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Table of Content

    15 May 2008, Volume 38 Issue 05
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    Progress in Iron Separation Technology
    LI Zhen, LIU Jiong-Tian, WEI De-Zhou, ZHU Jian-Feng, LIU Li-Jun, DING Qi-Peng
    2008, 38(05):  1-6. 
    Asbtract ( 1509 )  
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    The paper analyzes the present iron ore resource conditions; reviews the current typical separation processes including process of gravity separation-low intensity magnetic separation-high intensity magnetic separation-reverse flotation, total low intensity magnetic separation process, low intensity magnetic separation- flotation combined process, and roasting-low intensity magnetic separation-high intensity magnetic separation-reverse flotation; summarizes the highly effective separation equipment including high intensity magnetic separator, magnetic separation column, CSX magnetic-field screener, high frequency vibrating fine screen and cyclonic-static micro bubble flotation column; reviews the progress in iron separation technology; and looks forward to the development trend of iron separation.
    Effect of Temperature -Water on Dynamic and Static Elastic Parameters of Sandstone at Depth
    ZHOU Li, LI De-Jian, WANG Chun-Guang
    2008, 38(05):  7-11. 
    Asbtract ( 1984 )  
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    Through the ultrasonic test on the dry and water-saturated samples of deep sandstone of Hegang Nanshan Mine, the variation law of the elastic wave velocity of the sandstone at dry and water saturated states in relation to the temperature was deduced, which was then compared with the static elastic parameter in the uniaxial compression test. The results indicate that when the temperature rises from 20℃to 95℃, the elastic wave velocities of the two samples vary in different trends with greatly different variation scopes. The wave velocity of the dry sandstone is smaller than that of the water-saturated sample, and with the temperature increase, their wave velocity ratio curves become more complex in different variation trends. The dynamic and static elastic moduli of the dry sample are greater than those of the saturated sample, with the dynamic elastic moduli greater than the static ones. The variation of their dynamic and static Poisson's ratios is not regular.
    Analysis of Normal Fault Stress and ANSYS Numerical Simulation Based on Beam Model
    XU Xiao-Li, JI Ming, GAO Feng, LIAO Meng-Ke, GAO Ya-Nan
    2008, 38(05):  12-14+153. 
    Asbtract ( 1592 )  
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    Coal mining can often encounter with faults. Based on beam model, stress analysis and ANSYS numerical simulation are made for the normal fault of coal rock stratum. The fault stress value is considered to have relation with the load concentration and inclination angle of the fault. The ANSYS numerical analysis has draw a conclusion that is basically in conformity with that by the theoretical analysis of beam model, and therefore, can be used as reference for the support of broken roof.
    Study on Underground Stope Parameters after Tailings Discharge into Open Pit in Chengjiagou Iron Mine
    ZHANG Yan-Bo, LI Zhan-Jin, GAN De-Qing
    2008, 38(05):  15-19. 
    Asbtract ( 1541 )  
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    In view of the fact that Chengjiagou Iron Mine utilizes its discarded open pit for tailings deposit, simulation study is made on the stability of underground stope when the open pit is used for tailings deposit by ANSYS 3D finite element numerical simulation method based on the analysis of the mine engineering geological, hydrogeological and ore-rock physical mechanic parameters and in light of the mine reality. As a result, the appropriate tailing heap height and underground stope structural parameters are determined and specific engineering control measures are proposed for potential problems.
    Analysis of High, Steep Slope Sliding in Baiyun East Mine and Its Regulation Measures
    ZHANG Huai-Jing
    2008, 38(05):  20-23+116. 
    Asbtract ( 1898 )  
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    In combination with the slope instability in Section C of Baiyunebo Iron Mine, the simulation calculation and the stability analysis and evaluation are made for the present state and the future state when the excavation is completed according to the original plan by selecting representative sections and using discrete element software UDEC. The simulation results are compared and analyzed. The unloading and consolidation scheme for the instable slope in Section C is proposed based on the site condition and simulation results.
    Comparative Study of Forecast of Price-Time Series of Uranium Products based on BPNN and ANFIS
    WANG Yuan-Yuan, YANG Shi-Jiao, DAI Jian-Yong
    2008, 38(05):  24-27. 
    Asbtract ( 1990 )  
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    The policy decision system for mining project investment involves such main variables as mineral product price, production cost, market demand and risk interest level, of which ore price has the dominant role. It is in non-linear variation and difficult to forecast by using classic time series theory, leading to a difficult realization of the optimization of the policy decision system for mining project investment. Taking uranium resource as example, BP neural network and adaptive neuron-fuzzy inference system are used, in combination with time series technique, to build BPNN and ANFIS time series models of the uranium product respectively. Comparative analysis of the forecasts of the uranium product price is made. The result indicates that ANFIS time series can better forecast the price than BPNN time series does.
    Coupling Analysis of Seepage Field and Stress Field in Tailings Discharge into Mined-out Open Pit
    CHEN Chao, ZHANG Ya-Bin, GAN De-Qing
    2008, 38(05):  28-31+113. 
    Asbtract ( 1595 )  
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    In the tailings discharge into the mined-out open pit during the transfer period of open casting to underground mining, the mutual effect of the seepage field and stress field can lead to the complication of the analysis of the room roof stability in underground mining. The paper, by means of finite element software simulation technology, analyzes and summarizes the distribution law of the seepage field and stress field of the mined-out open pit under different excavation and tailing discharging conditions, and makes the coupling analysis of the two fields. The coupling analysis result indicates that the roof of the underground room is stable when the maximum discharged tailing height is no more than 40m.
    Classification for Rockmass Blastability Based on Attribute Recognition Theory
    LI Rong, SONG Juan, HE Yong-Yan
    2008, 38(05):  32-34+48. 
    Asbtract ( 1856 )  
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    The specific density, tensile strength, impact dynamic strength and intactness coefficient of rockmass are chosen as the criterion indices for rockmass Blastability classification. An attribute measurement model for the rockmass blastability classification-discrimination is established based on similar weights which are defined by similar figures and determined in accordance with objective standard for indices, and by using attribute recognition theory. The application method of the model and the classification-discrimination process of rockmass blastability are demonstrated by the specific discrimination of the test data of some rock samples. As the attribute recognition theory can well solve the comprehensive assessment for a kind of issues involving several fuzzy attributes, and the confidence criterion is proposed on the basis of ordered evaluation sets, the assessment results are more reliable. Meanwhile, as the assessment model adopts objective weights, the subjectivity and randomicity can be avoided in the weight determination, thus guaranteeing the objectivity and accuracy of the assessment.
    Study on Quantified Representation of Microdefects in Rock Fracture Destruction Process
    ZHANG Fei, CHEN Shi-Jiang
    2008, 38(05):  35-36+43. 
    Asbtract ( 1855 )  
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    The quantitative characterization of the microdefects of rock fracture process has always been the key of CT image analysis. The whole process of the  quantified representation of microdefects is detailed in combination with fractal theory. The change law of the fractal dimension in rock fracture destruction process is also discussed, laying a foundation for a true understanding of rock destruction mechanism.
    Research on Mining Method of Yanqianshan Iron Mine in Transition from Open-Pit to Underground Mining
    MA Xu-Feng, XU Shuai, LIU Xian-Feng
    2008, 38(05):  37-39. 
    Asbtract ( 1645 )  
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    In light of the demand of the production transition from open pit to underground mining at Yanqianshan Iron Mine, AnSteel Group's Anshan Mining Co, and its orebody occurrence conditions and ore-rock characteristics, the authors points out two main issues that should be paid attention to in the production during the transition period, namely, the overlying layer thickness and the recovery of wall hanging resource, and analyze and discuss three possible underground mining methods, which can be of some guidance significance to the production during the transition.
    Research on Mine Technical Index Optimization Based on Data Mining Technology
    WANG Xing-Dong, LI Ke-Qing
    2008, 38(05):  40-43. 
    Asbtract ( 1539 )  
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    Through the analysis of the basic characteristics of data mining technology, it was proposed to use it to solve the problems such as large volume of data and difficult modeling in optimizing the mine technical indexes. Based on the realization procedure of the mining technical indexes optimizing system based on the data mining, with Gongchangling Iron Mine as the background, data mining technology such as statistic and knowledge discovery was used to establish the model for the relationship between the production technical indexes of geology, mining, beneficiation and palletizing, and a systematic optimization was also made on these indexes. The research results show that the application of data mining technology in optimizing the mine technical indexes is not only feasible but effective.
    Study on Crystal Chemistry of Floatability of Several Sulfate Minerals
    LU Shuo-Shi, SUN Chuan-Yao
    2008, 38(05):  49-52. 
    Asbtract ( 1759 )  
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    The floatability of three minerals is in the sequence of barite＞celestite＞ gypsum in sodium oleate and salicylhydroxamic acid system and of gypsum＞celestite＞ barite in lauryl amine system. XPS and infrared spectrum analysis were used in studying the functional mechanism between collectors and minerals. The function between sodium oleate and the three sulfate minerals is found to be chemical adsorption; that of lauryl amine, physical adsorption; and that of salicylhydroxamic acid, chelating reaction. The theoretic calculation for the chemical bonds of mineral crystal structure indicate that the Mn+-O2- breakage degree in the crystal structure of these three minerals is closely related to mineral floatability.
    Optimization Investigation and Application of Grinding-Separation Process in Weitoushan Iron Mine's Concentrators
    GAO Lie
    2008, 38(05):  53-55. 
    Asbtract ( 1798 )  
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    In light of the characteristics of autogenous grinding of ore breakage along cleavage plane and wide size fraction of ground product, optimization was made on the grinding and separation process to realize an early liberation, early tailing discarding and early recovery so as to achieve best technical performance and maximum economic benefit.
    Research on Column Processing of Molybdentie
    吕Fa-Kui , LIU Jiong-Tian-
    2008, 38(05):  56-59+65. 
    Asbtract ( 1711 )  
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    Presently, the separation of molybdenum ore mostly adopts conventional flotation which has defects of long flowsheet, complex process and low efficiency. Cyclonic static micro bubble flotation column was used in the test on two Henan molybdenum ores of different types, and good separation performances were achieved in both cases. The successful practice of column separation has made a beneficial exploration in molybdenum separation process.
    Novel Process of Vanadium Extraction by Sodium Roasting from Panzhihua V-Fe Concentrate
    ZENG Shang-Lin, ZENG Wei-Long
    2008, 38(05):  60-62. 
    Asbtract ( 1830 )  
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    The effect of roasting temperature and time, and kind of sodium agent and proportioning on the roasting of Panzhihua V-Fe concentrate was studied. It is found that the best conditions for the roasting are: roasting temperature of 1 300 ℃, roasting time of 120 min, and Na2CO3 content of 6%. The results show that the recovery of vanadium extraction from V-Fe concentrate by sodium roasting and leaching is higher than that by pyrogenic process, and the vanadium leaching rate can be 86.91%.
    Research on Copper Recovery from A Mexico Cooper Ore by Flotation-Leaching- Extraction-Electrowinning Process
    CAO Zhan-Fang, ZHONG Hong, LIU Guang-Yi
    2008, 38(05):  63-65. 
    Asbtract ( 1910 )  
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    A Mexico copper ore is a mixed one that contains mainly oxidized copper minerals, quartz which is the main gangue and copper sulfide mineral (chalcopyrite)which is easy to float but inferior to oxide copper minerals in acid leaching efficiency and may produce harmful gas-sulfureted hydrogen. The key in this research is flotation-leaching process. The results show that a cooper concentrate grading 19.10% at a copper recovery of 35.02% can be obtained when sodium sulfide is used for activation and butyl xanthate for flotation. The flotation tailings are directly used in the downstream flotation test under the conditions of H2SO4 concentration of 1mol/L, liquid-solid ratio of 3, and one hour agitation at ambient temperature of 15 ℃. The copper leaching rate is 83.33% and 54.16% if calculated according to the run-of-mine ore. The total recovery of the copper by both flotation and leaching has reached 89.18%.
    Electrochemical Behavior of Chalcopyrite in Sulfuric Acid Leaching
    ZHU Li, ZHANG De-Cheng, LUO Xue-Gang
    2008, 38(05):  66-69+82. 
    Asbtract ( 1776 )  
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    Study is made on the electrochemical behavior of chalcopyrite in sulfuric acid leaching of natural chalcopyrite by three-electrode method. The results indicate that the chalcopyrite is first oxidized into iron-depleted sulfide, which covers the electrode surface and passivates the latter. With the rise in potential, the iron-depleted sulfide continues the oxidation and finally occurs in the solution in form of sulfate radical. When the potential gets smaller than -0.85 V (vs.SCE), the cathodic reduction current of chalcopyrite is larger and the Fe3+ in the crystal lattice is fully dissolved. The strong cathodic reaction of chalcopyrite is of great importance to the oxidation-leaching of chalcopyrite. What's more, with the decrease of pH, H2S formation is accelerated and the peak current of oxidation reduction is increased, indicating that the reduction of pH of the said research system is beneficial to the oxidation of chalcopyrite.
    Research on Properties and Beneficiation Process for Tianbaoshan Copper-Lead-Zinc Polymetallic Ore
    ZHANG Yuan, LIU Tao, ZHANG Jun-Hui
    2008, 38(05):  70-72+142. 
    Asbtract ( 1693 )  
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    Through the investigation on the properties and flotation process of Tianbaoshan copper-lead-zinc polymetallic ore, it is found that the ore has complex association and dissemination. The research results indicate that, if the ore is duly finely ground, good separation indexes can be achieved in either process adopting preferential flotation or that adopting partial bulk flotation. It is also shown that the process adopting preferential flotation is superior to that adopting partial bulk flotation.
    Surface Organic Modification and Characterization of Wollastonite from Hami, Xinjiang
    PANG Gui-Lin, LI Zhi-Juan, ZHEN Wei-Jun, WANG Wen-Jin, CHEN Jin-Jiang
    2008, 38(05):  73-75. 
    Asbtract ( 1904 )  
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    The effect of modifier type and dosage, pulp density, modification time and reaction temperature on the modification of wollastonite from Hami, Xinjiang was investigated. The modified sample was evaluated by methods of settling height, suspension viscosity and activation index. The research indicates that the best modification conditions include a modifier dosage of 1.0%, modification time of 15 min, reaction temperature of 65 ℃, and pulp density of 40%.
    FAAS Continuous Measurement of Potassium, Sodium, Copper, Zinc and Lead in Imported Iron Ore
    BAO Hui-Jun, FU Ran-Ran, ZHANG Ai-Zhen
    2008, 38(05):  76-77. 
    Asbtract ( 1550 )  
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    The separate measurement of potassium, sodium, copper, zinc and lead in the standard analysis method is modified to bulk measurement. High grade imported iron ore sample is dissolved with HCl+HF+HNO3+HClO4, and the contents of the five elements in the iron ore are continuously measured by air-acetylene flame atomic absorption spectrometry method (FAAS), which is accurate, reliable and practically feasible. Flame atomic absorption spectrometry method|Imported iron
    Study on Automatic Classification of Solid Mineral Reserves
    CHEN Guo-Xu, ZHANG Xia-Lin, QI Guang
    2008, 38(05):  78-82. 
    Asbtract ( 1650 )  
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    The full computer-assistance and automation of mineral reserve calculation and classification are the development trend of mineral reserve calculation and are also an important link in promoting the informatization of geological and mineral work and the development of “digital mine”. A rapid accurate automatic classification of mineral reserves is the key to the realization of an automatic and intelligent mineral reserve calculation. In view of this issue and in light of the national classification standard, the automatic classification of mineral reserves is discussed, and its realization process described in combination with a real case.
    Mine Curtain Grouting and Its Effect Testing
    BAI Ju-Bo, XU Bai-Qing, ZHOU Hui-Feng, LI Xian-Bo
    2008, 38(05):  83-85+109. 
    Asbtract ( 1915 )  
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    In light of the real conditions of Zhongguan Iron Mine and learning from the mining experience of Dashui Mine, a domestic similar mine, the design and construction of grouting curtain were carried out in the curtain grouting test. The effect of curtain grouting was tested by a physical exploration method and the analysis of the test results proved the effectiveness of the physical exploration method, which is convenient, rapid, easy and labor-material saving.
    Role of Silicified Alteration Belt in Ore Forming Process of Hexi Gold Deposit
    WANG Zi-Guo, WANG Xiu-Juan, HU Shi-Li
    2008, 38(05):  86-88+92. 
    Asbtract ( 2001 )  
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    It is held through the study of the silicified alteration belt and law of mineralization enrichment that the silicified alteration is similar to a fracture alteration belt, which plays a role of ore-guiding and ore-hosting in the movement of ore-forming solutions. It can provide the channel for ore solution and also the site for ore formation. The guidance significance of silicified alteration and mineralization enrichment to ore prospecting is also discussed.
    Analysis of Prospecting Potentiality of Main Metallic Minerals in Helongjiang Province
    SHUANG Bao, TIAN Shi-Liang, LI Shou-Yi, ZHANG Ting-Ting
    2008, 38(05):  89-92. 
    Asbtract ( 1434 )  
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    The dominant metallic minerals in Helongjiang includes gold, copper, lead-zinc(silver), Molybdenum and iron ones, where there are good geological conditions and great potentiality for their metallogenesis . Based on the discussion on Helongjiang's geological background for metallogenesis, the space distribution of the metallic minerals in the main metallogenic belts, and geological conditions for and potentiality of metallogenesis are studied in depth. The metallogenic features and ore prospecting potentiality of Mesozoic magmatite activity are analyzed and the ore prospecting targets of the main metallic mineral resources in Helongjiang are indicated.
    Application of Vertical Spiral Agitating Mill in Iron Ore Regrinding
    ZHANG Guo-Wang, LI Zi-Qiang, LI Xiao-Dong, ZHAO Xiang, XIAO Shou-Xiao, GAO Xiang-Hai, XIE Jia-Wen
    2008, 38(05):  93-95+134. 
    Asbtract ( 1854 )  
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    The paper describes the basic structure and working principles of vertical spiral agitating mill, and highlights its application in the regrinding and re-separation process of iron concentrate. The industrial application has proven that vertical spiral agitating mill is regrinding and fine grinding equipment of excellent performance. The tailings of Hunan Zhizhuyuan non-ferrous metal ore was ground by JM 800B vertical spiral agitating mill to -38 μm 95.10%, and treated by one roughing-two cleaning magnetic separation. An iron concentrate grading 65.20% was obtained, effectively recovering the iron ore resource.
    Progress in Research on Bimetal Compound Casting Technology for Crusher Head
    LI Peng-Zhi, XING Shu-Ming
    2008, 38(05):  96-99. 
    Asbtract ( 1597 )  
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    The paper describes the present conventional process of bimetal compound casting technology and their merits and defects, and on this basis, analyses the trend and progress in the research of the bimetal compound casting for crusher head. It is considered that bimetal compound casting technology is an effective means for improving the integral performance of crusher head, and disperse imbedding and theological compound represent the development orientation of compound hammer head. Correspondingly, the study of compound criteria, material compatibility and interface integration will be the major points of the research.
    Analysis of Factors Influencing Fluorite Flotation by Cyclonic Static Micro-Bubble Flotation Column
    CHEN Wen-Sheng, LIU Jiong-Tian, LI Xiao-Bing, CAO Yi-Jun, WANG Yong-Tian
    2008, 38(05):  100-102+112. 
    Asbtract ( 1556 )  
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    Cyclonic-static micro bubble flotation column is a highly effective micro particle separation equipment. It integrates counter-current mineralization, cyclonic mineralization and pip flow mineralization to realize an efficient mineralization so as to improve the recovery capability. When it is used in mineral separation, the factors influencing the separation performance are many, including grind size, pulp concentration, pulp temperature, agent regime, water quality, flotation flowsheet and its own working parameters.  For low grade refractory fluorite ore, a plexiglas φ50mm lab  cyclonic-static micro bubble flotation column was used in the separation. The effect of pulp conditioning time, feed rate, circulation pump pressure, aeration rate and spraying water rate on the flotation results of the fluorite ore is discussed.
    Research on Primary Closed-Circuit Grinding-Classification Using Hydrocyclone and Grate Type Ball Mill
    BAI Zhen-He, HE Fang-Wei, LI Shi-Guo, WU Xiao-Yuan, CHEN Zhong-Ji
    2008, 38(05):  103-105+109. 
    Asbtract ( 2139 )  
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    Hydrocyclone, as a new efficient separation device, has wide application prospect. In mining industry, many concentrators have begun to use hydrocyclones in the primary closed-circuit grinding-classification operation. However, the combination of grate-type ball mill and hydrocyclone in the primary classification operation has not seen successful application. The paper describes the industrial test and results of the primary closed-circuit grinding-classification operation using hydrocyclone and grate type ball mill. The practice shows that this grinding-classification system has achieved remarkable improvement in overflow fineness, classification efficiency, circulation load and grinding efficiency.
    Experiment Research on Copper Ore Flotation by Packed Flotation Machine
    XIE Chao-Xue
    2008, 38(05):  108-109. 
    Asbtract ( 1663 )  
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    Packed flotation machine is a new type one formed by packing stainless steel corrugated plates in a common flotation machine. To investigate its adaptability, experiment was made on the floatability of various types of ore samples. The copper ore flotation by the packed flotation machine is mainly described in the paper. The result indicates that it is not only feasible to use packed flotation machine for the processing of copper ore, but also its recovery is better than that by common flotation machines.
    Application of AC-DC-AC 4-Quadrant Variable-Frequency Speed-Regulation System in Inclined Shaft Hoisting
    XIA Jing-Jing, WU Xiao-Jie, WANG Guang-Wu, WU Wei, ZUO Dong-Sheng, CAO Fen
    2008, 38(05):  110-112. 
    Asbtract ( 1598 )  
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    With the development of China's economy, the output increase, energy consumption decrease and performance improvement of coal mines have been put on the important place and the equipment transformation for energy conservation has also become imperative. In view of the features of inclined shaft hoisting, AC-DC-AC 4-quadrant variable-frequency speed-regulation system with energy feedback unit for the hoisting in inclined shaft is developed. The paper describes the composition and control principle of the hoisting system and analyzes the operational performance and research and spreading significance of the speed regulation system in light of its site application.
    Application of Struts Framework in Developing Mineral Resource Information System
    TANG Xiao, ZHOU Ting-Gang, HE Zhong-Yuan, LONG Jun
    2008, 38(05):  113-116. 
    Asbtract ( 1584 )  
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    Struts is a MVC Model2 based development framework for Web applications and can realize the separation of page representation and business logic. The paper describes the internal correlation among the functional modules of Controller, Model and View and their processing process and the design and realization of the mineral resource information system. In this design, the display logic, application logic and processing logic are effectively separated.
    Application of 3D Surfer in Modeling and Visualization of Geological Body's Attributes
    WANG Jun-Hu, YANG Feng-Jie
    2008, 38(05):  117-119+124. 
    Asbtract ( 1890 )  
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    The establishment of 3D model of geological body attributes is one of the key techniques in 3D geological modeling. Based on the study of the main functions and features of 3D Surfer visualization software, the paper describes the application of 3D Surfer in modeling and visualization of geological body's attributes with the data of several attributes of the geological object as example, and demonstrates the technical superiority and application prospect of  3D Surfer in modeling geological body's attributes.
    Study and Application of Scientific Computing Visualization in Deposit Mathematic Modeling
    HE Chang-Sheng, GE Wen-Jie, MIAO Ming-Yi
    2008, 38(05):  120-124. 
    Asbtract ( 1487 )  
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    Visualization in scientific computing is an important content in digital mine and is a new research orientation rising in recent years. In mining field, three-dimensional wireframe model is widely used presently to express the geometric characteristics and occurrence status of geological entities and the modeling methods are different depending on the types and formation causes of geological entities. After the description of the basic principles of modeling, the paper, in light of the geological entities of different types, the paper uses irregular triangulation structure and linear octree coding, in combination with a real case, to establish the landform surface model, orebody wireframe model and tunneling engineering model of the mine, which can well reflect the real form of the geological entities and play an important role in guiding the mining production.
    Application of Microseismic Technique in Monitoring Ground Pressure in Deep Mines
    LIU Jian-Po, LI Yuan-Hui, ZHAO Xing-Dong, ZHANG Jian-Yong
    2008, 38(05):  125-128. 
    Asbtract ( 2019 )  
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    In view of the present frequent deep ground pressure activities in Hongtoushan Copper Mine, mine microseismic monitoring system was established in the mine for continuous real-time monitoring of deep ground pressure activity. The paper describes the selection of the monitoring area and the optimization of sensor layout. The systematic analysis was made of the identification of microseismic signal and it is found thorough the analysis of the monitoring data that microseismic events and blasting events can be well differentiated in accordance with the energy magnitude and wave form; the location results of microseismic events can directly reflect the change of the fissures in rockmass; the rising tendency of microseismic event frequency indicates gradually enhanced ground pressure activity. The monitoring system can timely capture the information of microseismic activity caused by ground pressure and realize the location of microseismic source, which is of great practical significance to the research on the prediction of mine dynamic disasters.
    Effects of Mining on Water Resources and Food Security in  Overlapped Areas of Mineral and Crop Production
    WEI Xiu-Ju, HU Zhen-Qi, FU Mei-Chen
    2008, 38(05):  129-134. 
    Asbtract ( 1594 )  
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    Facing the increasing pressure of population, food and environment, the security of the water resources and food in overlapped areas of mineral and crop production has become a major regional or even national safety issue. The paper, based on the analysis of the mining effects on the water resource and food sicurity, reviews the main content and progress in the study of the water resources and food in overlapped areas of mineral and crop production. It is held that the overlapped area is now not regarded as a large system with mutually coordinated regional society, economy and nature in the study of its water resource and grain sicurity and insufficient work has been done on a systematic study. Especially, the mineral production factors influencing the security of the food area are not fully considered. A systematic study is required on the influencing law of the water resource in mining area, the agricultural water demand for grain sicurity and the optimized configuration of the agricultural water resources in the area, which is also the main orientation for the future research of the water resources and food security in overlapped areas of mineral and crop production.
    Effect of BSA on Adsorption Equilibrium of Cd(Ⅱ) onto δ-MnO2
    ZHANG Li-Na, MA Zi-Chuan, LIU Jing-Ze, CAI Ai-Jun
    2008, 38(05):  135-138. 
    Asbtract ( 1752 )  
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    The effect of BSA on the adsorption equilibrium of Cd(Ⅱ)onto δ-MnO2 is studied. The results show that in the presence of BSA, the adsorption-pH curve of Cd(Ⅱ) onto δ-MnO2 is of S-shape. BSA enables the Cd(Ⅱ) adsorption to leap toward higher pH direction and its adsorption amount decreases with the increase of ionic strength. In the presence of BSA at a pH lower than 3.0, the Cd(Ⅱ) adsorption isotherm follows Langmuir equation but the Cd(Ⅱ) saturated adsorption amount is reduced from 34.97 mg/g to 22.83 mg/g. When pH = 5.0, the Cd(Ⅱ) adsorption is little influenced by BSA. When pH = 2.0 and pH=3.0 and BSA concentration is lower than 20 mg/L, the Cd(Ⅱ) adsorption is evidently reduced with the increase of BSA concentration. When BSA concentration is greater than 20 mg/L, the Cd(Ⅱ) adsorption is hardly reduced. The study helps increase the understanding of Cd(Ⅱ)'s environmental chemical behavior.
    Effect of TiO2 and Cr2O3 Addition on Crystallization of Nickel Slag Glass-Ceramics
    WANG Ya-Li, NI Wen, ZHANG Jin-Rui, MA Ming-Sheng, LIU Feng-Mei
    2008, 38(05):  139-142. 
    Asbtract ( 1794 )  
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    The effect of TiO2 and Cr2O3 addition on crystallization of nickel slag glass-ceramics is studied by XRD, SEM and EDS methods. The result indicates that, when composite nucleating agent TiO2 + Cr2O3 is added, nickel slag glass-ceramics will, after heat treatment, produce phase crystallization to form calcium-rich phase and silicon-rich phase, where spinel type crystal Mg2TiO4 is the first to precipitate, and the diffraction peak of common pyroxene crystal Ca(Mg, Al, Ti)2O6 also occurs. TiO2 does not directly form crystal nucleus but promotes the formation of the spinel type crystal Mg2TiO4, facilitating the crystal growth.
    Tailing Re-concentration Test and Preliminary Practice in Dahongshan Iron Mine 's 4 million t/a Concentrator
    SHEN Li-Yi
    2008, 38(05):  143-145+148. 
    Asbtract ( 1643 )  
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    Based on the study of the tailing properties of KunSteel's Dahongshan Iron Concentrator, small--scale test was made to recovery the iron minerals from the tailings by SLon-2000mm vertical ring pulsating high gradient high intensity magnetic separators in a process consisting of one roughing and one cleaning, which achieved good technical and economic results.
    Investigation and Application of Magnetization-Roasting Process for Iron Separation from Pyrite Cinder
    DONG Feng-Zhi, YAO De, SUN Yong-Feng
    2008, 38(05):  146-148. 
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    Investigation was made on the magnetization-roasting process for recovering iron from pyrite cinder. At a roasting temperature of 800 ℃, roasting time of 15 min, and carburizing rate of 7%, the magnetization effect was ideal. An iron concentrate grading 65.03% at a recovery of 83.54% and yield of 67.60% could be obtained by one-stage grinding and three stage magnetic separation. In the test production line adopting the magnetization-roasting process, an iron concentrate grading 64.71% at a recovery of 86.85% and yield of 70.92% and containing 0.23% sulfur was obtained. The per-ton processing cost of concentrate was about RMB 110, very obvious economic benefit.
    Experiment Research on Factors Influencing Tailing Pulp Flocculation Settling
    WANG Xing, QU Yuan-Yuan, HU Wei-Wei, HAN Wen-Liang, WU Miao
    2008, 38(05):  149-151+153. 
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    Factors influencing the pulp settling property was investigated on the tailings of a mine. The effect of the flocculant kind, pulp concentration and agent dosage on the settling speed was studied in the flocculation settling test. The content of the suspended substance in the upper layer and the liquid-solid compression ratio of the bottom layer were measured. The test results indicate that high molecular flocculants play a role of accelerating the particle settling, and the settling rate is decreased with the increase of pulp concentration and increased with the increase of agent dosage. At a pulp concentration of below 15%, the liquid-solid compression ratio can be over 50%. This experimental conclusion is of direct guidance significance to the tailing thickening by high capacity thickeners in concentrators.