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Table of Content

    15 July 2009, Volume 39 Issue 07
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    Current State and Existing Problems of Tailing Leaching Technology
    WU Ai-Xiang, WANG Shao-Yong, WANG Hong-Jiang
    2009, 39(07):  1-4. 
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    Based on the current state of China's tailings resources and their comprehensive utilization, the paper highlights the heap-leaching process development of our country, particularly the current state and progress in tailing leaching process, and cites its domestic and foreign industrial application cases.The paper also analyzes the advantages and disadvantages of tailing leaching processes, proposes a new thinking of tailing reservoir leaching, points out the problems in tailing reservoir leaching technology, and forecasts its future development.
    Study on the Criteria for the Rheological Fracture and Spontaneous Caving of  Jointed Rock Mass under Inducement Conditions
    YUAN Hai-Ping, WANG Jin-An, ZHAO Kui
    2009, 39(07):  5-9+42. 
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    The paper studies in-depth the rheological fracture of jointed rock mass under inducement conditions, summarizes the three different destruction mechanism of rheological fracture, and determines to use the branch crack propagation length as a unified criterion for the three destruction mechanisms in judging jointed rock mass destruction.On this basis, the paper proposes for the first time that the three requirements for a spontaneous caving of jointed rock mass under gravity be destruction conditions, free face conditions and equilibrium conditions, and deduces and establishes the criterion mathematical expression for the rheological fracture and spontaneous caving of jointed rock mass.The study results are then turned into a computer program, providing a new efficient method for the study of spontaneous caving law and the forecast caving speed forecast of rock mass of rheological fracture type.
    Optimal Selection of the Mining Method Based on Grey Relational Method
    WANG Xin-Min, XIE Sheng-Qing, ZHAO Bin, ZHANG Qin-Li
    2009, 39(07):  10-12+32. 
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    Grey relational analysis was used in the optimal selection of three mining methods proposed for Xinqiao Pyrite Mine.The factors influencing the mining method were classified into four categories: economic indicators, safety indicators, resource utilization rate and technical indicators.The relational degrees of the three mining methods were found to be 0.865, 0.75 and 0.712 and as a result, the 1st method was selected, which was upward horizontal slicing-cemented filling method.The mine practice shows that grey relational theory can well select the mining method and obtain a more scientific analysis result.
    Research of the Application of Total Tailing High Density  Backfilling Technology in Deep Underground Mine
    LI Dong-Qing, YANG Cheng-Xiang, SHI Shi-Hu
    2009, 39(07):  13-15+23. 
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    The paper presents the backfilling technology of high density total tailings prepared by a new type vertical sand silo.Extremely fine total tailings are directly prepared into high density slurry by a special vertical sand silo using slurry making technology with rationally controlled pressure for assisting the tailing flow.Control Cement and other auxiliary materials are added into the tailings in the proportion as test specified, which are fully agitated and adjusted to the required density.High density total tailings thus prepared or cemented total tailings are transported to the deep underground mined-out area by gravity.The technology can effectively control the geopressure of the stoping area so as to realize a safe and efficient deep mining.It can be widely used in mining-backfilling mines, laying a foundation for non-waste mining and being of enormous significance to promoting and transforming the mining process of metal mines.
    Mechanism Analysis and Numerical Simulation of the Blast Failure Modes of Jointed Rock Masses
    ZHANG Li-Min, 吕Shu-Ran, LIU Hong-Yan
    2009, 39(07):  16-19. 
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    The existence of the joints is an important characteristic of rock mass distinctly different from rock, and also an important factor leading to the heterogeneousness and anisotropy of rock mass.On the basis of the analysis of the mechanism of blast failure mode of rock mass affected by joints, a new numerical method, or numerical manifold method, which can perfectly simulate the joint distribution in rock mass and the occurrence and propagation of cracks, is adopted to simulate the failure process of three rock masses with such joints as no joints, averagely distributed horizontal joints or averagely distributed vertical joints respectively under the blast impact load perpendicular to the circumference.From the simulation results, it can be evidently seen that the existence of the joints plays a vital role in controlling the failure form of rock mass.The failure form of the intact rock mass has good symmetry, while for rock masses with horizontal joints or vertical joints, their failure forms are controlled by the distribution of the joints to large extent.
    Study on the Mining Sequence of Deep-Buried Orebodies
    LIU Wei, CHEN Yong
    2009, 39(07):  20-23. 
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    With the increasing mining depth, the geopressure-caused problems are increasing, mainly including roof caving, wall falling and rockburst.In view of these, the paper studies the staged mining sequence of deep-buried orebodies, simulates with 2D-σ program two different staged mining sequences, and analyzes their stress field and displacement fields.The simulation result indicates that the upward mining can better improve the stress and displacement so as to weaken the roof caving and wall falling in deep mining.
    Exploring the Treatment Technology for Open Mined-out Area
    ZHANG Dong-Fang
    2009, 39(07):  24-26+76. 
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    The open-pit mining safety was threatened by the large amount of mined-out area under Sandaozhuan Open Pit Mine, Luoyang Molybdenum Group.The mined-out areas were classified and analyzed and different treatment processes were used for them respectively.For example, long and medium hole explosion and long hole explosion were used for different areas for 145 times, which involved a mined-out area of 116.3hm2 and a volume of 13.392 million  m3.This technical method has effectively solved the problems in mining safety and explored a new effective way for the treatment of mined-out area, making the work into an orderly, normalized and scientific stage.It is of important reference significance to the safe and rational development of domestic mine resources of the same type.
    Impact of After-Shock on the Stability of Tailing Dam Built by Upstream Method
    CAO Jin-Hai, DUAN Wei-Ping, WU Xiao-Gang
    2009, 39(07):  27-28+72. 
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    The upstream construction method of tailing dams uses the tailings in the reservoir to construct the later-period sub-dam.As the tailings in the reservoir is in under-consolidated state and has low density and loose structure during the mine production period, it is very sensitive to seism and very easy to liquefy due to seismic effect, leading to the instability of dam body.In combination with a research project of a tailing dam adopting upstream construction method, the impact of after-shock on the stability of tailing dam is analyzed, with the results being reference to the seismic design of similar tailing dam projects.
    Practice of Mining for Inclined Curtain in Large Waterflow Mines
    ZHANG Yong
    2009, 39(07):  29-32. 
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    To realize a safe mining in the specific conditions of large waterflow mine, Gujiatai Iron Mine has successfully solved the underground water problem by adopting a limestone curtain grouting of near-orebody roof, which uses sublevel fill stoping with pre-control roof and medium-long hole under the protection of inclined curtain for room stoping.The stope structure parameters and extraction process of this mining method are presented.The production practice has verified that it can well adapt the mining under water.
    Forecast of the Unit Explosive Consumption for Blasting in Open-Pit Iron Mine
    LI Zhan-Jun, WEN Jian-Qiang, ZHENG Bing-Xu
    2009, 39(07):  33-35+38. 
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    With the forecast practice of the unit explosive consumption for blasting in an open-pit iron mine, the forecast method and calculation method by Kuznetsov and Rosin-Rammler mathematical model at a given boulder yield are presented.Evaluation and suggestions are made on the optimization of blasting parameters of open-pit blasting by the said model based on the practical experience.
    A New Approach of Large-Diameter Long-Hole Side Caving
    YANG Xiao-Lei, LIU Rang
    2009, 39(07):  36-38. 
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    Considering the deposit occurrence and wallrock properties, a new approach of large-diameter long-hole side caving is proposed, in which undercut is not made independently but formed by the extension of large diameter holes, which enables the stope room caving and the formation of flat bottom structure.The stope elements and process of this approach are discussed and the unit explosive consumption and the explosive charging and wire connecting mode in the test are described.Some valuable results are gained from the test.
    Optimization of the Development System and Mining Method of Cangshan Iron Mine
    LIU Zhi-Sen
    2009, 39(07):  39-42. 
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    The final determination of the development system and mining method in mine construction is a process of gradual optimization.To ensure Cangshan Project can realize a safe, economic and efficient operation so as to gain the expected benefit, a series of adjustments and optimizations were made on the underground development system and mining method by means of market survey, investigation, consultation, data reference and argumentation during the project feasibility study and implementation period.As a result, the development system and mining method which are under implementation now were formed.In the series of adjustments and optimizations, the irrational factors involved were regulated into rational ones, laying a good foundation for the project future efficient operation.
    Recognition of the Stripping Technology for Open-Pit Mines under Market Economic Conditions
    WANG Zhong-Hai
    2009, 39(07):  43-44+176. 
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    The paper describes briefly the mine stripping process parameters and holds that, under the market economic conditions, the mine design and production entities must select the process parameters suitable to the market changes.
    Study on the Beneficiation of Oxide and Sulphide-Mixed Copper Ore from Yulong Mine in Tibet
    ZHOU Gui-Ying, WEN Jian-Kang, SONG Yong-Sheng, LI Yan
    2009, 39(07):  45-46+65. 
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    In light of the characteristics of oxide and sulphide-mixed copper ore from Yulong Mine of high pyrite content|oxidation rate, secondary copper minerals content, and content of gangue easy to slime and complex properties, beneficiation tests and bioleaching tests were made for the ore on various flowsheets.It is recommended, through the comparison of test results, to adopt a flowsheet consisting partial copper-sulfur bulk flotation and flotation for separating copper from sulfur, which can obtain a copper concentrate grading 19.54%at a copper recovery of 19.54%, which are good performances.
    Application Practice of the Configuration of Primary Grate-Type Ball Mill with Flat-Bottom Classifying Hydrocyclones
    QIN Tong-Wen, WANG Lian-Sheng, WANG De-Ming
    2009, 39(07):  47-49. 
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    The configuration of MQG-3660 primary ball mill with improved φ660 flat-bottom hydrocyclones makes the ball mill throughput to reach 240 t/h and its utilization coefficient to be 4.4 t/(m3·h).This kind of hydrocyclone is suitable for coarse particle classification and has high classification efficiency and an unblocked spigot, therefore being worthy of spreading.
    Research on the Wind Separation of Low-Grade Oolitic Limonite Ore
    HUO Jie, LI Ming-Feng, SHU Wei, WANG Cheng
    2009, 39(07):  50-52. 
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    The feasibility study was made on the beneficiation of Hainan Danzhou oolitic limonite ore grading 40.15% mainly by wind separation.An iron concentrate grading 56.55% at a recovery of 84.50% was finally obtained with the help of roasting -magnetic separation.The process can avoid the serious sliming of limonite ore processing to some extent, and save the water and energy.
    Study on the Separation of Lead from Zinc of a Lead-Zinc Polymetallic Ore
    LI Zheng-Yao, WANG Ling
    2009, 39(07):  53-56+102. 
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    Study was made on the separation of lead and zinc in a complex lead-zinc polymetallic ore.The chemical composition and lead-zinc phases of the ore were analyzed and the kinds of lead, zinc, gold and silver minerals and their size disseminating characters were indentified.A preferential flotation flowsheet was adopted, which used calcium oxide and zinc sulfate to depress zinc sulfide and SN-9 as the collector to obtain a qualified lead concentrate, and used copper sulfate to activate the zinc to obtain a qualified zinc concentrate, with the lead and zinc recoveries reaching 94.06% and 86.80% respectively, and the associated gold and silver being enriched in lead and zinc concentrates.
    Regulation and Practice of the Reagent Regime of Dapai Lead-Zinc Concentrator
    HONG Guo-Ping, YANG Min
    2009, 39(07):  57-58+157. 
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    In view of serious lead and sulfur inclusions, strong activity of zinc at pH=9 and difficult depression in the beneficiation of low-grade complex lead-zinc ore, a combination of sodium sulfite and zinc sulfate was used as depressor and a combination of SN-9# and butyl xanthate as collector, which effectively improved the recovery of both lead and zinc at a low pH value.
    Optimization of the Technological Process of a Concentrator
    ZHANG Cong-Xiang, BAI Xiao-Ming, WANG Chang-Yan
    2009, 39(07):  59-62+108. 
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    The change in the properties of run-of-mine ore had caused a great difference between the real technical indexes and process parameters of the processes and those designed, and further a change in the distribution of workloads and process parameters of various processes in a concentrator since its commissioning.A comprehensive investigation was made of the whole process to find the problems, and corresponding optimization measures were taken to realize an effective control of the production process, and to reduce the tailing grade at the same time of stabilizing the concentrate quality so as to improve the metal recovery.
    Practice of the Transformation for Improving the Iron Concentrate Grade in  Ruyang Molybdenum's Iron Separation Workshop
    GAO Wei-Hai
    2009, 39(07):  63-65. 
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    To improve the iron concentrate grade, Jinduicheng Molybdenum Group Ruyang Ltd carried out a technical transformation of the process, including increasing the size of grinding mills, the number of grinding stages and the number of cleaning by magnetic separation.As a result, the iron concentrate grade has been improved from 43.00% to 63.00%, achieving remarkable economic benefits.
    ANN-Based Metallogenic Prognosis Model
    MAO Zheng-Li, YAN Ji-Tao, LAI Jian-Qing
    2009, 39(07):  66-68. 
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    Conventional Metallogenic prognosis is only capable of a qualitative research of deposit formation and controlling geological factors but fails to give quantitative values of their contribution degrees to the metallogenesis.BP ANN's highly nonlinear reflection function can well fit the highly nonlinear coupling relation involved in the metallogenesis process.Therefore, the Ann-based metallogenic prognosis model has higher prognosis accuracy than conventional models
    Test Study on the Permeability of Grouting Wall System
    ZHANG Sheng-Jun, SUN Hui, WANG Zai-Quan
    2009, 39(07):  69-72. 
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    To study the stability of grouting waterproof wall system, a test was made on the permeability of grouting wall by the MTS815.02 electro-hydraulic servo controlled rock mechanics testing system, and the permeability characteristics of grouting wall system in the whole process of compression fracture were identified.The result shows that the permeability coefficient will increase gradually with the pressure increase and drastically after the strain gets to a critical value, when the fissure will occur.Moreover, the fissures and grouting concretion have an evident effect on the permeability coefficient.
    Application of Sequential Scanning Algorithm in Kriging Prediction
    SUN Ka, WENG Zheng-Ping, LI Zhang-Lin, WU Chong-Long
    2009, 39(07):  73-76. 
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    The geographical coordinates of sample data and block data are transformed into the coordinates formed by the searching ellipsoid's strike direction, inclination and vertical direction.Then, the sample data and the block data in the new coordinate system are sequenced along axle direction.Finally, with the least rectangular bounding box of the search ellipsoid as the boundary, the sample data influencing the current block grade are determined by binary search algorithm, thus speeding up the grade prediction process.
    Forecast of the Maximum Water Inflow in Mine Pits by  Rise-Fall Ratio Method Under a Steady Environment
    XUAN Shen-Min, ZHANG Jin-Zhen
    2009, 39(07):  77-78. 
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    There are three conventional ways to forecast the maximum water inflow in mine pits: diagram method, least-squares analysis，and linear regression analysis.These methods are all based on experiment data, which involve a quantitative forecast based on the mathematical statistical principle, many conditions and a bothersome process.The method proposed in this paper, based on the principle of conservation of energy and the equivalent undamped passage, summarizes the movement law of underground water inrush in mine pits and sets up an equation for the water inflow between rise and fall, which requires only simple conditions and is easy to solve with an accurate result.
    Interparticle Comminution, More Crushing ＆ Less Grinding and Inertia Cone Crusher
    XIA Xiao-鸥, SUN Xi-Bo, TANG Wei, LUO Xiu-Jian
    2009, 39(07):  79-83+89. 
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    The paper summarizes the current comminution theories, studies the interparticle crushing mechanism, analyzes the relation of crushing-grinding cost with the mill feed size, and further demonstrates the great practical significance of “more crushing & less grinding” process.It also describes briefly the structural features and working principles of inertia cone crusher, and illustrates that inertia cone crusher is a new type of energy-saving superfine crushing equipment, which, based on the interparticle comminution theory, is capable to satisfy the process requirement on more crushing and less grinding and
    Comparison and Application of Nordbeg and Sandvik Cone Crushers
    SU Xing-Guo, WANG Chang-Yan
    2009, 39(07):  84-85. 
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    The paper describes the application of crushing equipment in the beneficiation process for lean hematite ores in Anshan region, and based on the comparison of the structure and technical performances of Nordberg and Sandvik cone crushers for fine and mediate crushing, proposes that a combined application of Nordberg and Sandvik cone crushers for the lean hematite ores in Anshan region can have a better crushing result.
    Application of the High Gradient Magnetic Separator with Horizontal Magnet System in Meishan Iron Concentrator
    YANG Long, ZHANG Jun, TANG Yu-He
    2009, 39(07):  86-89. 
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    Pulsating high gradient magnetic separation is one of the effective ways to separate weakly magnetic minerals.Presently, there are pulsating high gradient magnetic separators with a vertical or horizontal magnet system.The kind with a horizontal magnet system adopting multi-gradient and air-gas joint discharge techniques was tested in Shanghai Meishan Iron Concentrator.The test results showed that, at the same operation conditions, its performance indexes reached those with a vertical magnet system operating on the production site, which were kept in a long-term operation.It ran for three months on the site of Meishan Concentrator without replacing the medium box, which indicates that this equipment is rationally designed and its ore discharging mode is both advanced and efficient.
    Remote Bus Graph and Image Monitoring System for the Monorail Transport at Metal Mines
    WANG Ting-You
    2009, 39(07):  90-92+146. 
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    A developed remote bus graph and image monitoring system for the monorail transport at metal mines will be installed and put into operation soon.The paper presents the hardware configuration, monitoring interface, functions, main technical characteristics and software of this transport monitoring system, which can improve the ore transport efficiency and ensure the transport safety in successful operation.
    Research and Realization of Mine Visualization Technology
    WU Zhong-Xiong, WANG Yong-Tao
    2009, 39(07):  93-96. 
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    In accodance with the basic principle and method of mine visualization technology, a kind of new software of 3D mine visualization system was developed by comprehensively using computer linguistics, database technology, computer graphics and geological statistics.By adopting this software and based on the mine conditions and design data, a visualization system for Daxin Manganese Mine, CITIC DAMENG Mining Industries Limited was established.
    Application of the PLC Automatic Loading and Unloading Line in Loading and Transportation of Gangue
    YU Miao
    2009, 39(07):  97-99. 
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    To improve gangue emission efficiency of gangues and coal gangues to discharge gangues smoothly and orderly, the PLC atuomatic loading and unloading control process and method are introduced besed on the PLC design process,and an approach for the automatic handing and transportation is prepared.Then, the trapezoidal pattern and command procedures of the control system are programmed, so as to send the command procedure to the debug system by PLC programmer for installation and utilization.By the PLC automatic loading and unloading control lines, the situations that the relay what is mostly used to send and receive control signals at current are not reliable; the system often shows errneous signals and wrong operation, can be greatly improved, and the production efficiency and safety can be significanlty increased.Meanwhile, the service life of the motor vehicle is extended, and the labor intensity of workers reduced, owing a certain social benefils.
    Situation and Prospect of Digital Mining Development in Meishan Iron Mine
    XU Zhi-Qiang, ZHANG Ming-Feng
    2009, 39(07):  100-102. 
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    The paper reviews the digital mining construction efforts made by Meishan Iron Mine in recent years from the aspects of basic management of geological, exploration and mining, mining production process management and safety production management.Based on this, the development orientation of digital mining construction of Meishan Iron Mine is prospected in view of the situation of domestic underground digital mining development.
    Fuzzy-Intelligent Control Arithmetic for the Ore Pulp Level in Mineral Separation Process
    LIANG Lei, LI Zhen-Guo
    2009, 39(07):  103-105+135. 
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    A fuzzy intelligent controller was designed for the ore pulp level in the pump sump in the classification stage of mineral separation.It uses the fuzzy control arithmetic and frequency speed control technology to realize the control of the pulp level in the sump so as to solve the problem that the variation of pump throughput due to an intense variation of pulp level can lead to a reduced classification efficiency of hydrocyclones.The simulation result shows that the system's steady state error is smaller than 0.17%, thus improving the classification capacity of hydrocyclones.
    Principle and Making of Digital Pulse Demagnetizer
    Liu-Wei-Sheng, ZHU Yu-Hua
    2009, 39(07):  106-108. 
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    Based on a theoretical analysis of RLC oscillating circuit, the paper elaborates the demagnetization principle of ferromagnetic materials, discusses the working process and the function of components of digital pulse demagnetizer.Its innovation point lies in that it realizes a flexible regulation of charge and discharge intensities via key input, LCD display and monolithic integrated circuit control, making it suitable for the demagnetization of iron powder, lump and particles with various quantities of magnetism.
    Portable XRF Analyzer Used for Determining the Content of Main Element Fe
    ZHANG Zhen, LAI Wan-Chang, YU Xin-Hua, CHEN Xiao-Qiang, WANG Guang-Xi, ZHANG Lin
    2009, 39(07):  109-110+150. 
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    The application of XRF portable analyzer in rapid analysis of the main element of ferroalloy has extended the application of this type of instrument to outside the mineral investigation field.The analysis method of ferrochromium and ferronickel samples is discussed and the mathematical model for using binary ratio technique to analyze dual samples is set up.The result shows that it is feasible to use the dual ratio technique to analyze the contents of alloy elements and of the main element Fe in ferrochromium and Ferronickel samples.
    Purification of Ultrafine Powder by Pulse Cartridge Dust Collector
    ZHANG Yi-Zhi, CHEN Hai-Yan, LIN Li-Jun, QIN Jin-Zhu, YANG Jun-Rui
    2009, 39(07):  111-114. 
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    Test was made on using a pulse cartridge dust collector to purify 0.5～5 μm ultrafine powder.The main performance parameters of the collector such as its purification efficiency, resistance and filtering wind speed.The test result shows that for 0.5～5 μm ultrafine powder, the dust resistance is less than 300 Pa at a filtering wind speed of 0.8～1.25 m/min,and is less than 1 200 Pa at a filtering speed of 2.8 m/min, and the purification efficiency is 99.999 7%.The pulse cartridge dust collector has advantages of high dusting efficiency, low resistance loss and economized power consumption, benefiting its application in the purification of ultrafine powder.
    Geo-Slope-based Analysis for the Dump Stability of Dry Red Mud from Bayer Process
    欧Xiao-Duo , FAN Ke-Shi, RAO Ping-Ping
    2009, 39(07):  115-118+163. 
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    In light of the features of red mud from Bayer process, the characteristics of Pingguolu red mud dump and the physical and mechanical properties of the red mud in the dump are analyzed.The causes for the cracks in the surface of the dump stacked by red mud dry discharge are elaborated and the stability of red mud dump slope with crack existence is calculated by using the SLOP/W module in Geo-Slope software.The result indicates that the existence of cracks can reduce the static safety coefficient of the red mud dam by about 0.5% and the red mud dump which has been stacked to the secondary sub-dam is stable at normal operation conditions.
    Experimental Research on the Dust and Smoke Suppressor for Coalmine Blasting
    CHEN Xue-Xi, MA Shang-Quan, BAI Song, OU Sheng-Nan
    2009, 39(07):  119-121+126. 
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    In view of the deficiencies of current dust and smoke suppressors for coalmine blasting, such as low efficiency, difficult acquisition of raw material and high price, a kind of high-performance formulation of dust and smoke suppressor is developed by using uniform design method to decide the mixing proportion, which is composed of hygroscopic agent, surfactant, smoke suppressor and corrosion inhibitor.Taking these 4 elements as variables, a regression equation for dust and smoke suppression coefficients is obtained by stepwise regression method based on 3.0 version software for uniform designing.On this basis, the optimal value of dust and smoke suppression coefficients is found under given experimental conditions.The optimized formulation of aqueous solution is: hygroscopic agent, 5%; surfactant, 1%, erosion inhibitor 0.4%;and smoke suppressor 0.2%.Application tests indicate that this kind of agent can effectively and conveniently suppress the poisonous dust and smoke produced in coalmine blasting, and will have an extensive application prospect in safety and environment field.
    Study on the Risk Assessment Model for Dusting Operation Sites
    TIAN Dong-Mei, YAO Jian, JIANG Zhong-An, NIU Wei, ZHENG Bin
    2009, 39(07):  122-126. 
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    Pneumoconiosis incidence rate has been kept high in China, causing a wide social attention to the safety issue of dusting operation sites.The conventional safety assessment has not been adaptable to the new requirements of development and a scientific, rational assessment is required for dusting operation sites, which will be of great significance to reducing the dust-caused occupational hazards.Starting from the factors of man, material, environment and management, the paper discusses the influencing factors for the hazard degrees of dusting operation sites, including 12 second-level influencing factors and further 40 third-level influencing factors; sets up an assessment indicator system for dusting operation sites; proposes a risk assessment model for dusting operation sites based on a fuzzy comprehensive assessment with fuzzy mathematic theory; and examines the rationality of this model through actual application.
    Study on the Heat Exchange between the Wallrock and Airflow in Inclined Laneway
    CHEN Xi-Shan, MIAO Cui-Fang, GU Hui-Ying
    2009, 39(07):  127-130+154. 
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    With the increase of mining depth and further the continuous increase of geotemperature, the heat exchange between laneway wallrock and airflow takes an increasing proportion.The study of this heat exchange law in normal circumstances is of great significance to the underground heat source analysis and airflow temperature forecast.Based on the theory of cooled zone, a mathematical model for the heat exchange between the inclined laneway wallrock and airflow, without considering the wetness exchange and other underground heat sources, was derived and its analytical solution obtained, which has been verified by the data practically measured in Jinqingding Mine area of Jinzhou Mining Group.
    Processing of Acid Mine Drainage and Development Prospect of Source Control Technology
    ZHAO Ling, WANG Rong-Xin, LI Guan, CHEN Ming
    2009, 39(07):  131-135. 
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    The Paper analyzes the source, characteristic, mechanism and foreign and domestic technologies of acid mine drainage, discusses the source control technology in view of its characteristics, and finally proposes the technology of utilizing the coal ash to cover the waste dump and tailing reservoir to control the acid mine drainage source in non-ferrous metal mines so as to attain the goal of treating the wastes with wastes,reducing the pollutant discharge and cutting the treatment cost.
    Study on the Synergetic Catalysis with Ozone-Oxidation for  Treating Droplet Xanthate Wastewater
    DUAN Hai-Xia, LIU Jiong-Tian, LANG Xian-Ming, WANG Jing-Cheng
    2009, 39(07):  136-138. 
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    Xanthate in the process wastewater of iron ore flotation was selected as target substance.Study was made on treating the atomized Xanthate by a combination of activated carbon, ultraviolet light and ozone oxidation.The experiment investigated the influence of the pH value, ozone dosage, activated charcoal, atomization, free radical scavenger on the xanthate removal rate, and the two methods (atomization/O3/UV/GAC and aeration/O3/UV/GAC) were compared.The results show that, under the conditions of wastewater atomization, no pH adjustment, a reaction time of 35 minutes, and an ozone dosage of 300 mg/L, the xanthate removal rate was 96.3%, 15% higher than that by the process of aeration/O3/UV/GAC.This process can be used as a deep treatment means for xanthate-containing wastewater.
    Discussion on the Causes for Tailings Dam Accidents at Home and Abroad
    WEI Yong, XU Kai-Li, ZHENG Xin
    2009, 39(07):  139-142. 
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    Tailings facilities are a major component in mine production and also a potential risk source.With the continuous development of the mining engineering, the accidents of tailings dams have occurred frequently.Tailings dam failure will not only lead to tailings flow-out, but may also destroy the ecological environment of the downstream area in serious cases, resulting in enormous loss of human lives and property.Accidents of tailings dams causing heavy losses at home and abroad are listed.The causes are analyzed and the lessons that should be learnt and the preventive measures in production are put forward, with a hope to attract the attention to the safety of tailings dams.
    Study on the Applicability of Caustics to Rock Type Media
    LIU Cai-Ping, DUAN Qing-Quan
    2009, 39(07):  143-146. 
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    Rock has heterogeneity and discontinuity and rock's dynamic fracture property has been one of the hotspots and challenges in domestic and foreign studies.The paper studies the applicability of caustics to rock type media, hoping to have a general view of the caustics speckles surrounding the crack tip.The results show that no caustic speckles is found in three types of rock materials.The causes for being hard to shoot or even finding no caustics speckles in rock type materials are pointed out from viewpoints of experiment and theoretical estimation.
    Optimization of the Layout of Monitoring Points for Multi-Ventilator  and Multi-Fan Station Ventilation System
    XIE Xian-Ping, DUAN Zai-Peng
    2009, 39(07):  147-150. 
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    For an optimal management and automatic supervisory control of the mine multi-fan and multi-station ventilation system, a certain number of monitoring points should be allocated in proper sites of the system so as to provide necessary information reflecting and estimating the system operation status, which is an important part of computer's on-line optimal management.The layout of monitoring points of ventilation system is related to the number and location of monitoring points as well as the network decomposition method.A simultaneous consideration of the relation between their layout and the said three factors will complicate the issue and therefore, it is considered as a two-level question.First, the point location and network decomposition method are not considered at this time and the point number is determined by Fibonacci method; and then, at the given point number, the optimal point location is determined and further the optimum outcome of network decomposition and the largest modular difference can be got.Its practical application shows that it can make the question easy to solve with not a high computing work load.
    Comprehensive Treatment & Utilization Project of the Pit Waste Water in TongLushan Mine
    WEI Yang, LI Xiang-Jun, DING Hui, FU Hui-Fang
    2009, 39(07):  151-154. 
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    The paper elaborates, from the viewpoint of environment protection, the harms of the mining pit waste water discharge and the importance and necessity of waste water treatment at Tonglushan Mine.An optimal water treatment approach is selected through comparison and analysis.This approach takes full consideration into the relation of the long-term and the short-term, and the partial and the integrated, makes well use of the current facilities to save the construction investment, and adopts the developed skills and scientific researches to ensure the quality of water treatment and lower the operation costs.The implementation of the optimal treatment and utilization project has achieved remarkable effects; the utilization rate of waste water improved, the environmental pollution reduced, and the production costs lowered.The project realizes comprehensive environment, society and economic benefits, then taking an essential step in building the Zero-discharging mine.
    Study on the Beneficiation Process for Recovering Rare-earth from the LIMS Tailing of HIMS Rougher Concentrate after Magnetizing Roasting in Baogang Concentrator
    CAI Zhen-Lei, CAO Ming-Li, CHE Li-Ping, YU Yong-Fu, HU Hong-Yan
    2009, 39(07):  155-157. 
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    Study was made on the beneficiation process for recovering rare-earth from the low intensity magnetic separation (LIMS) tailing of high intensity magnetic separation (HIMS) rougher concentrate after magnetizing roasting in Baogang concentrator.Tests were made on the single flowsheet and a whole-flowsheet consisting of one rougher, three cleanings and one scavenging for treating the concentrate obtained from the bulk flotation of LIMS tailing after carbon removal.The test results show that a rare-earth concentrate product having a REO grade of 64.41% and a recovery of 18.13% can be obtained.Suggestions are made on the improvement and optimization of the test flowsheet.
    Comprehensive Utilization of Iron Tailings in China
    ZHAO Rui-Min
    2009, 39(07):  158-163. 
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    The paper analyzes briefly the comprehensive utilization status of iron tailings in China, describes the processes and equipment for recovering valuable metals from the tailings in several mines, discusses the tailing utilization and reclaimation and exploitation of tailing reservoirs and makes some relative suggestions.
    Research on the Comprehensive Utilization of Dabaoshan Polymetallic Sulfide Tailings
    HUANG Lan-Chun, ZHOU Yong-Zhang, FU Shan-Ming, YANG Zhi-Jun, ZHANG Cheng-Bo, CAI Li-Mei
    2009, 39(07):  164-168. 
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    Dabaoshan Mine is a large polymetallic sulfide deposit in the South China.The analysis shows its tailings contain abundant metal sulfides such as pyrites, pyrrhotite, sphalerite, chalcopyrite and galena, and also quartz and clay minerals, of which the content of metal element Zn is of the recovery value.In light of the tailings composition characteristics of and the available recovery technology for tailings, a new method for recovering Dabaoshan metal sulfide tailings is proposed as a result of the research, in which, the tailings are screened and gravity-separated into light and heavy fractions.The heavy minerals are treated by flotation to recover the metal element Zn, by oxidation and roasting to recover sulfur, by chlorination-roasting to recover other metal elements and by magnetization to recover iron minerals.The light fraction of gravity separation can be directly utilized or screened prior to utilization.This process can make use of tailings as resource without polluting the environment, realizing the aim of non-tailing mine.
    Tests on the Classified Dewatering of Meishan Iron Tailings
    YU Fa, CAO Pei-Ping, AN Tai-Ping
    2009, 39(07):  169-172. 
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    The too high moisture and difficult dewatering of Meishan iron tailings made it difficult to comprehensively utilize.To solve the challenge, industrial tests were made on the classified dewatering of the tailings in the concentrator in 2006.The equipment used in the test included FX-200 cyclones, a TT-24 m2 ceramic filter and a XMZ-340/1250 box filter press.At a filtering pressure of 0.08～0.09 MPa, coarse fraction tailings product was obtained with a moisture of 14.84%, filter coefficient of 0.458 t/(m2·h) and yield of 42.68%.The test result showed that the dewatering of the classified fine fraction tailings by the existing filter press resulted in increased product moisture and filtering time.The classified dewatering has also brought a reduction of production cost by 0.58 yuan per ton tailings.
    Research on the Application of Sags in Mineral Polymer
    NIE Yi-Miao, NIU Fu-Sheng, ZHANG Jin-Rui
    2009, 39(07):  173-176. 
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    The slags refer to a blast furnace byproduct in iron-making.The paper describes the properties of slags, analyzes the feasibility of using the slags to make mineral polymer, discusses the application of slags in mineral polymer and forecasts its application in making mineral polymer.