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    13 December 2011, Volume 40 Issue 12
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    ′2010 Annual Review of Mineral Processing in China
    WEI De-Zhou, MI Jin-Yue, LIU Wen-Gang, GAO Shu-Ling
    2011, 40(12):  1-12. 
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    Chinese researchers who endeavor in mineral processing take rational exploitation, comprehensive utilization and mining circulation way of mineral resources as the ultimate goal all along in 2010.A great deal of research work has been carried out in such aspects as mineral processing technology, beneficiation reagent, dressing equipment, microorganism technology used in mineral processing and tailings disposal.Outstanding advances have been achieved especially in improving the efficiency of crushing-grinding process, optimizing the mineral processing technology, beneficiation process of refractory ores, preparation and application of new-typed reagents and comprehensive utilization of tailings.The existing problem is lacking of deeply research on adsorption mechanism of floatation reagent and new type dressing equipment.
    Numerical Study on Caving State of Overlying Rock and Orebody by Caving Method
    LI Lian-Chong, TANG Chun-An, Cai Ming
    2011, 40(12):  13-17. 
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    The caving of overlying rock and orebody，and associated ground surface subsidence is a complex issue involving time and space.Based on the project of “Modelling Block Caving to Surface” proposed by CEMI，numerical investigations were conducted on the caving state and ground surface subsidence involving deep and large-scale caving.The evolution of pressure equilibrium arch and the fracturing process in rock mass were numerically obtained.It is shown that evolution of pressure equilibrium arch is the triger of caving with intermission and jump.The break angle，fracture initiation angle and associated ground surface subsidence are all depended on the caving state of overlying rock and orebody.
    Residual Ore Mining Program Based on FLAC3D Stability Analysis
    DENG Hong-Wei, GUO Wang, ZHOU Ke-Ping, DU Xiang-Hui
    2011, 40(12):  18-21. 
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    In order to maximized the recovery rate of high grade copper pillar in the Hongtoushan copper mine shallow middle segment，took residual ore in -47 m middle segment as study object，established the three-dimensional model of remnant by 3D Mine，combined with the morphology and occurrence conditions of residual ore，proposed a economy reasonable and technically feasible solution residual ore mining program，simulated and analyzed the horizontal displacement and the minimum principal stress of pillars during residual ore mining by MIDAS/GTS and FLAC3D.The analyses show most pillars are safety and reliability in the mining process，except 1#、9-1#、9-2# and 10# pillars have a great horizontal displacement in the simulation which should recovery under a certain security measures or keep as permanent.
    Experimental Study of Drillablity on Rock of Barun Iron Mine
    LIU Zhan-Quan, WANG De-Sheng, ZHENG Jian-Jun
    2011, 40(12):  22-25. 
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    Drillability classification has not yet uniform，there are various methods for different targets，and more popular methods are fit to sedimentary rocks on the petroleum industry，but not suitable for metal mines.contrary to complex distribution of rock and ore in Barun Iron Mine，sampling of the igneous samples were representative of a wide range.with precision instruments，a comprehensive physical and mechanical properties are test，and drilling speed of cone drill at site is tested in a variety of rock mass.The results show that the drilling speed of the ore and rock can be physical and mechanical properties with good correlation in Barun Iron Mine.
    Practice of Mining Under the Pressure Water of Quaternary System Layer in Gushan Open-pit Mine
    DENG Pei-Di, WANG Zhang
    2011, 40(12):  26-29. 
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    Combined with technical measures of drainage control of the upper strata and within closed loop, of Quaternary system slope stripping and of bedrock controlled blasting,  the embedded control two-shot grouting curtain technology is introduced to stop the pressure water of the grit scree of Quaternary system layer overlying iron ore.By using this technology, the problem of mining under the pressure water of Quaternary system layer in open pit mine has successfully been resolved.
    Two Dimensional Numerical Simulation of Slope Seepage with Flow-rock Coupling Effect
    XU Wen-Yao, LI De-Hong, WANG Xiang-Gui
    2011, 40(12):  30-34. 
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    To investigate the influence of seepage and flow-rock mass coupling effect on slope stability, the equivalent continuum model was firstly introduced based on geological conditions, then the infinite element method was used to solve the model.Finally, the software SEEP/W was adopted to simulate the underground seepage under the conditions of normal water level, rainfall infiltration and drainage.The results show that the equivalent continuum model is reliability, and the two dimensional seepage is inhomogeneous with axial hydraulic gradient greater than radial gradient.Three modes indicate that hydraulic gradient is evident within the slope surface, intersections of different stratums and mixed rock mass Ⅰ.In addition, the rainfall infiltration results in tensile stress increase and fracture enlargement, shearing and slippage is the main inducement mechanism for slope instability, whereas drainage is efficient to improve the slope safety.
    Open Pit Optimization with Various Changeable Factors
    HUANG Yong, HU Qing-Xiong, ZHAO Xing-Kuan
    2011, 40(12):  35-38. 
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    During pit production, the change of factors such as operating cost, processing recovery and product price will have an obvious effect on pit optimization.Simple model and complex model with various changeable factors were established, base on the optimization results with different price cases, it shows that the optimized pit of complex model is more accurate.The change of various factors will be dynamically and accurately reflected on pit optimization in complex model which has a promising prospect during actual pit operation.
    Model Test and Numerical Simulation for Directional Pressure Relief Blasting
    ZHOU Hui-Qi, XIAO Ding-Jun, SHAO Xing-Long, YANG Juan, YANG Chao-Jun, YU Ke
    2011, 40(12):  39-43. 
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    The cement mortar model tests on the directional pressure relief blasting were carried out to make ultra dynamic strain tests from three directions of protecting borehole wall，free-face wall and bottom wall.Three-dimensional numerical simulation and numerical calculation of tests were made by using ANSYS/LS-DYNA software.The pressure value and the tests results with the same distance from explosives to borehole wall，free-face wall and underside wall were compared，the distribution of pressure was analyzed and the blast hole pressure relief effect by protecting borehole wall materials and bottom interval air column is explicated.The present results indicate that there is an obvious stress concentration phenomenon at one side of the free-face wall，is the same distance apart from the explosive center.The pressure at protecting borehole wall is lowered by the average 26% than that of the free-face wall，where the vibration isolation material，PVCU，plays a good directional protection.Air column at blast-hole greatly affects the pressure，and has a strong pressure relief function.The simulation results were in good agreement with the experimental date.
    Tunneling and Supporting Technology of Mining Roadway Under Complex Conditions in Dingji Coal Mine
    XU You-Quan, JIA Shang-Kun
    2011, 40(12):  44-46. 
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    Problems existed great depth，obvious ground pressure，joints development in coal roof，water drenching in part of the roof，high temperature in Dingji Coal Mine.The creep characteristics of roadways surrounding rock is obvious.It's difficult to tunnel and support the roadway because of the complex geological conditions.In order to realize the tunneling and supporting of mining roadway under complex conditions in Dingji Coal Mine，with the research object of conveyance road in 1141(3)working face，the method of tunneling and supporting the mine roadway was summarized，which is suitable for the specific conditions.It was obtained that the supporting of roadway tunneling and supporting should be based on the geological conditions，The remarkable technical and economic benefits can be achieved with appropriate method and strict construction based on requirement finally.
    Mechanical Analysis of Roof Based on the Thin Plate Model on Viscoelastic Foundation
    KANG Ya-Ming, JIA Yan
    2011, 40(12):  47-50. 
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    The model of the main roof was treated as the thin plate model，according to the principle of the minimum potential energy of the elasticity，the displacement of the roof based on the thin plate model laid on the Winkler foundation was obtained.The immediate roof and coal which support the main roof were regarded as viscoelastic foundation，the model of the foundation was the Generalized Kelvin-Voigt model，on the basis of the analytic results which based on the plate on the elastic foundation，according to elastic-viscoelastic theory，then the analytic solutions of the displacement and the stress of the roof based on the plate on viscoelastic foundation were got by Laplace transform method，provided theoretical basis for analyzing the stability of the roof and forecasting the subsiden ce of the old mine goaf area.
    Research on Remnant Ore Mining Over Collapse Borderline in Meishan Iron Mine
    LIU Pei-Zheng, YE Zhen-Hua, ZHANG Chuan-Xin
    2011, 40(12):  51-55. 
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    Aim at the condition of mining over collapse borderline in Meishan Iron Mine, and base on the natural equilibrious arch theory with computer simulation technology, this article study on preferences of sublevel open-stope succeed by fill and bottom structure of stope disposition, as well as the technics characteristic of this mining method, analyzed wall rock stress and displacement variation rule and plastic zone distribution, educed the roof terrane tensile stress is the key factor of effect stope stability.Then, use the index of maximum tensile stress of roof terrane bear ability to scale the stope stability, and optimized the stope structure parameters by orthogonal test.At the last, this study gained the parameters of 14m room stope width, 10m pillar stope width and 8m roof thickness can satisfy the mining over collapse borderline in Meishan Iron Mine.
    Study on Beneficiation Process of A Fine Low-grade Hematite Iron Ore from Inner Mongolia
    HE Yang, WANG Hua-Jun, SUN Ti-Chang, LI Hong-Jing
    2011, 40(12):  56-59. 
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    In order to provide the development and utilization technical basis on a fine low-grade hematite iron from Inner Mongolia, a experimental was carried out by high intensity magnetic separation-reverse flotation process, high intensity magnetic separation-flotation process and the deep reduction-weak magnetic separation process. The results showe that: high intensity magnetic separation-flotation separation process cannot achieve ideal result, but through the test of deep reduction-low intensity magnetic separation, in the condition of coal consumption 30%, resistant reducing agent CCO 15%, roasting temperature at 1 200 ℃ for 90 min, a concentrate of the Fe content of 91.44%, with the Fe recovery of 91.22% is produced. The mechanisms of CCO were also investigated by XRD and SEM. The results show that CCO can promote the wustite reduce to metallic iron and inhibit the formation of fayalite and play a role of desulfurization.
    Grinding and Separating Performance Comparison of Vanadium Tiano-magnetite Crushed with Different Process from Pangang Group
    LONG Yun-Bo, ZHANG Yu-Shu, ZHANG Shao-Xiang, ZHOU Man-Geng
    2011, 40(12):  60-62. 
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    In order to validate the superiority in crushing vanadium tiano-magnetite from Pangang by using high pressure rolling process, vanadium tiano-magnetite from Baima and Midi regions which were crushed with high pressure rolling process with crushed fineness of -5 mm and conventional crushing process with crushed fineness of -3 mm, grinding and separating experiments have carried out. The research results show that：high pressure rolling process compared with conventional crushing process, the former have obvious advantages in size composition and degree of mineral liberation, as well as in influence on subsequent iron mine grinding and separating.
    Research on Segmented Oxidation Leaching New Process for Navajoite Ore of Carbonaceous Shale
    CHEN Wen-Xiang, HE Jian-Lian, HU Wan-Ming, WANG Bing, YU Hong-Lin, DI Yong-Ning
    2011, 40(12):  63-66. 
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    In order to develop and utilize the mineral resources of navajoite of carbonaceous shale and protect the ecological environment effectively, the new process of segmented oxidation leaching for distill vanadium from navajoite of carbonaceous shale is presented, and the leaching experiment of a navajoite ore of carbonaceous shale in Guizhou was carried out.The experiment results show that：the ore grinding fineness is 70% -0.15 mm, in the first stage leaching, the quantity of 1# reagent is 15% of the ore amount, the liquid-solid ratio is 0.75∶1, the leaching temperature is 80 ℃, the leaching time is 3 h, In the second stage leaching, the quantity of 2# reagent is 3% of the ore amount, the quantity of sodium chlorate is 1% of ore amount, the liquid-solid ratio is 1∶1, the leaching temperature is 80 ℃, the leaching time is 4 h, the vanadium leaching rate can be up to 91.52%.The original ore does not need to roast in this new process, the process flow is simple, the dosage of reagents is lower, the leaching time is shorter, the vanadium leaching rate is higher, and the problems of environmental pollution and resources-wasting in roasting navajoite leaching vanadium process could be avoided.
    Experimental Research on Bacterial Oxidation of Pyrite in High Sulfur Bauxite
    ZHOU Ji-Kui, LI Hua-Xia
    2011, 40(12):  67-69. 
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    Three strains of Thiobacillus ferrooxidans which are obtained from the high sulfur coal mine are used to the bacterial oxidation leaching and desulfurization research on a high sulfur bauxite from Chongqing.Under the suitable conditions, the desulfurization degree are in excess of 74%, the desulfurization degree of SX-1# bacteria reaches to 83.57%, the content of sulfur of bauxite decreases from 3.83% before bacterial oxidation leaching to 0.69%, and reach to the demand of the content of sulfur of bauxite by bayer process producing alumina.The experimental results show that the biological oxidation technology of pyrite is useful for removing the sulfur from the bauxite.
    Research on Beneficiation Process for Certain Fine-grained Refractory Gold Ore
    PENG Gui-Xiong, LI Guo-Dong, LIAO Xue-Zhen, LU Lin
    2011, 40(12):  70-73. 
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    In the light of the fine-grained and disseminated gold ore property, the gold mineral from the ore is recovered by flotation with our high efficient T101 as dispersant and D3 as collector.Under the fully dispersing pulp and improving gold collector conditions, when the crude ore contains gold 4.14 g/t, the technical indexes such as the grade of gold concentrate 41.76 g/t and the recovery 89.21% are obtained by one time roughing, one time scavenging and the rougher concentrate two times cleaning after secondary grinding.The research provides scientific technique support for effective use of gold ore.
    Study on the Process Mineralogy of Oxidized Ore from Yuanjiacun Iron Mine
    HU Yi-Ming
    2011, 40(12):  74-77. 
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    Systematically analyze the mineral composition, iron content and phase distribution of three kinds of oxidized ore from Yuanjiacun iron mine（quartz type oxide ore, quartz type mirror iron ore and flash stone type oxide ore).Meanwhile, study in detail the process characteristics of its main iron minerals：magnetite, half an illusion hematite-martite,hematite-specularite and limonite,including mineral dissemination, symbiotic relationship, texture and structure, etc.These supply the basic data and theoretical gist for studying the dressing process of Yuanjiacun oxidized ore.
    Study Status of Flotation Technology and High Effective Flotation Columns for Fine Mineral
    ZHAO Pei-Pei, CAO Yi-Jun
    2011, 40(12):  78-81. 
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    On the basis of analyzing the property of fine mineral flotation, some flotation technologies for fine mineral which are used widely in recent years are briefly described, such as, carrier flotation, agglomerate flotation, biological flotation, comprehensive force-field flotation etc; and three kinds of high effective flotation columns for fine mineral, Jameson flotation column, packed flotation column, and cyclonic-static microbubble flotation column, are introduced.Finally, the future study direction of flotation technology for fine mineral is prospected.
    Research Progress of Mineral Processing Technolog of Copper Oxide Ore
    QIU Ting-Sheng, ZHENG Xi-Lian, FENG Jin-Ni
    2011, 40(12):  82-86. 
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    Research progress of mineral processing technolog of copper oxide ore was introduced from three facts：floatation（theory and technology were include）,leaching（conventional leaching, aid leaching methods and leaching theory）and flotation-leaching joint method.Point out the enhanced leaching will be an important research direction of separating copper oxide ore.
    Progress of Mineral Processing for Wolframine
    LUO Xian-Ping, LU Yong-Sen, ZHANG Jian-Chao, QIAN You-Jun, SHEN Yuan-Hai, LIANG Chang-Li
    2011, 40(12):  87-90. 
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    Summarizes the prospect of mineral processing for wolframine：the mineral processing of coarse wolframine based on gravity concentration；the wolframine of fine particle going by repeated revise and develop，forms the combined technology of integrating gravity separation，magnetic separation and flotation separation. On the basis of summary，the text reveals the existing problems and shortage of every processing，clarifying the development aspect of mineral processing about wolframine.
    Geological Characteristics and Ore Prospecting of Nanfen Iron Deposits，Liaoning
    ZHANG Peng, Qiao-Shu-Yan, YANG Hong-Zhi
    2011, 40(12):  91-93. 
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    On the basis of previous studies,combinationed with the actual geological survey,analysised geological chacteristics，metallogenic background of Nanfen iron mine，genetic type and prospecting indicators has briefly been studied.By magnetic measurements and drilling verification, it is proved that iron deposit has big resource potential and carrying out breakthrough of iron mine exploration is very possible.
    Geological and Metallogenic Characteristics of Kalakulumu Complex Body in West Kunlun
    HUANG Jian-Guo, YANG Rui-Dong, ZHANG Xiong, PAN Jun-Li, SUN Ji-Hua
    2011, 40(12):  94-97. 
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    By analyzing Kalakulumu complex rock mass's lithofacies，rocks and minerals，petrochemistry and REE，illustrated that the rock mass has special formation environment，characteristics of complex lithology，deformation and metamorphism strongly，it belongs to a multiple complex rock mass.The main cause of the rock mass is crust melted type or crust-mantle mixed type.The contact zone's strata which located in edge of the rock mass distributed several polymetallic deposits (mine points).There is a certain genetic relationship which contains time and space between polymetallic ore formation and complex rock mass.Complex rock mass may provide a source of ore materials for the formation of some minerals.
    Key Technology of Mine Geography Information System by Internet of Things
    CHEN Guo-Liang, WANG Yun-Jia, GU He-He
    2011, 40(12):  98-101. 
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    Based on mining internet of things current situation，the paper analysis wireless real-time positioning technology and UDP communication protocol，design four layers structure and network plan of mine GIS monitor system，develop underground real-time positioning function for miners and facilities by .Net platform，realize remote monitoring management of mine resource exploitation.
    Haul Trucks 3D Assisted Driving and Proximity Warning System in Mines
    SUN 恩Ji, ZHANG Xing-Kai, LI Zhong-Xue, WANG Yun-Hai
    2011, 40(12):  102-109. 
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    Haul trucks transportation is one of the most important transportation methods in large surface mining operations.It is the key factor that affects the mining productivity and cost effective, however, its accidents rate and the dangers are far higher than other types of developing transportation surface mining accidents.The haul truck blind spots distributions and their resulting safety risks were analyzed.To avoid the haul trucks collisions accidents for the drivers do not have reliable transportation information, the 3D digital map customization and 3D trucks modeling technologies were used.A novel Haul trucks 3D assisted driving and proximity warning system based on the GPS, mesh-wireless networks, and the GE COM API 3D graphical engine to advance the mine haul trucks operating safety and provide real-time 3D driver assistance and guide information in surface mining.The research results indicate that it increases reliability and reduces uncertainty for the haul trucks driver in surface mining operations.
    Study on DC Promotion Based on Double PLC and 6RA70
    JI Jian-Ping, ZHAO Ai-Ming, SUN Hai-Jun
    2011, 40(12):  110-112. 
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    Direct at the fact that mine elevator system adopts full digital drivetrain system, based on the research of SMOREG DC Master 6RA70 series digital DC speed control device of Siemens company, this thesis introduced the structure of the auxiliary shaft system, provided diagram of full digital drivetrain system，analyzed the realization of double PLC control system, expounded the function of the upper monitoring software based on WinCC, gave and analyzed the measured wave.
    Research on Underground Transportation Simulation Model Based on Agent Technology
    LI Xin, LI Zhong-Xue, LI Cui-Ping
    2011, 40(12):  113-116. 
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    Through deep analysis on the process of underground transportation，according to the characteristics of underground transportation，agent intelligent simulation technology was used to the model of underground mining transportation simulation，which made the result more close to the reality.Through the analysis and classification to the underground transportation and lifting，the process was decomposed into a series of discrete event.A Petri net model was established and every link of transportation was set an agent object which made the simulation more comprehensive and real.
    Method of Fast Realization and Application of Remote Virtual Instrument in Microseismic Monitoring
    ZHAO Xian, WU Jian-Xing
    2011, 40(12):  117-119. 
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    For the development needs of data acquisition of the microseismic monitoring，a LabVIEW development platform based on TCP/IP network port of remote data acquisition system program was presented.Designed a data acquisition card for the ARM core，hardware and related software，enabling the system to complete the real-time collection and monitoring，high-speed data storage,remote transmission control，display and spectrum analysis capabilities after the micro seismic monitoring applications，the results show that the accuracy and the stability of the system are high，simultaneously parameters can be adjusted on line during the measurement process and it's easy to have a maintenance and to achieve functional expansion，this system works fast and reliable.
    Profibus DP Communication Realization of Mine Underground Relay Protection Monitoring System
    LUO Jin-Sheng
    2011, 40(12):  120-122. 
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    In order to achieve the telemetry, remote signal, remote control, remote adjustment functional requirements of mine underground relay protection monitoring system, design the underground network communication of the system.In accordance with the requirements of power system communications, design Profibus-DP bus architecture.According to profibus DP Bus communication protocol, we give the system software design.We give the structure of the entire underground monitoring system, the system's hardware architecture and software.
    Test of Magnetic Cyclone Separator Separating Material Sifted Through the Fine Screen in Dashihe Concentrator
    WANG Zhi-Wei, MA Jin-Ting, SHI Pei-Wei, WANG Xiao-Ming, WEI Hong-Gang
    2011, 40(12):  123-126. 
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    Magnetic cyclone separator is a new equipment and developed for magnetite reconcentration, it is characterized by the use of vertical rotating magnetic system with spiral arrangement of magnet poles and rotational inner cylinder which rotation direction is opposite to the system, they can form a compound force field consist of magnetic force, centrifugal force, rising water force, gravity and other forces, thereby, it is beneficial to separate the gangue and deficient accrete body from concentrate efficiently.The semi-industrial test with the equipment is complicated in Dashihe concentrator base on laboratory tests, the result show margin of grad increased and recovery is respectively 1.22%, 2.01% higher than complex glittering magnetic field concentrating machine.
    Research of Sliding Force Warning Model Based on Remote Real-Time Monitor Landslide System
    CHEN Xiao-Gang, TAO Zhi-Gang, GUI Yang, ZHANG Zhao
    2011, 40(12):  127-131. 
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    Sliding force greater than sliding resistance is sufficient and necessary condition of the landslide，based on this warning principle，a landslide remote real-time monitoring and prediction system is developed，and it has important meaning in forecasting and warning geological dirsasters of landslide。Based on the landslide dynamic simulation and indoor physical model experiment，the landslide warning model is preliminarily determined。And the system are applied and researched in Pingzhuang open coal mine，west-east gas transmitting pipeline project（Yan'an section），NaFen open iron mine and ShuoZhou open-underground coal mine，which has proved sufficiently the landslide warning model.Results show that the field warning model of landslide sliding force monitoring curves is consistent with the inferred model of indoor physical model experiment.Thus，this kind of warning model can be used to continue to analyze and judge the stability in the other slip mass，and make accurate warning and forecasting ahead of landslide.
    The Impact of Pre-split Cutting of Stope Roof to the Surrounding Rock Control
    FENG Ying-Hua, LIU Zeng-Hui
    2011, 40(12):  132-134. 
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    By analyzing the impact of the pre-split cutting of key stratum to big structure of laneway surrounding rock and the structure of stope roof，the pre-split can change the fixation boundary of stope roof surrounding rock into the hinged joints boundary.This shortens the transform process of the boundary of the roof board.The pre-split breaks the roof board continuity，and lowers the supporting stress of stope laneway side.Short cantilever beam transfers the part of load from upper strata into the depth to reduce the plastic yield scope of surrounding rock in stope laneway.Therefore the pre-split cutting of stope roof can weaken the boundary restriction of stope roof and control the fracture function of surrounding rock.
    Research on Internal Deformation Monitoring of Tailings Dam by Spring-fiber
    QIAN Fei, YANG Yi-Qing
    2011, 40(12):  135-138. 
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    An spring-fiber sensor based on optical time domain reflectometry was studyed in this paper.A formula about the deformation monitoring of spring-fiber sensor was obtained through the analysis of sensor design experiments.And through the application test of structural monitoring deformation,a correction of the formula was advanced，And it provided a reference of internal deformation monitoring in tailings dam by spring-fiber.
    Analysis on Ergonomics Engineering Reliability About Underground Ventilation System of Metal Mine
    LI Hai-Gang, TANG Min-Kang, HUANG Tong-Lin
    2011, 40(12):  139-142. 
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    With the use of reliability-engineering and ergonomics theory, combined with mining-processing technology, the composition of the mine ventilation system and its characteristics, various factors which can impact the reliability of a mine ventilation system have been approached in detail.It indicates that the main factors which will impact the reliability of the mine ventilation network are the mine ventilation system, the harmful diagonal structure of the network and changes in ventilation network. The main factors which will impact the normal operation of the fan are the types of the fan, its inherent quality, installation, use and maintenance management, the placement environment of equipment, equipment operators, and the method of operation of the main fan. The effectiveness of mine ventilation control equipment changes the resistance in the network branch roadway, which will have a major impact on the system's reliability; the main underground mining process, such as haulage and hoisting, ore-pass draw, underground blasting and other activities, will cause a serious disturbance of air-flow to the mine ventilation system.
    Research and Application on Filling Areas Leak Prevention Technology of Paste-Like Filling
    LI Yang-Yang, JIANG Ning, JIANG Xing-Yuan, JIANG Xia
    2011, 40(12):  143-144. 
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    Stoping with paste filling technology to mine is used in 2351 working face of Daizhuang coal mine.For solving mortar leakage problem on the filling process，we put forward the view of setting up separating wall in filling areas and using gangue backfill paste of higher concentration and large grains in size to block the leakage，which has achieved good performance in the pratical application.
    Reconcentration Test of Magnetic Concentrate of A Pyrite Tailings for Separation of Magnetite and Pyrrhotite
    YE Jun-Jian, ZHANG Qin, ZHOU Ying, JIANG Mao, LI Xian-Hai
    2011, 40(12):  145-147. 
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    In order to make pyrite tailings fully used, an experiment was studied on the reconcertration of magnetic concentrate of pyrite tailings in which iron and sulfur were mainly hosted in magnetic and pyrrhotite.The results showed that there was a good separation effect of iron and sulfur by the process of flotation-low intensity magnetic separation-roasting.Flotation of original magnetic concentrate yielded pyrite concentrate with sulfur grade of 31.08%, and recovery level of 82.91%.Floatatien tailings after being low intensity magnetic separation and roasting could get the  iron concentrate with 62.61%TFe，0.21%S，3.87% SiO2 and  with 31.03% iron recovery to original magnetic concentrate.The sulfur concentrations were roasted in the conditions of simulatively making sulfuric acid, and produced pyrite cinder contained 61.08%TFe, 0.23%S, 5.09% SiO2, which could be used as iron concentrations.
    Study On Red Mud As Modifier of Slag Cementing Materials
    TIAN Ming-Yang, NI Wen, ZHANG Yu-Yan, LI De-Zhong
    2011, 40(12):  148-150. 
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    First,add red mud to the slag cementing materials as modifier which is consist of slag, gypsum and cement clinker, then study the compression strength influence of red mud dosage, and analyze the microstructure of the gelled material by SEM.The test result shows that with the increase of red mud dosage, compression strength first increased, then decreased, and got a optimum at the red mud dosage of 6%（the ratio of the other elements was slag 74%, gypsum 10%, cement clinker 10%, while PC 0.3% of the total amount of the raw materials）, and in this situation, the gelled material can get compression strength of 61.93, 70.53, 81.02 MPa each on 3, 7 and 28 d.Hydration products of the gelled material mainly include C-S-H gel and ettringite; and with the increase of reaction time, the cover areas of C-S-H gel add continually, and ettringite interlace with each other closely, which show hydration processes tend to be completely.
    Process Mineralogy of Tailings of Separating Iron from Red Mud of Bayer Process
    LIANG Dong-Yun, HONG Qiu-Yang
    2011, 40(12):  151-153. 
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    The material and size composition of tailings of separating Fe from red mud of bayer process was detailedly studied, focusing on the occurrence of the valuable metals such as Al, Ti, REE, Sc, Ga, etc.The results show that 46.08% of Al2O3 exists in the form of diasporite and gibbsite minerals and more than 90% of the minerals are larger than 0.005 mm which can be recovered by floatation.The Ti, REE, Sc and Ga should be extracted by hydrometallurgy for their micro-fine dissemination size.This study provides detailed data and theoretical basis for the comprehensive utilization of the tailings of separating Fe from red mud of bayer process.
    Experiment on Improving the Quality of Fill Mining
    LI Quan-Jing, YIN Yu
    2011, 40(12):  154-156. 
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    Introduced the tails of one iron mine cemented filling process and the tails characteristic，have carried on the cemented filling laboratory structural testing and the commercial test，carries on the narration to the tails cemented filling quality.Based on this，has analyzed the influence cemented filling quality factor，elaborated the ways to improve the quality of mine filling and measures to guide the practice of mining product in this mine.