Loading...
Welcome to Metal Mine! Today is Share:
×

扫码分享

Table of Content

    15 September 2008, Volume 38 Issue 9
    Previous Issue    Next Issue
    Review of the Flotation Technology Development of Anshan Steel's Mines
    SONG Ren-Feng, LI Wei-Bing
    2008, 38(9):  1-6+18. 
    Asbtract ( 1476 )  
    Related Articles | Metrics
    The paper describes the research and industrial application of the techniques of direct flotation in acidic medium, direct flotation in basic medium, cationic indirect flotation and anionic indirect flotation for the iron ore in Anshan Steel, analyzes the advantages and disadvantages of the application of the above techniques, and makes suggestions on enhancing the development of the flotation technology in Anshan Steel' mines.
    Analysis of the Current Situation of Iron Ore Import and Its Strategy
    YE Hui, SUN Xi-Li
    2008, 38(9):  7-10+154. 
    Asbtract ( 1655 )  
    Related Articles | Metrics
    Iron ore is the basic and most needed raw material for iron-making. Though the world reserve is abundant, the limited output and low grade of China's iron ore can not meet the development of its iron and steel industry. The iron ore imported has become one of the China's important industrial raw materials of resource type. The iron ore import trade involves a large volume and high amount. The great fluctuation of the international price of iron ore has produced great impact on China's economic growth. To ensure a safe iron ore supply and promote a well and rapid growth of China's industrial economy, we must adapt ourselves to the supply-demand pattern of world iron market, follow the basic law of mineral exploration and exploitation, strengthen the study on the strategy of utilizing the foreign iron ore resource and improve the level of scientific utilization of resource. Based on a deep analysis of world iron ore resource, the iron ore resource exploitation and utilization in China and its iron ore import situation, the authors put forward the basic strategy for utilizing foreign iron ore resource.
    Study on Mine HR Management Method
    WEI Shu-Xiang, HOU Yun-Bing, WEI Jian-Xian, YAO Xiang-Ke, ZHANG Yong-Hui, XUE Li-Ming
    2008, 38(9):  11-14. 
    Asbtract ( 1903 )  
    Related Articles | Metrics
    Beiminghe Iron Mine human resource management system and method are established in accordance with the requirements for modern mining enterprise management. The working posts, job responsibilities and working instructions are designed according to the new management concept. The system includes subsystems of open and fair competition for working posts, improved pay management, performance assessment, and quantified assessment indexes. Beiminghe Iron Mine's HR management method has achieved good performance in its practice and help improved the enterprise's standardized and precise management level.
    Stability Analysis of Jointed Rock Slope by Discrete Element Method
    LIU Hong-Yan, WANG Ming
    2008, 38(9):  15-18. 
    Asbtract ( 1760 )  
    Related Articles | Metrics
    The existence of a large number of joints in rockmass can lead to mechanical properties that are obviously different than those of an integral rockmass，greatly increasing the complexity of its mechanical calculation. Based on the discussion on the calculation principle of two-dimensional discrete element method，the corresponding program is adopted to calculate the stability of the rocky slope under natural and seismic conditions respectively and a detailed analysis is made of the calculation principle for the seismic condition. The safety coefficients under the two conditions are calculated to be 2.0 and 1.67 respectively，illustrating that the slope is stable. Meanwhile，it is shown that two-dimensional element method is very suitable for the stability calculation of jointed rocky slope.
    Optimization Technology of Deep Water Borehole Blasting
    WANG De-Sheng, GONG Min, LI Jing-Shun, ZHOU Qing-Zhong, ZHANG Guang-Zhou
    2008, 38(9):  19-22. 
    Asbtract ( 1935 )  
    Related Articles | Metrics
    With the yearly increase of the depth of open-pit mining, the water infiltration of borehole can not be ignored. The paper analyzes the effect of the water in boreholes on blasting effect and discusses its technical route. In light of the reality of Shougang Iron Mine and by making use of the incompressibility and good energy transmission of water medium, large space borehole pattern and comprehensive blasting optimizing technology were adopted. As a result, the blasting output per meter hole was raised and the blasting effect removed, achieving significant achievement in exploring efficient blasting of deep-water borehole.
    Study on the Rockbust Mechanism and Characteristics in a Deep Mine
    JI Xue-Wen, WANG Chun-Lai, WU Ai-Xiang, YAN Qing-Wen, HUANG Xue-Gui
    2008, 38(9):  23-25+30. 
    Asbtract ( 1851 )  
    Related Articles | Metrics
    Huize Lead & Zinc Mine of Yunnan Chihong Zn & Ge Co., Ltd is a one thousand meter-deep mine. The main problems in the mining of this hard-rock deposit include high ground stress and developed fault structure. The paper describes the mine geological conditions and the rock core caking and wall rock spalling observed in the field investigation, analyzes the rockburst characteristics, summarizes the basic law of rockburst occurrence and classifies the rockburst type and intensity of No. 8 orebody. It is concluded that the wall rock of this orebody between 1 451 m level to 1 261 m level has medium to strong trend of rockburst. The causes and mechanism of rockburst are analyzed from the initial rock stress, geological structure and mining depth, hereby providing an important basis for choosing the rational mining method and the technical measures for controlling the rockburst.
    Caustic Slag Cement and Its Fixation Effect for Lead-Zinc Tailings
    ZHANG Zhi-Qiang, PAN Zhi-Hua, YAN Xiao-Mei, YANG Nan-Ru, WANG Fang-Han, CAO Wei-Qin
    2008, 38(9):  26-30. 
    Asbtract ( 1760 )  
    Related Articles | Metrics
    Through the tests on the strength of pure cement, the fluidity of cement-tailing slurry and its solidified body, the suitable proportioning ratio of the caustic slag cement and its addition for tailing solidification were determined. The adoption of caustic slag cement prepared by low modulus sodium silicate (14%) and slag powder could obtain good compressive strength of the hardened body of the pure slag cement, which was as high as 69.6 MPa after three days and 84.0 MPa after seven days and 91.8 MPa after 28 days. When the slurry had the same amount of caustic slag cement and tailings, its fluidity was evidently better than that of the slurry consisting of silicate cement and tailings and the strength of its solidified body was also higher than that of the latter, especially after a longer time of solidification. When the fluidity of both slurries was controlled to be the same, the solid content of the former could be higher than that of the later. The investigation of the internal microscopic structure of the cement and tailing solidified body by SEM indicated an evident cementing character in that of the caustic cement and tailings. MIP measurement of the internal pore structure of the solidified body shows that the total pore rate of the solidified body was reduced when the dosage of the caustic slag cement was increased, with the large pore proportion reduced and the small pore proportion increased. It can be considered, through the comprehensive investigation of the fluidity and the strength of the solidified body of cement and tailing slurry, that caustic slag cement is more suitable than common silicate cement to be used as the cementing material for tailings.
    Technology of Filling Extra-Large Mined-out Spacies
    WANG Fa-Zhi
    2008, 38(9):  31-34. 
    Asbtract ( 1484 )  
    Related Articles | Metrics
    Two extra-large mined-out spacies formed by the mining at the shallow east and west Shizishan mine sections of Dongguashan Copper Mine remained untreated for a long time, causing certain impact on the normal mining production and the surrounding environment. The deep mining of Donggushan Copper Mine started in 2006 and the mining and mineral processing capacity is 13 000 t/d. The tailing sands produced by the concentrator are normally used to fill the deep mined-out area and there are still slightly surplus tailings. To solve the issue of the surplus tailing discharge, this part of tailings is used in treating the above-said extra-large mined-out spacies. In the process, several issues have been solved such as enclosing wall design, water drainage, tailings transport and filling control. As a result, the hidden safety dangers due to the existence of these extra-large mined-out spacies have been removed.
    Design of Mine Road Pavements Based on CBR Method
    JIA Zhi-Rong
    2008, 38(9):  35-37. 
    Asbtract ( 1643 )  
    Related Articles | Metrics
    CBR is a mature，fast design method for heavy traffic roads. As it needs few basic parameters and involves a simple design process，the method is still used in many countries. The current Chinese design rule for factory and mine roads can not result in an effective design for heavy traffic and the specified design method is difficult to be mastered by mine technicians. Therefore，it is suggested to apply CBR method in the mine road design. The pavement thickness is determined by the designed wheel load and the CBR value of subgrade. The calculation formulae for pavement thickness and traffic load，the procedure of pavement design and also the commonly used parameters for pavement design are given.
    Application of Neural Network in Analyzing Open-pit Slope Stability
    LIU Li-Feng, ZHU Ming, YUE Xin, ZHU Kai-Yu, PENG Ji-Huan
    2008, 38(9):  38-39+56. 
    Asbtract ( 1455 )  
    Related Articles | Metrics
    The factors influencing the stability of open-pit slope are very complex and the precise effects of some factors on the slope are very hard to determine. The application of neural network in analyzing the open-pit slope stability has gradually aroused the attention. The paper studies the rockmass' influence of the dip of structural plane，the length of intermediate structural plane，cohesive force，frictional angle，gravimetric density and water pressure on the open-pit slope stability and illustrates，through the analysis and comparison of 49 instances，the feasibility of applying BP neural network in the analysis of open-pit slope stability.
    Study on the Method for Reducing Blasting Fragmentation
    NIU Ai-Hong
    2008, 38(9):  40-42. 
    Asbtract ( 1557 )  
    Related Articles | Metrics
    To reduce the blasting fragmentation as much as possible in the production organization of a mining-mineral processing complex is the basis for realizing its rational economic objective. Therefore, study was made through fishbone diagram, failure mode analysis, complete factor analysis, rapid improvement of selected factors, correlation and significance analysis by test design and optimization of key factors by tuning diagram. As a result, the correlation among three parameters influencing blasting fragmentation was found and an effective technical method for reducing the blasting fragmentation was summed up, which is of very important significance to guiding the practical production and has achieved significant economic benefits in practice.
    Bioleaching of Chalcopyrite at Low Redox Potential
    SHU Rong-Bo, WEN Jian-Kang, RUAN Ren-Man, ZHANG Yue-Hong
    2008, 38(9):  43-45+77. 
    Asbtract ( 2014 )  
    Related Articles | Metrics
    In acidic medium, the presence of high concentration Fe2+ ions will facilitate the oxidative leaching of chalcopyrite. A single sulfur-oxidative bacteria was separated and adapted for highly efficient ore leaching and used in the investigation of bioleaching of chalcopyrite at low redox potential by making use of its high oxidation ability for free sulfur and Fe2+ iron' role of promoting the oxidative leaching. It is found that sulfur-oxidative bacterial can effectively make use of the product of oxidative dissolution of chalcopyrite-free sulfur to implement the H+ consumption in the solution by oxidizing it into sulfuric acid. Meanwhile, the removal of the free sulfur from the chalcopyrite will facilitate the ion diffusion and the further oxidative solution of chalcopyrite.
    Research on the Middling in Reverse Flotation of Magnetite by Flotation Column
    LI Lin, LIU Jiong-Tian, YOU Xiao-Fang
    2008, 38(9):  46-47+151. 
    Asbtract ( 1616 )  
    Related Articles | Metrics
    The industrial application of cyclonic static micro-bubble flotation column in the cationic reverse flotation of magnetite ore is its first successful case for the reverse flotation of iron ore. To better use this new type equipment, the middling issue in its industrial application is pointed out and a middling treatment mode different from conventional flotation process is proposed based on experimental research. The solution for series problems including middling has perfected the magnetite cationic reverse flotation process by flotation column, opening a wider prospect for the application of this process.
    Test Research on Beneficiation of a High Sulfur Magnetite Ore from Qinghai
    ZHANG Ling-Yan, ZHOU Shao-Jun, TANG Hua-Wei, LAI Wei-Qiang, BU Jun-Fen, LU Yi
    2008, 38(9):  48-50+64. 
    Asbtract ( 1484 )  
    Related Articles | Metrics
    A Qinghai magnetite ore contains non-ferrous metals such as zinc and copper that have fine dissemination grain sizes. A process consisting of flotation and magnetic separation was used for processing this high sulfur magnetite ore. At a grinding size of 90.07% - 0.074 mm，an iron concentrate containing 68.76% TFe  and 1.08%  sulfur at an iron recovery of 80.22％ was obtained. Meanwhile，a sulfur concentrate grading 26.09% at a sulfur recovery of 65.51% was also gained，in which some metal elements such as copper and zinc were enriched. This iron concentrate was then processed by oxidized roasting to reduce its sulfur content to below 0.2%，reaching the quality standard for fine quality iron concentrate.
    Tests on Flotation of Oxidized Lead Ore from Lanping，Yunnan with Enhanced Dispersion
    CHEN Jian-Hua, LONG Qiu-Rong, JIN Rui, WANG Jing-Shuang
    2008, 38(9):  51-53+83. 
    Asbtract ( 1536 )  
    Related Articles | Metrics
    In light of the fine dissemination size and high slime content of the oxidized lead ore from Lanping，Yunan，a large amount of sodium hexamethahposphate was used as the slime dispersing agent to eliminate the effect of the slime. The test results show that without desliming，a lead concentrate grading 64.53% at a lead flotation recovery of 89.06% can be obtained by a process consisting of one roughing，one cleaning and one scavenging.
    Study on the Optimum Technological Conditions of Preparing Silica White from Laterite Nickel Ore
    LIU Yan, ZHANG Xia, LI Zai-Yuan, DI Yu-Chun, SHEN Xiao-Yi
    2008, 38(9):  54-56. 
    Asbtract ( 2221 )  
    Related Articles | Metrics
    Silica white was prepared from laterite nickel ore by the method of molten NaOH-carbonization decomposition. The optimum technological conditions were found through alkali melting reaction orthogonal experiment L9(34) to be: a mass ratio of alkali vs. ore 150/50, reaction temperature of 823 K, reaction time of 3.5 h and material particle size of 1.704μm. The extraction ratio of SiO2 in enlarged experiment reached 79.10%. The silica white product obtained by the carbonation decomposition of leached solution conforms to the state standard of HG/T3065-1999. The solution obtained by carbonation decomposition was causticized to recycle the alkali and carbon dioxide.
    Industrial Tests on Improving High Intensity Magnetic Separation Capacity of Donganshan Sintering Plant
    SONG Bao-Ying, LUAN Ling, YUAN Li-Bin, YANG Hui-Li
    2008, 38(9):  57-62+72. 
    Asbtract ( 1702 )  
    Related Articles | Metrics
    The existing problems of the technical process of No.1 Concentration Workshop of Donganshan Sintering Plant were analyzed and the industrial tests on the capacity of high intensity magnetic separation for general ores and common hematite ores described . Based on the analysis of the industrial test results，tests on the closed circuit flotation were carried out and suggestions on increasing the high intensity magnetic separation capacity of Donganshan Sintering Plant were made.
    Grinding Process for Fibrous Palygorskite
    ZHANG Jie, LIAN Qiang, HE Lin
    2008, 38(9):  63-64. 
    Asbtract ( 1989 )  
    Related Articles | Metrics
    Palygorskite is a kind of hydrous magnesium silicate mineral of layered chain structure and belongs to the rare mineral resources in the world. Its industrial development and application is greatly restricted by its hard grindabilty.  In present work，a dry fine grinding process for fibrous palygorskite from Dafang, Guizhou is studied by laboratory test, and the results show that the experiment-established grinding technological process is feasible for fibrous palygorskite.
    Depressor for Cu-S Separation in Low Alkaline Medium and Its Depressing Mechanism
    YU Xin-Yang, ZHOU Yuan, ZHONG Hong
    2008, 38(9):  65-67. 
    Asbtract ( 1627 )  
    Related Articles | Metrics
    Cu-S separation test was conducted at pH=7~8 with Ca(ClO)2 as the depressor for pyrite, and the depressing mechanism of Ca(ClO)2 for pyrite was studied. The test shows that Ca(ClO)2 is a good depressor for pyrite and good Cu-S separation can be achieved at a low alkalinity of pH=7~8 with only a small amount of Ca(ClO)2 but without lime. The analysis of Raman spectrograms before and after the addition of Ca(ClO)2 indicates that at a pH of 7~8, Ca(ClO)2 will oxidize the pyrite surface to produce a hygrophilous film of Fe(OH)3 and CaCO3 on it, which can enhance the hydrophilicity of pyrite surface, making it fully depressed so as to achieve a separation of copper from sulfur.
    Research on the Flotation of an Arsenic-Containing Gold Ore
    YUAN Lai-Min, HU Zhi-Gang
    2008, 38(9):  68-69+139. 
    Asbtract ( 1732 )  
    Related Articles | Metrics
    Gold recovery from arsenic-containing gold ore has been a major subject of flotation research. In this research, lime, sodium bisulfite and small amount of cyanide as the depressors for arsenopyrite and a suitable process were adopted to realize an effective separation of gold from arsenopyrite, with the gold concentrate containing 0.27% arsenic at an arsenic removal rate of 92.68% and the gold concentrate grading 82.30 g/t at a gold recovery of 87.01%.
    Experimental Study on the Beneficiation of Refractory Molybdenum Ore
    GONG En-Min, CHEN Jiang-An, LUO Xian-Ping
    2008, 38(9):  70-72. 
    Asbtract ( 1680 )  
    Related Articles | Metrics
    Investigation was made on the mineral composition of a molybdenum ore. In consideration of its high pyrite content, unevenly dissemination of molybdenite and difficult liberation, a preferential flotation and a reasonable reagent system were adopted, resulting in an efficient recovery of the molybdenite and pyrite.
    Study on Preparing Nanosized ITO Powder by Chemical Liquid Phase Coprecipitation Process
    LI Xuan-Hai, WEI Kun, LIANG Xin-Yuan
    2008, 38(9):  73-77. 
    Asbtract ( 1658 )  
    Related Articles | Metrics
    Indium tin oxide (ITO) nanopowder was synthesized by liquid chemical co-precipitation process using 4 N indium and tin ingots as material and ammonia (25% wt) as precipitator. The study investigated the effect of the initial concentration of indium ion，reaction temperature, pH of reaction end and aging time of precursor on the size of ITO powder. The powder was characterized by means of X-ray diffraction (XRD), differential thermal analysis, thermogravimetric analysis (DTA-TG), transmission electron microscopy (TEM) and field-emission scanning electron microscope(SEM). At 1% sodium silicate, a reaction temperature of 60 ℃, a final reaction pH of 8, an aging time of 2 h and a calcination temperature of 800 ℃ for 4 h, the ITO powder particulates obtained are of cubic crystalline structure, 20～40 nm sized, spherical, uniform and well dispersed. Compared with the previous ones, this process has the advantages of easy-to-get raw material, improved co-precipitation, moderate reaction, simple process equipment, small pollution, low cost and high quality, providing a new process route for the synthesis of nanosized ITO powder.
    Preparation of Nano Sized Calcium Carbonates of Various Shapes by Tubular Reactor
    YANG Xiao-Hui, ZHANG Xing-Chen, CI Li-Jie, CHANG Yong-Fang
    2008, 38(9):  78-81. 
    Asbtract ( 1419 )  
    Related Articles | Metrics
    Nano sized calcium carbonates of various shapes were prepared by tubular reactor and with limestone from different places of origin as the raw material and sodium sulfate as the crystal shape controller. The grains of Nano sized calcium carbonates are characterized by SEM and XRD. The research indicates that this process for producing nano sized calcium carbonates is characterized by low energy consumption，narrow size distribution and shape & grain size selectivity through choosing materials from proper places of origin，adding grain shape controller and changing the flow rate of carbon dioxide. Therefore，this process has strong market potential.
    Determination of the Arsenic Content in Iron Ores by HG-AAS and AFS Methods and Result Comparison
    FU Ran-Ran, BAO Hui-Jun, ZHANG Ai-Zhen
    2008, 38(9):  82-83. 
    Asbtract ( 1595 )  
    Related Articles | Metrics
    The determination limit and precision in determining the arsenic content in iron ores by HG-AAS and AFS methods were calculated. The arsenic content in three iron ores (CRMS) were determined using HG-AAS and AFS respectively. It is concluded through comparison that the results by both methods are all near to the standard value, satisfying the requirement.
    Research and Progress in the Stability Monitoring Methods of Mine Grouting Curtain for Water Blockage
    ZHANG Sheng-Jun, TANG Chun-An, WANG Zai-Quan
    2008, 38(9):  84-86+162. 
    Asbtract ( 1520 )  
    Related Articles | Metrics
    The paper analyzes the current research on the stability monitoring methods of mine grouting curtain for water blockage, describes briefly the mechanism and characteristics of the digitalized microseismic monitoring method for the stability of grouting curtain for water blockage and the construction and application of such a digitalized microseismic monitoring system in Zhangmatun Iron Mine, and prospects the future application of microseismic monitoring in preventing dynamic disasters such as mine water inrush.
    Research and Application of 3D Tetrahedral Network Model in Solid Mineral Reserve Estimation
    GONG Jun-Fang, WU Xin-Cai, LIU Xiu-Guo, LI Sheng-Wen
    2008, 38(9):  87-89+103. 
    Asbtract ( 1592 )  
    Related Articles | Metrics
    Mineral reserve estimation of orebody involves a large amount of data, and the conventional manual computation can be a heavy and fussy work. Computing the reserve based on 3D orebody modeling can effectively improve the efficiency of mineral reserve estimation and management. Tetrahedral network model is chosen for orebody modeling after an analysis of currently commonly used 3D orebody modeling methods and an orebody reserve computing method based on a constrained tetrahedral network, proposed. The method has the main advantages of being capable of a unified management of the orebody boundary and the internal grade distribution through the tetrahedral network model and of high computing accuracy. Therefore, it is of certain significance to both theoretical research and practical application.
    Section-Based 3D Visualization Modeling of Stratified and Non-Stratified Orebodies
    ZHAO Pan, TIAN Yi-Ping
    2008, 38(9):  90-92+96. 
    Asbtract ( 1662 )  
    Related Articles | Metrics
    Reconstruction of 3D sections by 2D contour lines is an important technical means in geometric modeling of orebodies. The paper discusses the possible problems（contour correspondence and contour connection）in several kinds of reconstructions and puts forward the algorithm of contour reconstruction that is suitable for modeling of geological body section，section-based 3D geological modeling process，line frame plane model of geological body and corresponding geological block model.
    Factor Analysis of Trace Elements of Chengchao Iron Ore
    MIN Hou-Lu, XU Bo-Jun, JI Ao, YANG Zhen, WANG Lei, XIA Jin-Long
    2008, 38(9):  93-96. 
    Asbtract ( 1675 )  
    Related Articles | Metrics
    The results of the factor analysis of trace elements in the iron ore of Chengchao Iron Mine in the southeast of Hubei indicates that the ore formation of Chengchao iron deposit experienced the sodium and potassium mineralization in magmatite evolution period, during which, iron and copper were preliminarily enriched as ore-forming substances and entered the magmatic hydrothermal fluid accompanying the magmatic liquidation. In the ore-containing hydrothermal fluid evolution period, it also experienced early skarn stage, oxide mineralization stage and sulfide mineralization stage, and then at the late hydrothermal fluid period, the carbonization stage and the end the mineralization, forming a complete magmatic hydrothermal mineralization process.
    Investigation on the Process of Recovering Micro-fine Oxide Ore of Manyingou Iron Mine by Slon High Intensity Magnetic Separator
    CAO Wei-Guo, ZHANG You-Feng, HOU Jun-Yi, YANG Xiao-Ying
    2008, 38(9):  97-99+125. 
    Asbtract ( 1458 )  
    Related Articles | Metrics
    Investigation is carried out on the thickener feed, underflow and overflow of Manyingou Iron Concentrator by varying the size of the magnetic media of Slon high gradient magnetic separators in scavenging. IT aims to reduce the tailing grade and improve the iron recovery.
    Investigation on Cyanide Leaching Process for Gold Concentrate Ultra-finely Ground with Stirring Mill
    DONG Ying-Bo, LIN Hai
    2008, 38(9):  100-103. 
    Asbtract ( 1610 )  
    Related Articles | Metrics
    The paper studies the cyanide leaching process for gold concentrate（-20 μm＞97% )ultra-finely ground by wet stirring mill grinding method，discusses the factors influencing the cyanide leaching of gold concentrate and compares its cyanide leaching indexes with those of the gold concentrate ground by conventional wet tumbling ball mill grinding method. The results indicate that the optimization of the factors of sodium  cyanide leaching can greatly shorten the cyanide leaching time，reduce the dosage of sodium cyanide and lime by 1 kg/t and 1.47 kg/t respectively, improve the gold leaching rate by 0.49 percentage point and reduce the gold content in the leaching residue by 0.21 g/t. The optimization effects are very obvious.
    Numerical Simulation of Vibration Screening Process and Its Progress
    LIU Guang-Huan, TONG Xin, XIN Cheng-Tao
    2008, 38(9):  104-106+110. 
    Asbtract ( 1491 )  
    Related Articles | Metrics
    Vibrating screen is presently the most used screening machinery in engineering and screening performance is a major issue in its design and application. However, the available screening theories can not well solve the issue. A numerical simulation method based on discrete element is presently used in simulating and analyzing the screening. The research practice has proven that it is an efficient tool for granular dynamics analysis. The paper introduces the background of the research on vibrating screen and the basic theory of discrete element method, reviews the application of discrete element method in screening field and discusses the main difficulties in screening simulation and the issues to be solved in its future development.
    CMOS Chip-based Intelligent Anti-Skid System for Incline-use Mine Tramcars
    MEI Kai-Xiang, MEI Jun-Jin
    2008, 38(9):  107-110. 
    Asbtract ( 1931 )  
    Related Articles | Metrics
    In light of the fact that there are occasionally tramcar accidents in incline transport in mining, a CMOS chip-based digital detection and intelligent anti-skid system is developed. The paper points out the defects of the domestic available passive anti-skid devices and analyzes the advantages of this active anti-skid system, including automatic speed detection, digital display, intelligent control, over-limit alarm and real-time reliable braking, tactful conversion of the mechanical force of the car into its braking force and bootstrap energy supply. The self-locking conditions of the rail-clamping pliers in the braking system are deduced and a specific calculation case is cited.
    Research and Realization of  Single Track Double Hook Lifting Staggered Operation System
    SUN Zu-Ming, WU Xiao-Jie, ZHANG Cheng-Zhong, SONG Wei
    2008, 38(9):  111-112+118. 
    Asbtract ( 1964 )  
    Related Articles | Metrics
    The sectional area of the mine inclines that have been used for a long time is apt to decrease, which needs a great effort to correct. Based on the analysis of the inline lifting system for coal mines, it was proposed to adopt a single-track double-hook lifting solution. Programmable logic controller (PLC) technology was used to realize the linkage control of the railway switch. This single track double hook lifting staggered operation system was proven in practice to be stable and practical, thus solving the projecting problem in the incline transformation.
    Mine Closure and Landscape Reconstruction in Jinggezhuang Mine
    MA Xin-Hong, ZHOU Jin-Hua, FU Mei-Chen, CHEN Qiu-Ji
    2008, 38(9):  113-118. 
    Asbtract ( 2388 )  
    Related Articles | Metrics
    Mine closure is the end of the life cycle of a mine as well as the start of its new historical life. And mine closure is also both the base of new life and the key of regional sustainable development. Taking Jinggezhuang Mine in Kailuan mining area in Tangshan City as an example and based on the field survey and the planning and design of mine closure, the paper analyzes the change regularity of mine closure and landscape environment, the restoration plan of closed mine landscape, the design methods and requirements of landscape restoration for closed mines. It also analyzes the overall design of landscape reconstruction in mining area and puts forward the reconstruction technology of main landscape in Jing Gezhuang mining area. The practice shows that the plan and design of landscape reconstruction of mine closure is an important guarantee for the landscape security pattern in mining area.
    Farmland Restoration and Pollution Prevention in the Overlapped  Areas of Crop and Mineral Production
    FU Mei-Chen, HU Zhen-Qi, LIU Shuang
    2008, 38(9):  119-122. 
    Asbtract ( 1826 )  
    Related Articles | Metrics
    Farmland restoration and pollution prevention in the overlapped areas of crop and mineral production are currently the important tasks of land reclamation in China. Based on China's several ten years' experience in land reclamation and its research progress, according to the need of the national development and in view of the problems currently existing in the overlapped areas of crop and mineral production in China, this paper puts forward the environment quality impact mode in the process of farm land restoration and solid waste treatment, and the landscape pattern standard and ecological three-dimensional intensivism mode of reclaimed farmland. It also proposes the environment protection measures that should be taken in the construction in respect to the problems in the machinery utilization in farmland restoration project, describes the farmland pollution-free filling and dynamic filling technologies and the relevant environmental protection requirements, and brings forward the measures for controlling the quality in the ecological reconstruction of reclaimed farmland so as to promote a sustainable utilization of farmland.
    Numerical Simulation of the Seepage Stability of A Tailing Reservoir
    LI Gen, WANG Lai-Gui, CHEN Lei, WANG Feng-Jiang
    2008, 38(9):  123-125. 
    Asbtract ( 1851 )  
    Related Articles | Metrics
    To ensure the safe operation of tailing reservoir and to prevent and control its disaster accident due to seepage, FLAC3D is used to carry out the seepage numerical simulation calculation of the tailing reservoir. The result shows that there is a large speed vector at the gully, which can wrap the flowing sands and therefore, intensify the local damage. It is known from the figure that the dynamic pressure is the largest where the water head, gradient and hydraulic slope are the maximum, and the corresponding part is most likely to be destroyed by seepage, leading to an accident of the reservoir. The chosen section A-A's dam slope angle is evidently larger than the dam stability angle. FLAC3D software can be used to do a better simulation calculation of tailing reservoir's seepage, which can be of certain reference and guidance importance to the safe operation of tailing reservoir.
    Auxiliary Design of the Dynamic Reclamation of Mining Subsidence Area Based on DEM Spatial
    HAN Kui-Feng, KANG Jian-Rong
    2008, 38(9):  126-129. 
    Asbtract ( 1674 )  
    Related Articles | Metrics
    Firstly, a series of DEM (digital elevation model) data are produced by adopting the technologies of mining subsidence prediction and spatial data processing. Then, the land destruction type, scope and location data at different periods of time are extracted by DEM's spatial analysis technique. Based on these data, the auxiliary design of the dynamic land reclamation plan is made to satisfy the need of the design of a dynamic land reclamation plan and to better implement the principle of “balance between the occupation and mending” in the new land control law.
    Experimental Study on Adsorption of Pb2+，Ni2+ and Cd2+ from Waste Water by Natural and Modified Bentonites
    PAN Jia-Fen, LU Jie
    2008, 38(9):  130-133. 
    Asbtract ( 1597 )  
    Related Articles | Metrics
    Experimental study was made on adsorbing Pb2+，Ni2+ and Cd2+  from the simulated waste water by using natural Ca-betonite and modified betonite produced by a betonite factory in Yongquan，Weifang，Shandong respectively. The results show that the natural Ca- betonite and modified betonite produced by this betonite factory have high removal rates of Pb2+，Ni2+ and Cd2+  in the waste water and therefore，can be used as the absorbent for heavy metal ions of Pb2+，Ni2+ and Cd2+.
    Study on Heavy Metal Enrichment Characteristics of Mosses in Laowanchang Gold Mine and Their Ecological Rehabilitation Potential
    WANG Wen-Yun, ZHANG Chao-Hui
    2008, 38(9):  134-139. 
    Asbtract ( 1613 )  
    Related Articles | Metrics
    crispulum，Anombryum gemmigerum and Tortula yunnanesis of Laowanchang Gold Mine in Guizhou and their soil are determined by atomic absorption spectrometry. Of the ten metals in the soil，the average concentration of Hg exceeds the value specified in the state standard for the third class soil environment by 3.676~5.111 times and As，by 14.276~17.467 times，illustrating that the soil in Laowangchang Gold Mine has been seriously polluted by Hg and As. The concentrations of metal elements in mosses plants are generally high and have certain relation to those in the relevant soil. In the mosses plants，there is a positive correlation between Cr and As and between Au and Cu at 0.05 level，a negative correlation between Au and Hg at 0.05 level and an evident negative relation between Au and Hg at 0.1 level.Trichostomum crispulum and Anombryum gemmigerum can strongly enrich Au and therefore，can be used as the plant indicator for Au prospecting.Anombryum gemmigerum can enrich Cr，Zn and Co and can be used as the materials for the ecological rehabilitation in areas that are seriously polluted by Cr，Zn and Co.  Tortula yunnanesis can enrich Pb and can be used to enrich Pb，which will play a role of ecological rehabilitation in areas seriously polluted by Pb.
    Discussion on the Standard of Mine Atmospheric Pollutant Emission
    CHA Shu-Hua
    2008, 38(9):  140-142. 
    Asbtract ( 2410 )  
    Related Articles | Metrics
    The paper analyzes the defects in the current standard for atmospheric pollutant emission and puts forward the principle, framework, emission limits and basis for formulating a new standard. The emission limits should include the upper limit for emission concentration, the limit of unit product emission at exhaust funnels and the upper concentration limit for unorganized emission.
    Technical Research of HDS Process for Treating Acid Mine Drainage
    BAI Huai-Liang, ZHONG Tie, GAO Tong-Sheng
    2008, 38(9):  143-145+151. 
    Asbtract ( 2292 )  
    Related Articles | Metrics
    HDS（high density sludge）process is a highly efficient sludge recycling technology and has the advantages of improving reagent utilization rate，sludge concentration and sludge settling and thickening properties in treating acid mine drainage. It is widely used in acid mine drainage in foreign countries but is only under some research in China. study is made on the mechanism of HDS process in treating acid mine drainage by laboratory experiments in combination with literature study. Analysis is also made on the progress in its technical research and its application.
    On the Application of Reverse Osmosis Process in Treating Tailings Wastewater
    CHEN Wei-Shan, WANG Kai, HU Xiao-Hui, SUN Xing-Fan, ZHANG Xuan
    2008, 38(9):  146-148. 
    Asbtract ( 1724 )  
    Related Articles | Metrics
    Tailing waste water is produced in the exploitation and utilization of mineral resource. Reverse osmosis (RO) process is not much used in the tailing treatment in China. The paper introduces the RO process and its main experimental equipment, and makes a detailed description of the removal effect of the main ions by RO membrane and issues such as membrane fouling, providing a necessary basis for the future application of RO process in practical production.
    Study on the Dusting Mechanism of Super-fine Particulate
    XU Qin-Kun
    2008, 38(9):  149-151. 
    Asbtract ( 1693 )  
    Related Articles | Metrics
    In light that little study has been made on the control of common dusting source and even less systematic study on dusting mechanism, it is put forward that it is of primary importance  to make clear the dusting mechanism so as to control the dust from its source. Analysis was made of the force acted on the dust particulates and the preliminary study on the physical model of the dusting mechanism of super-fine particulates was also conducted. The results indicate that the dusting of 1~ 10 μm particulates is effected by mechanical force, rising force and ixodynamics; several micron-fine dust particulates can be made from stillness to getting the velocity identical to that of the mainstream in only a momentary time. The dusting of particulates is extremely complex and varied.
    Recovering Cobalt from Copper-Cobalt Containing Magnetite Ore
    ZHANG Gui-Zhong
    2008, 38(9):  152-154. 
    Asbtract ( 1469 )  
    Related Articles | Metrics
    The cobalt sulfides contained the ore can be separated by regrinding and bulk flotation to finally produce a qualified cobalt concentrate. Therefore, copper-cobalt separation operation is added. The investment estimation is made on the process, which indicates a substantial economic benefit