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Table of Content

    15 November 2008, Volume 38 Issue 11
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    Review of China's Progress in Beneficiation Technology for Refractory Iron Ores
    LI Wei-Bing, SONG Ren-Feng, LIU Hua-Yan
    2008, 38(11):  1-4+132. 
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    The paper presents the distribution of refractory iron ore resources and the research of their beneficiation technology in China, analyzes the properties of these iron ore, and the features and existing problems in their beneficiation technology progress, and makes suggestions on speeding up China's progress in beneficiation technology.
    Dynamic Optimization of Mine Technical and Economical Indexes and Its Application Research
    PAN Gui-Hao, MING Shi-Xiang, WANG Yan-Hui, YIN Sheng-Hua
    2008, 38(11):  5-8+42. 
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    In light of the actual production conditions of Luzhong Mining Corporation and the complex ever-changing external market, and based on the investigation of its accumulated actual production data, data mining is made of the mine internal indexes. The system of technical and economical indexes and multi-objective overall-dynamic optimization model for the mine are constructed. The synthetic optimization theory of the mine technical and economical indexes is established by loop search algorithm, fuzzy synthetic evaluation and AHP, realizing a dynamic and real-time optimization of the mine technical and economical indexes and providing an important basis for making decisions in relation to the operational parameter adjustment and distribution.
    Application of Sublevel Rock Drilling and Stage Room Stoping in Jinling Iron Mine
    LI Ming, LI Li-Qun, ZHAO Yong
    2008, 38(11):  9-11. 
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    Sublevel rock drilling and stage room stoping is a typical method adopted in Jinling Iron Mine. To suit continuously changing external conditions, under the common efforts of the engineering and technical personnel of the whole mine, the stoping method has now adopted a high sublevel instead of the original low sublevel, which has not only reduced the production cost but also raised the mine's technical and economical indexes such as the mining intensity, labor productivity and operation safety. It has also widened the standard design plan for stage room stoping and therefore, has a double-value of both practice and theory.
    Test Research on the Blasting Ignition in Borehole Sequence in Karst Developed Limestone Quarry
    REN Xiang, GUO Xue-Bin, GUO Fang, TANG Jing, JIANG Xiao-Heng
    2008, 38(11):  12-15+73. 
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    Karst may lead to a leakage of blast energy, seriously affecting the rock fragmentation and blasting effect. Adjacent borehole explosion may cause a large area of misfire due to sympathetic detonation. In case of ignition in borehole sequence, each blast hole has three or more free faces, which will facilitate the rock throw-out and the ignition of adjacent blast holes at different times can avoid the occurrence of stress reduction area. The key of the technique of blasting ignition in borehole sequence lies in credible precision detonator system, rational millisecond between bore to bore and row to row and correct blasting network design. The test of ignition in borehole sequence carried out at a karst developed limestone quarry has proven that this technique can improve the blasting effect, evidently reduce the blasting caused vibration, decrease the comprehensive production cost of mine and effectively prevent a large area of misfire and improve the mine safe operation level.
    Compound Energy Dynamic Mechanism of Rock Burst
    MIAO Jin-Li
    2008, 38(11):  16-19+24. 
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    Rockburst occurs due to many complex factors. It is extremely difficult to find its essential peculiarity based on in-situ phenomena. The paper, based on the analysis of various rockburst energy mechanisms, proposes a rockburst mechanism based on compound energy, which indicates that the energy superposition after a rapid rupture of rock mass causes the dynamic fracture of engineering wall rock. The process from quasi static to dynamic coal rock motion involving crack initiation, extension and running-through is analyzed with the criteria of energy involved in the rapid crack initiation of rock mass. The theoretical basis for the application of the crack arresting technology based on compound energy conditions in rockburst control is described from the rock mass  characters of unloading and rheology.
    Mechanical Analysis of the Damage and Fracture of Rock Fragmentation Under Combined Dynamic and Static Loads
    XIE Shi-Yong, LU Hua, ZHAO Fu-Jun
    2008, 38(11):  20-24. 
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    The paper analyzes the load-fracturing depth cure of rock fragmentation under combined dynamic and static loads and concludes that the reasonable loading point of the combined loads is at a time when there is a rock volumetric fracture, debris outbreak and then a sufficient compression of the original compacted body. A fracture and damage mechanics analysis is made of the rock fragmentation under dynamic-static combined loads. It is concluded that broken volume will increase rapidly with an increase in the static pressure and impact in certain scope, thereby enhancing the efficiency of rock fragmentation; and the best effect of rock fragmentation will occur when an impact load is applied after a volume fracture due to the pre-static load.
    Application of Seismic Reflection Method in Tunnel Advance Forecast
    XU Bai-Qing, PAN Hua, BAI Ju-Bo
    2008, 38(11):  25-27+62. 
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    The paper describes the application of seismic reflection method in the advance forecast of Miaoshan tunnel of Huaixin express highway and introduces the features of this geological advance forecast method that is commonly used in tunneling. Advance geological forecast can provide reliable geological data and information for a rapid tunneling, preparation of support materials and effective prevention of disaster accident. The effectiveness of the seismic reflection method in advance forecast is illustrated.
    Optimization of the Stope Structural Parameters for Deposits with Instability Tendency and Energy Catastrophic Analysis of Its Stability
    SHEN Li-Yuan, YANG Guan-Tao, LIU Ke-Wei, CHEN Hong-Jiang
    2008, 38(11):  28-30+89. 
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    The paper discusses the optimization of the stope structural parameters for deposits with instability tendency. With average energy release rate as the optimization target, a general method for optimizing the stope structural parameters for deposits with instability tendency is proposed based on the combination of numerical modeling and orthogonal design. By using the optimization method and procedure modified by the authors, the stope structural parameters of a deposit with instability tendency are optimized for the mining design of this deposit. Its stability is also studied by adopting energy release theory, providing a reliable basis for the practical mining.
    Burning Front of Initiating System Design
    CHENG Ping
    2008, 38(11):  31-32+96. 
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    Discussion is made on the influencing factors of initiating system design on blasting in applying large area multiple-row blasthole short-delay explosion system in open-pit mines.The concept and property of the burning front in the design of such explosion system are described and the case study is made on the design of its burning front，providing important reference to the blasting system design and laying a good foundation for an efficient，safe realization of large scale blasting.
    Quality Improvement of Classified Tailing-Cemented Fill Roof
    XU Cong-Wu, XIE Dao-Hui
    2008, 38(11):  33-35. 
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    In light of the problems in classified tailing-cemented filling by pipe gravity-flow, a series of process improvement methods are proposed, including multi-point feeding and vertical bar distribution. The engineering practice shows that the modified process can greatly reduce the segregation and non-uniform distribution of filling material, which can efficiently raise the integral strength of the fill roof, providing a strong technical support for large sectional area mining in high sulfur instable orebody.
    Mathematical Model for Rock Blastability Classification and Its Application
    LI Yong-Qiang, ZHANG Jie, XU Li-Sheng
    2008, 38(11):  36-37+117. 
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    In the long-hole blasting practice in open-pit mines, the judgment of rock blastability is an important basis for choosing the technical parameters of blasting. The accuracy of such judgment finally decides the conformity of the actual blasting effect to the predicted effect. The factors influencing the rock blastability were determined and analyzed and an effective method was established for qualitative description of rock blastability. On this basis, a mathematical model for rock blastability classification was built and applied in Ben Steel's Weitoushan Iron Mine.
    Biological Effect of EPS on Metal Sulfides
    WANG Li, WEN Jian-Kang, LIU Mei-Lin
    2008, 38(11):  38-42. 
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    Based on the study of the role of extracellular polymeric substances（EPS）in biohydrometallurgy carried out both in and outside China, the paper summarizes the composition, structure, biosynthesis and characters of EPS and their biological effect on metal sulfides. EPS dissolves metal sulfides mainly through the oxidation effect of Fe3+ forming complex with the groups such as uronic acid residue group in EPS.
    Practice on the Cationic Inverse Flotation of Roasting-magnetic Separation of Iron Concentrates in Dressing Plant of Jiusteel
    TANG Xiao-Ling, CHEN Yi-Lin, GAO Ze-Bin, CHEN Wen
    2008, 38(11):  43-45+70. 
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    The cationic inverse flotation techniques on the roasting-magnetic separation system is adopted to improve quality and reduce impurities in dressing plant of Jiusteel. The practices show that this technique has such advantages as good efficiency on removing silicon, simple reagents system, never heating, no fouling and smooth production. Compared with the original single magnetic separation technique, this one can improve the grade of concentrates by 4.04%, and reduce SiO2 contents by 4.74%. From separation to iron-making, about 92.25 million yuan at costs can be saved per year.
    Study on the New Beneficiation Process for Improving the Recovery of Certain Refractory Copper Ore
    AI Guang-Hua, ZHOU Yuan, WEI Zong-Wu
    2008, 38(11):  46-48+57. 
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    In light of the characteristics of certain refractory copper ore from Jiangxi, investigation was made on its rational beneficiation process and new reagent regime. The results show that a process consisting of a partial copper preferential flotation and the regrinding and flotation of mixed concentrate can greatly improve the separation indexes of this refractory copper ore, with the copper concentrate grading 21.15% at a recovery of 83.62%. The continuous industrial test of this new process shows a copper grade increase of 1.07%and recovery increase of 18.33% compared with those of the original process
    Catalytic Effect of the Combined Use of Activated Carbon and Silver Ion on the Bioleaching of Low Grade Primary Copper Sulfide Ore
    ZHANG Wei-Min, GU Shi-Fei, YU Rong
    2008, 38(11):  49-51+136. 
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    The catalytic effect of combined use of activated carbon and silver ion on improving the efficiency of the bioleaching of Yongping Copper Mine's low-grade primary copper sulfide ores was investigated through shaking flask experiment. The results show that the addition of both activated carbon and silver ion can further accelerate the dissolution velocity and rate of copper at the initial stage of bioleaching, with a leaching result better than that achieved when only activated carbon or silver ion is added. A combination of 3.0 g/L activated carbon and 2.0mg/L silver ion is most favorable to the copper leaching. In this case, the leaching rate of copper can reach 80% after 310 h bioleaching while it is only 62% and 20% respectively when only 3.0 g/L activated carbon or 2.5 mg/L silver ion is added. It is found that it is more favorable to the bioleaching of copper from low-grade primary copper sulfide ores if the low redox potential is controlled at 600～650 mV.
    Experimental Study on the Flotation Process for an Oxidized Lead-Zinc Ore from Sichuan
    KU Jian-Gang, WANG An-Li, ZHANG Wen-Bin, CAI Sheng-Feng, QIAO Cui-Jie
    2008, 38(11):  52-54. 
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    A low grade Sichuan lead-zince ore is characterized by s high oxidation, fine dissemination size and easy sliming and especially a large amount of hematite and limonite. Its main zinc mineral is smithsonite, which is of low grade and extremely difficult to recover. Such type of ore is often abandoned. Test was made in light of the ore properties, where a principle process of preferential flotation and two staged grinding was adopted. Based on the conventional sulfuration-flotation, a compound collector of L-05 was used for zinc oxide ore. As a result, a lead concentrate with 50.22% lead grade, 76.25% recovery and 1.89% zinc content, and a zinc concentrate with 20.01% grade, 56.14% recovery and 1.52% lead content were obtained, realizing an effective separation of lead from zinc of oxide ore.
    Investigation on the Preparation of Reduced Iron Powder from Iron Ore
    GONG Guo-Hua, HUO Yan, ZHU Ying-Bo
    2008, 38(11):  55-57. 
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    The reduction of solid ferric oxide is a necessary step for producing reduced iron powder. Carbon reduction at solid state of hematite and magnetite by various reducers are investigated. The results show that the reduction temperature and time have remarkable effect on the metallization rate of reduced iron powder. Under the same conditions, hematite is easier to be reduced than magnetite. The research results also indicates that the adoption of a proper reducer can greatly reduce the reduction temperature and also shorten the time of reduction, thus decreasing the production energy consumption and cost and gaining a better economic performance.
    Study on Nontoxic Gold Extraction Control System Based on Fuzzy Neutral Network
    GUO Chun-Yan, SONG Xian-Wen, YU Jun-Qi
    2008, 38(11):  58-62. 
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    In view of the characteristics of nontoxic gold extraction process, a control algorithm of fuzzy neutral network based on genetic algorithm is proposed. The parameters of fuzzy neural network are optimized by integrating offline genetic algorithm global optimization with online BP algorithm local regulation. The improved Elman dynamic recursive network is adopted for the process system identification. The simulation has proven the superiority of this control scheme, which is of important significance to the solution of the control system of industrial nontoxic gold extraction process.
    Application research of Underground Cavity 3D Detection
    LIU Xi-Ling, LI Xi-Bing, LIU Ke-Wei, ZENG Ling-Fang
    2008, 38(11):  63-65+86. 
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    A safe and accurate detection of underground cavity shape, especially for those cavities that people are not allowed to get in for safety reason or those that are inaccessible, is of great importance to the detailed survey and treatment of cavities and to the safe mining. As the conventional detection methods for cavities are limited, cavity laser 3D detection was used for the 3D detection of inaccessible underground cavity from the ground surface. The detection result displayed the shape of the cavity under detection intuitively. Based on the detection data, the basic conditions of each cavity were analyzed and the distribution of the cavities below each mining bench was investigated. The data processed were introduced into SURPAC and CAD present state map of each mining level. The elevations of the floor and bottom at grid intersection points in the cavity plane graph were used to replace the sectional plan needed in blasting design to provide reliable data for bench blasting and cavity treatment. The comparison of the cavity heights practically measured through drilling with those of the corresponding points in the scanning data shows that laser scanning can satisfy the requirement of an accurate 3D detection of cavities.
    Octree Based Method for 3D Mesh Generation of Geological Bodies
    HE Xin, WANG Li-Guan
    2008, 38(11):  66-70. 
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    A method of 3D tetrahedron mesh generation of geological bodies is proposed. Based on octree method, the method adopts tetrahedron as the encasing box instead of conventional cube to generate well-shaped tetrahedron meshes. Then, the boundary of the geological body of the tetrahedron meshes is recovered with the surface model generated by usual mining software. The optimization is required as the meshes at the boundary are often in non-uniform distribution and have non-ideal quality and there are some thin units which should be eliminated so as to form high quality tetrahedron meshes needed for finite element analysis.
    On Digitalized Measuring System for Uranium Mines
    ZHU Yu-Feng, ZHOU Shi-Jian, ZHU Guo-Gen
    2008, 38(11):  71-73. 
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    The paper analyzes the limitations of the existing conventional uranium mine measuring process used in Fuzhou Jin'an Uranium Industry Co., Ltd, CNNC (the former No. 721 Mine of the Ministry of Nuclear Industry), puts forwards the feasibility of using a digitalized measuring system in the production process of uranium mine, and elaborates the overall thought and design concept in developing the digitalized measuring system for uranium mines and its implementation effect.
    3D Complex Geological Bodies Modeling Based on Simple Partitioning
    WANG Yin-Xing
    2008, 38(11):  74-76+147. 
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    To strengthen the spatial analysis and representation capacity of 3D geological bodies model, the paper presents a modeling method based on the simple partitioning theory, discusses the representation of 3D characteristic geological point, line, and polygon based on simple container, and put forwards such algorithms as boundary query, geological area search, geological line tracing, etc. Characterized by simple realization and abundant representation, this model can complete the topological analysis and boundary search that other models cannot do.  As one of the basic and key issues, this new modeling idea will speed the research and application of 3D geological model.
    Designing Software for Grinding Circuits in Mineral Processing
    HU Shen-Chen
    2008, 38(11):  77-80. 
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    CEET, an acronym for Comminution Economic Evaluation Tool, was jointly developed by MinnovEX Technologies Inc. and 13 major mining companies for the purpose of designing and predicting the performance of grinding circuits. It fundamentally differs from other methods by using as its' data set a geostatistically significant population of hardness data distributed across the mine block model. In addition to power selection and shell sizing for multiple circuit options, CEET also outputs tons per hour, P80 and operating cost on every mining block in the mine block model.
    Analysis of the Correlation of the Efficiency of Inclined Narrow Flow  Classifier with the Feed Particle Size and Density
    HAN Xiao-Yi, WANG Wen-Qian
    2008, 38(11):  81-82. 
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    Inclined narrow flow classifier is a new efficient gravity classifying device. To better control the equipment performance, the paper, by combining the theoretical computation and the equipment application practice, analyzes the correlation of the efficiency of inclined narrow flow classifier with the feed particle size and density. The analysis indicates that the best classification efficiency of the equipment occurs when treating high density materials at a classification size of 0.037~0.1mm. In its application in treating feed pulp in Pan Steel's Titanium Concentrator, the classification efficiency is as high as 79.70% at a classification size of 0.063mm and a density of 3.9×10-3 g/mm3.
    Analysis of the Design of Counter-Board Profile of Impact Crusher
    SHI Xiu-Dong, XU Ya-Dong, XU Feng, HUANG Nan-Nan
    2008, 38(11):  83-86. 
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    Solid modeling of impact crusher was made. The crusher working process was emulated by using LS-DYNA, the motion track of materials in the crushing process was computed and the  track curves of materials at different project angles, impact points and particle sizes were analyzed for determining the sectional profile curve of the counter-board. The results provide a basis for the design and improvement of impact crusher structure.
    Research on Metals Recovery from Discarded Printed Circuit Boards by Enhanced Centrifugal Field
    SHI Chang-Sheng, MA Rui-Xin, TANG Li-Gang, WU Fa-Chao
    2008, 38(11):  87-89. 
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    Based on the density difference between the components of discarded printed circuit boards, the paper proposes a new process for recovering these metals by enhanced centrifugal field, describes the efficient centrifugal separation system and analyzes the separation mechanism and enhanced recovery system of Falcon separator. Gravity evaluaton indexes are introduced for evaluating the performance of Falcon separator. When Falcon separator was used to treat-0.5mm discarded printed circuit boards, good results were obtained , including an imperfecton value of 0.01, quantitative efficiency of 93.17% and misplaced material content of 4.5%. This process has successfully solved the problem of recovering metal concentrates from -0.5mm discarded printed circuit boards, providing the theoretical basis and technical support of the industrial application of centrifugal separators.
    Platform Design of the Production Data Dynamic Management System for  Metal Mines Based on .Net Technique and C/B/S Mixed Mode
    ZHOU Zhi-Yong, CHEN Jian-Hong, PAN Wei, LI Ming
    2008, 38(11):  90-92+106. 
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    Based on the discussion of the network system architecture of the MIS system for mining enterprises and the analysis of the basic business operation structural process of mining enterprises, the authors have developed a production data dynamic management system for metal mines that is universal, flexible and ease to maintain by adopting advanced C/B/S mixed mode and ASP.NET technical framework, and also proposed an optimization strategy of the system design. The research indicates that development by C/B/S mixed mode accords well with the business reality of the dynamic management system of the production data of mining-mineral processing enterprises. The system's flexibility and generalization is greatly improved by the development of a maintenance modular of index coding in tree structure. The calculation task for report data is accomplished by a user-defined formula, thus simplifying the program modification and maintenance.
    Research and Realization of the Pinchout Line Auto Creation System  in the Construction of 3D Solid Model
    XU Shuai, SUN Huo-Ran, MU Tai-Sheng, GAO Zhen-Ling
    2008, 38(11):  93-96. 
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    Though the layouts of exploration engineering are variable, there must be a site where an orebody vanishes between the exploration engineering that finds the ore and that which finds no ore. The algorithms of average pinchout angle, finite distance extrapolation and infinite distance are studied and used in constructing orebody pinchout lines. The orebody pinchout auto creation system is realized by using NET language and Object ARX 2007. The system runs stably and is easy to operate. It can produce reasonable and visualized pinchout lines, facilitating the formation of solid model.
    Application of R Language in the Design Test of Silencer
    SHI Fa-恩, REN Ru-Shan, JIANG Da-Hua
    2008, 38(11):  97-99+151. 
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    R language was used in the analysis of the principal elements in the previous test data of the silencer for mine fans and the main factors influencing the effect of the silencer were drawn. Unitary multiple linear regression was made for the relationship between the silencing effect and the main influencing factors. The analysis has helped save a large amount of cost and is of important guidance significance to the next step test.
    Numerical Simulation of 3D Initial Stress Field of Jinchuan No. 2 Mining Area
    WANG Li-Juan, MU Qing-Song, MIAO Tian-De
    2008, 38(11):  100-102. 
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    Jinchuan No. 2 mining area lies in a complex initial stress field, which is composed of gravity field and bidirectional construction stress field. ANSYS software provides a detailed simulation process for its complex initial stress field and a complex 3D simulation method for initial stress field which keeps a stress gradient, thus solving the problem which has puzzled the analyst engineers for a long time. This simulation method is of important reference value to 3D stress field treatment in geotechnical engineering.
    Method of Output Auto Statistics of Truck Dispatch System Based on GPS Data Mining
    ZHENG Xue-Ming, QIAO Yong-Feng
    2008, 38(11):  103-106. 
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    The vast GPS data uploaded from the truck-carried terminals of GPS truck dispatch system are fully considered, analyzed and mined in terms of their influence and function. Based on this, a method of real-time auto statistics of each truck of a GPS system and an automatic identification system for truck states based on road-net are established. The truck output automatically computed according to the truck state can reflect the true conditions accurately and all-roundly, providing enterprise operators with a scientific and efficient way to know the real-time output and a basis for drivers' performance appraisal. The method is detailed through a real case.
    Analysis of the Integral Assessment of Paigeite Ore Process Development and the Key Technical Issues
    QIAN Hong-Wei, XUE Xiang-Xin, AN Jing
    2008, 38(11):  107-109+121. 
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    The important target of an integral assessment of paigeite ore process development is to develop a trade circular economy and make a trade off between the environment development and regional economy involved in the paigeite ore process development. Attempt is made to build an assessment framework for the circular economy of parigetie ore industry, its practical application is envisaged and the key technical issues needing attention are discussed.
    Effect of Modification with KMnO4 on the Cu2+Adsorption of Granular Activated Carbon
    ZHAO Mei-Qing, MA Zi-Chuan, ZHANG Li-Yan, WU Yin-Su, ZHANG Li-Na
    2008, 38(11):  110-113. 
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    Granular activated carbon was modified with KMnO4 at refluxing. The influence of KMnO4 concentration on the Cu2+ adsorption rate-pH curves and pH was investigated and the effect of the modification with KMnO4 on the Cu2+ adsorption and desorption capacities of activated carbon was studied. The results show that the Cu2+ adsorption rate-pH curves and pH of activated carbon move to the lower pH side after modification with KMnO4. The best result is achieved at 0.03mol/L KMnO4 concentration. The modification with KMnO4 has improved the adsorption rate of Cu2+ and reduced the consumption of adsorbent by three times compared with that of unmodified carbon. The Cu2+ adsorption on the modified and unmodified activated carbon conforms to the Freundlich isothermal adsorption equation. At a same equilibrium concentration of Cu2+, the Cu2+ adsorption amount on the activated carbon modified with KMnO4 is about 2.7 times higher than that on unmodified carbon. When 0.35mol/L HCl solution is used as elution solution, the desorption rates of Cu2+ on the KMnO4 modified activated carbon and unmodified activated carbon are 91.1% and 8.8% respectively. The modification with KMnO4 has not only increased the adsorption capacity of granular activated carbon for heavy metal ions, but also improved its desorption-regeneration performance.
    Research on Preparing of Coal-Ash Ceramsite and Its Application in Biological Aerated Filter
    WANG Ping, LI Guo-Chang
    2008, 38(11):  114-117. 
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    Coal ash was used as the main material to produce the ceramsite filter medium of biological aerated filter. It was used as bio-film carrier of biological reactor to treat municipal domestic sewage. During the reactor operation, the average removal rate of COD and nitride ammonium were 85.31% and 66.95% respectively. At a HRT of 1.25h and an air/water ratio of 4.0, the removal rate of COD was the highest, reaching 95.02%; and at a HRT of 1.5h, an air/water ratio of 2.0 and a pH of 8~9, the removal rate of nitride ammonium was the highest, reaching 79.02%. After 12 h backwashing, the removal rates of both COD and nitride ammonium returned to normal.
    Study on the Preparation of TiO2 / Pillared Bentonite Composite Photocatalyst and Its Application
    LIU Yue-E, HOU Jin-Chao, PANG Gui-Lin, ZHEN Wei-Jun, LI Zhi-Juan
    2008, 38(11):  118-121. 
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    With modified Xinjiang Wulanlingge bentonite, titanium tetrachloride and tetrabutyl titanate as the raw materials, TiO2/pillared bentonite composite photocatalyst was prepared by pillaring and multiple loading method. The optimal conditions for the preparation were obtained by adjusting the proportion of TiO2/pillared bentonite，number of loading times and roasting temperature．The TiO2/pillared bentonite composite photocatalyst was characterized by XRD, IR, SEM and EDS. TiO2 was found to be highly dispersed and have penetrated into the lattice layers of bentonite, enlarging the interlayer space and forming non-interfering active reaction centers. The photocatalytic degradation performance of pillared bentonite composite photocatalyst was studied in simulated dyestuff wastewater and the photo degradation test of this photocatalyst was also made in petrochemical oilcontaining effluent.
    Evaluation of Soil Heavy Metal Pollution Based on Extensible Dependency
    AN Yu-Wei, JIANG Yun
    2008, 38(11):  122-125. 
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    The degree of soil heavy metal pollution has uncertainty and its evaluation model is required to reflect this nature. Based on the matter element theory, extension set and dependency function in the extension theory, a model for the dependency and matter elements of soil heavy metal pollution evaluation was established and used in the evaluation of six groups of heavy metal polluted soils. The research shows that extension evaluation decides the degree to which set the pollution belongs to based on their extensible dependency, solving the uncertainty in the degree classification of soil heavy metal pollution. Simple dependency function is used to determine the weight of each influencing factor, which can avoid the subjectivity as it is capable of digging relative information from data characteristics. Therefore, the evaluation method based on the extension theory is an efficient new method for soil heavy metal pollution.
    Application of Environmental Pollution Appraisal Model in Metallic mines
    MO Shi-Xiong, TENG Chong, CHENG Feng, WANG Jie-Guang, WANG Xing-Hua
    2008, 38(11):  126-129+158. 
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    Mining in metal mines will generate noise, toxic gases and heavy metal pollution, producing great impact on and damage to the environment. Only through effective appraisal of these pollutions can optimal measures for their prevention and control be made. In view of this, relevancy is used to determine the relation between pollution impacts and a multi-level comprehensive fuzzy appraisal model, to make an overall evaluation and prediction of the environment influenced by the mining in metal mines and further to determine the impact risk level. The model is applied in studying the environmental pollution of real metal mines, achieving prediction results that are in good accord with the reality.
    Automatic Labeling Model of Ventilation Parameters for Mine Ventilation Network
    GUO Nian-Qin, SHEN Yun, HU Ming-Zhen
    2008, 38(11):  130-132. 
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    This paper studies the method of labeling ventilation parameters in the 3D simulation drawing of ventilation network and the modeling method of different entitative 3D arrows. The automatic labeling of ventilation parameters is realized by VB6.0 in combination with the secondary development technology of SolidWorks, thus enhancing the readability and holistic effect of 3D simulation model for the mine ventilation system.
    Acoustic Emission and Fractal Dimension of Rock under Uniaxial Compression
    JI Ming, GAO Feng, XU Xiao-Li, GU Hong-Xing
    2008, 38(11):  133-136. 
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    The relation among acoustic emission parameters is studied through the analysis of the acoustic data of several rock samples in breakage. It is found that there is an inevitable relation between rock structure and its acoustic emission. The law of acoustic emission activity is analyzed by graphic fitting of various test parameters and the curves of the time-related change of fractal dimension and of the acoustic parameters are compared. The result indicates that there is a correlation between the time-related change trends of fractal dimension and the acoustic emission parameters. Not only can the fractal dimension characterize the frequency of acoustic emission but its least value often predicts a large breakage.
    DEM-based Analysis of the Change of Soil Moisture Content in Mine Surface Layer：With Shendong Mining Area as the Instance
    CHANG Lu-Qun, BIAN Zheng-Fu
    2008, 38(11):  137-140. 
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    MODIS and TM/ETM+ remote-sensing data can be used to make qualitative inversion of the soil moisture content in mine surface layer. Meanwhile, under the support of GIS technology, the soil moisture content in coal mining area before the mining can also be deduced from that of non-coal mining area. Based on the DEM built for Shendong mining area, detailed analysis is made on the law of the change of the soil moisture content with elevation in the area. The result shows that on the scale of unit regional hydrogeology, the soil moisture content has evident negative relevancy with the elevation. On the scale of mining area, there is also a remarkable negative relevancy but a reduced relevancy between them. Moreover, between 1995 and 2005, there was a great difference in the change of the soil moisture contents in high and low elevation regions (900~1 000 m) in the mining area.
    Construction of the Evaluation Index System for Sustainable Development of Lala Copper Mine in Sichuan
    ZHONG Wen-Li, DENG Jiang-Hong
    2008, 38(11):  141-143+155. 
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    To satisfy the need of the sustainable development evaluation of mining area, through the field survey of the production and living conditions of Lala Copper Mine in Sichuan and based on the systematic structure of mineral resource-environment- economy-society, an index system for the sustainable development of Lala Copper mining area which consists of four hierarchies and 29 indicators is built by using hierarchical structure model. Eight individual indicators characteristic of this mining area are selected by contrasting with other domestic and international evaluation index systems for sustainable development, namely,  natural population growth rate, mine area, control rate of water and soil erosion, per capita farmland area, forest coverage，water environment quality，incidence of geological disasters and school-age children enrollment rate. Brief explanation is made of the selection for each individual indicator.
    Multi-Objective Optimization of Water Supply Network for Dust-proofing in Mines
    HOU Xiao-Dong, JIANG Zhong-An
    2008, 38(11):  144-147. 
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    To realize an optimized design of the multi-source water supply network for dust-proofing in mines, the reliability of network was evaluated and defined as surplus node head and network resilience. A multi-objective optimization model for the water supply network was set up based on both economic and reliability analysis and an improved genetic algorithm (IGA) was proposed for solving the model. With the water supply network system of Zhaogezhuang mine in Kailuan Group as the instance, the network optimization was made based on the highest and the average water consumption in multiple working modes, verifying the validity of this method.
    Study on the Beneficiation Processes for Recovering Sheelite and Wolframite from Primary and Secondary Slimes
    DENG Li-Hong, ZHOU Xiao-Tong
    2008, 38(11):  148-151. 
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    Beneficiation processes of  flotation and gravity separation, pre-concentration by gravity separation, flotation and gravity separation and  pre-concentration by gravity separation, flotation, magnetic separation and gravity separation were tested for the primary and secondary tungsten ore slimes containing 0.21%~0.36% WO3 and 77.47% -0.043 mm size fraction. The results show that all these three processes can obtain a sheelite concentrate of flotation containing 46.74%~55.38% WO3 at a recovery of 29.82%~47.14% and a wolframite concentrate of flotation containing 36.62%~38.76%WO3 at a recover of 19.24%~32.51%. The “pre-concentration by gravity separation,, flotation and gravity separation” is more benefit for treating this tungsten slime.
    Explorative Test on the Comprehensive Recovery of Tailings
    WEI Zhen-Ming, ZHANG Xiao-Bao, LAI Chun-Hua, CHOU Ya-Ling
    2008, 38(11):  152-155. 
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    In view of the high content of valuable minerals in the old tailings of a lead-zinc mine, an explorative test was carried out on the re-concentration of old tailings so as to find a rational and feasible beneficiation process and reagent regime. The test achieved good results in the comprehensive recovery of Pb, Zn, Sn, Ag, In, S from the old tailings. The results are of practical guidance significance to the production and management of the concentrator.