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Table of Content

    15 July 2008, Volume 38 Issue 07
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    FEM-Based Inversion Analysis of In-Situ Stress Field of Zijinshan Gold-Copper Mining Area
    LI Chang-Hong, ZHANG Yong, CAI Mei-Feng, GUAN Jin-Long, ZHENG Ben-Wei, LI Liang
    2008, 38(07):  1-4+18. 
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    In light of the practically measured data of the in-situ stress in Zijinshan gold-copper mining area and its geological structural conditions, a multielement regression model was established by using finite element method.The regression coefficients were obtained by the stepwise regression of the practically measured ground stress values, which were used to accurately inverse the in-situ stress field of the mining area and to find its distribution regularity in this mining area.It is of important significance to the study of the open pit slope stability, underground mining method and mining sequence in open-pit and underground combined mining.
    Selection of Metallic Mine's Expansion Scheme by Ideal-Point Method
    ZHENG Ming-Gui, CAI Si-Jing
    2008, 38(07):  5-8. 
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    The selection of metallic mine expansion scheme is directly related to the mine future economic benefit of production.Therefore, the expansion scheme selection and optimization is of important and far-reaching significance to mining enterprises.Based on the basic principles of the expansion scheme selection for metallic mines, and in light of the production status of a sample mine, an evaluation indexing system for design schemes was constructed.An optimal expansion scheme for the sample mine under a production scale of 5 000 t/d was selected by ideal-point method and then optimized, and its financial indexes were analyzed, providing a reference to the decision-making people in mine expansion.
    Composite Elastic Modulus of Anchored Rockmass
    FANG Cong-Yan, ZHANG Lei
    2008, 38(07):  9-11+26. 
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    The physical and mechanical effects of rockmass anchoring are very obvious.The rockmass strengthened by full length grouted bolt is regarded as a composite body and according to its deformation characteristics when it is stressed，the composite elastic modulus along bolt axial direction and vertical to the bolt axle is deduced by elastic mechanical theory，which is compared with the result obtained by numerical analysis.On this basis，a practical simplified algorithm is given.
    Study on Rational Thickness of Reservation Layer in Open Pit-Underground Combined Mining System
    XU Chuan-Hua, REN Qing-Wen
    2008, 38(07):  12-14. 
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    With the present increasing demand on mineral resources，enhancing mining strength and decreasing shallow resources，open-pit mines are going towards the depth and transiting to the underground mining，with many foreign and domestic mines now being in the open-pit and underground combined mining status.Therefore，how to determine the thickness of the reservation layer in such a mining system is an important yet to be solved problem.Using numeric analysis and according to the displacement convergence condition at the same point above the mining room for the same cross section at different roof  positions，the displacement convergence criterion for the rational thickness of the reservation layer in an open-pit and underground combined mining system was established，which was used in the analysis of a large mine，where the safety isolation layer was determined for the system，providing a technical basis for the safety mining.
    Mechanical Characteristics of Rockmass in Damaged Wall Rock Area at High Ground Stress
    ZHEN Hong-Feng, ZHANG Ji-Xun, LIU Zhi-Yuan
    2008, 38(07):  15-18. 
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    Based on the micro-damage mechanical principle，a micro-damage mechanical model for the stability analysis of high ground stress area was established and used in the simulation analysis of the whole process of the wall rock failure.The equivalent models for the wall rock in the damage area before and after its damage were built by adopting the concept of equivalent model.The mechanical property curve obtained from the numerical mechanical experiment was used in the quantitative study of the change regularity of the main mechanical parameters（strength，deformation modulus）of the rock mass in the wall rock excavation fracture zone along with the construction process.The change values of the main mechanical parameters of the rock mass thus obtained has provided a reliable basis for the rock mass stability analysis and the structural design and further defined the partitioning standard for the disturbed areas of the wall rock by the excavation.
    Study on Determination Method for Elastic Modulus of Differently Weathered Rockmass
    WANG Liang-Qing, TANG Hui-Ming, XIA Yuan-You, LI Chang-Dong
    2008, 38(07):  19-21+155. 
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    Determination of the elastic modulus of rockmass is a hot topic of research in both domestic and foreign geotechnical circles.Based on the damage mechanical and sound wave testing methods, and Monte-Carlo technology, the method for estimating the elastic modulus of differently weathered rockmass was theoretically deduced, which was used in the estimation of the elastic modulus of the foundation of the arch dam of Yujianhe Reservoir in Guizhou.The results indicate that, at the preliminary study stage of some large scale projects, when it is needed to make a preliminary judgment for the elastic modulus of rockmass, Monte-Carlo simulation and laboratory test methods can be used to estimate the elastic modulus of differently weathered rockmass.
    Model for Relation between Mineralization Degree and Electrical Conductivity of Leaching Solution
    ZHU Pan-Min, JIAO Xue-Ran, SHI Xiao, SUN Zhan-Xue, SHI Wei-Jun
    2008, 38(07):  22-23+83. 
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    There is correlation between the electrical conductivity and mineralization degree of leaching solution.A model for this relation was established based on the analysis of the data of the electrical conductivity and water chemistry of the leaching solution in the indoor simulation test of in-situ uranium leaching.This model can be used to quickly find the mineralization degree through the electrical conductivity of leaching solution，providing a simple，rapid and accurate method for the next stage real in-situ uranium mining.
    Study on Rock Damage Evolution based on Least Energy Consumption
    YANG Da-Yong, GAO Wei
    2008, 38(07):  24-26. 
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    Taking the isotropic elastic damage of rock as example, a new approach of establishing a damage evolution equation based on the principle of least energy consumption is proposed and the damage evolution equation and critical damage value of rock under uniaxial compression are deduced.
    Key Technical Measures in the Early Period of Transition from Open-pit to Underground Mining
    TIAN Ze-Jun, NAN Shi-Qing , SONG Ai-Dong
    2008, 38(07):  27-29+159. 
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    Presently, most of the iron mines in China have to face the issue of transition from open-pit mining to underground mining.Such transition will involve many technical issues and the most important one is how to realize a steady transition and the production convergence.In light of the main issue in the transition from open-pit mining to underground mining, a series of measures for a steady transition were planned, adopted and achieved ideal effect, including staged construction, increase of in-vein measure shaft（drift）engineering and recovery of residual ore.
    Research on New Process of Vanadium Extraction from Vanadium Containing Stone Coal by Acid Leaching under Oxygen Pressure
    DENG Zhi-Gan, LI Cun-Xiong, WEI Chang, LI Min-Ting, LIANG Yan-Hui, WU Hui-Ling
    2008, 38(07):  30-33+161. 
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    The research on the new process of vanadium extraction from vanadium containing stone coal by acid leaching under oxygen pressure is described.Investigation is made on the effect of the leaching time，leaching temperature，leachant concentration，liquid/solid ratio，ore particle size and additive dosage on the leaching rate.The research result indicates that the vanadium leaching rate can be higher than 90% after two stage acidic leaching under oxygen pressure at a leaching time of 3~4 h，leaching temperature of 150 ℃，sulfuric acid dosage of 25%~30%，liquid/solid mass ratio of 1.2∶1，ore particle size of -200 mesh and additive dosage of 3%~5%.
    Study on Interaction between EPS and Metallic Ions by UV Spectrophotometry
    WANG Li, WEN Jian-Kang, LIU Mei-Lin
    2008, 38(07):  34-37+147. 
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    Bio-hydrometallurgical technology is very efficient for handling poor，complex and fine ores and has advantages that conventional mineral processing and metallurgical methods can't have.Extracellular polymeric substances（EPS）plays a very important role in the extraction of metal ions from sulfide ores in the bio-hydrometallurgical process.Analysis is made of the EPS extracted by sulfuric acid method and the method of formaldehyde plus sodium hydroxide and the function of EPS and metal ions by UV spectrophotometer.The results show that there is only complexation between EPS and Fe3+ ions，thus verifying that it is through the oxidation function of the Fe3+ions in the complex between EPS and Fe3+ ions that EPS enables the metal sulfides to degrade.
    Quality Stability and Tailing Grade Reduction in Concentrator of Qidashan Iron Mine
    SU Xing-Guo, LIU Gui-Yun
    2008, 38(07):  38-42. 
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    The analysis was made of the causes for the grade rise of the flotation tailings of Qidanshan Mine' concentrator and tests were made on reducing the grade of the flotation tailings and improving the metal recovery.The results show that the treatment of the concentrate of high intensity magnetic separation by a process consisting of fine screening，desliming and gravity separation can not only stabilize the flotation performance but also reduce the grade of the flotation tailings.
    Experimental Research on Beneficiation Process for a Limonite Ore
    LU Dong-Fang, ZHANG Ying, ZHOU Yu-Lin, WANG Yu-Hua
    2008, 38(07):  43-45+57. 
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    An iron ore contains limonite and hematite which are its main iron minerals and silicates such as kaolinite which are its main gangue minerals.The ore is very apt to produce slime in the grinding process，leading to a deteriorated beneficiability.Tests are made on the ore by adopting processes including desliming by selective flocculation，magnetic separation，flotation and gravity separation.The test results show that the separation process consisting of enhanced pulp dispersion and high intensity magnetic separation is the most suitable one，which can obtain an iron concentrate grading about 54.12% at a recovery of 62.16% from an iron ore assaying around 37.34% iron，rather  good  metallurgical performances.
    Application of Electrochemical Regulation and Control of Flotation in Meishan Concentrator
    ZHANG Jian-Feng
    2008, 38(07):  46-48+60. 
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    The paper describes the test on the application of DH-1# electrochemical regulator in Meishang Iron Mine.It was found through laboratory test that, for a ROM ore containing 3% sulfur, the suitable conditions for the electrochemical regulation of flotation was 150 g/t DH-1#, 40  g/t ethyl xanthate and 100 g/t 2# oil.On this basis, an industrial test was conducted and obtained a sulfur concentrate grading 39.03% at a sulfur recovery of 78.53% and sulfur tailings grading 0.440%. The application of DH-1# electrochemical regulator in regulating and controlling the flotation can save the dosage of ethyl xanthate used as the collector by over 58%, enabling an annual economic benefit of 3.49 562 million.
    Status Quo of and Suggestions on Technical Process of No. 3 Concentration Workshop in Daguashan Concentrator
    GAO Zhi-Zhe, TANG Xue-Fei, DENG Ben-Xu, ZHENG Jie
    2008, 38(07):  49-53. 
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    Based on the analysis of the ore properties，magnetic characteristics of ROM ore and grinding size characteristics of the feed to No.3 Separation Workshop of Dagushan Concentrator，a systematic analysis is made of  the status quo and the existing problems in the technical flowsheet including the primary grinding and classification，secondary grinding and classification，magnetic separation，primary dewatering tank，secondary magnetic separation，fine screening and re-concentration，concentration before the filtration，and the water supplying system.Measures are then suggested for improving the operation method，the operation process，the equipment for grinding and concentration and the concentrate grade.
    Study on Bioleaching of Low Grade Phosphate Ore
    LIU Jun, GONG Wen-Qi, SHEN Qiu-Shi, WANG En-Wen
    2008, 38(07):  54-57. 
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    It has become increasingly more difficult to recover low grade phosphate ores by traditional mineral processing methods while bioleaching process has been increasingly more widely used in wet metallurgy field thanks to its features of economics and environmental friendliness.However, bioleaching is little used in processing phosphate ores both in and outside China.In this study, strains of acidithiobaciilus thiooxidans and acidithiobacillus ferrooxidans were collected from the acid drainage of a coal mine in Anhui Province.Ultraviolet irradiation and Microwave inducement were applied to the bacterial cultivation of strains of Acidithiobacillus that can produce more sulfuric acid.The leaching of low grade phosphate ore from Zhongxiang, Hubei, China by the mutagenic microbe can achieve better leaching effect and the addition of Tween series surfactants to the bioleaching process can further improve the phosphorous leaching rate.
    Parameter Optimization of Secondary Hydrocyclones in Qidashan Iron Mine's Concentrator
    GAO Tai, XU Xiao-Ge, ZHANG Guo-Qing
    2008, 38(07):  58-60. 
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    The combination of overflow type ball mills and hydrocyclones is used the primary and secondary closed-circuit grinding process in Qidashan Iron Mine's Concentrator, Mining Co.of AnSteel Group.Since it was put into operation, the classification efficiency of the secondary grinding had been low, restricting the downstream concentration operation.The comparison of domestic FX660-GX hydrocyclones with imported Krebs hydroclones and the optimization of the hydrocyclone parameters were then made.The results show that the hydrocyclones with 180 mm overflow tube and 135 mm underflow spigot can satisfy the site process requirements and have good classification effect.
    Processing of Bameng Magnesite Ore by Carbonization Method
    YI Xiao-Xiang, YANG Da-Bing, LI Ya-Wei
    2008, 38(07):  61-63. 
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    Carbonization method was used to process Bameng Magnesite ore.The light-burned magnesia produced by calcination was hydrated，carbonized，leached and calcined.As a result，a highly pure active product having an MgO grade of higher than 99.41% and an MgO recovery of  61.34% was obtained.The best process conditions include：a calcination temperature of 800 ℃，light-burning time of 2.5 h，vibrating grinding time of 2.5 min，hydration time of 30 min，Mg（HCO3)2  liquid temperature of 150 ℃，CO2 aeration volume of 8 L/min，aeration time of 3 min，solid/liquid ratio of 60∶1 and pH value of 7.0 for the secondary carbonation.
    Characteristics of Iron Ore Resources in Anshan Region and Suggestions on Their Exploitation and Utilization
    WANG Zhong-Hong, CHEN Qiang, LIU Hua-Yan
    2008, 38(07):  64-66. 
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    The paper describes the iron ore resources and the mineral composition of the iron ores in Anshan regions，analyzes their process mineralogical characteristics in terms of ore texture，structure and dissemination grain size，and makes suggestions on how to efficiently exploit the iron ore resources in Anshan region.
    Discussion on Particle Size Index of Imported Iron Ore
    YUAN Xiao-Ying, SUN Can
    2008, 38(07):  67-69+151. 
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    The imported iron ore quantity has been increased rapidly in recent years and the particle size which is one of the quality indexes of imported iron ore has been paid great attention to by both parties in the trade.The paper describes the importance of the particle size index of iron ore and points out some issues that are worth notice in the iron ore size inspection.
    Geological Features of Silver-Lead-Zinc Polymetallic Deposits in Southeast Section of Daxinanling—with Lamahan deposit as the case
    LI De-Ting, ZENG Qing-Dong, LIU Jian-Ming, LIU Hong-Tao
    2008, 38(07):  70-73. 
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    The geological features，ore-formation conditions and ore-controlling factors of Lamahan Ag-Pb-Zn polymetallic deposit were identified.Several geophysical regional survey and depth sounding techniques were used in detailed 3D geophysical exploration of mineralized veins and forecasted areas to find the spatial distribution law and scale of mineralized geological bodies.The ore-formation law and geological ore prospecting indicators in this area were summarized and ore-forming and ore prospecting models were established，which are of important significance to guiding the regional prospecting.The geophysical exploration results were verified by small amount of surface and depth engineering and the resource prospect of this area was evaluated.
    Multivariate Statistical Analyses of Chemical Elements of Drill Holes in Guangxi Dachang Ore Field
    YANG Xiao-Kun, QIN De-Xian, FENG Mei-Li
    2008, 38(07):  74-76. 
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    The complexity and diversity of ore forming are common to mineral resources, the difficulty in whose research is the evolution of the ore forming process.The multivariate statistical analysis of geochemical elements can be used to deduce their evolution characteristics in complex ore forming process so as to provide valuable micro information for ore prospecting.Cluster analysis of the relevant elements of drill holes in Guangxi Dachang ore field was made.The factor analysis revealed the complex and superposed mineralizations in the ore formation in this ore field.The enrichment of Zn and Sn is closely related to multi-metal elements and has no direct relation with elements such as Au.Sb, Pb, Ag and Cu can be used as the indicating elements for ore prospecting.
    Geological Characteristics and Prospecting Orientation of East Area in Chifeng Huangjiayingzi Copper Deposit
    ZHANG Zuo-Lun, ZENG Qing-Dong, YU Chang-Ming, YE Jie, LIU Jian-Ming, LIU Hong-Tao, LI De-Ting, QIN Feng, CHEN Wei-Jun
    2008, 38(07):  77-79. 
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    In order to understand the mineralization prospect of the east area of Huangjiayingzi copper deposit and guide the further ore prospecting work, detailed geological investigation was made in the target area.It was found that the known surface ore vein was evidently controlled by faulted structure.This surface exploratory trench controlled more than 20meters.To further know the vein downward extension, we tried to use high resolution EH4 electromagnetic image system to analyze the deep geological structure and mineral abnormalities.It can be seen from the EH4 electromagnetic sounding sectional map that the ore-controlling fault has extended downward for about over 400 meters but the abnormalities are discontinuous.The comprehensive research indicates that this mineral occurrence has very good ore occurrence conditions, but the mineralization intensity has to be further verified.The effectiveness of analyzing the geological structure at depth by EH4 electromagnetic imaging system is thus verified.
    Au-Ag Relativity of Altered Rocks and Its Application in Resource Evaluation
    GAO Bang-Fei, ZHOU Ying-Chun, GUO Chun-Ying
    2008, 38(07):  80-83. 
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    The statistical results of typical Au, Ag deposits reveal that the relativity between gold and silver elements（RGSE）of altered rocks plays a role of indicating the mineralization type of deposit.When RGSE is high, both Au and Ag can have a content required for economic ore bodies while RGSE is low, only Au or Ag can be of economic significance.The theoretical and practical analysis indicates that the differentiation of Au from Ag may result from their difference in geochemical properties, primary rock formation characteristics and the origin and evolution of the hydrothermal fluids.RGSE can better reveal the superposition of multi-phases of mineralized fluids than Au/Ag ratio.It is of guidance significance to the application of RGSE to infer the potential mineralization type of deposits, to the exploration for reserve expansion of the existing mines and to the resource comprehensive utilization.
    Iron Ore Formation Mode and Law and Prospecting Indicators of Zhonggu Ore Field
    GAO Dao-Ming, HONG Dong-Liang
    2008, 38(07):  84-87. 
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    Zhonggu ore field is one of important ore concentration areas in Nanjing-Wuhu region.Based on the previous work and research，through the analysis of the geological background of ore formation and geological characteristics of various types of deposits，the paper summarizes the ore formation laws such as “three floor three types in five modes” and fenster -channel -grouping -complementation -three-storied building”，and the ore prospecting indicators including rich alkaline rich iron，high oxidation and low magnesium magmatic rock，calcium-containing shale，limestone of Trias and gypsolyte stratum and gravity- magnetic abnormal combination，which are of certain reference and guidance significance to the new round of iron ore exploration.
    Study on Constructing TIN for Calculating Cut & Fill Earthwork Volume
    YANG You-Chang, JING Ni
    2008, 38(07):  88-91. 
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    To improve the accuracy of cut & fill earthwork volume calculation，triangulate irregular network（TIN）was adopted to build the design model and real model.　In the earthwork volume calculation by means of primary construction of TIN model，it was difficult to realize the calculation by computer as the model was complex at the division boundary between the cut and fill earthwork.To solve it，secondary TIN construction was conducted to simplify the calculation mode by solving vector triangle calculation so as to facilitate the automatic realization by computer.The method and specific procedure for cut & fill earthwork volume by twice construction of TIN and the mathematical models used in the calculation are described.
    Study on Establishing Non-Laminated Orebody Block Model by 3D Common Kriging Interpolation
    LIU Ya-Jing, LI Mei, YAO Ji-Ming
    2008, 38(07):  92-95+99. 
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    In view of the characteristics of great technical difficulty and complex structure of the study of 3D spatial data interpolation method, by taking advantage of the theoretical and practical experience provided in the long term development of the existing 2D spatial data interpolation, and on the theoretical base of geostatistics, detailed study is made on the key steps in 3D common Kriging block interpolation method.Meanwhile, the key techniques and main methods in establishing non-laminated orebody block model are presented.In light of the problem of data search of information points in interpolation process, an elliptical sector search method for real 3D space is proposed, making the calculation results more accurate.Finally, visualization software for block modeling is developed from the bottom layer, which has been verified in a mine and can be of certain guidance significance to the modeling of non-laminated orebody and orebody reserve calculation.
    Packing in Column Flotation and Its Industrial Application
    ZHANG Min, LIU Jiong-Tian
    2008, 38(07):  96-99. 
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    Packing is one of the most effective ways to raise the flotation column efficiency and reduce the column height.The paper points out the difference between fillings packing and sieve plate packing, and the defects of filling packing of flotation column in industrial application, and analyzes the change of the flotation environment and the effect on the flotation results made by these two packing modes.Based on sieve plate packing, optimized packing was made on the flotation section in cyclonic static micro bubble flotation column, and a mixed packing mode using both sieve plates and honeycomb tubes was proposed.This mode is characterized by using honeycomb tube to reduce whirlpool and reduce the radial dispersion of jetted bubbles, and using sieve plates to continuously divide the bubbles so as to prolong the bubble route and stabilize the froth layer.The application of this mixed packing mode in the beneficiation industrial test of cyclonic static micro bubble flotation column enabled the depression of large whirlpool at the column bottom, a uniform radial dispersion of bubbles, and the prolonging of pulp residence time, hereby evidently improving the separation process and performance.
    Application of Magnetic Separation Column in Benxi Iron & Steel Group's Concentrator
    ZHOU Ling-Jia, ZHAO Tong-Lin, CHEN Zhong-Hang, LIU De-Xu
    2008, 38(07):  100-102. 
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    In the iron increase and silicon decrease project of Benxi Iron & Steel Co.，magnetic separation columns were successfully used in BenSteel's two large concentrators，Nanfeng and Waitoushan，helping realize the goal of a final iron concentrate containing over 68.5% iron and below 4.5% silicon.The practice shows that the magnetic separation column can effectively remove the intergrowths and free gangue particles in magnetic agglomerations and is the first choice equipment for obtaining a high grade concentrate in the “iron increase and silicon decrease” project.
    Application of Nuclear Physical Beneficiation Technology
    GUO Tie-Liang
    2008, 38(07):  103-104+107. 
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    With the absorption method in nuclear physical mineral processing as the case, and based on the description of the separation equipment, the paper discusses the technological process on its separation principle.The application of nuclear beneficiation technology is presented, including the feeding system, irradiation system, detection system and separation system.
    Development and Application of LJK Combined Type Tramp Iron Remover for Magnetic Ores
    TANG Qi, ZHANG Yi
    2008, 38(07):  105-107. 
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    The paper describes the design principle，main unit structure，operation process，main features and application of LJK combined type tramp iron remover for magnetic ores.LJK combined type tramp iron remover for magnetic ores has the advantages of automatic supervision and automatic iron removal，little ore attachment and no tram iron missing and therefore，has wide application prospect.
    Numerical Simulation of Work State of Large Hydrostatic Bearing
    FENG Su-Li, LI Zhi-Bo, SONG Lian-Guo, LIU Gang
    2008, 38(07):  108-111. 
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    A finite element model for hydrostatic bearing is established by solving the simplified N-S equation by finite element method.The pressure and flow rate needed in the oil chamber for satisfying the bearing capacity is calculated by APDL and the distribution law of the pressure and velocity of the lubrication oil passing through the bearing is found.Based on this，the relation between the influencing factors such as the deviation angle of oil chamber，radius gap and oil viscosity，and the flow rate and the bearing capacity of oil film is analyzed，providing a basis for the design of the oil supply system of hydraulic bearing.
    Wear Resistance Test of Ultra-high Molecular Weight Polyethylene and Its Application
    ZHANG Chun-Yang, CAO Ping, WU Feng-Feng, WAN Lin-Hui
    2008, 38(07):  112-113+123. 
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    There is often ore plug and wall adhesion in ore discharging from the ore bin to the vehicles，which can seriously affect the ore loading and transport efficiency.Manual handling has high hidden danger of safety.Ultra-high molecular weight polyethylene has fine mechanical property and stability.The wear resistance test and the spot test have proven its feasibility of being used as the internal wall lining of ore bin.
    Application of A New Type of Ball Bearing to the Autogenous Mills
    XIE Li, LIU Zhen-Dong, ZHENG Shu-Gang
    2008, 38(07):  114-115. 
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    With help of the patent of 200710065224.0, the single-row spherical ball bearing being suitable for autogenous mill was successfully produced. This bearing has adopted an integrate structure in feed end and a forming structure in discharge port. The inner and outer lane of bearing used GCr15SiMn, and the ball body put to use the excellent G20Cr2Ni4A carburizing bearing steel. Compared with the present technique, this ball bearing consumed less energy at overcoming friction with power saving of 10% to 15%. After application of ball bearing to Φ5500×1800mm autogenous mill, the highest temperature in feed end of integrate bearing is about 10℃, and the temperature in discharge port about 20℃ with good effects on energy savings.
    Comparison between Domestic and Foreign Dust Monitoring Techniques
    TIAN Dong-Mei, JIANG Zhong-An, YAO Jian, NIU Wei
    2008, 38(07):  116-119. 
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    The dust monitoring significance is pointed out through the analysis of dust hazards and the progress in both domestic and foreign research on dust monitoring techniques is discussed.Comparison is made between China and foreign developed countries in relation to the implementation of laws and regulations, accuracy and innovation of monitoring instruments, and measures for monitoring, prevention and control of dust and main gaps are found out.The development orientation for China's future dust monitoring technical field is pointed out.
    Progress in Research on and Mechanism of Phytoremediation for Heavy Metal-Polluted Soil
    YANG Xiu-Min, HU Zhen-Qi, HU Gui-Juan, YANG Xiu-Hong, LI Ning
    2008, 38(07):  120-123. 
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    Soil pollution is a globally urgent environment problem.Phytoremediation is an ecological technology developed in recent years and used mainly for removing the heavy metal pollution in soil.The paper describes the method and mechanism of phytoremediation and discusses its future application.
    Study on Acoustic Emission Quietude-Omen Characteristic of Failure of Compressed Rock
    YIN Xian-Gang, LI Shu-Lin
    2008, 38(07):  124-128. 
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    Through indoor rock loading method, mechanical characteristics of acoustic emission properties of different rocks in their whole failure process are tested; the mechanical characteristics of the whole rock failure process are obtained, including the relevant curves and parameters such as whole stress-strain curves, number of acoustic emission events and acoustic emission event rate; and the relationships of the number and rate of acoustic emission event with the stress level and time are studied.The stress is laid on the decrease of stress increment in unit time when the stress strength is near to its peak value in one-time loading on non-brittle rock an evident time-consuming phenomenon occurs in this stage.In addition, the rate of the acoustic emission event monitored in this stage decreases obviously and acoustic emission quietude occurs.However, for brittle rocks, there is basically neither evident “time-consuming” phenomenon nor relative acoustic emission quietude in this stage.Combining with the indoor test, some issues in the monitoring of the acoustic emission in in-situ rockmass failure are summarized and analyzed, hereby providing a theoretical basis, method and means for the field monitoring and forecast of rockmass stability by means of acoustic emission.
    Experimental Research on Destruction Portent of Post-High Temperature Sandstone
    WAN Guo-Xiang, LI Xi-Bing, YIN Tu-Bing
    2008, 38(07):  129-131. 
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    Impact experiments of post-high temperature sandstone were made on SHPB test system and the curves of stress-strain were obtained.The test results show that the dynamic strength of sandstone under impact decreases with the temperature rise.The parameters were fitted by the theory of accelerating energy release（AER）forecasting the macro destruction portent of rock and the parameters value representing the AER degree were all below one, indicating that the elastic strain energy is in accelerated energy release before the final destruction of the rock sample.The parameter z increased with the temperature rise, indicating that the AER before the rock destruction decreases with the rise of temperature.This research has further improved and developed AER theory and is the first time to adopt AER theory to reveal the energy release characteristics before destruction of post-high temperature rock sample under impact.
    Experiment Research on Acoustic Emission Characteristics of Burst-Prone Rocks
    YUAN Zi-Qing, TANG Li-Zhong, YANG Xiao-Cong
    2008, 38(07):  132-135. 
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    Through the acoustic emission（AE）experiments on the failure process of burst-prone quartzitic diorites under one-cycle loading and unloading condition, the characteristics of spectrum of AE signal and the relations among AE counts, energy, AE rate, energy rate, strain and time were studied.The results show that the rock experiences an initial consolidation stage and a non- elastic stage.The acoustic activity is stronger under unloading than under initial loading condition and the unloading further promotes the instable deformation.Before the deformation, AE rate and energy rate sharply increase and in the loading-unloading-loading process, the main frequency of acoustic activity develops in a process of low frequency, medium frequency, high frequency and then sub-high frequency, which can be reference to the rock-burst prediction for this type of rockmass.
    Modification of Organic Betonite and Its Application in Biological Waste Water Treatment
    LI Zhi-Juan, PANG Gui-Lin
    2008, 38(07):  136-139. 
    Asbtract ( 1937 )  
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    With Xinjiang Wulanlinge bentonite as the raw material，a series of anionic and cationic organic betonites were prepared by adding anionic and cationic surfactants.The raw betonite and the organic betonites were characterized by XRD，SEM and viscosity.The XRD results show that after the modification，the spacing between montomorillonite layers is increased from 1.337 nm to 2.538 nm; and the SEM results indicate that the anionic and cationic surfactants have penetrated in between montomorillonite layers.Anionic and cationic organic betonite was used as absorbent to remove glutamic acid in the biological waste water treatment.When pH = 5.6 and the dosage of anionic and cationic organic betonite is 2 g/L，the removal rate of glutamic acid can reach 40.09%.
    Comparison and Reference of Transformation Policies of Domestic and Foreign Mining Cities
    LUO Zhi-Hong, ZHU Qing
    2008, 38(07):  140-143. 
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    The paper analyzes the difficult situation faced by China's mining cities in their transforming process from their economic structure, environment, employment and social security, describes the experience of foreign mining cities in their transformation such as Houston, USA and Ruhr, Germany, and makes beneficial some suggestions on the formulation of the policies relating to investment, financing, taxation, talents and environment.
    Preparation of Multiphase Material from Iron Tailings
    LIU Ming, XU Li-Hua, DI Yun-Ping, ZHANG Xiao-Meng, HAO Hong-Shun
    2008, 38(07):  144-147. 
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    Abstract Fe3Si-Ti(C，N）multiphase material was prepared from the iron tailings of titanium separation in Panzhihua Steel by using active carbon as the reductant and adopting carbothermic process and realizing an integration of synthesis and sintering，hereby exploring a new way to synthesize multiphase material at low cost by using tailings.The phases，microstructure and composition of the sintered product were characterized by means of X ray diffraction（XRD)，scanning electron microscopy（SEM）and energy dispersive spectroscopy（EDS）and the mechanical property of the sample was also studied.XRD result indicates that the main crystal phases of the product are Fe3Si and Ti(C，N).It is known from SEM and EDS results that the resultant Ti(C，N ）phase is enriched around Fe3Si. The bulk density and superficial Rockwell hardness is increased with the temperature rise.When the temperature for synthesis is 1 500 ℃ and the holding time is 4 h，the resultant sintered product has a high bulk density（ρ ＝4.331 g/cm3 ）and high superficial Rockwell hardness（HR15N =85.0)
    Experimental Study on Beneficiation of a Low Grade Refractory Iron Ore from Hebei
    GAN Yong-Gang, SONG Yong-Sheng, LI Wen-Juan
    2008, 38(07):  148-151. 
    Asbtract ( 2027 )  
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    Experiment study was made on the beneficiation of a low grade refractory iron ore from Hebei.The results show that a comprehensive concentrate grading over 60.00% at an iron recovery of 35.00%（a corresponding magnetic iron recovery of 52.47%）can be obtained by a process composed of tailing pre-discarding from ROM ore（-12 mm), two stage grinding and two stage magnetic separation, centralized classification, re-grinding and several cleanings of the roughing concentrates and dewatering, classification, regrinding and re-concentration of the middling. A final iron concentrate grading over 65.00% can be gained through a further classification of the comprehensive concentrate.