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Table of Content

    15 October 2010, Volume 39 Issue 10
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    The Influence of Depressurized and Bolt support to Tunnel Stability in High Stress Area
    WANG Wen-Jie
    2010, 39(10):  1-5. 
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    The influences of the variation of bolt space on the tunnel deformation and the bolt stress under different depressurized rate are analyzed with FLAC3D The tunnel deformation damage with the pressure relief mining under the bolting support in Chambishi copper mine of Zambia and that with the anchor bolt support in Jinshandian iron mine of Wusteel are comparedThe theoretical analysis and the project cases show that the pressure relief can effectively control the tunnel deformation levelAnd the bolt support does not mean to control the tunnel distortion but coordinate the tunnel distortion of around rock massTherefore，in the high ground pressure area，the primarily work is to control the ground pressureAlso，together with effective support method and parameters，the stability of the tunnel deformation can be maintained well
    Study on Supporting of Rock Instability based on the Rhombus Thought
    Yang Zhijun, Ren Fenhua
    2010, 39(10):  6-9. 
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    The rhombus thought is applied to the roadway support design.According to the specific feature of tunnel，the eigenelement of the supporting is determined，and the right matter element model for the supporting is established.From different feature units，many different supporting elements are diverged and generated.Based on the knowledge of rock mechanics，the convergence condition of roadway support is given to filter out the generated supporting element.And the FLAC software is also adopted to make the numerical simulation to finally determine the optimal supporting method.
    Prediction Methods of the Surface Subsidence Induced by Underground Mining
    MU Wei-Gang, SUN Shi-Guo, FENG Shao-Jie
    2010, 39(10):  10-12,43. 
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    In view of the research progress on current rock mass movement，the advantages and disadvantages of 7 predictions of the surface movement distortion is discussedCombining with some cases of coal mining project，FLAC3D numerical analysis method is used to forecast the surface movement rules and the distortion tendencyAnd its data are processed with the excel tableHence，its trend，the typical curve of dip section and the expression of rock mass migration parameter are determined，thus providing a reference for the prediction of the surface migration and the distortion in the actual project
    Numerical Simulation on the Surface Subsidence of Key Spacing Bond Control in Underground Filling
    WANG Xiao-Jun, FANG Sheng-Yong, LIU Ji-Xun
    2010, 39(10):  13-16,87. 
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    Large minedout area appeared after multi-level mining with open stoping method in metal mine，and large-size minedout area is main reasons for the surface subsidenceTo protect safety mining of the medium section and control surface subsidence，it is suggested to choose a reasonable level to make overall filling and forming stress spacing bond before deep miningIn order to ensure the reliability of the filling key bond scheme，and taking a gold mine as the example，the overall mining and filling process is stimulated with three-dimensional finite element analysis software of elastic plasticity.Based on the analysis of surface subsidence displacement，a reasonable result is achievedIt is verified that the filling key bond for the medium-section ore-body is the effective factor which control the surface subsidenceIt provides ascientific basis for the on-site construction
    High-efficient Mining Technology of Continuous Ore-drawing with Sub-section Advancing for Flat-dipping Thin Ore-bodies
    LU Shi-Jun
    2010, 39(10):  17-19,23. 
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    The common problems existing in the exploitation of flat-dipping thin ore-bodies are that the production capacity is lower and the recovery is difficult.Through developing the inclined well and adopting belt hoisting，continuous ore-drawing at medium belt transport，and sub-section advancing mining process，no  or less pillar remained，the continuous recovery can be realized.The working width should be controlled to maximize the ore recovery and reduce the dilution so as to effectively solve the problems in mining and transportation.This method can provide a new idea for the efficient exploitation of thin ore-body，and the research results play an important role in high efficient mining of thin mineral veins.
    Application of Rough Set Attribute Reduction in the Prediction Model of Infiltration Route in Tailing Dam
    WANG Yun-Hai, LI Chun-Min, XIE Xu-Yang
    2010, 39(10):  20-23. 
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    During the establishment of the support vector regression（SVR) prediction model of infiltration route data in tailing dam，the prediction accuracy and the computational time are two difficult problems to control，which severely constrain the extensive application of the SVR model.To solve these two problems，the rough set（RS) algorithm is adopted to reduce the attribute for training samples，then the prediction model of infiltration route is established with the SVR algorithmThe cases proved that RS-SVR model effectively lowered the difficulty of SVR model iteration，and made the prediction accuracy improved.It can be seen that the RS-SVR is feasible not only in theory but in application.
    Determination of the Hydraulic Supporting Resistance Based on a Simplified Structural System
    MENG Da, SHEN Jie, ZHAO Yuan
    2010, 39(10):  24-27,37. 
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    Due to studying on the relation of the supporting frame and the surrounding rock of fully-release mining in large mining height stope，the paper analyzed the movement rule，internal force，and displacement of the hydraulic supporting frame -roofoverlying rocks and the falling rock mass，and the movement rule of the dynamic balance arch and the multispan beams under the arch to determine the working resistance of the hydraulic supporting frame and the overlying rocks.Through the simulating experiments in Lab，its movement rule is verified.Meanwhile，with the numerical simulation based on FLAC3D，the damage mechanics model is used to simulate the variation of the internal force in actual mining of the roof- the overlying rocks of the large mining bench and get its distribution so as to affirm the structural system method.
    A Practical Algorithm for Final-Pit Optimization in Open-Pit Metal Mines
    GU Xiao-Wei, GE Shu, WANG Qing, XIN Ming-Yin, HU Zhi-Qiang
    2010, 39(10):  28-30. 
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    This paper presents a practical final-pit optimization algorithm for open-pit metal mines based on a breakeven strip ratio and a block model of ore grade.In this algorithm，the optimum final-pit is obtained by using a cone-scanning and eliminating process to strip off the portions whose instantaneous strip ratios are greater than the breakeven strip ratio，starting from the geometrically bounded pit which is the largest possible pit limit.The algorithm can easily incorporate different final-slope angles in different directions and zones，and different bench heights in different altitude ranges.The application showed that the algorithm was computationally efficient and highly practical.
    Stability Research of the Fluid-solid Coupling of High and Steep Rock Slope
    ZHANG Qiang, CHAO Li-Hua
    2010, 39(10):  31-33,175. 
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    The finite element method is adopted to build a simulation model of high and steep rock slope of open pit in Pingchuan Iron Ore.Based on the seepage mechanism analysis of groundwater at open pit，the coupling model of both seepage field and stress field is established，and the coupling stability of finite element two-dimensional slope seepage-stress field for high and steep rock slope at open pit is calculated，with the safety coefficients given.With the comparison of the results by the finite element method and the limit equilibrium method，it is found out that their safety coefficients are consistent，and the shear cracks caused by slope landslide are similar，and their destruction curves are coherent also.
    Evaluation on the Supply Security of China Iron Ores Based on SPSS
    LIU Xian-Xin
    2010, 39(10):  34-37. 
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    The supply security of iron ores will influence and determine the sustainable development of economic and society of China.According to the needs of iron ore supply security evaluation，a supply safety evaluation system for iron ore was built with some correlative factorsBased on this，the situation of iron ore supply safety in recent years of China was analyzed with analysis of the principal component and the safety level，thus providing a reliable foundation for drawing the strategies，principles and policies of mining industry development of China.
    Progress of the Methods of Graphite Purification
    GE Peng, WANG Hua-Jun, JIE Lin, ZHAO Jing, ZHANG Qiang
    2010, 39(10):  38-43. 
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    A detailed description is given on various methods for graphite purification at home and abroad，mainly including flotation，alkali-acid method，hydrofluoric acid washing approach，chloridizing roasting and purification in high temperature.Based on the systematic exposition of their basic principles，progress conditions，research progresses and practical applications，the comparison of the merits and demerits of these methods have led to a conclusion，which is that the alkali-acid method could still be considered as the best way in graphite purification after being improved.
    Application of Sodium Sulphide in the Separation of Lead-copper
    SUN Wei, DONG Yan-Hong, ZHANG Gang
    2010, 39(10):  44-47,56. 
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    The investigation on the reagent removal effects of sodium sulfide to copper and lead mixing concentrate by the sensitivity of the new combined inhibitor DW after reagent removal of mixing concentrate were carried out.It was affirmed that it had a remarkable removal effect, and there are some differences in inhabitation of the copper and lead mixing concentrate by DW.With the application of UV spectrophotometry, and solution chemistry method, the reagent removal mechanism of sodium sulfide was studied.The results showed that in the experimental conditions, a competitive adsorption happened between HS-by hydrolysis of sodium sulfide and butyl xanthate ion adsorbed on the surface of the minerals and made the butyl xanthate ion realize desorption.This is the basic reason for that sodium sulfide has a remarkable reagent removal effect on the mixed copper and lead concentrates by xanthate flotation.
    Research on Mineral Processing Technology For A Tungsten Ore In Jiangxi
    LUO Xian-Ping, YANG Bei, LUO Li-Ying, ZHOU Xiao-Wen, ZHANG Jun
    2010, 39(10):  48-51,56. 
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    The paper introduces the native quartz-tungsten bismuth poly-metallic ore type from a tungsten ore in Jiangxi, and analyzes its process mineralogy feature.A systematic and comprehensive study on the reasonable beneficiation process for this ore is carried out to explore the important technical parameters.The research results showed that the ore is a kind of coarse, less impurities, ore that is easy to be concentrated.By adopting the process of（jigging + shaking table) rough classification-floatation desulphurization-magnetic separation,Tungsten concentrates grading 64.27% at a recovery of 77.65% was achieved from the raw ore with WO3 of 0.51%. 
    The Growth Characteristics of Metallic Iron Grains in Depth Reduction of Oolitic Hematite
    JIA Yan, NI Wen, ZHENG Fei, FENG Jin-Peng, WANG Zhong-Jie, XU Cheng-Yan
    2010, 39(10):  52-56. 
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    Based on the characteristics of some unwieldy oolitic hematite ores, tests on depth reduction-magnetic separation are carried out.The growth characteristics of metallic iron grains in depth reduction of unwieldy oolitic hematite are investigated. And the effects of different experimental conditions, such as reduction temperature, reduction time, binary basicity on the iron grains growth are discussed in detail.The results show that raising the reduction temperature and prolonging the reduction time are beneficial to the iron grains growth, while the over-high binary basicity is bad for the iron grain growth.
    Exploration of Reduction Roasting Mechanism and Effective Beneficiation 〖JZ〗Process for Oolitic Hematite Ore from Western Hubei
    QI Chao-Ying, YU Yong-Fu, ZHANG Ya-Hui
    2010, 39(10):  57-60. 
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    The paper analyzed the ore properties of oolitic hematite in Western Hubei.And the contrast study on reduction roasting -magnetic separation effect of this oolitic hematite and that of several domestic typical refractory oxidized iron ores found that the magnetization effect of roasting for oolitic hematite ore from western Hubei was much different from those for hematite, limonite and siderite ores under same magnetizing roasting conditions.The mechanism for reduction roasting of oolitic hematite ore was discussed and analyzed.It is proposed that a way of adopting flash magnetizing roasting-magnetic separation process after reducing particle sizes of feeding (below 0.2 mm), and is a promising approach for recovering the oolitic hematite ore in western Hubei province.
    Study on the Ore Properties of High Phosphorus Oolitic Hematite in Western HuBei
    WEI Dong
    2010, 39(10):  61-64. 
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    This paper describes the mineral composition and structure of the Ningxiang type  high-phosphorus Oolitic hematite in western Hubei, and emphatically introduces the occurrence of main minerals including Hematite, Limonite, Apatite, Oolitic chlorite, Quartz etc.and the embedment features of the target minerals, such as hematite and phosphate.Then, and the occurrence of phosphorus is analyzed, and the approach on the Iron increase and phosphate reduction and the related main difficulties are summarized from the aspects of process mineralogy.
    Study of the Pentlandite Self-induced and Externally Controlled Voltages Flotation Behavior
    CHEN Yong, SONG Yong-Sheng
    2010, 39(10):  65-67. 
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    The basic behavior of self-induced flotation and externally controlled voltages flotation of pentlandite was investigated.It was shown that pentlandite exhibit good self-induced floatability in the acidic condition and the self-induced floatability can be changed under externally controlled voltages.However，the self-induced floatability of pentlandite can not be realized and even hardly be improved by externally controlled voltages in alkaline condition.Through the cyclic voltammetric curve analysis on the externally controlled voltages，the sulphur element may be the primary hydrophobic entity on the surface of pentlandite.
    Mechanism of Incrustation and Anti-incrustation during Acidic Leaching Process
    YAN Jia-Long, WU Ai-Xiang, WANG Hong-Jiang, WANG Yi-Ming, LIU Wei-Fang, HUANG Ming-Qing
    2010, 39(10):  68-71，150. 
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    During the process of heap leaching, incrustation is easy to precipitate on the surface of ore, which leads to decrease of the permeability of leaching yard and finally affects the leaching rate.Taking the acid heap leaching technique of a high-slurry high-alkali ore in Yunnan as background, the SEM scanning and X-ray diffraction analysis on the leaching ores of incrustation showed that the  composition of incrustation was mainly CaSO4, that is because Ca2+ was continuously generated, which absorbed the SO42+ in leaching process.By adding different anti-incrustation agent in experiments, and with the help of scanning electron microscopy, the inhibiting effect of the anti incrustation agent on the incrustation of ores was verified.The mechanism of the anti-incrustation agent was mainly chelate effect and crystal distortion effect.
    Study on Enrichment Technology of A Silver-bearing Multi-metal Manganese Ore
    YU Li-Xiu, TANG Xiang-Hu, ZHANG Ran, SONG Guang-Yi
    2010, 39(10):  72-74. 
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    The paper analyzed the difficulties in separation of Manganese and Silver for a silver-bearing multi-metal manganese ore from the angle of process mineralogy. With a reference to the process mineralogy study of similar ores, and combining with the nature of this ore, one suitable process is proposed, which consists of dry screening classification-dry coarse high intensity magnetic separation-wet fine high intensity magnetic separation-mixed concentrate wet leaching.Through the laboratory tests, a mixed concentrate grading at 31.59% of manganese, 657.9g / t of silver, 11.72% of iron with a Mn recovery of 90.24%, Ag recovery of 91.29%, Fe recovery of 78.51% were achieved respectivelyThis process provides a basis for large scale, high-efficiency and low cost production of similar ores.
    Investigation of Beneficiation for a High Arsenic & Sulfur-containing Gold Ore from Anhui Province
    LI Yan, LIU Shuang, XU Zheng
    2010, 39(10):  75-77，184. 
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    The detailed mineralogical study about a high arsenic & sulfur-containing gold ore is carried out，and based on this，a magnetic separation-gravity joint test process is proposed.After the conditioning tests of grinding size for magnetic separation，magnetic strength，fineness for gravity separation etc.，the qualified sulfur concentrate with a 17.81% of recovery containing 36.11% of sulfur and 0.03% of arsenic，and gold concentrate with a 47.63% of recovery containing 16.84% of gold and 13.63% of arsenic are obtained.
    Experimental Research on Flotation Process for a Hematite Ore
    LI Jian-Ming
    2010, 39(10):  78-80. 
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    This paper briefly described the nature of a hematite ore and the investigation on its technical conditions for beneficiation from the grinding fineness, the type and dosage of reagent.With reference of the conditioning tests, a closed circuit experiment of one roughing-three cleaning-two scavenging-middle ores back to the feed was carried out.Then, iron concentrate grading at 62.55% with a 71.57% iron recovery of was obtained.
    Effect of Temperature on Reduction of Vanadium and Titanium Magnetite by Microwave Carbon Thermal Method
    MA Mang-Yuan, BAI Chen-Guang, QIU Gui-Bao, YU Yao-Wei, DENG Qing-Yu
    2010, 39(10):  81-84. 
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    Temperature is an important factor to affect the diffusion coefficient and the reaction rate.The experimental study on the variation of reduction process of vanadium titanium magnetite at the same time and different temperatures was performed, and the reduction mechanism of vanadium-titanium magnetite by microwave carbon-thermal was explored.The results showed the conditions of mass transfer and the reduction effects of can be significantly improved at 1 400~ 1 500 ℃, thus achieving vanadium alloy by removing iron slag.
    Discussion on the Mathematical Model of Material Mass Balance Calculation for Mineral Processing
    XIAO Yun, WANG Hai-Chen
    2010, 39(10):  85-87. 
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    The classic mathematical model of multi-metallic mass balance fully respected  the concentrate grade in testing, bur ignored the reasonability of adjusted raw ores' and tailings' grade.In view of these disadvantages, this classical mathematical model was upgraded and improved.The upgraded mathematical model takes into account the grade of raw ores, concentrates and tailings.The grade analysis of each product is more systematic and comprehensive, making it closer to the actual adjustment.So after adjustment, the results are more scientific, rational, reliable, which can meet the needs of the index adjustment for beneficiation.
    Design Method and Practice for Transporting Tailings Slurry with High Density
    ZHAO Yu-Xin, LI Xu-Zhong, WAN Jun-Li
    2010, 39(10):  88-89. 
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    This paper introduces the design method of high density tailings slurry transportation pipeline system with Qianjiaping vanadium ore of Shanxi as a case.Due to the existing problems in the design of transport line at the varied terrain，some measures and improvements are proposed.After completion of the project，the operation owns a high performance.The  esign can provide a reference for similar projects.
    Application of Multi-element X Fluorescence Measurement Technology in Ore Prospecting of the External Goldmine in Northwestern of Sichuan
    WU Li-Rong, ZHOU Si-Chun, 吕Shao-Hui , WANG Zi-Yun
    2010, 39(10):  90-93，133. 
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    The multi-element of x fluorescence spectrometry is applied for scanning work at about 4.05km2 external prospecting area of a goldmine in northwest of Sichuan province.Through the measurement of the indicator elements of As，Pb，Cu，Zn，Fe，the gold mineralization belt is prospected and delineated.With the aid of γ-ray spectrometry and rapid soil  easurement of α，the favorable gold occurrence location is captured after the final comprehensive chemical analysis of gold.This provides a basis for the engineering planning，and improves the rate of success on ore prospecting in external gold mine.
    Variation of Groundwater Flow Field and the Dewatering Countermeasures in Makeng Iron Mine
    CHEN Yue-Sheng
    2010, 39(10):  94-98，105. 
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    Makeng Iron Mine in Fujian belongs to a roof karst water-filled mine with complicated hydro-geological conditions.From mining start some years ago，sudden water inflow accidents constantly happened and have severely restricted the safety production.The groundwater flow field form mainly reflects the comprehensive hydro-geological condition.The paper  dopted the karst water level data of different periods to draw and analyze the karst water flow field form in each period.It is summarized that with continuously dewatering of karst water，the recharge，runoff and discharge conditions of karst  water system in Makeng mine is mainly controlled by the fault and also varied with karst development and lithology differences.And groundwater flow field form not only has no good consistency in space，but obviously restricts the overall dewatering of karst water in mine.For the main factors in variation of flow field form，a targeted dewatering  ountermeasure is proposed.
    Coordinate Transformation Model of High Breakdown  Contamination Rate with the Reference Points
    LONG Ren-Bo, GAO Jing-Xiang, YU Zi-Yan
    2010, 39(10):  99-101. 
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    According to the characteristics of the reference points in mining areas which were laid at early time and are easy to shift ，the theory of high breakdown contamination rate for the coordinate transformation with the reference points' displacements is proposed to ensure the quality of coordinate system transformation for the high precision GPS control network and eliminate the impact of the displacements existed in the transformation reference points on the transformed results.Then the estimation model for the coordinate transformation parameters and the quality evaluation system for transformed GPS network are established.Taking a Yanzhou mining area for example，the results show that the model can choose a reasonable and stable reference points and remain the high precision characteristics of GPS technology，also provide a high precision coordinate datum for the mining area.
    Fuzzy Density Statistical Method of the Occurrence of Rock Mass Structural Plane
    WU Peng-Cheng, SUN Qi-Guo, FANG Ding-Wang
    2010, 39(10):  102-105. 
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    Based on the principle of pole density statistics，and by applying the three-dimensional statistical method，the space analytic geometry is adopted to directly calculate the included angle.During the statistical process of density，the probability density distribution of the rock mass structural plane in sample space is assumed as normal distribution.According to this spatial distribution，the probability density of each pole is calculated，thus forming a density map with principle and method of the spherical projection.
    Study of Automatic Monitoring and Intelligent Recognition About〖JZ〗Underground Water Inrush Based on the Internet of Things
    ZHANG Hai-Long, WANG Tao, YU Lang, SHI Yu
    2010, 39(10):  106-109. 
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    Aiming at continuous water gushing accident of metal mines in our country，and applying with the technology of internet of things，the system with combination of automatic monitoring and intelligent recognition about water inrush with software and hardware is build，which can automatically monitor the height of underground gushing-water，and intelligently recognize the composition of gushing-water and its surrounding.All of these can reduce gushing-water accident.The production practice proved that this system is simple and feasible with a stable operation.Its good monitoring，alarming and intelligent recognizing functions make it own a brilliant foreground of application.
    GIS Spatial Data Organization of Constructed Wetland Ecological Treatment in Mining Subsidence Area
    WANG Jin-Hua, ZHAO Lin, LI Jun-Shuai
    2010, 39(10):  110-113，141. 
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    With development of the constructed wetland technology and extending of eco-city  concept，it is popular of the  sustainable evaluation and land reclamation of subsidence area in mining field.In view of the need of sustainable evaluation and land reclamation in mining subsidence area，this paper discusses mainly introduces the general structure of constructed wetland and ecological management GIS system in urban by COMGIS secondary development technology，with a resource-based Tangshan city as a case.With the organic combination of spatial information in Ecological Park，subsidence information in subsidence area， and remote sensing data at different phases，an innovative database model GIS map is built.Then the secondary index of database link is realized.Combining of the artificial secondary wetland assessment，urban ecological treatment，and by means of building the information platform of graphic data and attribute data，an advanced platform is established for land reclamation，ecological treatment assessment and spatial analysis of mining subsidence.
    Research and Development of Crusher Cleaner with Wireless Remote Control
    HAO Qi-Chang, JI Wan-Jian, SHANG Qi-Wen, SUN Zhen-Bo, WANG Qi
    2010, 39(10):  114-119，133. 
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    There always forms large stuck blocks or the arch-shaped bridging caused by the wet small pieces and powder materials in the top feeder of grizzly screen and the grizzly screen of underground slide for various types of crushers in each open mine of our country，which  seriously affected the material flow.The newly-developed clearer can break the bulky materials，and clean the arch-shaped powders.And this device adopts the hydraulic transmission and hydraulic shock crushing.Such three ways as wireless remote control，electronic control and manual systems can be quickly shifted，and some tools including hydraulic hammers，hydraulic pliers，hydraulic bucket，grab and digging buckets can be mounted in the operation so as to realize crushing，clamping，shoveling，grabbing，digging，hooking，picking and other functions.
    Application of Ventsim 3D Ventilation Simulation System in Metal Mines
    LIU Ming-Ming, XIE Zhen-Hua, ZHANG Jian-Ye
    2010, 39(10):  120-122. 
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    This paper introduces some problems occurred during the metal mine production process，including 3D simulation of complex mine ventilation system and simulation of high-temperature environment caused by deep mining.Ventsim 3D ventilation simulation system can realize various functions，such as ventilation network resolving，ventilation simulation，thermal simulation and economic simulation.It could meet the requirement of 3D ventilation system management in metal mines.The practice showed that Ventsim 3D ventilation simulation system could meet the requirement of mine e-managing，and eventually achieve a safe，efficient and economic operation.
    Research of the Visual Simulation of Mine Water-inrush Based on Improved Dijkstra Algorithm
    ZHOU Yao-Dong, CAO Zhi-Guo, LI Cui-Ping
    2010, 39(10):  123-125,138. 
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    Due to the high risk of water-inrush in mining activity，and based on the research analysis on the process of the mine water-inrush，the process design mode for the target is adopted to establish the visual simulation system for mine water.That is，through the data processing of the tunnel network，the 3D visual system for the disasters of underground tunnel is designed and realized.Then the improved Traversal Algorithm is used for the numerical simulation on the water-inrush process.Finally，the visual display of the tunnel water-inrush process with 3D visual technology by the mode of time series is achieved.After applying in the mine，its validity and reliability is verified.
    Development of a Visual System for Surface Subsidence due to Underground Tunneling
    WEN Lei
    2010, 39(10):  126-128，138. 
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    The ground movement and deformation due to underground mining is an important engineering problem.When the ground deformation surpasses a certain range，the buildings on the ground surface will be destroyed.The prediction on the size and its influence scope of the surface subsidence，dipping，curvature，horizontal movements and horizontal deformation is carried out to determine whether the buildings are affected by the mining and its influencing degree，as a scientific guidance of underground mining.In this paper，visualization of surface movement and deformation is realized with probability integral method as a theoretical basis and Matlab software as the programming platform.Matlab software has lots of advantages with make up the deficiencies of other software in some aspects.This software can offer aid for calculation of surface movement and deformation.
    Foaming Performance of Microporous Foaming Generator
    HUANG Guang-Yao, CHEN Wen, FENG Qi-Ming, 欧Le-Ming
    2010, 39(10):  129-133. 
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    With the digital imaging processing, the bubbles imaging in flotation column were obtained.By adopting the image processing software of Pro Plus 5.0, the size and the diameter distribution of bubbles are calculated, and the effect of mean size and wettability of foaming generator, superficial gas velocity on the size of the bubbles were studied.The results showed that Sauter diameter of the bubbles decreases with the decrease of superficial gas velocity and mean size of foaming generator, and wettability of foaming generator has obvious effect on the size of bubble.Compared with hydrophobic foaming generator, it is easier to produce micro-bubble for hydrophilic foaming generator.The bubbles produced by foaming generator which with smaller pore and hydrophobic material are beneficial for the recovery of fine particles by flotation.
    Study on Grinding and Comminution Model of Roller Press
    LIU Jin-Chao, CHENG Xiang-Wen
    2010, 39(10):  134-138. 
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    In order to study the accuracy of products materials prediction in rolling process, and based on the intersected idea raised by M.Torres due to the uneven stress in the roller surface, the grinding and comminution model of roller press is deeply investigated.The on-site tests are carried out by adopting the equipment in Luanxian crushing plant, and the test data is analyzed.After that, MATLAB software is used to fit the selection function and breakage function model to ascertain all parameters that affect the products granularity of roller press.Then an appropriate selection and breakage function model is obtained.After the axial intersection of roller press, the corresponding model parameters are gained according to the experimental data.
    Application of Energy Scattering X-Ray Fluorescence Spectrometer in Production of Sinter in BenSteel
    ZHU Qing-Hong
    2010, 39(10):  139-141. 
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    The main raw materials demanded by Benxi Iron and iron company are sinters, however the grade level of sintering products and the variation of alkalinity greatly influence the blast furnace process.The paper describes the features of the energy scattering X-ray fluorescence spectrometer in detection of SiO2, CaO, TFe content among sinters, and its detection mechanism.The factors of resulting in error detection are analyzed and the related solutions are  proposed. Through comparison of the data from the energy scattering X-ray fluorescence spectrometer with the assay data, the detection accuracy and rapidity of the instrument have been ensured.
    Discuss on Comprehensive Utilization of Mining Tailings and Development of Pollution-Free Mines
    MEI Guo-Dong
    2010, 39(10):  142-145. 
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    Based on the current total amount and annual output capacity of tailings in China，such problems as risk，pollution，land occupation and resources waste，resulted from tailings stockpiling，are discussed in detail.The necessity of comprehensive utilization of mining tailings and benefit of safety，environment protection，economy，resource saving and social benefit are further emphasized on as well.Therefore，it proposed a new idea of comprehensively utilizing existing tailings and developing pollution-free mines.Some measures for comprehensive utilization，including enhancing the data statistics of tailing utilization，the guidance of policy and financial from government，supporting technology development and industrialization，the establishment of standards on comprehensive utilization，strengthening the propaganda and foreign technical exchange，are proposed.
    Application of the Prediction for Mining Subsidence in Soil Reclamation in Mining Area
    ZHOU Fu-Dan, ZHAO Chang-Sheng, DING Pei, LI Ding-Peng
    2010, 39(10):  146-150. 
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    According to the mining plan of a minefield in Anhui province，the subsidence prediction software-MSPS，which is self-developed，is adopted to predict the mining face.This paper analyzes the subsidence area of coal mining，subside seeper area and the land destruction in the next five years.Also，the amount of fund that should be put for land reclamation in subsidence area is calculated.As a result，it will provide a basis for land reclamation planning and investment in this area.In addition，it has some reference significance for other mining area in the treatment of mining subsidence.
    Numerical Simulation Study on Flow Field Characteristics of Mining Face Spaces
    WANG Jia-Chen, ZHAO Hong-Bao
    2010, 39(10):  151-153,180. 
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    Under the conditions of U-type ventilation，the numerical simulation on the characteristics of flow field，the distribution of methane density and the rule of air density change are studied by numerical simulation software of CFD at the mining face spaces.The simulations show that from intake airflow into roadway，working face and to return airway，the characteristics of airflow field shows to be simple firstly，complex next and simple again.The flow field is the most complex at the crossing of the intake airflow roadway and the return airway; The gas concentration at working face space shows gradually increasing along the airflow direction with larger variety only appearing at local position，and gas concentration along coal wall is higher than that along mining-out area; Under the condition of U-type ventilation，gas can be easily accumulated to be the highest level around the top of intake airflow roadway close to coal wall and the upper corner，and the gas concentration at the upper corner is triangle in shape.
    Preparation of Compounded Adsorption of Phosphorus Removal with Zeolite and its Performance
    LIN Hai, JIA Xiao-Yu, GUO Li-Li
    2010, 39(10):  154-158. 
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    In view of the problems that the high concentration of phosphate remained in secondary effluent, and combining with the related research at home and abroad, adsorption processes were attempted to remove phosphate, which used the  inexpensive natural zeolite as basic materials, the lanthanum ion as inorganic loading ion, loading dose of lanthanum chloride as the inorganic loading dose to compoundly treat Zeolite.After treatment, the removal capacity of phosphate by zeolite reached 83.83 %.The appropriate composite conditions were pH=10, 0.4% of LaCl3 concentration, compound time of 1 h, 200 ℃ of calcined temperature for 1 h.Compared with the power function, Elovich absorption kinetic equation could more clearly describe the absorption mechanism in phosphorus removal process by the composite  adsorbent.Through the contrast analysis by scanning electron microscope, it is shown that in the preparation of composite adsorbent process, the surface morphology and micro-pore size of zeolite and its shape have been changed.
    Safety Assessment and Prediction of the Tailing Pond Based on Fuzzy Hierarchy Analysis and Set Pair Analysis
    YIN Jun, WANG Yu-Jie, 吕Lin , CHEN Xian-Feng
    2010, 39(10):  159-161，188. 
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    With the decision-making requirements of tailing ponds' security management，the index system on the safety assessment and prediction of the tailing pond was set up based on the analysis of the tailing ponds' danger sources.The application of the diversity factor and the set pair potential in tailing ponds' safety assessment and prediction was introduced in detail.The fuzzy hierarchy analysis method and set pair analysis were applied to evaluate and forecast the safe condition of the tailing pond.Then the safety level of the tailing pond was established to reflect the safety management and analyzed the development tendency of safe condition.A new way of combining safety assessment with safety prediction was explored，which can support safe operation and safety management of the tailing pond effectively.
    Application of Dust Control Technology with Foam in Fully Mechanized Workface
    GAO Qing-Cong, WANG De-Ming, WANG He-Tang, REN Wan-Xing, LI Yong-Sheng
    2010, 39(10):  162-164. 
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    Abstract As the dust hazards are severe in the tunneling workface，this paper proposed a new dust control technique with foam in fully mechanized workface based on a systematic analysis on the characteristics of foaming dust control technique.And then it is applied to the E 10-21180 heading face of Pingdingshan Mine.The application results indicated that at the place where the driver is in，the efficiency of total dust control with form is up to 87.90%，which is 2.10 times as the water spray did.The efficiency of the respirable dust control is 75.97%，2.37 times as the water spray did.It has a remarkable control effect which can effectively control the dust hazard.
    Study on Absorption of Cu2+ by Magnetic Separation's Tailings of Converter Sludge
    LUO Li-Qun, LI Ming-Hui, WANG Tao, LIU Lin-Fa
    2010, 39(10):  165-168. 
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    The absorption effect and absorption behavior of tailings of magnetic separation of converter sludge as test samples on copper ion were investigated.The results show that removal rate of Cu2+ can reach 97.86%, companying with the suitable conditions, that is, the tailings of magnetic separation of converter sludge of 8.0 g/L in dosage, concentration of Cu2+ of 20 mg/L and the reaction time 50 min.The importance of adsorption factors are shown as follows：the dosage of tailings > initial concentration of copper ion solution> reaction time.The adsorption reaction mainly consists of the surface  dsorption with somewhat replacement reaction accompanied.
    Study on the As(Ⅲ) Removal by Magnesium Hydroxide in Wastewater Treatment
    YANG Jin-Hui, WANG Jin-Song, CHEN Si-Guang, DU Xin, DENG Qin-Wen
    2010, 39(10):  169-171. 
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    Through the tests on the As3+ wastewater treatment for As(Ⅲ) removal by magnesium hydroxide, the effects of reaction time, magnesium dosage, pH value and temperature on As(Ⅲ) removal were explored.The experimental results showed that magnesium hydroxide had an excellent performance in the removal of As(Ⅲ) ions from As3+ wastewater with easy operation and a high removal efficiency（up to 99% above).Its absorption isotherm mode matches well with Langmuir adsorption isotherm function,and its maximum adsorption capacity is 4.04 mg/L.
    Recommendations on the Safety Management of Metal and Nonmetal Open-pit Slope
    LI Jun
    2010, 39(10):  172-175. 
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    In China，metal and nonmetal open-pit mining occupies a huge proportion.But about half of them have been deformed or destroyed.Due to some hazards like high slope and landslides，it has become the big disaster that endangered the mine safety production and the people's lives and property.Low management level and technique of metal and non-metal open pit slope is one of the most important factors that lead to the accidents in recent years.So the slope management is particularly important.According to the problems and trends of metal and nonmetal open pit slope in China，the recommendations on open pit slope management of metal and nonmetal mine for supervision department and mining enterprise are proposed.
    Study on the Preparation of Polymeric Aluminum Ferric Sulfate with Bauxite Flotation Tailings
    HUANG Zi-Li, CHEN Zhi-Hua
    2010, 39(10):  176-180. 
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    A Bauxite Flotation Tailings was roasted at 600 ℃ for 3 h，then leached in sulfuric acid of concentration 45% at 100 ℃ for 3 h with a liquid-to-solid ratio of 5∶，and the leaching rates of Aluminum and Ferric reached 61.65% and 94.10% respectively.The product of liquid Polymeric Aluminum Ferric Sulfate which was prepared with the leaching solution by adding proper amount of ferrous sulfate and hydrogen peroxide accorded with the national standard.The coagulation tests results for different kinds of water indicated that the product was very efficient to the removal of turbidity and suspended substance.
    Study on the Application of Swirl Injection Flotation Column in the Ni-Recovery of Copper-Nickel Tailings
    CHENG Yu, SONG Yong-Sheng
    2010, 39(10):  181-184. 
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    The recovery and utilization of tailings is attracting more and more attention in modern society.In view of large capacity of copper-nickel mine tailings drainage every year in a fine-grained single nickel-based feature，the Swirl Injection Flotation Column was used to do the re-concentration test in laboratory firstly.Then，based on the laboratory tests，the industrial test is made.A nickel concentrate grading 2.78% at a recovery of 14.86% and MgO grading below 8.25% were obtained from the production tailings which have 0.23% Ni by the process consisting of one roughing，one scavenging and three cleanings.
    Recycling Utilization of the Cooper Tailing Resources in China
    GUAN Hong-Yan, XU Li-Hua, ZHOU Bing, LI Xing-Wang, REN Ling, DI Wei
    2010, 39(10):  185-188. 
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    With the depletion of high grade copper mineral resources，it has become very urgent to develop the discarded copper tailings.In this paper，the status of copper tailings in our country is described briefly and the recent advances on the processing way of copper tailings are introduced.Based on the analysis for the main developing technical routes of the copper tailings resource，the inorganic wet chemical beneficiation process which is the way to separate and enrich the valuable metal ions at different acidity efficiently from the tailings as the most promising way has been proposed.