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

扫码分享

Table of Content

    15 October 2008, Volume 38 Issue 10
    Previous Issue    Next Issue
    Beneficiation Practice of Bauxite
    FENG Qi-Ming, LU Yi-Ping, OU Le-Ming , ZHANG Guo-Fan, XIAO Jin-Hua
    2008, 38(10):  1-4+12. 
    Asbtract ( 1762 )  
    Related Articles | Metrics
    Newest data of China's alumina industry development are used in analyzing the importance and objective of desilication in bauxite beneficiation. Based on the knowledge gained in long time theoretical research and practice of bauxite beneficiation, the authors elaborate the relationship between bauxite ore properties and its beneficiation, describe the process of “bauxite selective grinding-agglomeration flotation for silica removal” developed by the authors and its industrial application in Zhongzhou Aluminium Co., and discuss the existing problems in and future work orientation of desilication in bauxite beneficiation.
    Progress in the Research of Comprehensive Utilization of  Sub-marginal Ore and Ultra-lean Ore of Pan Steel
    GUO Ming-Bin
    2008, 38(10):  5-8+47. 
    Asbtract ( 1856 )  
    Related Articles | Metrics
    A detailed summary and analysis of the research on the comprehensive utilization of the sub-marginal and ultra-lean ore of PanSteel Mining Co. is made. It is concluded that the comprehensive utilization technology for the sub-marginal and ultra-lean ore of PanSteel Mining Co. is feasible and can achieve good economic, social and environmental protection benefits. Suggestions are also made on the future research.
    Characteristics of Mine Health & Safety Management and Standard System in Leading Mining Countries
    WANG Ying-Bo, LI Cui-Ping, LI Zhong-Xue
    2008, 38(10):  9-12. 
    Asbtract ( 1533 )  
    Related Articles | Metrics
    The paper reviews the organizational framework of the mine health & safety management in the leading mining countries in the world; analyzes the standard systems of mine health & safety management in some countries including mine health & safety standard systems, standard management organizational forms and mechanisms; and presents the theoretical characteristics of mine health & safety standard system, providing experiences and enlightenment for promoting the building and development of the standard systems of mine health & safety management in China.
    Progress in the Application of AE and CT in Research of Coal and Rock Fracture Propagation
    LIU Jing-Hong, JIANG Yao-Dong, ZHAO Yi-Xin
    2008, 38(10):  13-15. 
    Asbtract ( 1986 )  
    Related Articles | Metrics
    Acoustic Emission (AE) and Computerized Tomography (CT) scanning are important means to monitor the coal and rock fracture propagation. The paper reviews the development of AE and CT tests and their application in coal and rock field. In light of the advantages of AE and CT scanning tests, it is proposed to jointly use AE and CT in the research of coal and rock structure, facilitating an effective combination of the research of coal and rock fracture propagation with the internal fracture change of coal-rock mass, and providing a theoretical basis for the further research of the occurrence mechanism of impact ground pressure in coal mines.
    Research on the Shockwave Turbulence Area inside the Bend Tunnel by Numerical Simulation
    QIN Bin, ZHANG Qi, XIANG Cong, WANG Deng-Gui, LI Wei
    2008, 38(10):  16-20+28. 
    Asbtract ( 1946 )  
    Related Articles | Metrics
    The research of explosive shockwave can be significant for the weapon's damage efficiency evaluation, and also important for measuring the system security in mine explosive accidents.  When propagating through the bend tunnel, due to the limitation of rough wall, the explosive shockwave will produce reflection and superimposition to form a turbulence area, disturbing the energy distribution inside the tunnel. And the shockwave will recover to become “plane” in certain distance. In this paper, LS-DYNA software is utilized to simulate certain weak shockwave propagating through the bend tunnel and to find out the rule and characteristic of shockwave turbulence area inside the bend tunnel. The “plane wave” is quantitatively redefined using the overpressure/momentum ratio benchmarks by analyzing the numerical simulation results. The research result shows that the momentum ratio benchmark can be used to better define the “plane shockwave”, and the shockwave will assuredly recover to become plane in a distance of 5 times equivalent tunnel diameter behind the tunnel bending. In case of a bend corner angle  of 20°,45°,90°or 135°, the momentum attenuation coefficient is 0.993 7, 0.955 9, 0.911 5 or 0.816 7 correspondingly. The max peak overpressure inside the turbulence area can be estimated using the fitting formula listed in the paper.
    Investigation on the Formation Mechanism of Mine Underground Mud-Stone Flow and Numerical
    欧Yang-Zhi-Hua , WANG Sheng-Kai, QUAN Zhong-Xue
    2008, 38(10):  21-24+31. 
    Asbtract ( 2076 )  
    Related Articles | Metrics
    In rainy seasons, the water-saturated overlying materials caved in sublevel caving mining may be liquefied under blasting-caused dynamic load and rush into the stope to form an underground mud-stone flow, bringing a great danger to underground safety mining. By applying a dynamic non-linear coupled solid-liquid constitutive equation, the paper studies the liquefaction mechanism of saturated soil under the function of dynamic load and analyzes the relation between blasting dynamic load and underground mud flow. An OPENSEES infinite element numerical simulation is made for the underground mud flow events occurring many times in Chengchao Iron Mine. The result shows that dynamic load caused by blasting has direct impact on mud-stone flow. The final computing result conforms to that of numerical simulation, thus providing a basis for realizing a safety production of mine in rainy seasons.
    Experimental Study on the Acoustic Emission Characteristics of Rocks at Uniaxial Compression
    WU Yong-Sheng, YU Xian-Bin
    2008, 38(10):  25-28. 
    Asbtract ( 1745 )  
    Related Articles | Metrics
    SDAES digital acoustic emission (AE) instrument and the rock acoustic parameter testing system were used in the acoustic emission tests at uniaxial compression on two rock groups from Yunnan Dahongshan Copper Mine for studying the intrinsic acoustic emission characteristics of the rocks in relation to the time, stress and deformation during the uniaxial loading process, comparing the acoustic emission characteristics of the two groups of rock and on this basis, analyzing the breakage mechanism of the rocks. The result indicates that the acoustic emission regularities of the two groups of rock are basically the same. Except in the initial loading stage, there is good correlation between the rock acoustic emission activity and the volumetric deformation of the sample rocks. The micro-fracture formation and the expansion of the original fractures are the main cause for their acoustic emission and volumetric deformation. The acoustic emission rate does not fully accord with that of energy in the rock breakage process, with the former more sensitive than the latter and therefore more suitable for use in predicting the rock failure.
    An Orthogonal Regression Experiment on the Cemented Filling Strength of Total Iron Mine Tailings
    LIU Lei, LU Xian-Jun , WANG Gui-Fang, ZHANG Shuai
    2008, 38(10):  29-31. 
    Asbtract ( 1724 )  
    Related Articles | Metrics
    The experiment method of standard orthogonal regression design was used to conduct the study of the cemented filling strength of the total iron mine tailings in Hebei Province. The relationship between the cemented filling strength and such factors as the slurry density and cement dosage was analyzed. The regression equation for 28 d cemented filling strength was obtained, from which it is concluded that the increase of the slurry density or of the cement dosage can raise the strength of the cemented filling body, providing a theoretic basis for optimizing the mix of cemented filling slurry and the on-line automatic control of cemented filling strength.
    Motion Law of the Layered Filling Solids under Blasting
    XIAO Ding-Jun, ZHANG Ji-Chun, LIU Kai-De, HAO Ya-Fei, OU Yang-Ji , YANG Yong-Qing
    2008, 38(10):  31-34+63. 
    Asbtract ( 1707 )  
    Related Articles | Metrics
    Through the high-speed videography for the blasting process of concrete model containing layered filling solids, the motion process of layered filling solids under the action of blasting was observed and the motion law was discovered. The motion velocity variation of layered filling solids 2~4 cm away from the blast hole center can be divided into three sections, namely rapid decrease of velocity, basically stabilization of velocity and rapid decrease to zero. The motion velocity of layered filling solids increases with the increase of explosive amount. At a high explosive amount, the velocity decrease section is wider and the velocity stability section is narrower. The results provide a basis for a further study of the blasting effect on the layered filling solids in rockmass and the rockmass stability.
    Analysis of the Process Parameters of the Hydraulic Lifting Piping System in Deep-sea mining
    HAN Ning, XIA Jian-Xin
    2008, 38(10):  35-38. 
    Asbtract ( 1705 )  
    Related Articles | Metrics
    Of the current deep-sea mining processes, hydraulic lifting is the most prospective. However, hydraulic lifting system involves an enormous investment and many risks, and in emergency, a rapid emptying of the piping may be required to ensure no blockage in the piping. The stress of the slurry in piping is analyzed, a formula of the movement of the slurry in the hydraulic lifting piping in deep-sea mining established and the relationship between the pulp discharging velocity in the lifting piping and the slurry concentration & pipe diameter discussed. On this basis, four rapid discharging schemes are proposed and compared for the design of a pilot system.
    On the Strain-Softening of Geotechnical Constitutive Model and Weibull Distribution
    SUN Qiang, HU Xiu-Hong
    2008, 38(10):  39-42+47. 
    Asbtract ( 1888 )  
    Related Articles | Metrics
    The definition of strain-softening and strain-hardening is studied from the plastic work of constitutive curve. The relation between strain-softening and damage is analyzed by introducing the micro-structural “self-consistent” rule in mechanics of materials. In geotechnical engineering, the constitutive model for strain-softening medium is mostly described by negative exponent distribution or Weibull distribution. In view of this, the model for solving the parameters of constitutive formula for strain-softening media under Weibull distribution is analyzed and its parameter characteristics and the adaptability of the constitutive curve are also discussed.
    Numerical Simulation of the Support of Deep Workings in Beiminghe Iron Mine
    ZHANG Li-Xin, LI Chang-Hong, ZHAO Yu, WEI Hai-Tao
    2008, 38(10):  43-47. 
    Asbtract ( 1485 )  
    Related Articles | Metrics
    With the increase of mining depth, the workings deformation, floor heave and rib spalling will become serious and rational support modes should be adopted to satisfy a safe and efficient deep mining. Different support modes are taken at different sites for different wall rocks at Beiminghe Iron mine. The numerical simulation of the support values of 2# vein-crossing drift at -230 m level that passes through diorite, skarn and iron orebody, and the comparison of the displacement and the maximum stress before and after the support show That the bolting and shotcreting support has played a good role in stabilizing the wall rock.
    Research & Design of the Beneficiation Process for Separate Quality Improvement & Impurities Reduction of Iron Concentrate and Its Application Practice
    LUO Li-Qun, FANG Yong, CHEN Dian-Zhu, REN Jin-Rong, YANG Xin-Yue
    2008, 38(10):  48-51. 
    Asbtract ( 1517 )  
    Related Articles | Metrics
    There are a number of small sized magnetite ore concentrators in a region in Shanxi, which produce iron concentrates by low intensity magnetic separation that have an iron grade of only 61%～58% but an SiO2 content as high as 12%～15%, not conforming to the guideline of good burden preparation for blast furnace iron-making and seriously affecting their sales. Based on the experimental research and in light of the local real conditions, a separate concentrator for their upgrading has been designed and built for a centralized treatment of these iron concentrates, which adopts a process consisting of reverse flotation, middling regrinding and low magnetic separation, and a high efficient anionic collector LP-4 that can be used in normal temperature. Now, this separate concentrator is running stably and has a good adaptability. It is capable to raise the iron grade of the concentrate to 67.2%～66.5%and reduce the SiO2 content to 5.2%～5.8%, demonstrating a good effect of quality improvement and impurity reduction.
    Influence of the Siderite in Donganshan Iron Ore on Reverse Flotation
    ZHANG Zhao-Yuan, 吕Zhen-Fu , YIN Wan-Zhong, HAN Yue-Xin
    2008, 38(10):  52-55. 
    Asbtract ( 1718 )  
    Related Articles | Metrics
    In recent years, the content of carbonate minerals in Donganshan iron ore has been increasing, leading to deteriorated reverse flotation performances or even “unclear separation between concentrate and tailing”. Based on single mineral flotation tests, SEM and EDS analysis means were used to study the case. The result shows that the adsorptive cover of siderite that is weakly depressible by starch on the hematite and quartz is the main cause for difficult reverse flotation of Donganshan iron ore containing carbonate minerals. Therefore, the key in realizing an efficient separation between the iron minerals and the quartz is to separate the siderite prior to the reverse flotation or to find a flotation agent capable of effectively activating or depressing siderite.
    Causes and Solution for the Low Gold Leaching Rate at a Certain Gold Mine
    YANG Lei, LIU Hou-Ming, LIU Fei-Yan, PAN Zhi-Bing
    2008, 38(10):  56-59+63. 
    Asbtract ( 2214 )  
    Related Articles | Metrics
    A gold mine adopted a heap leaching process but the gold leaching rate had been low. No evident improvement was made when a full-ore cyaniding leading process was tested. A process mineralogical study was thus made and it was founded that it is mainly realgar and orpiment that affect the gold leaching. Based on this result, a test was made, in which the run-of-mine ore was first treated by flotation to remove the sulfides such as realgar and orpiment, and the flotation concentrate was treated by cyaniding leaching after a pre-treatment while the flotation tailing was directly fed to cyaniding leaching. The total gold leaching rate reached 88.52%, an increase of 25.02 percentage points compared with that of direct cyaniding leaching of run-of-mine ore.
    Experimental Research on the Iron Separation from a Low Grade Vanadiferous Titano-Magnetite Ore
    ZHANG Jun-Hui, ZHANG Yuan
    2008, 38(10):  60-63. 
    Asbtract ( 2004 )  
    Related Articles | Metrics
    Test was made on separating iron from a low grade Vanadiferous titano-magnetite ore by a process of tailing discarding at a coarser size, staged grinding and staged low intensity magnetic separation. The results show that when the run-of-mine ore is treated by double-layered roll type magnetic separators including low and high intensity magnetic separation at 10~0 mm size, qualified tailings of about 9% yield can be discarded, with an iron loss in the coarse tailing being only about 3%. The coarse concentrate is grounded in two stages, with the first stage grinding size being 50% -200 mesh and the second stage, 85% -200 mesh, and then treated by two stage low intensity magnetic separation. As a result, an iron concentrate containing 57.08% iron and 11.92% TiO2 and having an iron recovery of 53.16% can be achieved.
    Lab Test on the Uranium Leaching by Thiobacillus Ferrooxidans
    LIU Jin-Hui, WU Wei-Rong
    2008, 38(10):  64-66. 
    Asbtract ( 1742 )  
    Related Articles | Metrics
    Using self-designed test equipment, a lab test was made on the uranium leaching adopting Thiobacillus ferrooxidans (T.f )that was separated from uranium ore samples and then purified and domesticated. A two-staged test of acidification and leaching on four samples achieved an average uranium leaching rate of 85.6％ by liquid and of 88.3％ by slag, an relatively ideal leaching result.
    Experimental Research on Improving the Quality of Pellet Made of Daye Iron Concentrate
    KANG Xing-Dong, XIA Chun-Cai, CHEN Zhi-Ying, LIU Jian-Peng, MA Lei, ZHANG Hua-Li
    2008, 38(10):  67-69+75. 
    Asbtract ( 2014 )  
    Related Articles | Metrics
    The measures for producing high quality pellets from Daye iron concentrate are found through pelletizing test. The test result indicates that when using a Daye iron concentrate which contains 93.35% -0.074 mm fraction, 2% Linan betonite as binder and 8.0% moisture, through strict control of the pelletizing time and the material and water feeding rate and mode, fine quality pellets can be produced. The green balls have a drop strength at 0.5 m greater than 3.8 times, a compressive strength of 12.0 N per ball and a burst temperature of higher than 450 ℃. The compressive strength of the pellet product is greater than 2.5 kN per pellet.
    Valuation of the Uncertainty in Determining the Nickel Content in Nickel-Bearing Laterite by Flame Atomic Absorption Spectrometric Method
    HU Shun-Feng, LI Yi-Xuan, SU Zheng, ZHANG Yue-Sheng
    2008, 38(10):  70-71+80. 
    Asbtract ( 1677 )  
    Related Articles | Metrics
    A mathematic model for the uncertainty in determining the nickel content in nickel-bearing laterite by flame atomic absorption spectrometric method is established. The relevant uncertainties are classified in terms of components. The uncertainty of each component class, their combination standard uncertainty and expanded uncertainty are computed.
    Application of Minesight Software in Geological Reserve Verification
    CHEN Lin
    2008, 38(10):  72-75. 
    Asbtract ( 1583 )  
    Related Articles | Metrics
    Minesight software developed by US MINTEC can be conveniently used to make exploration plan, geological modeling, mining design and mineral resource evaluation. The paper presents some of its functions and mode of data exchange and discusses the procedure of applying it to evaluate the geological reserve for mining right purchase. It is concluded from practical applications that in using Minesight to evaluate mineral resource, the key factors include geological conditions, neighborhood estimation and system errors.
    Design and Experiment Research of the Binary Current Lead for SEIR System
    MA Wen-Bin, ZHU Zi-An, LIU Li-Qiang, YI Chang-Lian, WANG Mei-Fen, HOU Zhi-Long
    2008, 38(10):  76-80. 
    Asbtract ( 2170 )  
    Related Articles | Metrics
    Binary current lead is one of the key parts of superconducting electromagnet iron remover (SEIR) system. It mainly consists of a copper current lead at the upper end, an intermediate heat exchanger and a high temperature superconductor (HTS) current lead at the lower end. A 200A binary current lead with a central magnetic induction strength of 3T is designed. The heat leak of the current lead, the internal heat resistance of the exchanger and the welding resistance between HTS line and the copper matrix are measured and the transient temperature change of the current lead at a cryocooler breakdown or power failure is studied. Both the theoretical and experiment results show that the designed current lead can satisfy the performance requirement for the operation of superconducting electromagnet iron remover (SEIR) system.
    Application of ANSYS/FLOTRAN in Optimizing Impinging-Stream Dusting System
    YAO Shi-Dong, WANG Yong-Qiang, CHEN Hai-Yan
    2008, 38(10):  81-83+130. 
    Asbtract ( 1679 )  
    Related Articles | Metrics
    Impinging stream dusting technology has its unique advantage in collecting dust of high humidity and high viscosity. Different from most researches in which the dusting efficiency is improved by optimizing the working conditions, this research addresses the issue from the duster's structure. FLOTRAN module in ANSYS, a finite element analysis software, is used to simulate the inside flow filed so as to get he velocity vector distribution. Based on the simulation result, the duster structure is optimized, enabling it to get a flow field distribution that is most beneficial to the improvement of dusting efficiency. The optimal dusting conditions obtained from the real test basically accord with the parameters optimized by numerical simulation. Therefore, it is feasible to optimize the parameters of a duster structure by the velocity vector field obtained by numerical simulation.
    Mathematic Model for the heat and Moisture Transfer Between Wall Rock and Airflow and Its Application
    WANG Bo, CHEN Bao-Zhi, CHEN Xi-Shan, LI Yuan-Hui
    2008, 38(10):  84-86+122. 
    Asbtract ( 1564 )  
    Related Articles | Metrics
    In light of the reality of Jinqingding mining area of JinZhou Mining Group, a mathematical model for the heat and moisture transfer between wall rock and airflow was established. The comparison with the practically site-measured result shows that the incoming airflow temperature distribution obtained by the numerical simulation is very close to that practically measured, especially the change in depth and horizontal direction. It reflects the variation of the incoming airflow in a real stratum pre-cooling and temperature reducing system in an abandoned inclined shaft, discloses the law of heat exchange between wall rock and airflow, and proves the feasibility of the established prediction model in geotemperature reducing analysis and in the real design of a ventilation system.
    Public Geographic Information Service System Based on ArcGIS Server 9.2
    LAN Xiao-Ji, YU Zeng-Lin
    2008, 38(10):  87-91. 
    Asbtract ( 1645 )  
    Related Articles | Metrics
    ArcGIS Server is a platform for constructing centralized management, multi-users supporting enterprise-level GIS applications. It is mostly characterized by providing Internet-based high level GIS service. The paper describes the basic characteristics and architecture of ArcGIS Server and the new functionality of ArcGIS Server 9.2 version, and explores the interior mechanism of ArcGIS Server application development framework and the modes of developing WebGIS application using this ADF. The feasibility of using this framework to tailor-make WebGIS application is demonstrated by the development of an urban public geographic information system.
    AMEsim-based Motion Simulation and Control of Hydraulic Excavator
    WANG Tao, TAO Wei
    2008, 38(10):  92-93+96. 
    Asbtract ( 1644 )  
    Related Articles | Metrics
    The hydraulic excavator's manipulators were modeled by applying French software of AMESim. The main model parameters were set, and the motion simulation of its integrative mechanics-electronics- hydraulics system was accomplished. Furthermore, the good tracking performance and automatic excavation were achieved by using PID controller for the hydraulic cylinders of its beam, stick and bucket, providing an effective method for the designers.
    A New Algorithm of Trajectory Planning of the Base Arm of Robot
    BAO Shao-Jun, FAN Bing-Hui, NING Hong-Tao, DING Sheng-Hua, WANG Yue-Ting
    2008, 38(10):  94-96. 
    Asbtract ( 1503 )  
    Related Articles | Metrics
    By constructing a polynomial function by means of the fitting of numerical method and by establishing the direct and reverse mathematical relations between the two key variables, the trajectory planning of the base arm is made, which is verified by simulation analysis.
    Conversion between XML-Based Mining Heterogeneous Data and Relational Data
    LIU Xin-Liang, LI Wen-Zheng, SUN Jian-Zhi, HAN Zhong-Min
    2008, 38(10):  97-99. 
    Asbtract ( 1477 )  
    Related Articles | Metrics
    With the popularization of information technology and the development of Web technology, it has become a challenge how to use unified XML information description standard to define the data from various sources as most of the data information in the early mining systems are relational data. The conversion between XML data and relational data is studied and a data interactive access between relational data and heterogeneous data sources has been realized, providing a solution to a Series of practical problems and being of practical value.
    Remote Control System of Underground Load-Haul-Dump Vehicles
    LI Wei-Wei, HU Tian-You
    2008, 38(10):  100-102+140. 
    Asbtract ( 1636 )  
    Related Articles | Metrics
    The remote control system for underground load-haul-dump vehicles (ULHD) is composed of a   wireless data transmission system and an onboard computer control system. The wireless data transmission system adopts two professional data transmission radio sets for the transmission of vehicle status information inspection and control signals and the data transmission of video monitoring devices. The onboard computer system adopts a distributed control system and an asynchronous communication mode. The upper PC receives the remote control command from the remote control room and interprets, decomposes and transmits it to the lower PLC, which will execute the command to control the ULHD's operation.
    Mine Control & Management Integration System
    XU Bo, HU Nai-Lian, ZHANG Pei-Ke
    2008, 38(10):  103-106. 
    Asbtract ( 1813 )  
    Related Articles | Metrics
    How to realize a control & management integration of operation decision, production process management and process control is a key issue for mining enterprises. ERP/MES/PCS architecture-based control & management integration system is a necessary for realizing the security of mine production and improvement of the production output and efficiency. A ERP/MES/PCS model architecture for mining enterprises integrating advanced management thought and top technology is put forward. On this basis, functions and objectives of the system are planned. The system has been applied in a specific case of Jiaojia Gold Mine of Shandong Gold Mining Co., Ltd.
    Application of Home-made Diaphragm Pump in Long Distance Slurry Pipeline Transport in An Steel
    LIU Xiao-Ming, ME Ke-Wei, WANG Jian
    2008, 38(10):  107-109+115. 
    Asbtract ( 1520 )  
    Related Articles | Metrics
    The paper describes briefly the development of diaphragm pump, analyzes the structure of diaphragm pump, introduces the application of home-made diaphragm pump in the converter sludge pipeline transport of An Steel Works and in the high-density tailing slurry pipeline transport of Donganshan Sintering Plant and points out that the home made diaphragm pump, when rationally chosen, has a strong competitiveness and good development prospect in long distance, high pump lift and high viscosity slurry pipeline transport.
    Material for the Stator of Vane Air Motor and Optimization of Its Processing Technology
    YAN Ji-Fen
    2008, 38(10):  110-111+115. 
    Asbtract ( 1709 )  
    Related Articles | Metrics
    The stator of vane air motor is conventionally made of medium carbon alloy steel such as 40CrMnMo and processed by a technology including integral quenching.  In the research, rare-earth magnesium ductile cast iron material was selected for the stator and processed by a technology including hardening or normalizing treatment. The stators made of the above two materials respectively were compared and proven to have an equivalent wear resistance. But, the newly selected material and the new processing technology can remarkably ease the processing, improve the product qualification rate and save the cost. This technology has achieved good results in its industrial application.
    Application of Ethernet Communication Technology in Ekou Iron Pelletizing Plant
    LI Peng-Qiang
    2008, 38(10):  112-115. 
    Asbtract ( 1702 )  
    Related Articles | Metrics
    The paper describes briefly the industrial Ethernet communication technology and highlights the hardware composition, software composition and connection of system communication of the control system of Tai Steel Ekou Iron Pelletizing Plant. Siemens PLC is used to form the site-level control system which is realized by Siemens S7 software. With Simatic Wincc as the configuration software of the upper system and by adopting Ethernet communication technology, the various site data and parameters are displayed in real time, realizing the control of the remote upper computer over the site-level control system. This network has been running stably and reliably since putting into use, with a zero fault rate, well satisfying the requirement of a rapid real-time control of the process.
    Mechanism of Water Effect on the Stability of Tailing Dam
    QIN Hua-Li, MA Chi-Xiang
    2008, 38(10):  116-118+152. 
    Asbtract ( 1707 )  
    Related Articles | Metrics
    According to the statistic data, of all the accidents, about 1/3 are caused by floodwaters. Tailing dam is a main facility of tailing reservoir and its stability is very relevant to water. The study of dam stability is a very complicated issue and involves a series of variables difficult to accurately determine such as underwater level, rainfall, mechanics parameters etc. As is commonly known, accidents such as landslide and dam failure are often closely related to water. However, such relation has not been fully recognized and understood. In view of the water's important effect on the safety operation of tailing dam, the paper describes the two ways in which water affect the dam slope and discusses water's effect in the dam stability and its mechanism in relation to the water role in landslide disaster.
    Analysis of Mine Ventilation Systems Based on Operational Research
    ZHOU Shu-Feng, TAO Gan-Qiang, CAO Wei, SONG Li-Xia
    2008, 38(10):  119-122. 
    Asbtract ( 1893 )  
    Related Articles | Metrics
    Operational research is a science of technology that adopts analysis, test and quantification methods to make a comprehensive arrangement of the limited resources to realize an efficient operation of a practical system. It can be used to forecast a development trend, formulate an action standard or optimize a feasible plan. Mine ventilation system is a complex one composed of crisscross shafts and tunnels and is a general term for ventilation network, ventialation power and ventilation structures. The ventilation network is an abstract description of the ventilation by points, lines and attributes. In light of the real ventilation conditions in the mining production, the air flow in the ventilation system can be classified into natural air flow, restricted air flow and semi-restricted air flow. Of them, the natural air flow generally  can not provide sufficient wind volume for mining and therefore, restricted air flow and semi-restricted air flow are used in most of the mine ventilation systems. We apply the operational research in the mine ventilation system mainly for the linear programming of the restricted air flow, non-linear programming of the semi-restricted air flow and network analysis and simulation to find the best solution.
    Management Information System of the Production Safety and Technical Measures for Mine Working Faces
    LU Guo-Bin, GUO Ling-Ling, ZHAO Ji-Wei
    2008, 38(10):  123-125. 
    Asbtract ( 1778 )  
    Related Articles | Metrics
    Safety is always the most important and serious issue faced by coal mining enterprises. According to the statistics, about 20% -50% of the accidents were due to the omissions in the rules of production safety and technical measures. In light of the reality and the need of the production management of Longhu Coal Mine, using UML as the modeling language, Rational Rose as the modeling tool, PowerBuilder 9.0 as the developing tool and SQL Server2000 as the background database, a management information system of the production safety and technical measures for the mine working-face was established, realizing the compilation of production safety and technical measures for each working face.
    Research on the Preparation of TiO2 Film Immobilized on Wire Net and Its Photocatalytic Performance
    LEI Shao-Min, ZHAN Chang-Lin, Bo Jin, HUANG Cheng, XU Tian-Yi
    2008, 38(10):  126-130. 
    Asbtract ( 1731 )  
    Related Articles | Metrics
    The effects of film coating number, roasting temperature and initial concentration of azo dye on the photocatalytic activity of immobilized titanium dioxide film of metal wire net were investigated, which was prepared by TiO2 colloid synthesis, TiO2 colloid film coating on stainless steel net surface by dip-coating method and then its immobilization on the net by roasting. The results indicate that the film can have excellent photocatalytic performances when roasted at 600～700 ℃ for 2 hours. When it is used to make a photo degradation for three hours for 27 mg/L azo dye, the decolorization rate of azo dye reaches 99.07%. The crystal film is bonded tightly on the metal net surface t, and will keep a good photocatalytic activity when the film is used repeatedly.
    Application Perspective of Mycorrhizas in the Vegetation Restoration in Red Mud Tailing Dam
    LI Xiao-Ping
    2008, 38(10):  131-134. 
    Asbtract ( 1985 )  
    Related Articles | Metrics
    As a mutual symbiosis formed between plants and soil mycorrhiza fungi, Mycorrhiza plays a key role in protecting host plants against environmental stress. Red mud is the high alkaline tailings from the production process of alumina, the tailing dam of red mud has adverse environmental impacts and its vegetation construction can be very difficult. This paper discusses the role of mycorrhiza and its application in the soil remediation in mining areas, and also the technological strategies of applying mycorrhiza in vegetation restoration of red mud tailing dam. It is concluded that applying mycorrhiza technologies to the vegetation construction of red mud tailing dam is feasible through extensive investigation and selection testing of mycorrhiza fungi and its suitable plants.
    Effect of Microwave Treatment on the Adsorption Performance of Attapulgite
    YAO Ying, HE Le-Ping, ZHAO Ping
    2008, 38(10):  135-137. 
    Asbtract ( 1706 )  
    Related Articles | Metrics
    The raw attapulgite was activated with HCl and then by microwave heating activation and conventional heating activation. The effect on the adsorption of methylene blue on the attapulgite of conventional activation heating temperature and microwave activation heating time were investigated. The results indicate that with respect to the attabpulgite under investigation, the optimal temperature for conventional activation is 200 ℃ (activation time of 2 h）and the optimal time for microwave heating activation is 2 min (the microwave oven has an output power of 750 W). The methylene blue adsorption capacity of the attapugite activated by microwave heating activation for 2 min, and  that by conventional heating activation at 200 ℃ and that un-activated were compared. The result indicates that the adsorptive capacities of the attapugite activated by both heating activation methods are evidently improved. Though the adsorption capacity of the attapugite treated by microwave heating activation is slightly lower than that by the conventional method, microwave heating activation needs a time that is only 1/60 of the conventional method, thus greatly saving the energy. Moreover, it has a simple process.
    Environment Issues Caused by Ultra-lean Magnetite Ore Exploration and Their Control
    QIN Yu-Min
    2008, 38(10):  138-140. 
    Asbtract ( 1485 )  
    Related Articles | Metrics
    The paper analyzes the main environment issues in the exploration and utilization of ultra-lean magnetite ore and, in light of the characteristics of the pollutant discharge and the resultant ecological environment destruction, puts forward the countermeasures and suggestions.
    Hydrates and Paste Structure of the Cementing Material with High Proportion of Sea-Discharged Ash
    WAN Jian-Hua, SUN Heng-Hu, WANG Yan, WANG Ying-Ying
    2008, 38(10):  141-144. 
    Asbtract ( 1942 )  
    Related Articles | Metrics
    A kind of cementing material with a mass proportion of sea-discharged ash (SDA) is prepared with solid SDA as the main raw material and a small amount of rock forming agent composited by several minerals.  Its hydrates and paste structures at different ages are analyzed using XRD, SEM and FTIR. The results show that ettringite is one of the main sources for the early strength of this cementing material; its hydrates mainly occur in frame-structural silicon oxygen tetrahedral gel with high polymerization degree, in addition to some chain-structural CSH gel; and with the hydration going on, the content of Ca(OH)2 decreases gradually along with an increase in the polymerization degree of silicon oxygen tetrahedron and a gradually denser paste structure.
    Synthesis of Ca-α-SiAlON/SiC Powder with Gold Tailings
    ZHANG Xiao-Meng, XU Li-Hua, HAO Hong-Shun, LIU Ming, HE Fang, GUO Yu-Juan
    2008, 38(10):  145-148. 
    Asbtract ( 1770 )  
    Related Articles | Metrics
    Ca-α-SiAlON/SiC powder was produced by carbothermal reduction-nitridation method and using the gold tailings from Henan Lingbao Gold Mine as the main raw material, and a proper amount of silica and calcium oxide of analytical grade as regulator. The results show that the formation of Ca-α-SiAlON is dependent on the system temperature and the amount of CaO. With the rise of reaction temperature, the reaction products are formed in sequence of SiC, α-Si3N4, β -Si3N4 and Ca-α-SiAlON. α-Si3N4、β-Si3N4 and SiC are intermittent products in synthesizing  Ca-α-SiAlON. At a sintering temperature of 1 600 ℃, a temperature retaining time of 5 h and a stoichiometrical proportion of 4.2% CaO, good Ca-α-SiAlON and SiC compound product can be obtained, with the elongated grain Ca-α-SiAlON amounting to about 72%.
    Experimental Research on Recovering the Iron from Iron Tailings of Jinling Mine
    ZHANG Qu-Fei
    2008, 38(10):  149-152. 
    Asbtract ( 1372 )  
    Related Articles | Metrics
    In light of the fact that there is small amount of strongly magnetic iron-bearing minerals in the tailings of Jinling Iron Concentrator, the process for recovering the iron from the tailings was studied. As a result, a process consisting of one roughing and one cleaning by low intensity magnetic separation and re-concentration by magnetic separation column was adopted, which obtained an iron concentrate having a grade of 45.87% and a recovery of 5.21% from tailings containing 3.70% iron.