zinc from low zinc materials. The obtained iron concentrate has a yield and grade of both over 52%, iron recovery of 70.00% and a zinc removal rate of over 50%, making it possible to still use the BF sludge after zinc removal as iron-making material.