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    15 December 2007, Volume 37 Issue 12
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    Progress in Mining Technology for Metal Mines in "Tenth-Five Year Plan" Period and Its Development Orientation in "Eleventh-Five Year Plan" Period
    WANG Yun-Min
    2007, 37(12):  1-9+13. 
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    To promote the progress in metal mine sci-technology and the metal mine sci-technology work in the "Eleventh-Five Year Plan" period, a summary is made of the achievements made in the mining technology of metal mines in China during the "Tenth-Five Year Plan" period, and its development orientation in the "Eleventh-Five Year Plan" period is proposed. It is concluded that the successful development of steep railway hauling technique, new technique of large space concentrated pillarless mining, research on key techniques for mining deep-lying deposits, etc. have greatly propelled the advance in mining technology for metal mines. The analysis indicates that the research on the technology for the transition from open-pit mining to underground mining has lagged behind the demand of production practice, there are a large number of technical problems in deep mining that remain to be solved, the mining for complex deposits is becoming increasingly difficult, domestic mining technology and equipment are still far from those of internationally advanced level and the establishment of digital mine is still at its start stage. In view of this, the development orientation for mining research work in the Eleventh Five Year Plan period is proposed, including research of new type hauling equipment and process for deep open-pit mines, research of open-pit and underground combined mining, research of technology for mining deep-lying orebody and complex deposits, research of digital mine and research of circular economy of metal mines.
    Status Quo of Mining Methods for Gently Inclined Medium-Thick Orebodies and Their Development Trend
    YIN Sheng-Hua, WU Ai-Xiang
    2007, 37(12):  10-13. 
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    The mining of gently inclined medium-thick orebodies is a world-wide technical challenge. The statue quo of the mining of gently inclined medium-thick orebodies in foreign countries is presented. As foreign mines generally have large deposits with high value ores, and possess strong economic power and technical capacity, room- pillar-filling methods are mainly used there. As China has a comparatively weak economic and technical basis,and lacks the fund and technical basis for the equipment introduction and application. Therefore, room-pillar- open stope method is mainly used in mining gently dipping medium-thick orebodies, which is characterized by backward equipment, low input, low efficiency and high dilution and loss. The development trend of the mining method for gently dipping medium-thick Orebodies is forecasted.    
    Progress in Research on Extracellular Polymeric Substance of Thiobacillus Ferrooxidans
    LIU Jian-She, YAN Ying, WANG Hua-Tai, WANG Xiu-Mei
    2007, 37(12):  14-16+52. 
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    The paper describes the progress in the research of the composition and growth-affecting factors of extracellular polymeric substance of thiobacillus ferrooxidans, and its role in the adsorption of thiobacillus ferrooxidans on mineral surface, and makes some suggestions on the relevant future research.
    On Assessment of Core Competence of Resource Type Enterprises
    CHEN Yi, YANG Chang-Ming, WANG Yan-Ping
    2007, 37(12):  17-21+35. 
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    Based on the general analysis and summary of core competence-related theories, the definition for the core competence of resource-type enterprises is proposed; through the analysis of the internal and external environment, resource and capacity of resource type enterprises, a set of assessment indicator system and assessment mode for the core competence of resource-type enterprises are set up; and through the case study of a mining enterprise, the effectiveness of the proposed assessment model is validated and the cultivation mode for the core competence specific to this enterprise is proposed.
    Countermeasures for Development of China's Non-Ferrous Metallic Mines in   Crisis
    ZOU Guo-Liang
    2007, 37(12):  22-23+42. 
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    The paper specifies the definition of in-crisis mines and the classification of the crisis degrees of these mines, and analyzes the present crisis situation of China's non-ferrous metallic mines. Some countermeasures for the development of the non-ferrous metallic mines in crisis are put forward, including enhancing the prospecting of the substituting resources , making great efforts to carry out the strategy of “going out” and doing well the development for production transfer of mines in their last phase and their employees reposition.
    Effect of Mechanical Compaction on Permeability Coefficient of Dump Site Leaching
    WANG Yi-Ming, WU Ai-Xiang, YANG Bao-Hua, CHEN Xue-Song
    2007, 37(12):  24-26+67. 
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    Low permeability coefficient is one of the main problems in dump leaching in China, and fine content and compactness are the important factors influencing the permeability coefficient of a dump site. Laboratory tests were made to study the permeability coefficient of samples at different fine contents and compaction conditions and to study theoretically the compaction and crushing effect of mechanical compaction on the leaching dump. The results show that with the fine content increasing from 10% to 35%, the permeability coefficient of the sample was decreased by one order of magnitude and the sample was turned from a permeable layer into a semi-permeable layer. With the increase of the compactness, the permeability coefficient was rapidly reduced. Under the test conditions, when the compactness is 84.74%, the permeability coefficient of the sample is only 4.49% of that at its natural state. Therefore, the improvement of stacking technology for reducing the mechanical compaction is an effective way to raise the permeability coefficient of the dump leaching pile.
    Key Technical Parameters in by-Layer by-Grade Mining of Sedimentary Bauxite
    ZHANG Ji-Long, JIANG Li-Chun
    2007, 37(12):  27-31. 
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    The technology of by-layer by-grade mining is an effective way to achieve rational exploitation of bauxite in Shanxi Province. The technical connotation of this method is defined and its applicable scope determined. Based on a great deal of field tests, the rational technical parameters of by-layer and by-grade mining for Xiaoyi Aluminum Mine are set: 1) When there is no need of blasting operation, the width of mining strip is 5 m; valid depth of looseness 0.5~0.8 m; space between looseness 1.0~1.5 m; step height of mining 3.5~4.5 m; minimum width of work platform 26~28 m; and the front length generally 60~80 m. 2) In case of a need for blasting, the curve of the relationship between the width of blasting strip and the orebody dip angle (6°~18°) is given as well as the curve of the relationship between the front length and the orebody thickness. The front length will increase with the increase of dip angle, and decreases with the increase of thickness.
    Study on Pushing-Wall Hypothesis of Blasting Mechanism and Pushing-Wall Blasting Technology
    LIU Jing-Guo, DUAN Hai-Feng
    2007, 37(12):  32-35. 
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    The paper presents the pushing-wall hypothesis; analyses three primary premises for two-hole to slip in blasting by this hypothesis, i.e. free face, compensation space and joint pushing effect; with these conditions as standard, makes a comparison among large space millisecond blasting, compression blasting, T type blasting, wave type blasting and large hole-distance blasting; and designs a new blasting mode-pushing-wall blasting. The key technical points of pushing-wall blasting include triangular-hole layout, inter-row igniting and enlarging the toe of the front row to reduce hole space. The pushing-wall hypothesis holds that all pre-splitting blasting, smooth blasting, energy accumulation blasting, large hole-space blasting and pushing-wall blasting originate from the same blasting mechanism and they are all specific applications of the fact that the rock between two holes is easy to slip in the single row simultaneous blasting.
    Calculation of Stope Over-Excavation and Under-Excavation and Safety Analysis for Above-Roof Openings Based on CMS Survey
    LUO Zhou-Quan, LU Hao, LIU Xiao-Ming, YANG Cheng-Xiang, LI Chang
    2007, 37(12):  36-38. 
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    CMS (3D Cavity Monitoring System) is used to make a precise survey of the cavity formed by mining in a metal mine and a 3D model for the cavity that has coordinates fully identical to those of the real mine is established based on the survey data by using SURPAC which is a large deposit modeling software. The cavity survey model established is compounded with the unit model of mining design and the stope over-excavation and under-excavation of the stope are calculated by doing Boolean operations between the models. The cavity model obtained by the real survey is dissected and the obtained sections are then compared to those of the stope construction design for analyzing the safety conditions of the above-roof opening engineering, providing first-hand data for the further improvement of the extraction design and for the safety control of the mine.
    Application of New Mass Caving Technology of Bunch-Hole Equivalent Spherical Charge
    MENG Wen-Quan
    2007, 37(12):  39-42. 
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    The mass caving of bunch-hole equivalent spherical charge is a large-diameter long-hole new VCR technology based on L. Livingston's spherical charge blasting crater theory and the mechanism of a common stress field formation by several densely arraged parallel long holes. It has the optimal conditions for  comprehensively utilizing the explosive energy, which can not only display the advantage of vertical long-hole spepherical charge such as high energy utilization rate of and good rock fragmentation, but can also overcome its disadvantage such as high cost, large development amount and complex ground pressure management of stope. It is safe, economic and efficient, and therefore, is a new technology that has good competitive power in underground large-diameter long-hole mining field. The paper, based on the description of its application in Dongguashan Copper Mine, makes a comprehensive evaluation of the technology and points out its implementation essentials and improvement orientation.
    Research on Negative Pressure Drilling Constructon Technology in Certain Deposit in Xinjiang
    LEI Qi-Feng, HA Jie-Ti, WANG Xi-Wen
    2007, 37(12):  43-48. 
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    The paper describes the operating principles of negative-pressure drilling at high air pressure and its feasibility and implementation results at 200 m depth in certain deposit in Xinjiang. The main technology, procedure, key technical links and matters needing attention of negative pressure drilling are presented. When negative pressure drilling is used in construction, the drill-hole structure can be evidently improved, and the water amount remarkable raised, bringing good results. Therefore, negative pressure drilling technology can be an important means in optimizing in-situ leaching mining.
    Study on Quality Optimization of Bench Blasting in Anjialing Open-Pit Mine
    HUANG Xiao-Ming, ZHANG Rui-Xin, DI Shou-Jun, DING Xin-Qi, SHANG Wen-Kai, CHANG Yong-Gang
    2007, 37(12):  49-52. 
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    To improve the blasting effect and reduce the cost of coal-rock bench blasting in Anjialing Open-Pit Coal Mine, the effect of several factors on the bench blasting results are studied in depth, including the rockmass joint and fissure, hole-spacing parameters, detonation mode and long-hole explosive charging technique. In view of the problems of tight bottom and large fragmentation encountered in the blasting process, technical measures such as changing and regulating the hole-spacing pattern parameters, charging structure, unit consumption of explosive, position of detonation cartridge and millisecond interval are taken to improve the blasting effect of coal-rock bench. The practice shows that these optimized blasting techniques can improve the overall production efficiency of this mine and meanwhile, control in certain degree the mining cost.
    Beneficiation Test Research on Quality Improvement of Certain Magnetic Separation Concentrate from Wugang City
    ZHANG Yong, HU Yi-Ming
    2007, 37(12):  53-56. 
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    The iron concentrate of magnetic separation of a mining company's concentrator in Wugang City, Henan, has a low iron grade of about 63.5% while high silica content of about 10%. In order to improve the product quality, laboratory tests on several beneficiation processes for this magnetic separation concentrate were carried out. Based on this, pilot test using a process of fine screening, regrinding and low intensity magnetic separation of the oversize fraction of screening was made. As a result, an iron concentrate with a yield of 91.94%, iron grade of 68.20%, SiO2 content of 3.44% and iron recovery of 97.81% was obtained, attaining the goal of making the concentrate grade above 68%. The test results can be used as the technical basis for the transformation for optimizing the production process of the concentrator.
    Experimental Research on Beneficiation of Certain Tin-Containing Magnetite Ore
    LI Guang-Tao, ZHANG Zong-Hua, WANG Ya-Jing
    2007, 37(12):  57-60. 
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    A Yunnan tin-containing magnetite ore contains 42.83% iron mainly in magnetite and 0.57% tin mainly in cassiterite. Beneficiation test was made on this ore using a combined process of low intensity magnetic separation and table concentration, and obtained three products: iron concentrate grading 66.01% with an iron recovery of 83.03%; tin concentrate No.1 grading 41.95% with a tin recovery of 17.54%; and tin concentrate No.2. grading 8.28% with a tin recovery of 15.79%, which can be sent to the smelter for recovering Sn by fuming process. The test results have laid a foundation for the exploitation and utilization of this deposit.
    Experimental Study on Copper Separation from Refractory Ore of Lushankeng Open-Pit Mine of Daye Non-Ferrous Metal Co
    LONG Zhong-Sheng, ZHANG Qin, SUN Zhi-Yong, ZHANG Xing-Wang
    2007, 37(12):  61-63+110. 
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    In order to improve the copper beneficiation performance of the refractory ore from Daye Co.'s Tonglushan Open-Pit Mine, detailed laboratory flotation test was made. The results show that mixed collector can be beneficial to the improvement of copper recovery, addition of SB-1 regulator can well solve the interference of mica type gangues to the copper flotation. The application of the collector mixed by isobutyl xanthate and butylammonium aerofloat in 2∶1 ratio and SB-1 in the flowsheet including closed-circuit middling regrinding obtained rather good copper separation indexes. The concentrate has a copper grade of 20.51%, copper recovery of 93.37%, gold grade of 12.48 g/t and gold recovery of 73.60%.
    Research and Practice of Improving Copper Beneficiation Indexes of Lame Zinc Concentrator
    蓝Gui-Mi , FENG Zhong-Wei, NING Fa-Tian, DONG Ming-Chuan
    2007, 37(12):  64-67. 
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    In order to solve the problems of high zinc content and low silver recovery of the copper concentrate produced in Lame Zinc Concentrator, PA was used as the collector, the lime which could strongly depress the silver minerals was eliminated and the agitation in cleaning was intensified to remove PA from surface of mineral such as marmatite, resulting in good beneficiation indexes. The application of a new reagent regime for copper separation in industrial production has led to a reduced copper concentration cost, with a zinc content reduction in copper concentrate from 16.33% to 7.92%, copper recovery increase by 6.01 percentage points and a silver content increase per ton copper concentrate by 1 007 g, which can bring an annual additional economic benefit of more than 10 M yuan to the concentrator.
    Application of Accurate Ball Loading and Addition in Shizishan Copper Mine
    XIAO Qing-Fei, LI Gui-Hai, SHI Gui-Ming, LUO Chun-Mei, DUAN Xi-Xiang
    2007, 37(12):  68-71. 
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    In view of the low production capacity and poor grind fineness of Yunnan Shizishan Copper Concentrator, accurate ball loading and addition method was used to improve the ball loading and addition of the two-stage grinding. The industrial test results indicate that the adoption of the new method can bring a grinding mill production capacity increase by 9％, grinding product fineness improvement by 7.88 percentage points, unit consumption reduction of grinding media by 10.42%, power consumption reduction of the total concentrator by 10.81%, and increase of copper recovery by 2.98 percentage points, a remarkable economic benefit. Accurate ball loading and addition method|Duan's semi-theory formula|Grinding mill capacity|Grind
    Study on Mechanism of Interfacial Emulsification in Solvent Extraction Process
    ZHOU Gui-Ying, RUAN Ren-Man, WEN Jian-Kang, LI Ling
    2007, 37(12):  72-74+85. 
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    To identify the interfacial emulsification mechanism in copper solvent extraction process, the adsorption behavior of bauxite and kaolin solid particles on extractant was studied by establishing the standard curve of relationship between the volume fraction of extractant and the infrared absorption of extractant; and by means of a surface tensiometer, the effect of bauxite and kaolin solid particles on the interface between water phase and extractant organic phase. The results indicate that the adsorption of the solid particles such as bauxite ones on organic solvents can reduce the tension of interface between water phase and extractant organic phase, thus promoting the formation and stability of interfacial emulsions.
    Study on Spatial Distribution of Ore Grade Based on 3D Visualization Modeling Technology
    LI Jia-Quan, DAI Bi-Bo, ZHANG Wei
    2007, 37(12):  75-78+100. 
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    With the rapid development of computer and information technology, many excellent computer-assisted design techniques and methods have gained wide application in mining industry, hereby bringing innovation in production design concept in mining circle and greatly improving the production design and management level of mining enterprises. Guided by this technical development trend and in combination with a real case of a large domestic mine, the paper studies the spatial distribution of ore grade by using geological statistics and three-dimensional visualization modeling technology. The results indicate that the model that is built is reliable, with the results calculated based on it accurate, and can be used to assist geological and mining engineers in resource evaluation, mining design and planning.
    Rock Burst Mechanism Based on Rock Damage and Acoustic Emission Theory
    ZHANG Yan-Bo, KANG Zhi-Qiang, JIANG Guo-Hu, XU Dong-Qiang
    2007, 37(12):  79-82. 
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    Micro-cracks will form and expand in brittle materials such as rocks with the increase of load, which will be accompanied by acoustic emission. Acoustic emission is a good tool for studying the damage evolution in brittle materials, and it can be used to monitor the formation and growth of the microwaves in brittle materials in a continuous and real-time way, which is a predominance that other methods do not possess. Linearity equation of acoustic emission and damage variables were set up by using statistic rules and continuous damage mechanic theory. Biaxial compression experiments were made by marble rocks with various pore rates. Rock burst under bidirectional loads was simulated, acoustic emission characteristic of the damage process studied, and the mechanism of rock burst occurrence was analyzed from the viewpoint of rock damage. The study indicates that rock acoustic emission testing technology, which can be used to trace the formation and development process of rock burst, is a scientific and effective method for studying rock burst mechanism.
    Characteristics of Ore-Controlling Structure of Zhangjiawa Deposit and  Prediction of Favorable Zone for Deposit
    ZHAN Qun
    2007, 37(12):  83-85. 
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    The regional structure controls the orebody formation and basic occurrence law. The characteristics of the ore-controlling structure of deposit are studied and the deposit occurrence law, ore-controlling mode and ore-prospecting indicators are found. Based on this, prediction is made on the mineralization-favorable zone to search for blind orebodies, where ore exploration and tunneling engineering are increased to validate the deposit occurrence law and prediction, so as to increase the mineral reserve and prolong the mine life. It can be of strong guidance significance to the ore-prospecting at the mine depth, contact belt and edge according to the disclosed mineral-controlling mode, deposit occurrence law and ore-prospecting indicators.
    Design and Realization of 3D Visualization System for Mine Excavations
    LI Chun-Min, LI Zhong-Xue, WANG Yun-Hai
    2007, 37(12):  86-89+93. 
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    3D visualization system for mine excavations is an important component of geological and mining engineering visualization system. It is composed of five modules, namely segmentation module, voxelization module, orebody and mine excavation rendering module, 3D display of orebody and mine excavations module, and excavation volume calculation module. The database includes two parts: development system and preparatory working. The system is realized based on VC++ programming language and SQL Server database, and is practically used in an iron mine.
    Study on Data Warehouse in Decision Support System of Ecological Demonstration Zone
    HAN Tian-Fang, WANG Dong-Jun, PEI Ying-Ying, HU Xiao-Min
    2007, 37(12):  90-93. 
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    Ecological demonstration zones are developing rapidly with the development of society, bringing an increasingly larger volume of information. The information treatment is becoming ever more important and complex. Data warehouse technology started only at the end of the eighties in the 20th century and decision support system are dependent on and complementary to each other. Data warehouse technology adopts a totally new data organization mode to carry out various treatments on a large number of raw data and draw the information valuable for making strategic decision. The paper mainly describes the application of data warehouse technology in the decision support system for ecological demonstration zones, highlights the establishment of conceptual model, logical model and physical model, and expatiates the human-machine interface and the future application and maintenance of data warehouse. The paper also describes the design method and procedure of data warehouse system, and the necessity and feasibility of establishing data warehouse technology in the decision support system for ecological demonstration zones．
    Design of ZDY6000L Track-Mounted Hydraulic Tunnel Drilling Rig
    YIN Xin-Sheng, TIAN Hong-Liang, YAO Ke, SUN Bao-Shan, WU Di, FAN Dong
    2007, 37(12):  94-96+100. 
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    With the development of coal mining technology, the contradiction between drilling and excavation has become increasingly prominent. The existing split-type hydraulic drills, though able to meet the requirement of drilling engineering, have the disadvantages of poor mobility, long auxiliary time and strong labor strength, and therefore, can not well satisfy the high efficiency high production requirements. It is very necessary to develop track-mounted self-propelled drills with improved mobility and reduced labor strength requirement. The paper describes in detail the development of ZDY6000L track-mounted tunnel drilling rig, including its integral layout design, design idea of its chassis and main parts, and design of its hydraulic system. The industrial test and application of the drilling rig are also presented. The testing results indicate that all of its technical performances have reached the designed indexes.
    Application of DC Speed Regulator in Power Braking of Mine Hoist
    LUO Jin-Sheng, CHEN Bao-Min
    2007, 37(12):  97-100. 
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    Based on the transformation of AC hoist TKD-A electric control system, the paper presents the control mechanism of realizing the power braking of wound type asynchronous motor by using the combination of all digital speed regulator and S7-300 PLC, and the setup of the key parameters of 6RA70 and PLC software process. This method has the advantages of stable and reliable operation and convenient parameter configuration, being of reference value to the transformation design of TKD-A system of mine hoister.
    Characteristics Analysis of Forces on Dispersal Particles in Swirling Flow Field
    LI Xue-Bin, YUAN Hui-Xin, CAO Zhong-Wen
    2007, 37(12):  101-103+134. 
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    The forces acting on the dispersal particles in a swirling flow field are analyzed in an all-round way by applying the theory of two-phase flow dynamics, and the relevant forces are classified into definitive forces and stochastic forces. On this basis, a differential equation of the stochastic motion of dispersal particles is established, laying a foundation for the further study of the motion behavior of dispersal particles in a swirling flow field.
    Research on Press Filtration Performance of Ekou Iron Concentrator
    WANG Hui-Feng, HE Jun-Lu, ZHU Ke-Song
    2007, 37(12):  104-106+114. 
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    In view of too high moisture of iron concentrate cake of disk vacuum filter press in Ekou Iron Concentrator, Tai Steel Group, laboratory press filtration test was made using KM9/1000 rapid filter press. The results showed that the cake moisture was reduced to below 8% at a filter chamber depth of 40 mm, feeding pressure of 0.8 MPa， simultaneous cake pressing and blowing at 0.5 MPa under diagram press filtration mode The site test on the same press filtration scheme was carried out in Eokou Iron Concentrator, an average cake moisture of 7.3% was obtained at a unit throughput of 408 kg/(m2·h), validating the feasibility of using KM rapid filter press to treat Ekou iron concentrate.
    Realization of 3D Interactive Simulation Control of Mechanical Products
    ZHOU Yuan, WANG Kun
    2007, 37(12):  107-110. 
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    Taking table as example, the paper describes how to use AutoCAD & 3Ds MAX and Cult 3D to realize 3D modeling and interactive simulation control of mechanical products
    Study on Time Series Fractal Characteristics of Mine Accidents
    GUO Jin-Ping, WU Ling, GU Qing-Hua, LU Cai-Wu
    2007, 37(12):  111-114. 
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    Mining belongs to high-risk industries. Its accident causes and evolution mechanism are very complex and the fractal theory has made it possible to solve these complex problems. It is found through the study on the time series of the mine accidents in China in recent years that the mine accident time series has evident fractal characteristics, and its steady correlative dimension is 6.390, indicating that at least 6 state variables are needed in describing the change characteristics of mine accidents and in constructing a dynamic system. The Kolmogorov entropy of the mine accident time series is approximately 0.058 6，indicating  that the mine accident dynamic system is chaotic and its average forecastable time scale is about 17 months. The study results can be used as the basis for constructing the forecast model of mine accidents time series. Mine accidents|Time series|Fractal dimension|Reconstruction of phase space|Kolmogorov entropy
    Study on Reliability Analysis of Anchor Cable Anti-Slide Pile Structural System
    YANG Yi-Xing, YU Ke-Lin
    2007, 37(12):  115-118. 
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    Pre-stressed anchor cable anti-slide piles have been widely applied in regulating landslide engineering. However, its design and calculation theory far lag behind its engineering application. The uncertainty of rockmass material and the complexity of interaction between rockmass and structural system are not fully considered in engineering design. For this, reliability theory is used in the design calculation of anchor cable anti-slide pile and its reliability calculation model is built according to its failure form. A reliability calculation method for the structural system of anchor cable anti-slide pile by using both Monte Carlo method and PNET method is proposed, which not only makes full use of the high calculation accuracy of Monte Carlo method, but also takes into consideration of the correlation among various failure modes. Therefore, it is obviously more advantageous than single method. Practical engineering case has proven its feasibility and rationality, and therefore, it is of very important engineering significance.
    Experimental Research on Adsorption of Cr(Ⅲ) from Water by Mn3O4
    MA Zi-Chuan, LI Yan, YU Hua-Jiang, WU Yin-Su
    2007, 37(12):  119-121. 
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    With synthesized Mn3O4 as adsorbent, the adsorption of Cr(Ⅲ) was investigated as a function of pH, adsorption time, adsorbent dosage and concentration of Cr(Ⅲ), and the adsorption isotherm was also determined. The results indicate that when the initial Cr(Ⅲ)concentration is 10 mg/L, adsorption occurs in the pH scope of 3.0~7.2; when pH=6.5, the adsorption rate can reach 93.7%; if pH＞7.2, Cr(OH)3 precipitation is apt to occur; at a temperature of 25 ℃ and pH of 5.5, the adsorption of Cr(Ⅲ) onto Mn3O4 experiences a process of rapid rise, gradual increase and slowing down, needing 17 hours to finally reach the final equilibrium. The amount of Cr(Ⅲ) adsorbed increases with the increase in Mn3O4 addition and Cr(Ⅲ)concentration, and the adsorption isothermal accords with Freundlich equation.
    Eco-art Park——Study on A New Mode of Restoration of Abandoned Mining Zones in China
    ZHANG He-Yu, ZHAO Yan-Ling, WANG Yu-Qin, XIAO Wu
    2007, 37(12):  122-125. 
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    The paper briefly reviews the history of restoration of abandoned mining zones in China and in foreign countries. By borrowing the experiences from excellent cases of art parks and scenic parks in developed countries, a tentative plan is proposed to build eco-art parks on feasible abandoned mining zones in China, which can include themes of “land art + tour in industrial and mining area + scenic park + art park”. A case study is made on an abandoned mining zone in west Beijing to demonstrate visually the concept of building an eco-art park. The eco-art park mode aims to renovate the function and application of the industry establishments in the abandoned mining zones through ecological design and vision design, hereby helping mining cities gradually realize a favorable economic, social and cultural cycle in the economic type transfer process.
    Heavy Metal Concentration and Plantability Assessment of Edible  Vegetables in Lechang Lead-Zinc Mine Area
    YANG Qing-Wei, SHU Wen-Sheng, 蓝Chong-Yu
    2007, 37(12):  126-127. 
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    In order to know the heavy metal concentration in the vegetables in heavy metal mine area, and to assess the plantability of various kinds of edible vegetables, sampling was made of eleven edible vegetables and the relevant soils in Lechang lead-zinc mine area in Guangdong. Their concentrations of heavy metals such as Pb, Zn, Cu and Cd were analyzed with atomic absorption spectrophotometer, and the eleven edible vegetables were clustered by clustering analysis method. The results indicate that both Pb and Cd concentrations in all these vegetables exceed those specified in the related national standard while Cu and Zn concentrations are basically within the standard limits. Potato, pea and broccoli can be continuously planted locally, and however, care should be taken in taking their edible parts.
    Test on Recovery of Titanium for Tailings of High Intensity Magnetic Separation of Heishan Titanium Concentrator
    DAI Xin-Yu, YU De-Wen
    2007, 37(12):  128-130. 
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    There is still some ilmenite in the tailing of the secondary high intensity magnetic separation in Heshan Titanium Concentrator, Cheng Steel. To reduce the resource waste, test is made on the titanium recovery from this tailing. The results show that a rough concentrate with a TiO2 grade of 32.12% and TiO2 recovery of 38.02% can be obtained by adopting a single gravity separation process consisting of roughing by spiral sluice and cleaning by tabling, which can be sold as blast furnace burden. The combined flowsheet consisting of roughing by spiral sluice, cleaning by tabling, sulphur flotation and titanium flotation can obtain a qualified titanium concentrate with a TiO2 grade of 47% and meantime a sulphur concentrate as a byproduct that has S grade of above 39%.
    Preparation of Iron Concentrate from Residue of Neutral Leaching of Zinc Calcine
    XIAO Chun, TANG Mo-Tang, HE Jing, LU Jun-Le
    2007, 37(12):  131-134. 
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    To comprehensively utilize the iron in the slag of wet zinc smelting, test is made on the preparation of iron concentrate from the residue of neutral leaching of zinc calcine. Based on the conventional wet zinc smelting process, the high acid leaching is transformed into high temperature high acid reduction leaching process, making it possible for the iron to enter the solution in the form of ferrous iron, which is then precipitated by hydrogen peroxide and basic zinc carbonate. The test results indicate that the new process can obtain an iron concentrate grading over 51% from the leaching residue of zinc calcine, greatly reducing the final residue amount and meanwhile having no impact on the recovery of both zinc and indium.