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Table of Content

    15 May 2010, Volume 39 Issue 5
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    Application of Numerical Simulation Methods for Granular Flow in Drawing Engineering
    YANG Xiao-Bing, GAO Qian, WANG Lian-Qing
    2010, 39(5):  1-4. 
    Asbtract ( 1656 )  
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    For the choice of backfilling waste rock in the pit III of Sijiaying iron mine during transferring from surface mining to underground，the PFC2D is used for simulating the ore drawing process，and the results of simulation are regressed and analyzed to obtain the equation between relative particle size and the rate of ore loss and dilution，which provides a theoretical basis to the choice of backfilling waste rock in engineering.This method can minimize the loss and dilution rate during ore-drawing to ensure the economic benefits for mimes.In addition，Matlab is used to establish a single-factor impact to the equation，and get the relationship between various factors and the rate of ore loss and dilution.
    The Modeling and Numerical Simulation of Soil Liquefaction  Mechanism Under the Action of Blasting Dynamic Load
    ZHU Quan-Jie, 欧Yang-Zhi-Hua , WANG Sheng-Kai
    2010, 39(5):  5-8. 
    Asbtract ( 1932 )  
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    With the strong action of mines blasting dynamic load，the rock layer may lead to liquefaction，and great loss like underground mud-rock flow may be created.In view of safety problems of slime running and landslides long-term existing in Chengchao iron ore，and based on the dynamic non-linear coupled solid and liquid constitutive equation，the numerical simulation of mine rocks and sand-soil liquefaction is proposed by applying the OpenSees produced by Berkeley University. What's more，the non-dimensional analysis is used to study the influencing factors of soil liquefaction.Lastly，the relationship curve about mining safety and rock blasting can be got through applying Sadov's formula and the equivalence of blasting vibration velocity and acceleration.
    The Principle of 3D Imaging in Surface Coal Mine based on VRmap
    ZHOU You, CAI Qing-Xiang, ZHOU Wei, CHEN Yan-Long, WANG Bo-Wen
    2010, 39(5):  9-12. 
    Asbtract ( 1643 )  
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    The symbolic，abstract form of traditional analog imaging techniques can not meet requirements of information timelines and accuracy for modern coal mine.This paper presents the process and principle of 3D imaging for surface coal mine based on VRmap.Taking three-dimensional images about coal seam floor，bedrock roof，and land surface in the 6th floor of Heidaigou surface mine as an example，its feasibility and accuracy of imaging were confirmed，thus provide a way to get the mining information in depth for mining decision makers.
    Study on the Laws of Energy Release of Rock Mass in Filling Mining
    DU Shao-Lun, LIU Zhi-Xiang
    2010, 39(5):  13-15+33. 
    Asbtract ( 1942 )  
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    The coupling mechanical action between filling body and rock mass during filling mining is a process of energy dissipation.The destructive ratio of energy in rock is analyzed，and the laws of energy release in rock mass are researched with the finite element method.The researching results show that energy release in rock mass increases with the bulk excavating，which their relationships exhibit in a way of secondary curve.And there are remarkable effects in decreasing the ratio of energy release when stope is filled.
    Check and Proposal for Stope Structural Parameters of Filling Method in Daye Iron Mine
    LI Ke-Shun, WU Shan, SONG Wei-Dong
    2010, 39(5):  16-20+116. 
    Asbtract ( 1637 )  
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    In combination with the mining technology conditions of Daye iron deposit，the stope structural parameters of the subsequent cementation and filling method for the level of -180 m at the eastern mining area were calculated and simulated.Firstly，the stope roof was simplified as the support beam by using the mechanical model，and the maximum span of the roof were calculated to determine the scope of stope structural parameter.Then，the strength of pillar was calculated.Secondly，the numerical simulation is made by FLAC software.The sequence of “one mined，one left” mining method is taken to recover the mining room and pillar step by step.The safety factor was achieved through analyzing the stress distribution and the variation of plastic zone and displacement.Comparing the integrated mining efficiency and the safety factors，recommendation on the stope structural parameters of filling method for Daye Iron Mine was proposed.
    Effect of the Natural Grade Classification of Loose-covered Rock with Caving on Ore Loss and Dilution
    ZHANG Guo-Jian, XU Guo-Quan
    2010, 39(5):  21-24+33. 
    Asbtract ( 1920 )  
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    The natural grade classification of loose-covered rock has a great effect on caving mining efficiency.To fill the research gaps in this field，laboratory model tests were carried out.Test results confirmed that the classification phenomenon of natural grade was one of properties to determine where loose-covered rocks exist.Different distribution of particle size leads to different impact of loss and dilution.The study provides a new method for reducing the loss and dilution of ore.  
    University of Science and Technology Bejing
    MING Jian, HU Nai-Lian
    2010, 39(5):  25-28. 
    Asbtract ( 1452 )  
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    The action of drift pressure with the pillarless sublevel caving method is very sever due to the complicated and changeable engineering environment and the influence of mining，especially in soft and fracture ore body.This paper analyzes the deformation mechanism of drift and rock in detail in non-pillar stope with pillarless sublevel caving methed，according to the underground pressure feature in several civil soft and fracture ore bodies.Then the relevant conclusions of geogical nature，distribution feature and the proposals to control underground presure are made.
    Discussion on Classification of Artificial Deposit
    ZENG Xiao-Hua, LIAN Yong-Lao
    2010, 39(5):  29-33. 
    Asbtract ( 1462 )  
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    The concept and research general situation of the artificial deposits are introduced，and its classification are elaborated.According to the ore-forming materials and ore-forming processes，artificial deposits can be separated into two types，namely mining wastes residue and industry wastes residue.The Deposit characteristic，present situation of development and significance of various types of artificial deposits were discussed as well.
    Numerical Simulation Research of Stress Memory Effect of Different Size Rocks under Point Load
    LIU Ming-Song, XIE Liang-Bo
    2010, 39(5):  34-37. 
    Asbtract ( 1722 )  
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      The point-load-cyclic-loading-simulation tests on five specimens of different H/W ratios are made by using RFPA2D，that is，the rock failure process simulation software.Tests results showed that rock samples in point load tests have size effects，and that stress memory effect is more obvious on the samples of 100  mm× 50 mm (H × W).This is in accord with the results of laboratory tests，and of great significance for the research of rock point load.  
    The Optimization of Rock Mechanical Parameters Based on Random-fuzzy Theory
    HAN Lei, SHU Ji-Sen, QIAN De-Yu, 吕Jin-Xing , SHU Ying-Qiu
    2010, 39(5):  38-42. 
    Asbtract ( 1533 )  
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    The values of rock sample are random and fuzzy.Both of the random-fuzzy approach and the traditional method were applied to analyze the mechanical parameters of slope engineering.After comparison，it is concluded that the random-fuzzy approach is superior to the traditional method.Also，the confidence degree and probability distribution form of mechanical parameters were discussed.Then，the confident threshold concept was proposed so as to provide a foundation for its application in engineering practice.
    Experimental Study on Large-diameter Long Hole Mining Techniques at Tonglushan Copper-Iron Mine
    Huang-Zhi-Wei, WANG Bao-Shan, ZHOU Guo-Jun
    2010, 39(5):  43-46. 
    Asbtract ( 2350 )  
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    The large-diameter long hole mining methods are used at Tonglushan Copper-Iron Mine.Frequent rock-falls within stopes for many years have interrupted production and brought great ore loss and pollution.The investigation showed that the bad rock and unreasonable drilling and blasting were the main inducing factor of stope collapse.For this，VCR blasting was changed into the lateral retrogressive millisecond control blasting with charging weakened，and the decouple charging method was adopted for the holes with instable rock mass and stope sides.The in-hole propagation of detonation showed that the propagation distance of the decouple charging blasting could be over 6 m.Without denotation，the next charging can be blasted directly.By this way，two small sections of charging can be merged into one section.This method simplifies the charge structure，and it is convenient for implementing the charging process.To reduce the blasting dust and the waste rocks transport，the water-seal blasting was adopted in tests.Good expected results were obtained through the trial at 7313 stope in the past one year，and all of the collapse problems above in the mine were solved in the later by applying the new methods.
    Nonlinear Deformation Analysis of Lifting Pipe of Deep Seabed Mining
    XU Zhao-Mei
    2010, 39(5):  47-50+54. 
    Asbtract ( 1740 )  
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    Lifting pipe of deep seabed mining not only undertake the function of minerals conveying，but also endure the weights of systerm.It endures wave force，ocean current force，seawater，pressure，wave dynamic lodot.The deformation and stress are very comolex and possiblly bring hidden trouble to the system.This article use the mechanics and limited finite element idea to disperse the whole pipe.The distortion curve is drawn in various circumstance by the iteration programming.By analyzing the nonlinear distortion on lifting pipe，the conclusion that the remining ship's rclocity opposite the ocean flow is the crucial factor affecting the lifting pipe of deep seaded mining pipe distortion is drawn，which has a higher reference value to the design of lifting pipe and intensity checking.   
    An Optimizing Model for the Exploitation of Single Mineral Deposit On the Basis of Goal Programming
    ZHENG Ming-Gui, WANG Wen-Xiao, CAI Si-Jing
    2010, 39(5):  51-54. 
    Asbtract ( 1788 )  
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    Based on the optimization principal of goal programming，an optimizing model for the exploitation of single mineral deposit was built.After solving by HJ arithmetic，the conclusion is made that since the geologic resource of Baixiangshan Mine is very rich，and its production can reach the up-limited scale，but funding still become the key factors to the production extending.The research results showed that the development mode of new mineral resources can realize the good sustainable development capability of Gushan mine or better with good effects.  
    Technological Mineralogy and Separability Study of Mined Ores of Qidashan Iron Mine
    CHEN Wen
    2010, 39(5):  55-59+80. 
    Asbtract ( 1792 )  
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    The strengthening of scientific and technological progress，the great significance of exploiting and utilizing China's refractory iron ore resources which are characterized by low grade，fine grain and complicated composition based on high efficiency and low consumption were described.The difficulties of key technology in processing different types of refractory iron ores were analyzed based on author's research work and productive practice.The high efficiency and low consumption ore dressing technologies suitable to exploit and utilize ultra-low grade magnetite，micro-fine grained hematite，siderite and limonite ores were discussed respectively.     
    Dressing Experimental Study of a Low Grade Molybdenum Ore
    ZHANG Yan-Jiao, ZHAO Ping, LIU Guang-Xue, WU Dong-Yin, WEI Min
    2010, 39(5):  60-63+116. 
    Asbtract ( 1590 )  
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    Molybdenum ores are the important strategic resource.The resoures are very large with low grade and low-level utilization in china.Based on the low grade molybdenum ore property  in  Henan province，a experimental study has been conducted.The flotation flow-sheet of  primary grinding and roughing，cleaning of the rougher concentrate by use of two-stage regrinding technology was adopted.The better index can be obtained with molybdenum concentrate grade of 47.23% and  recovery rate of  81.51%.
    Research on Magnetic Roasting and Leaching Dephosphorization of High-phosphorus Oolitie Hematite in Western Hubei
    LI Yu-Biao, GONG Wen-Qi, XIN Zhen-Kai, PI Ke-Wu, HU Chun
    2010, 39(5):  64-67. 
    Asbtract ( 1709 )  
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    Roasting -magnetic separation was used to treat a high-phosphorus oolitic hematite in western Hubei(iron grade at 43.50%)，dephosphorization methods，including acid leaching and bioleaching，were used for the iron concentrate.The results showed that,under the condition of roasting at 850 ℃ for 25 min，reductant to ore ratio of 5%，grinding time of 4min，magnetic field strength 120 kA/m，the iron concentrate grade was 54.92%，iron recovery rate was 86.78%，with P 0.83%; in the acid leaching test，pulp density was 2%，with 0.1 mol /L of H2SO4，HNO3，HCl，C2H2O4，C6H8O7 for phosphorus removal，in which H2SO4 was the most effective，and the iron grade，recovery rate，phosphorus removal rate were 57.98%，96.47%，95.30%，respectively; in the bioleaching test，pulp density was 2%，with the filtrate of the Acidophilic Thiobacillus ferrooxidans (At.f)  and the  Aspergillus niger  on iron concentrate ore，the phosphorus content were  0.23%, 0.20%, respectively.
    Investigation on Dephosphorization and Magnetic Separation of  High Phosphorous Iron Ore by Biomass Reduction Roasting
    XU Di, ZHU Guo-Cai, CHI Ru-An, ZHAO Yu-Na, YUAN Shuo
    2010, 39(5):  68-72. 
    Asbtract ( 1807 )  
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    Magnetic conversion process was investigated by biomass reduction roasting and the phosphorus in ore was removed successfully of a Hubei western high phosphorous hematite ore，The iron grade was improved greatly by further dynamic magnetic method.The effects of technological conditions such as roasting temperature，roasting time，the ratio of hematite and biomass on magnetic conversion rate of hematite ore and dephosphorization rate were investigated.The magnetic separation conditions such as stirring speed and magnetic separation time were investigated too.Iron grade could reach more than 64.05%，dephosphorization rate reach more than65.64% under the optimal condition which was determined as the amount of biomass at 20%，roasting temperature at 650 ℃ for 40 min，stirring speed at 600 r/min for 40 min.
    Research on Mineral Processing Test for a Refractory Siderite in Yunnan
    BAI Shao-Jun, WEN Shu-Ming, LIU Dian-Wen, ZHANG Wen-Bin, DING Yue-Hua
    2010, 39(5):  73-76. 
    Asbtract ( 1942 )  
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    Yunnan a siderite ore is a refractory one due to its low grade and its complex mineral dissemination particle sizes and its high content of phosphorus.Based on its process mineralogy research，a process consisting of reverse flotation-magnetization roasting-low gradient magnetic separation was adopted for treating this ore.As a result，an iron，its P-content is reduced to 0.06%，S-content is 0.35%，Si-content is 9.45%，concentrate grading 68.22%，at a recovery of 65.72% was obtained，thus providing a new way for the separation of similar high phosphorus siderite ore.  
    Experimental Research of Biooxidation Pretreatment on How to Enhance Gold Leaching Rate From a Refractory Gold Ore Containning Copper
    XIA Qing, WANG Jian
    2010, 39(5):  77-80. 
    Asbtract ( 1841 )  
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     The conventional thiourea leaching rate of gold from flotation concentrate of the refractory ore containning copper from Jiangxi province was only 48.71%.With oxygen-rich biooxidation leaching technigue，the gold leaching rate is enhanced to 91.67%.In view of the high controlling conditions，the oxygen-rich and low temperature leaching technique is not suitable for real popularizing .Hypoxia biooxidation leaching research was carried out and magnetic field was introduced to intensify biooxidation.The gold leaching rate reached 91.72%，a better rate .The mechanism of the biooxidation intensified by magnetic field is analyzed.
    Subsection Potential -Controlled Floatation of A Lead-Zinc-Silver Sulfide Minerals
    WEI Zhen-Ming, PAN Ju-Fen, LAI Chun-Hua, CHOU Ya-Ling
    2010, 39(5):  81-85+88. 
    Asbtract ( 2021 )  
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    Introduced a new technology of floatation—Subsection potential-controlled floatation，which improved recovery of lead-zinc-silver sulfide mine，especially to the recovery of silver.Application of this technology was proved very effective to lead-zinc-silver sulfide mine in Yunnan.Compared with conventional floatation techniques，the recovery of lead improved 6.38%，and the recovery of zinc improved 4.33% and the recovery of silver improved 13.43%.
    Technological Mineralogy and Separability Study of Mined Ores of Qidashan Iron Mine
    XUE Min
    2010, 39(5):  86-88. 
    Asbtract ( 1391 )  
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    The iron concentrate grad separated from qidashan iron mine fluctuated frequently, which affected the consistent production.In order to reduce the fluctuant times, partitioned the mining area of qidashan iron mine into 4 areas, carried out the technological mineralogy and separability study to the 3 areas' ores which affected the indexes, and got the result that only by reasonable ore blending could realized suitable utilization of ores. 
    Experimental Study on Process of Microwave Magnetizing Roast plus Magnetic Separation for〖JZ〗Medium-low Grade oxidized Ores Containing Hematite of Bayanobo
    LI Jie, ZHANG Bang-Wen, LI Bao-Wei
    2010, 39(5):  89-91+182. 
    Asbtract ( 1779 )  
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    Microwave-assisted magnetizing roast plus magnetic separation was carried out upon Baiyunebo medium-low grade oxidized ores containing hematite.The effects of sintering temperature，carbon content,sintering time on the reduction and the effects of sintering temperatures on the magnetic separation effect were investigated.The results showed that in the case of roasting temperature of 650 ℃，carbon content of 0.5% and roasting time of 10 min，the best magnetisability 2.36 could be obtained，near to the theoretical value 2.33.But owing to powder sintering at high temperatuer，the best magnetic separation efficiency occurs for the sintered ore at 570 ℃，insteads of 650 ℃.For this concentrate，a further ball-milling plus magnetic separation produces two kind of final concentrate，according to the different stiring current one is in grade 65% and recovery 58.6%，the other is in grade 63% and recovery 72.8％.In this two concentrates，the content of impurity elements such as S，P，SiO2，K2O etc.were so low as to meet the require of iron-smelting，while the rare earth was found enriched up to twice and more in the resulting tailings.
    Applications of Image Processing Techniques in Process Mineralogy
    NIU Fu-Sheng, ZHANG Yue, NIE Yi-Miao
    2010, 39(5):  92-95+103. 
    Asbtract ( 1622 )  
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    Inview of depending on manual work，great labour strength，low accuracy,and be subject to the capability of optical system of the traditional microcospic examination of technological mineralogy.Used the devices of opticalimaging，combined with image processing techniques,picked up the speed of determination，improved the accuracy.The data also have some guidance to the design of  mineral processing technology.
    Restrictive Factors of Refining Effect of Alkali-acid Method
    GE Peng, WANG Hua-Jun, ZHAO Jing, JIE Lin, ZHANG Qiang
    2010, 39(5):  96-98+103. 
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     The alkali-acid method is a main way of purifying graphite，which is widely applied，but the refining effect is not very good.The fixed carbon content of the graphite product which was achieved by the alkali-acid method was generally less than 99.9%.In this study，the restrictive factors of refining effect were obtained through the analysis and detection of graphite samples and filtrates in the different stages of technological process.After immersion and washing treatment，Si impurity wasn't complete removed，but it was easy to form silica gel which was very difficult to be eliminated.So it would limit the graphite purity to be enhanced.The test material with high ash content also affected refining effect.
    Study of Chromite Fines Pellet Sintering and its Hardening Mechanism
    ZHU De-Qing, ZHANG Hong-Liang, PAN Jian
    2010, 39(5):  99-103. 
    Asbtract ( 1895 )  
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    The normal sintering and pellet sintering of chromite fines was studied and the consolidation mechanism was revealed.Results of normal sintering showed that under the optimum conditions,yield of 73.16%,productivity of 1.17 t/（m2·h）,tumble index of 61.03% and solid fuel consumption of 115.80  kg/t were achieved.In contrast the pellet sintering of chromite fines under optimum conditions indicated better sintering performance proven by the following dexes yield of 77.18%,productivity of 1.47 t/（m2·h）,tumble of 83.78% and solid fuel of 107.32  kg/t respectively.Consolidation mechanism showed that in normal sintering process，the liquid phase was only accounted for 19% and higher porosity，resulting in weak sintering and lower productivity.With regard to micro  pellet sintering，sinter from top and middle-lower bed is ding morphology，respectively.Recrystallization of ferro-chromium and ferro-magnesium spinel and some 19% liquid phase along with lower porosity play a significant role in consolidation of sinter made of chromite fines by micropellet sintering，leading to a strong sinter and higher productivity at lower solid fuel.Therefore，pellet sintering is an effective way to promote sintering of chromite fines at lower solid fuel consumption .
    irect Reduction Iron with Pellets Containing Organic Binder and Pore-forming Agent
    SUI Yan-Li, QI Chao-Ying, HAO Jun-Jie, LIU Xiang-Qing, GUO Zhi-Meng, LIU Shu
    2010, 39(5):  104-106. 
    Asbtract ( 1580 )  
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    Process parameters of direct reduction of pellets containing organic binder and pore-forming agent，in which the refined iron ore was from Chengchao Iron Mine as well as the reducing agent was coal，has been investigated.The result shows that the appropriate weight ratio of refined iron ore，pore-forming agent and organic binder was 20∶1∶5.When reducing at 1 250 ℃ for 5 h as the weight ratio of coal and pellet was 1∶3，the total Fe of DRI was more than 93%.Because of the effect of pore-forming agent，the reducing time was reduced to 5h as to more than 15h other reference mentioned.Then the power cost could be decreased greatly.
    Study on Geospatial Data Organization of Mine Based on Geographic Ontology
    DAI Lu, LI Cheng, PENG Ming
    2010, 39(5):  107-110+116. 
    Asbtract ( 1573 )  
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    The proposal of “Digital Mine” has brought new opportunities and challenges for the informationization construction in coal mines.This paper used the idea of geographic ontology to represent the coal mine，and put forward a new geospatial organization method based on geographic ontology，the analysis of layering-oriented and feature-oriented way of spatial data organization，as well as the metadata technology.The coal mine ontology is modeled which includes a conceptual model reflecting the hierarchy of the coal mine，then a spatial database of the coal mine based on geographic ontology is reconstructed according to the mapping relationship between coal mine concepts and exiting multi-source geospatial datasets.By this way，the integration and management of the spatial data of the coal mine can be realized，and the multi-source spatial data of coal mine was well organized.And it is good for the semantic sharing and inter-operation of the spatial information.
    The Through Design and Practice of Auxiliary Slope-shaft Project for Deep Digging in Shangping
    GAN Zheng-Ru, ZENG Xian-Gui
    2010, 39(5):  111-116. 
    Asbtract ( 1729 )  
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    The main task of making the through design is to select a reasonable measure proposal and method to ensure the roadway right through．According to the practice of Shangping mining area，an appropriate measure approach is selected to make error calculation and assessment in advance.Based on this，the measuring practice and its accuracy analysis for deep extension of new auxiliary slope-shaft in Shangping mine are mainly introduced．Taking correct and stable coordinates and elevation of the starting point N2 and the azimuth of the starting side N1-N2 as original data，the traverse measurement of coordinate，azimuth and elevation is carried out.The project was put into practice in September，2005 and completed smoothly in 2006.The through engineering not only guaranteed the diagraph accuracy of measurement，but also ensured that the actual deviation of the through engineering was lower than the limited error and near to the anticipating error by the practical measure.
    Ore-controlling Factors and Ore Prospecting Analysis of Qingshan Gold Deposits，Shanxi
    YANG Zhong-Fang, LIU Xing-De, WEN Hai-Xia
    2010, 39(5):  117-119+123. 
    Asbtract ( 1962 )  
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    Longwanggou ore area of Qingshan gold mine is in the north of Eastern Qinling Zhen'an-Xunyang basis in the Qinling Plate，and is in west-line of Jinlongshan-qiuling metallogenic belt.Research on this deposit is still blank.Based on the geological survey on this deposit，its ore-controlling factors and the geological-geochemical characteristics are studied，and its causes are analyzed as well.In combination with nearly one-year researches，the mineralization and ore-controlling factors and ore prospecting direction in future for Longwanggou mine area of Qinshan Gold Mine are pointed out.This result provides a reference for further study on the deposit，and also accumulates new information for the regional metallogenic theory of Zhen-xun basis.
    Study on the Tangent Calculation Method of the Main Influencing Angle Based on SVM
    WEI Hao, DENG Ka-Zhong, LU Zheng, FAN Hong-Dong
    2010, 39(5):  120-123. 
    Asbtract ( 1972 )  
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    The tangent of the main influencing angle is an important parameter for mining subsidence prediction and surface displacement range demarcation.On the basis of the relationship analysis between the tangent of the main influencing angle and the geologic and mining conditions，the data from the typical ground movement observation stations of China was used as training samples.With a reasonable selection of kernel function of SVM，penalty parameter C and insensitive loss parameter ε,a SVM regression relationship model of the tangent of the main influencing angle and the other factors was established to predict on the samples.The results showed that the SVM prediction method is accuracy and can be applied to the actual engineering.Multiple influence factors could be considered comprehensively in this method，and a new approach to quickly and accurately calculate the tangent of the main influencing angle is proposed for the future.
    The Study of Integrated Detection Method to the Mined-out Areas in Open Pit Iron Mine and its Application
    Men-Ye-Kai, FAN Guang-Hai, SHAO An-Lin, JIA San-Shi, WANG 恩De, YANG Yi-Biao
    2010, 39(5):  124-127. 
    Asbtract ( 2156 )  
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    The high density electric resistivity method and the seismic imaging method were adopted to detect the mined-out areas of open pit iron mine，and then the results of detection are analyzed and contrasted，which will make up the disadvantages of this method，like blind detecting spot of the high density electrical method，easily being influenced，and difficult to position by the seismic imaging method.This method accurately predicted the distribution feature of the mined-out areas under the ground about 40 meters，and solves the detecting problem of the underground mined-out areas in open pit iron mine.By this way，three mined-out areas were found in this region，and the distribution range is given.All of these provide a reliable basis for management of the mined-out areas.
    Modal Analysis of Rotator of Ball Mill Based on ANSYS
    HAN Yan, MEN Qing-Yi
    2010, 39(5):  128-130+147. 
    Asbtract ( 1844 )  
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    Using ANSYS to analyze the modality of the Φ3.8 m×13 m ball mill's rotator，got the former ten modal natural frequencies and vibration modes.Through the modal analysis，found the position which may be easily destroyed.Then made the structure improvement，and the dynamic performance of rotator has been improved.
    Digital Control System of Electromagnetic High Frequency Vibrating Screen
    LIU Wei-Sheng
    2010, 39(5):  131-132+139. 
    Asbtract ( 1908 )  
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    The digital control system of electromagnetic high frequency vibrating screen combines the technologies like computer，electronics，and network systems，which replaces the traditional potentiometer-type control.It can precisely control screening parameters and also significantly reduce the operation difficulty.The operator can control the entire screen machine on site，and also optionally set and verify the working parameters and the historical records of the electromagnetic screening system.A good man-machine interface makes the operation intuitive and simple.It is so widely used in mineral processing，coal concentration and brick preparation etc.The screening efficiency can be greatly improved，meanwhile，labor intensity be reduced and the management level improved.Its innovation is to achieve on-site control and remote centralized control，so the electromagnetic screen control level has been improved with great economic and social benefits.
    Intelligent Diagnosis System for Mining Dump Truck Self-lubrication System
    JIANG Yu-Xiu, HUANG Peng-Chao
    2010, 39(5):  133-135. 
    Asbtract ( 1943 )  
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    In view of the complicated self-lubrication system of mining dump truck，it is very difficult to obtain fault diagnosis conclusion rapidly relying on manual work.The fuzzy theory was adopted to make the intelligent fault diagnosis for this system.It will be beneficial to improving the service life of this system，and is of great significance and broad value for improving the service life of the mining dump truck and its productivity，and reducing the costs.
    Full Automatic Control System of the Water-Separated Slurry Pump
    Huang-Xiao-Yun, TIAN Yu-Cai, SUN Ping
    2010, 39(5):  136-139. 
    Asbtract ( 2426 )  
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    The Water-Separated Slurry Pump is a kind of pressure-adding equipment used in slurry pipe transportation，which  is widely applied in tailings pipe transportation.The control system is its core technology and has significant effects on the performance indexes.The composition and working principle of the Water-Separated Slurry Pump wete introduced.The hardware composition of the full automatic control system of the slurry pump was studied.By theoretically analyzing and combined with practical experiences，the control system's fulfillment mechanisms for the relevant control functions were studied，and the fulfilling methods were illustrated.It's proved that，with stable，accurate and fast control characteristic and clear working state display of the slurry pump，the full automatic control system enhanced the pump's lifetime，reduced water lose，decreased working intensity of the operaters.
    Visualization Analysis of Mining Subsidence Prediction Based on ArcGIS
    Bai-Li-Gai, TAN Zhi-Xiang, LIU Cong-Liang, LI Pei-Xian
    2010, 39(5):  140-142+157. 
    Asbtract ( 1849 )  
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    The surface displacement caused by mining is a sophisticate dynamic process.The traditional two-dimension line graphic can't explain the information of surface subsidence completely and precisely.Based on the geo-statistics model of ArcGIS，the prediction results of probability integral method are dealt with，which makes three-dimension display and section image of mining subsidence realized.This method contributes to the intuitionist and profound research of surface displacement and also provides a more intuitive and effective way to research laws of mining subsidence and improve measures of mining protection.
    Bayes Discriminant Analysis for Classification and Prediction of Rockburst Intensity
    ZHAO Guo-Yan, LIU Qiang, LIU Chao
    2010, 39(5):  143-147. 
    Asbtract ( 2031 )  
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    In view of many uncertain elements in classification and prediction of rockburst intensity，the evaluation model for classification and prediction of rockburst intensity is established by Bayes discriminant analysis.According to the characteristic and cause of rockburst，three factors of the stress coefficient of rock，the brittleness coefficient of rock   and the elastic energy index of rock   are selected as the discriminant factors.And the intensity of rockburst is divided into 4 grades，denoted as none，inferior，medium and intense，which are taken as the four normal populations in Bayes discriminant analysis.The classification discrimination is carried out based on the initial data for rockburst intensity analysis of 14 rock projects around the world.Bayes linear discriminant function is obtained through the training samples，which is then used to calculate the Bayes function value of the evaluating samples.Meanwhile，the population corresponding to the maximum function value is used to judge which population the evaluating sample belongs to.In order to verify the effectiveness and feasibility of the model，the cases of Qinling Tunnel and Fankou Lead-Zinc Mine are analyzed using the proposed method，and the obtained results are also compared with the results of neural network model，fuzzy probability model and practical conditions.The results show that the results predicted by Bayes model are both in good agreement with the practical conditions and the results obtained from the neural network model and fuzzy probability model.
    Stability Analysis of Basalt Nude Inclined Shaft Surrounding Rock
    WANG Dong, LIU Chang-Wu, DING Yu-Qiao
    2010, 39(5):  148-150+164. 
    Asbtract ( 1804 )  
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    The digging of underground laneway will destroy the balanced state of the initial rock stress，making the stress field around laneway redistribute and concentrate.When the concentrated stress is higher than the rock mass strength around laneway，it will cause ground pressure behaviors，for example surrounding rock deformation，loosening，floor heave and so on in laneway.Evidently，the severe degree of ground pressure behaviors is not only relevant to the rock pressure，but also interrelated with the physical and mechanical properties of the rock around laneway.Aiming at the stability of basalt nude inclined shaft surrounding rock of a under-construction mine in Southwest China，based on the knowledge of elasticity and rock mechanics，the comprehensive analysis method of the theoretical analysis and numerical simulation is adopted to analyze the highest concentrated stress of surrounding rock and the relationship between the highest concentrated stress and the approved strength.It is concluded that the highest concentrated stress of surrounding rock is lower than the approved compressive strength of basalt rock mass in the worst condition，the inclined shaft can take the shape of nude laneway，and it provides a scientific theory basis for the field support design and construction.
    Application of Fuzzy Mathematics in the Ecological Landscape Assessment of Pingguo Bauxite Mine
    CHEN Hai-Tao
    2010, 39(5):  151-153. 
    Asbtract ( 1609 )  
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    The quality of mining ecological landscape is one of important index that reflect the degree of mine environmental destruction and after-effect of ecological recovery.The traditional evaluation method in landscape quality assessment has been deficient.Hence，how to seek a better evaluation method is the focus of mining enterprises and scientific research workers.Based on unique geological features of Pingguo bauxite deposit，the fuzzy and comprehensive evaluation method was adopted to conduct the optimized research to the mining area land planting mode，and displayed the built-up sequence and the spatial distribution situation of various vegetations planting.And the results are basically consistent with the reality of mine.This method has a practical significance to ecological landscape design and environment restoration of the mining area.
    Reliability Analysis on Anti-sliding Stability for Dumulong Tailing Dam
    ZHANG Yang, QIN Wei-Xing, ZHANG Yue-An, WANG Yi-Jiang
    2010, 39(5):  154-157. 
    Asbtract ( 1584 )  
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    Monte Carlo method was introduced in anti-sliding stability analysis and assessment for Dumulong tailing dam.Considering the influences of the variability of tailing mineral parameter such as the cohesive force，internal friction angle，bulk specific gravity and uncertainty of pore-water pressure，the stability safety factor and its reliability index of the tailing dam are calculated.Both security indices show that the stability of the dam is in critical condition.Then the pore-water pressure is determined as the most leading factor for affecting the instability of the dam by the sensitivity analysis of these random variables.And then the reinforcement measures on improving drainage facilities in the dam are suggested accordingly.The research method adopted in the paper has a reference for analysis and evaluation of similar tailing dams' stabilities.
    Study on the Adsorption by Water-quenched Slag In Rare-earth Ammonia-nitrogen Wastewater
    CHEN Li-Rong, JIA Fei-Hu, DOU Yan-Ming, MENG Xin
    2010, 39(5):  158-160. 
    Asbtract ( 1686 )  
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    The process and action mechanism of the rare-earth ammonia-nitrogen wastewater adsorption treatment by water-quenched slag were studied.Results showed that under the conditions of diameter of 100 mL，dosage of 0.015 g/mL，reaction time of 60 min to treat the wastewater of 127 mg/L ammonia nitrogen without adjusting the pH value，the removal rate of the ammonia nitrogen reached 60%.According to the adsorption equilibrium experiment the adsorption data fit the Freundlich equation.
    Research on the Floatation Wastewater's Property of Copper-lead-zinc Minerals
    MI Li-Ping, SUN Chun-Bao, ZHOU Feng, SUN Ti-Chang
    2010, 39(5):  161-164. 
    Asbtract ( 1719 )  
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    The research object is floatation wastewater，through reusing it in the floatation for many times，the changing regularity of the wastewater index were obtained，including SS,COD，and the metal iron concentration.The evaluation of wastewater had been also made from the point of effect to floatation process and its products，taking content of lead and zinc in copper concentrate as criteria，which offered basis for treatment and reuse of wastewater.
    Research and Application of 3D Modeling Visualization to Mined-out Area of Solid Minerals
    QI Fei, LIU Xiu-Guo, LI Yun-Feng
    2010, 39(5):  165-167+188. 
    Asbtract ( 1949 )  
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    Mined-out area survey as the part of mineral resource exploration played an important rule in recovery of mined-out area and mine safety control.The grasp of mined-out area shape and the distribution of solid minerals in mined-out area is the important basic work for mineral management.Based on the real survey data of mine area，the key technology of mined-out area 3D modeling visualization is introduced.With the help of mineral reserves evaluation and iExploration-EM of 3D modeling system，the development of mined-out management model is realized.In combination with the 2D geological information management，a good effect is obtained by adopting the transparent mineral entity model and 3D mined-out area entity model under the same situation.
    Information Extraction Method of Iron-copper Polymetallic Mining District and Solid Waste
    LIU Feng-Mei, WANG Shao-Jun, ZHANG Zhi, ZENG Min
    2010, 39(5):  168-170+174. 
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    Long-term piling for large quantities of solid waste produced in mining would lead to serious environmental problems，and it is urgent for application to rapidly survey  the distribution of solid waste.Taking southeast of Hubei as the study case，based on the spectral characteristics of solid wastes and the iron and copper polymetallic mining district，and according to the spectral characteristics of TM data and the iron staining information extraction program in geological prospecting，the information extraction methods of the iron and copper multi-metal mining district and solid waste was designed with principal component analysis method.Then，the information of the iron and copper polymetallic mining district and solid waste were successfully extracted.In combination with the extraction results and the known gold deposits points and the solid waste recognized based on high resolution remote sensing data，it is shown that this program is feasible for the information extraction of iron and copper polymetallic mining district and solid waste.This study provides a corresponding reference for extraction of iron ore solid waste based on medium resolution remote sensing data.
    Besource Recovery Optimization Model of Industrial Solid Waste
    DENG Qi, WANG Qi, HUANG Qi-Fei, WANG Qun-Hui
    2010, 39(5):  171-174. 
    Asbtract ( 1763 )  
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    Based on the principle of Analytical Hierarchy Process，from economy，environment and resourced of industrial solid waste，set up the preferred hierarchical structure moldel took the pyrite cibler procluced by shandong a chemical plant as example，accorcling to the unique demand of resourced pyrite cinder，optimized schemes decision-making for pyrite cinder which could be referred by govermment and environmental policy makers.
    Extracting and Separating of Valuable Metals From Molybdenum Tailings
    QIN Hong-Bin, ZHANG Hai-Long, XU Li-Hua, REN Ling-Ling, ZHANG Zuo-Shun
    2010, 39(5):  175-178+188. 
    Asbtract ( 2048 )  
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     Extracted and separated valuable metals，like Fe，Ca and Mg，from molybdenum tailing in Luanchuan by Hydrometallurgy method.The results showed that the leaching ratios of Fe，Ca and Mg could reach 86.15%，83.29% and 80.24%，respectively，when the tailings were leached in 20% hydrochloride acid for 6 h under the water temperature at 95  ℃.Also，the purity of the related compounds containing Fe，Ca and Mg were up to 98.27%，97.97% and 83.07%，respectively.After the aid leaching mentioned above，other valuable elements，such as Mo，Cu and W，were naturally enriched.It would save the cost in the later extracting process.
    Effect of Additive on the Performance of baking-free Brick  Made from the Hematite Tailings of Western Hubei Province
    CHEN Zhang, ZHANG Yi-Min, CHEN Tie-Jun
    2010, 39(5):  179-182. 
    Asbtract ( 1663 )  
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    In order to increase the strength of baking-free brick made from the hematite tailings of western Hubei province，under the condition of determining the optimum value of the early strength agent，carried out the optimum value test of complex adding early strength agent and water reducing agent，then obtain the optimum complex additive.Through studying the impact and hemechanism of action of the additive on the performance of baking-free brick，and analyzing the mechanism of action by SEM，the complex additive is benefit to accelerate the product of AFT and gelatum and is the key factor of increasing the compressive strength of baking-free brick.
    Effect of Oxidative Pressure Leaching on the Extracting of Indium and Zinc from Zinc Oxide Flue Dust
    WEI Yan-Song, WU Zhi-Hong, ZHANG Yan-Juan, LI Xuan-Hai
    2010, 39(5):  183-185+190. 
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    In the reaction of indium-bearing zinc oxide flue dust (ZOFD) with industrial sulfuric acid by oxidative pressure leaching in an autoclave，the effects of different technological conditions，such as initial concentration of sulfuric acid，reaction time，temperature and the dosage of oxidant，on leaching efficiency of indium and zinc were studied.The experimental results showed that the extraction of indium from ZOFD can be enhanced effectively by both pressuring and using potassium permanganate as oxidant.The optimum conditions of pressure leaching were determined as 400 g/L sulfuric acid for 120 min at 120 °C with the dosage of KMnO4 was 4% (wt.% ) of ZOFD.The leaching rate of indium can reach 90.6% under these optimum conditions.Simultaneously，the process of oxidative pressure leaching could also strengthen the zinc extraction from ZOFD，but the effect was not obvious.
    Study of Sintering Perforated Brick Technology Using Iron Ore Tail
    SUN Tian-Hu, REN Jing-Cheng, 吕Li-Hua
    2010, 39(5):  186-189. 
    Asbtract ( 1790 )  
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    The tailing belongs to Handan-tailing which is a high calcium and magnesium tailings.The main mineral componentis are quartz，dolomite，chlorite，mica，calcite，etc.; The average partical size of the mineral is 0.08 mm，-0.037 mm for the purpose of 45.82%，viscous particle content of 28%.The plasticity of the tailings is better，and drying sensitivity of the tailings is lower.All tailings in condition of the 17% increase water，by mixing，extrusion and forming could make 22 mm×58 mm×50 mm cylindrical samples，sintering at the temperature of 1 080~1 170 ℃ after natural dry.After experimental evidence，it's feasible to produce fired perforated brick using all the iron ore mining that company tailings，and its performance fully meet the requirements of GB13544-2000 standard and the middle strength for the MU15.