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Table of Content

    15 April 2011, Volume 40 Issue 04
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    Key Techniques for Intelligent Drilling in Geotechnical Engineering
    TAN Zhuo-Ying, XIA Kai-Wen
    2011, 40(04):  1-4+20. 
    Asbtract ( 1795 )  
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    Intelligent drilling is the technical basis for the intelligent mine geotechnical engineering, and the prior conditions for information construction of rock and soil engineering.It has an abroad application prospect in fields of mine rock and soil engineering, geotechnical engineering, geological engineering and earth scientific drilling.The major components, key techniques as well as technical bottlenecks of the intelligent drilling, including principal constitution and fundamentals, monitoring in drilling, positioning and navigating of drilling bit, signal transmission, real-time identification and classification of lithizone are introduced.And building the real-time identification and classification theory of intelligent drilling, completing the software and hardware systems of information wire transmission with intelligence drilling, and realizing the continuous monitoring, analysis, evaluation, control and management on stratum and drilling system are the development directions in future.
    Study on the Mining Proposal Selection for Gently Inclined and Extremely Thin Iron Mine
    XU Wen-Bin, SONG Wei-Dong, DU Jian-Hua, TANG Guo-You, LIU Bo-Hua
    2011, 40(04):  5-8. 
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    Based on geological condition of gently inclined and extremely thin iron mine, Hamming distance method is used to choose the primary proposal of mining method; Then considering such mining factors as the safety of mining, economic and technical index, mining efficiency, environmental effect and so on, the model of the index system and analytical hierarchy process which affect mining method choice is established.Both the evaluation matrix among various levels and the weight matrix of different influence factors are also obtained by the AHP method; At last, the Fuzzy decision mathematics model is built.And due to the maximum membership grade principle, the optimal proposal is determined.The research result shows that longwall mining method with hydraulic pressure frame supporting capping rock is the optimal mining proposal for the gently inclined and extremely thin iron mine.
    Study on Large Spacing Structure with Non-pillar Sublevel Caving in Jinshandian Iron Mine
    HUANG Ze, SHENG Jian-Long, LI Xun
    2011, 40(04):  9-11. 
    Asbtract ( 1729 )  
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    Through the contrast experiments, the investigation on large spacing structure of non-pillar sublevel caving in Jinshandian Iron Mine is made to get reasonable parameters for recovering the crestal ore by non-dilution or low dilution.It is best of stopping mining when the mixed rate of gauges is 10% and the recovery rate is the highest.The experimental data shows that when the height of lift with the spacing of passage is 15cm×15cm, the recovery rate is high.Also, the height of crestal residual ore is in accord with the fixed value, which contributes to a good recovery at next sublevel.
    Analysis on the Preferred Structure Plane of Rock Mass and Slope Stability in Infrastructure Construction in Tibet Bangfu Open-pit Mine
    HU Bin, WANG Xin-Gang, LIU Zhi-Quan, YU Ye-Qing, LIU Dai-Tian, YIN Cai-Fu
    2011, 40(04):  12-15. 
    Asbtract ( 2300 )  
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    In view of the stability problem of side slope in construction of Tibet Bangpu Open-pit Mine, the field measurement on the structure plane in tunnel of mining area was firstly made. And the roses diagram, the isodensity map and the perspective projection drawings were got through the statistical analysis of the occurrence of structure plane; Then, combing with the characteristics of landforms, geological structure and the structure plane of side slope in openpit mine, the preferred structure plane which control the stability of side slope was attained-Lastly, the qualitative analysis on the stability of side slope was made by the stereographic projection.
    Investigation on the Deformation and Failure Law of High Steep Slope under Complex Conditions
    TANG Ya-Nan, SONG Wei-Dong, WANG Dong-Xu, CHENG Wen-Wen
    2011, 40(04):  16-20. 
    Asbtract ( 1847 )  
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    The deformation and failure law of the high steep slope at open pit due to the fault was investigated by the simulation tests of similar material with Panzhihua Iron Mine as an example.In the tests, the stress sensors and close-range photogrammetry measurement were adopted to monitor the failure and stress-strain features.A systematic analysis was made on displacement and crack failure of surrounding rock to discover the basic deformation and failure law of the high steep slope.The intensity of fault is weakened by rainfall and burst, and the deformation and failure mainly occurred in upper and middle levels of the wedge formed by the faults.The modeling of similar materials which well discover the basic characteristics of rock mass deformation and failure of high-steep slopes due to the rainfall and burst is an effective solution for theoretical research.
    Application of the Upward Drift Mining and the Upward Cut-and-fill Mining in Liguanji Iron Mine
    HU Dao-Xi
    2011, 40(04):  21-23. 
    Asbtract ( 2083 )  
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    Liguanji Iron Mine belongs to the thick multi-layer steep iron ore deposit, and its bottom lies in the fracture zone.The sublevel open-stoping mining method was primarily adopted.But a serious collapse of footwall wall-rocks happened, and stone rocks were difficult to remove, leading to great deal of loss and dilution and serious security risks as well.After improvement, the upward drift mining method was used in the lower plate of ore deposit, and the upward cut-and-fill mining method was adopted in the upper plate.The span of the top plate was adjusted according to the stability of the ore rocks.The joint exploitation of multi-layer ores lowered the loss and dilution ratio and the cutting engineering quantities, by which the safe and efficient mining with good economic returns were obtained.
    Application of Numerical Simulation in Floor-Heave Treatment of Deep Soft Rock Roadway
    YAN Gao-Feng, GAO Ming-Shi, DU Zhe, LI Jiang-Feng
    2011, 40(04):  24-27+44. 
    Asbtract ( 2000 )  
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    With the increasing of mining depth, the roof-floor lithology of the tunnel shows the characteristics as soft rock, normally resulting in the drift floor-heave.The rational bolt supporting mode should be selected based on the specific conditions to regulate the roof and floor.And the principle is that it can meet all requirements of transportation, ventilation and safety on the basis of saving costs.An optimum scheme is chosen after comparing the result of FLAC simulation.Taking Xinqiao Coal Mine -550 m north flank orbit drift as a case, this paper analyzed the drift floor-heave formation mechanism and proposed several repairing methods.Then, with the simulation of FLAC software, the optimal scheme which can supply the safety in production with the best cost-saving in economic is obtained.The rock burst monitoring verified that the supporting effect is good, and this method and the supporting technique afford the precious experience for managing drift floor-heave in mining areas.
    Study on the Mining Method for Exploiting Marginal Thin Ore Veins in Shouyun Iron Mine
    CHEN Bin, GUO Guang-Xian
    2011, 40(04):  28-31. 
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    The multi-entry bench room mining method has been widely used in exploitation of main hangingwall ore-body in Shouyun Iron Mine.But for exploiting the marginal thin veins, it makes the main public roadway hardly be used, and results in huge caving and mining engineering at bottom and high mining costs as well since the public roadway is far away from the main ore-body.So the single-entry bench room mining is proposed.That is, only one single roadway along the bottom of the thin vein is arranged, which can be used both as undercutting roadway and ore-drawing roadway.This method can reduce the cutting engineering quantities.The actual application proved that the method is superior to any other room mining methods in cost and efficiency of mining.
    Optimization Research on Paste Backfill Drilling System in Huize Lead-zinc Mine
    XIAO Yun-Tao, WU Ai-Xiang, DI Yong-Gang, HUANG Ming-Qing
    2011, 40(04):  32-35. 
    Asbtract ( 1621 )  
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    To minimize the wear of backfilling drills and pipes in a paste filling system, it is analyzed that the impact force caused by the free fall of the pulp at the interface of loop and full flow area is the main form of greatly contributing to the wear of backfilling drills and pipes.Combining with the actual situation of mine, and according to the relationship between hydraulic gradient of the running piping and the full flow, two schemes of variable diameter for resistance-increasing are proposed, including a reductive modification of horizontal pipeline from diameter 150mm to 85mm partly and a newly bilayer structure drill model by vertical drills.In addition, a trial was carried out to test the feasibility of modification of horizontal pipeline.The results showed that the full piping rates were increased from 3.6% to 39.42%.
    Stability Classification of Rock Mass in Jiaojia Gold Mine Based on AHP and Fuzzy Comprehension Evaluation
    YANG Jian, WANG Xin-Min, LI Jie
    2011, 40(04):  36-40. 
    Asbtract ( 1915 )  
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    To select the appropriate mining methods for the areas of Jiaojia Gold Mine, the stability of rock mass was classified.To overcome the one-sidedness of traditional methods, the method of combining Analytic Hierarchy Process with Fuzzy Comprehensive Evalution was selected.Taking the -270 m middle part of Jiaojia Gold Mine for example, all the influencing factors were fully considered to establish the comprehensive evaluation index system.And the weight vector of all index factors was determined according to the Analytic Hierarchy Process and the membership matrix was established by the principles and methods of fuzzy mathematics.The comprehensive evaluation vectors of rock mass stability determined by fuzzy comprehensive evaluation were （0.052 1, 0.556 2, 0.246 9, 0.135 4, 0.009 4）.It is seen that the rock mass of this part is relatively stable, which is in accord with the actual investigation.
    Numerical Simulation on the Creep Rupture of Coal Rock Layered Slope
    HE Feng, WANG Lai-Gui, YAO Zai-Xing, WANG Zhen-Wei, ZHANG Li-Lin
    2011, 40(04):  41-44. 
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    Under the co-action of external and internal structure, the coal rock layered slope possibly results in the massive landslide.With application of the maximum tensile stress theory, the creep rupture judgment criteria are established and the initiation, expansion and gathering of the creep cracks are described by the finite element.Based on the programmed creep rupture module by FEPG software, cracks are generated at the vertical direction of first principal stress vector, then expended to find the maximum of the first principal stress.When it reached the tensile strength, the creep cracks happened.This process is continuously cycled.Taking the slope of Haizhou National Open-pit Park as a research case, the creep rupture of coal (rock) separate layer is simulated.Combining with the on-site monitoring, the result of real measurement is coincided with that of the simulation, which provides a basis for the coal (rock) slope support and prevention of the disaster.
    The Octree Ore Body Block Model and its Application in Sandaozhuang Open Pit
    ZHANG Ying, YANG Chun, LI Fa-Ben
    2011, 40(04):  45-49. 
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    The ore-body block model is not only widely used in ore grade and reserve calculation，but used in the optimization of the final mining boundary and mining plan in the open pit.According to the investigation on octree storage structure and OBB intersection test theory based on the separating axis, it is proposed that the three dimensional space of ore body is firstly subdivided into small blocks by the octree, and the ore-body is approximated by a series of small unit blocks; Then, the spatial relationship between unit blocks and the ore boundary is detected by the OBB theory to subdivide the unit blocks of intersection.According to judgment of the point in the polyhedron or not to ensure block model constrained in the surface model, ore-body boundary can be fully approximated.Finally the ore body block model of Sandaozhuang open pit is created by this method, showing it an effective method which can meet needs of production design for the mine.
    Study on Shear Flocculation and Flotation of Magnetic Separation Concentrate in Qidashan Iron Ore
    YUAN Hong-Qian, HAN Yue-Xin, LI Yan-Jun, LIU Jie, WANG Ze-Hong
    2011, 40(04):  50-53+71. 
    Asbtract ( 1731 )  
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    Due to the high grade of flotation tailings that caused by the low recovery of fine particles in floatation process of Qidashan Iron Mine, Petroleum Sulfonate was used as collector and flocculating agent to make the shear flocculation and flotation tests on Qidashan magnetic separation concentrate in laboratory test.The results indicated that the optimum conditions for the shear flocculation and flotation are the grinding fineness of -0.037 mm 85%, pulp pH at 3, the dosage of Petroleum Sulfonate as 5 kg/t, water glass of 300 g/t, stirring intensity of 2 200 r/min, and shear time at 6 min.Under this condition, a good iron concentrate index with Fe grade of 66.80% and Fe recovery of 95.93% and Fe grade of tailings 5.03% only were obtained firstly by the shear flocculation of magnetic separation concentrate, then following by one closed-circuit flotation process of one-roughing, one-scavenging and three-cleaning.
    Research on Reduction Roasting Mechanism of Flotation Middling Containing Siderite in Donganshan Sintering Plant
    Mahamadou A Traore, YIN Wan-Zhong, LI Li-Xia, MA Ying-Qiang, JI Xiu-Rong, LU Ji-Wei
    2011, 40(04):  54-57+71. 
    Asbtract ( 1971 )  
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    Through roasting-magnetic separation technology to treat flotation middling containing siderite at 700 ℃, an iron concentrate with Fe grade of 60.43% and Fe recovery of 83.59% was obtained.The study mainly focused on transforming mechanism of iron minerals in reductive roasting process by XRD and scanning electron microscopy.The results showed that with the roasting temperature changed, the roasting process went through three stages like the decomposition of siderite, the reduction of hematite and iron mineral reduction reaction, where the roasting temperature at reduction stage of hematite was just at 700 ℃.At this time, the iron minerals in calcined products are mainly magnetite, which is the most conducive to low intensity magnetic separation.
    Study on Beneficiation Tests of an Extremely Low Grade Magnetic Iron Ore in Hebei
    MA Huai-Xiang, HU Yi-Ming, HUANG Fu-Ming-Zhu, LIU Jun
    2011, 40(04):  58-61+76. 
    Asbtract ( 1978 )  
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    The extremely low grade iron ore in Hebei contains 15.69% of TFe only, and iron ores mainly exist in magnetite (50.16%).In order to provide the technical support for the development of the ore, beneficiation tests on recovery of magnetite are made by the process of dry pre-concentration-stage grinding-low intensity magnetic separation and the process of pre-concentration-stage grinding-fine screening-stage low intensity magnetic separation.Then, the iron concentrates grading at 66.12% and 66.20% with Fe recovery of 50.14% and 49.87% are respectively obtained.According to the experimental results, and combining with the practice of beneficiation at domestic, the process of dry pre-concentration-stage grinding-fine screening-stage low intensity magnetic separation is recommended.
    Preparation of 57% Molybdenum Concentrate with New Machine-Column Flotation Process
    WANG Yi-Jing, ZHANG Xue-Wu
    2011, 40(04):  62-66. 
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    In view of the problems in conventional flotation process for the preparation of 57% molybdenum in Jinduicheng Molybdenum Group, studies on new technology and its design and the industrial tests of machine-column joint flotation are carried out.Through process optimization with joint of machine-column flotation, the advantages of high separation efficiency and high recovery by machine-column joint can be fully played, and all molybdenum concentrate grading at Mo≥57% is produced with no low-grade by-product concentrate and more than 98% of recovery rate.
    Study on the Influence of Pulp pH Values and Potentials on Flotation Behavior of Sphalerite
    LI Wen-Juan, SONG Yong-Sheng, ZHOU Gui-Ying, LIU Shuang
    2011, 40(04):  67-71. 
    Asbtract ( 1765 )  
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    The influences of pulp pH and different potentials on the flotation behavior of sphalerite with sodium diethyldithiocarbamate（DDTC）or butyl xanthate as collector were studied.And the adsorption capacity of sphalerite on sodium diethyldithiocarbamate（DDTC）or butyl xanthate in different pH values and different potentials were also analyzed by ultraviolet spectrum.The result showed that with the two collecting agents, the flotation of sphalerite was realized at acid conditions of less than pH4.67 and its floatability was seriously decreased with the potential lowered than the original one.The analysis results by the ultraviolet spectrum are consistent with the floatation behavior of sphalerite.
    Process Mineralogy Characteristics of Tonghua Songbailing Copper-nickel Ore
    ZHOU He-Peng, TAN Liang, JIANG Xue-Rui, TANG Xue-Kun, LUO Xian-Ping
    2011, 40(04):  72-76. 
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    In order to provide basis for separation process of Songbailing copper and nickel ores in Tonghua Ji'en Nickel Industry Co., Ltd., the process mineralogy on the ores are studied.Research results show that copper and nickel ores mainly exist in chalcopyrite and niccolite.Some factors like complicated disseminated characteristics of copper and nickel minerals, fine disseminated grain size, and existence of numerous magnesium-bearing gangue minerals bring adverse impact on the separation of copper and nickel.
    Study on Influencing Factors in Preparation of Iron Oxide Red Seed with Ammonium Process
    LIANG Xu-Shu, CHENG Shuai, SUN Ti-Chang, WANG Dian-Zuo
    2011, 40(04):  77-82+93. 
    Asbtract ( 1676 )  
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    The preparation of the iron oxide red seed by ammonium process with FeSO4 as raw material, and the influencing factors in preparation process has been studied in details.The results showed that under conditions of the concentration of ferrous sulfate of 30 g/L, reaction temperature 16 ℃, the volume of air 20 L/h, the addition of the diluted ammonia water 34 mL/L (molar ratio of NH3H2O and FeSO4 2.17∶1), and the adding rate of diluted ammonia water 0.45 mL/s, the best seed are generated with short reaction time.
    A New Method for Determination of Arsenic and Mercury in Copper Concentrates：By High-pressure-airproof Microwave Digestion, Sequential Injection, Hydride Generation, and Atomic Fluorescence Spectrometry
    SU Ming-Yue, YANG Li-Fei, GUO Fen
    2011, 40(04):  83-88+93. 
    Asbtract ( 1773 )  
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    A new method for the determinations of arsenic content and mercury content in copper concentrates was founded by adopting two processes of high pressure-airproof microwave digestion and the sequential injection-hydride generation -atomic fluorescence spectrometry.Through tests, the optimum conditions for detection were determined.The tests results indicated that the detection limit of arsenic was 0.02 μg/L and the detection limit of mercury was 0.05 μg/L by this method.While detecting arsenic and mercury content in copper concentrate, it is found that the arsenic and mercury recovery rates reached 94.3%~107.0% and 91.0%~102.0% respectively with relative standard of deviation between 0.93%~1.97% for arsenic and 3.11%~ 8.07% for mercury.Also, these detecting results are in good agreement with the certified values and the values by the national standard method.
    Study on High Temperature Oxidation Kinetics of Magnetite
    ZHU De-Qing, LUO Yan-Hong, PAN Jian, ZHOU Wen-Tao
    2011, 40(04):  89-93. 
    Asbtract ( 1718 )  
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    The oxidation kinetics of magnetite at 750~900 ℃ in air are studied by using thermogravimetric analysis.The results show that the oxidation rate of magnetite concentrate is much greater than that of pellets, and its oxidation reaction can be basically completed within 2 min.The larger specific surface area is, and the higher temperature is, the faster the oxidation reaction rate of magnetite concentrate will be.The oxidation of magnetite is controlled by chemical reaction at the initial stage and by combination of chemical reaction and gas inner diffusion at later stage.According to the oxidation rate of concentrate and its FeO content, the suitable time required for the different pellet during preheating can be determined.
    Research Status of Flotation Separation of Arsenic-bearing Sulfide Ore
    MA Ying-Qiang, YIN Wan-Zhong, LI Qiang, HONG Zheng-Xiu
    2011, 40(04):  94-97. 
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    The paper introduces the current method of Arsenopyrite and pyrite flotation, and summarized the research progresses in new arsenic-removal reagents and the flotation process for arsenic-bearing sulfide ores.
    Digital Mining Modeling in Fenghuangshan Copper Mine
    JIA Jian-Hong, WANG Yong-Sheng, REN Zhi-Yong, HU Jing
    2011, 40(04):  98-100+103. 
    Asbtract ( 1946 )  
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    Built the geological database of Fenghuangshan Copper Mine based on digital software Datamine, generated a 3D drillhole model and delineated the ore body.Then, such achievements as database query, modification, real-time updating, output automation and visual of mine geological information were realized, which offers the important decision-making platform for the mine production and design.  
    The Geological Significance of Xiaohulishan Molybdenum Polymetallic-rare Metal Deposit
    WANG Ji-Chun, WANG Jing-Fan, XU Yong-Wang, ZHANG Yong-Qing
    2011, 40(04):  101-103. 
    Asbtract ( 1958 )  
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    Xiaohulishan Pb-Zn molybdenum deposit is a medium-large scale concealed deposit recently discovered in Beishan area of Inner Mongolia.Its major ore bodies are mainly classified in three facies such as the marginal facies, the transitional facies and the central facies.Metallic minerals are mainly composed of molybdenite, pyrite with the rare metal ores associated.The deposit belongs to the typical porphyry molybdenum-rare metal deposit, and formed in Trias.It is the generation of Indosinian tectonics and magmatic activity.And due to its typical character of ore-forming, there is a big potential for ore prospecting of similar ore deposits.
    Research on Multi-element In-situ XRF Technique on Drilling Cores and its Application
    ZHENG Xing-Guo, CHEN Fang-Qiang, GE Liang-Quan, ZHOU Si-Chun, WANG Zi-Yun, WANG Yong-Lei
    2011, 40(04):  104-107+165. 
    Asbtract ( 1801 )  
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    Comparing with the chemical analysis, X-ray fluorescence analysis has feature of more efficiency and lower cost.With proper technique, X-ray fluorescence analysis can substitute the chemical analysis in a certain extent to rapidly get the ultimate composition and the content of the drilling cores.The borehole cores of ZK1601 and ZK12101 at Huang Shaping are measured, and the variation relationship between the contents of Cu, As, Ca, Cr, Fe, Mn, Ni, Pb, Sr, Ti, W, Pb, Zn, with the depth are given.And combining with geophysical and geochemical exploration, the enrichment depth of copper mine and the other elements are successfully delimited.That X-ray fluorescence analysis is effective in measurement of drilling cores.
    Optimized Configuration of Mechanical Equipment in Open-Pit Mines Based on the Compound Interest Method
    WU Chang-Zhen, DAI Jian-Yong, YANG Shi-Jiao
    2011, 40(04):  108-110. 
    Asbtract ( 1751 )  
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    Considering the time value of funds, based on the depreciation method of compound interest and the relationship between mine production scale and equipment capacity and actual conditions of mines, the paper solves the optimized configuration problem about the type of main mechanical equipment and the quantity by applying integrated planning and Matlab software at the preliminary scheduling phase.This optimized configuration scheme brings better benefits for mining enterprises and provides a new idea about optimized configuration of equipment in capital construction phase of mine.
    Transformation Technique from CAD Mine Map to GIS Mine Map
    GONG Liang-Wei, HAN Fu-Shun
    2011, 40(04):  111-114. 
    Asbtract ( 1970 )  
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    This paper expounds the differences between CAD mine map and GIS mine map and the necessity of the transformation from CAD mine map to GIS mine map.Meanwhile, the process of the transformation and the considerations are stated under the environment of AutoCAD Map 3D.Taking the real mine map of Licun Coal Mine as a case, the steps in transition from CAD mine map to GIS mine map under AutoCAD Map 3D are described.
    Creation of Mining and Geological Standard Library Based on AutoCAD
    HE Hu-Jun, ZHAO Ya-Ning, YANG Ben-Sheng
    2011, 40(04):  115-118. 
    Asbtract ( 1956 )  
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    The paper analyzes the significance of mining and geological standard library creation, describes the content composition, the main function and creation principles of mining and geological standard library, and introduces creation methods, key technologies and the essentially-attentioned questions of five standard libraries on the basis of AutoCAD such as mining and geological standard linear library, mining and geological standard filling pattern library, mining and geological standards layers library, mining and geological standard legend library, mining and geological standard metafile library.The successful creation of mining and geological standard library provides the necessary conditions for the research and application of mine-map digital design, drawing and management.
    High Gradient Magnetic Separation of Low Grade Hematite with the Air-flow
    WANG Jian-Ping, LI Bao-Wei, ZHAO Rui-Chao, ZHANG Bang-Wen
    2011, 40(04):  119-122+133. 
    Asbtract ( 1668 )  
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    One new type of HGMS was designed|which has a feature of introducing airflow into the separation process to increase the concentrate grade.This new device was applied to the tests on improving low grade hematite (18.2%) which were generated from oxidized ores by low intensity magnetic separation in Baosteel Dressing Plant.The results indicated that with the air flow rate of 0.16 m3/h, iron concentrate grading at 48.2% with a recovery of 53.39% was obtained by the process of roughing-grinding-two cleanings.Compared the tests without airflows, the grade of iron concentrate was increased by above 3% and its recovery decreased by less than 1%.The analysis ascribed the increase of iron concentrate grade by airflow to the air-flow agitation and the negative pressure or strong disturbance as gas bubbles broke down.
    The Improvement of Overflow Discharge on Spiral Classifier
    WANG Xiang, ZHOU Xing-Long, ZHANG Xiao-Ming
    2011, 40(04):  123-125. 
    Asbtract ( 2293 )  
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    The  overflow discharge of spiral classifier is changed to be bilateral discharging from the traditional front-end approach, forming a  spiral classifier with bilateral discharging.Then this new spiral classifier was used to carry out the pilot plant classification tests on one-grinding products of a sulfide ore, and compared with the traditional spiral classifier.The results showed that under different feed concentration, gradient of spiral classifier and feed flow rate, the efficiency of the bilateral spiral classifier reached up to 52.21%~73.06%.Comparing with the traditional classification of spiral classifier, its classification efficiency can be improved by at least 5.77%, and at most 17.74%.
    Integrated Management System of Stope Safety Production for Underground Metal Mines
    LI Guo-Qing, HU Nai-Lian, CHEN Yu-Min, XIU Guo-Lin
    2011, 40(04):  126-129. 
    Asbtract ( 2227 )  
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    The components of stope safety management for underground metal mines were summarized according to the requirements of safety production, which include the safety of environment states, personnel behaviors and equipment operations, as well as the safety guarantee system.Based on this, the vertical projection drawing of stopes was selected as base maps to develop an integrated management system of stope safety production for underground metal mines based on the Geographical Information System (GIS).So that the function system of the safety production management for stopes was formed by taking single stope as basic unit, which realized the distributed management and integrated demonstration of the safety production information about stopes.
    Study on the Occupational Hazards Evaluation System of Underground Mine
    WANG Xue-Ni, GUO Jin-Ping
    2011, 40(04):  130-133. 
    Asbtract ( 1833 )  
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    Mining industry owns a high incidence rate of occupational diseases.According to the characteristics of mine enterprise's safety production, the occupational hazard evaluation system for underground mining enterprise is formed, and the multi-grade fuzzy comprehensive evaluation model of underground mining occupational hazards conditions is established based on fuzzy theory, showing the corresponding evaluation index, standards and weights.Application examples showed that this evaluation system quantitatively reflected the occupational hazards of mining enterprises from the various levels and the overall situation, which provides technical support for management of occupational hazards of mining industry.
    Study on Flow Slide Destruction Models Induced by Seismic Liquefaction and Stabilizing Measures of Tailings Dam
    PAN Jian-Ping, WANG Sheng-Yi, ZHU Hong-Wei
    2011, 40(04):  134-136. 
    Asbtract ( 1833 )  
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    The phreatic line is higher at upstream-type tailings dam and most of dams are in saturated state, thus easily leading to flow slide destruction under earthquake.Though analyzing the earthquake disasters of tailings dam, the mechanism of flow slide destroy induced by seismic liquefaction are studied, and the four flow slide destroy models are proposed from aspects of base destroy, initial dam destroy, sub-dam destroy and inside flow destroy.Then the stabilizing measures for liquefaction flow slide of tailings dam and their consolidated effect are discussed.It plays a significant role in guiding the anti-seismic design of tailings dam, improving the level of safety management and reducing the disaster loss.
    Study on Strength Prediction of Cave-in Mine Tremor
    XIAO Gang, ZHENG Huai-Chang, HU Long
    2011, 40(04):  137-140. 
    Asbtract ( 1870 )  
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    Underground engineering structures losing its stability is possibly induced by cave-in mine tremor, resulting in large cave-in of rocks roof in mined-out area.Based on velocity to measure the shock strength of mine, this paper summarized the relationship between the vibration velocity of base rock and the potential energy of fall rocks by the laboratory impact experiment of rock block fallings.Based on this, through tests of throwing rocks, the vibration effect caused by the impact of rocks to floor and the attenuation rules of velocity in rock layers are discussed and studied, establishing a strength prediction model of the cave-in mine tremor in mined-out area.
    On Monitoring  Mining Disorder Activity with Microseismic Monitoring Technology
    南Shi-Qing , LI Fu-Ping, HAN Rui-Liang, GUO Xian-Zhang, SU Ming, WAN Xiao-Jun
    2011, 40(04):  141-143+148. 
    Asbtract ( 1817 )  
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    Illegal mining around large state-owned mines badly affect the mining orders and production safety, resulting in great risk.Taking the space-time orientation technology of the microseism monitor as a theoretical basis, the real-time monitoring of mining disorders was realized by application of the second development function of microseism monitoring system, and the accurate positioning of illegal mining are made.It can guide law enforcement officials to promptly fight and remove the illegal mining, which provides an effective technical means for mineral resources and mine safety of our country.
    Discussion and Application of Cooling Schemes in Mining of Deep Metal Ore with High-temperature
    HE Mao-Cai, CHEN Jian-Hong, YONG Xue-Yan
    2011, 40(04):  144-148. 
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    Deepwell mining is the most effective solution to resolve the conflict of ore supplies.However, deepwell heat-harm has been endangering the mining seriously.The research results and the current striving direction on control of deepwell heat-harm at home and abroad are analyzed and summarized, and the origin of deepwell heat-harm and its control measures are concluded and compared.Combining with mining conditions in a foreign deep gold-copper mine with high temperature, the control schemes for heat-harm are determined by weighing various factors comprehensively.And waste heat in roadway is eliminated by using cooled inlet wind on the ground, and the water cooling system is applied to treat heat-harm of dead working face, thus providing theoretical support and technical reference for domestic mine with high-temperature.
    Study on Purification and Recycling of Dressing Wastewater from Mengzi Lead-zinc Mine
    KONG Ling-Qiang, QIN Wen-Qing, HE Ming-Fei, LIU San-Jun
    2011, 40(04):  153-156+161. 
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    The influences of three flocculants such as PFS, PAC and Alum on the treatment efficiency of waste water in Mengzi Lead-zinc Mine are contrasted.Based on this, PFS combining with coagulant polyacrylamide are selected to remove metal ions from wastewater by coagulating sedimentation.Then, the activated carbon is adopted to adsorb the organic pharmaceutical residues in wastewater, so as to make the metal ion content in wastewater and the chemical oxygen demand up to the discharge standard.The treated wastewater is recycled in the lead-zinc ore flotation tests of Mengzi lead-zinc ore, obtaining the close concentration index as that by fresh water.It is proved that the wastewater can totally be recycled to the production of mineral processing.
    Beneficiation Experiments of Ore-washing Overflow of an India Hematite Ore
    WANG Shi-Biao
    2011, 40(04):  157-161. 
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    In order to provide the basis for making use of  ore-washing overflow of India hematite with Fe grade of 50%, the beneficiation experiments on ore-washing overflow were carried out by the process of fine screening-high intensity magnetic separation-anionic reverse flotation and the process of fine screening -spiral chute -high intensity magnetic separation-anionic reverse flotation.The tests results showed that under grinding fineness of -0.076 mm 75%, the concentrate with Fe grade of 67.01% and 67.12%, and Fe recovery of 87.77% and 89.71% were obtained respectively by the two processes.Since the latter decreased the flotation process by about 1/3 comparing with the former, the latter process is recommended.
    Study on the Beneficiation Technology of a Copper-Bearing High Sulfur Magnetic Iron Ore
    TANG Xue-Feng
    2011, 40(04):  162-165. 
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    In view of the characteristics of copper-bearing and high pyrrhotite of the magnetic iron ore, beneficiation tests are carried out by the process flow-sheet of low intensity magnetic separation-concentrate inverse flotation desulphurization of low magnetic separation-low intensity magnetic separation of tailings to obtain iron concentrate grading at 66.85% with a Fe recovery of 67.82% and sulfur content of 0.20%, copper concentrate grading at 23.40% with a Cu recovery of 64.06% and the additional sulfur concentrate grading at 23.05%.Then, a comprehensive recovery of iron, copper and sulfur is realized.The results show that oxalic acid for selective activation of pyrrhotite, and high collecting ability of new collector CYS on pyrrhotite are the key factors for realizing high efficient separation of magnetite and pyrrhotite.