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Table of Content

    17 August 2009, Volume 39 Issue 08
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    Analysis on the Main Restricted Factors of Influencing the Sustainable Development of Gushan Mine
    WANG Wen-Xiao, ZHENG Ming-Gui, CAI Si-Jing
    2009, 39(08):  1-4+34. 
    Asbtract ( 1831 )  
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    Gushan mine is a mine enterprise which mainly produces the iron ores.It owns a good basic condition but also has many restricted factors of influencing its sustainable development.Analysis showed that such factors as the hydrological geology, investment and costs, technology and human resources are the main restricted factors.Hence, some methods of strengthening the comprehensive utilization of mineral resources, promoting the technical innovation, reinforcing the administration and reformation, promoting the sustainable development are pointed out to fully implement the scientific concept of development.
    Modeling and Stability Analysis of the Mined-Out Area in Underground Mine by CMS
    WANG Yun-Min, LIU Hai-Lin, SUN Guo-Quan
    2009, 39(08):  5-9. 
    Asbtract ( 1886 )  
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    The numerical analysis models in the conventional stability analysis of mined-out area have over-simplified the shape of mined-out area, leading to too simple models and a poor reliability of the stability analysis results.CMS (Cavity Monitoring System) was used to make a 3D scanning of the mined-out area in underground mine and accurately get the distance from the laser head to the boundary of mined-out area.The positioning point coordinates of total station survey were entered into the CMSPosProcess software and the generated data into 3Dmine software to build the real occurrence model of mined-out area.A study was made to use VC++ to program an application for a direct input of the block centroid coordinates output from the 3Dmine into FLAC3D so as to establish a mechanical model of mined-out area, forming a new method from a practically measurement model to a mechanical calculation model, greatly improving the accuracy and reliability of the stability analysis of mined-out area.Good results were achieved in the static calculation and the stability analysis of the mined-out area in the south branch mining area at -60 m level in Shirengou Iron Mine.
    Study on the Iron Mine Resource Support Capacity by Principal Component Analysis
    JIA Wen-Long, FAN Ji-Tao
    2009, 39(08):  10-14+34. 
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    The resource support capacity of mines depends on many factors such as production capacity, ore grade and available reserve.The larger the mine production capacity is and the more the ore mined is, the stronger its support capacity to the current resource supply will be; the more the available reserve is and the longer the residual mine service life is, the more favorable its long term resource support capacity will be; and the higher the grade of its mineral resource is and the better its ore quality is, the higher its support capacity will be.A comprehensive analysis of China's open-pit mines is made by principal component method to identify the major mines having an important role in supporting China's iron ore supply.Their position in China's iron ore resource supply and their development trend are also analyzed.Finally, suggestions on the policy for improving China's iron ore resource support capacity are made.
    Criteria for the Plastic Energy Catastrophe of Rockmass Engineering Instability and Their Application
    HAN Xian-Min, LI Xiao
    2009, 39(08):  15-18. 
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    The decision of the form of rockmass engineering instability has been an important issue in the rock engineering field.Based on the summary of the previous studies, the energy dissipation principle and the catastrophe theory, the criteria for the plastic energy catastrophe of rockmass engineering instability were proposed and applied in judging the stability of the horizontal ore stratum in Jinchuan No.2 Mine.Based on  the site engineering geological survey and acoustic detection of the horizontal ore stratum, it is concluded that the ore stratum was newly destroyed and is in the post-peak region, and no abrupt collapse will occur in its mining process.  
    Research and Application of the New Treatment Technology for Abandoned Stope
    ZHANG Jun-Sheng, LI Jun-Ping, SONG Shi-Sheng
    2009, 39(08):  19-22. 
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    With the underground abandoned stop and ground pressure control in Dongtongyu gold mine, Shaanxi as the study case, the grooving top-caving method and the roof cutting and pillar caving method were proposed.The parameter design method for the treatment of abandoned stope was studied.As a result, a complete theoretical, practical and evaluation system for the treatment of gently inclined abandoned stope is formed, including the theoretical design, site construction and effect observation.
    Study on the Calculation Methods for Dam-Break Water Flow
    WEI Yong, XU Kai-Li, ZHENG Xin
    2009, 39(08):  23-25. 
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    Calculation of dam-break water flow is of great significance to the dam-break simulation, break evolution prediction, flood hydrograph prediction, damage assessment, disaster control and people's life and property protection.The calculation methods for common dam-break water flow are studied, such as the average width of dam-break, the maximum flow at tailing dam and the flow graph at tailing dam.Finally, the method is used to forecast the tailing flow in case of a dam break of a tailing reservoir.
    Study of Arching Support by Long Distance Concrete Pumping
    ZHANG Hou-Quan, HAN Li-Jun, HE Yong-Nian, XIA Ji-Zong, JIA Wen-Liang
    2009, 39(08):  26-28. 
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    The water sump of a certain coal mine at -400 m level is located in a complicated geological structure zone with an extremely water-swellable floor.Under the functions of high tectonic stress, in-situ stress and expansion stress, the previous common support by bolt, mesh, shotcrete and cable can no longer keep the essential stability of wall rock of the sump.Based on the analysis of in-situ geological conditions and wall rock failure reasons, and in view of the deficiencies of the original support design, a full-face reinforced concrete arching method was adopted for the support of the sump's wall rock.The long distance concrete pumping technology was introduced for the first time in mine arching support, which covered the shortage of common manual arching and obtained good technical effects and economic benefits.The research results show that it is very hard to keep the stability of sump in a soft rock stratum with great expansivity only by the support with bolt, mesh, shotcrete and cable.A secondary grouting can effectively improve the wall rock's carrying capacity and the integrity of support structure while a full-face reinforced concrete arching can control the serious floor heave of roadway.
    Dynamic Programming Optimization Model for Cutoff Grade and Its Algorithm
    CHU Dao-Zhong, WANG Qing
    2009, 39(08):  29-31+65. 
    Asbtract ( 1963 )  
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    Based on the analysis of the problems in available cutoff grade optimization methods, the paper proposes a dynamic programming optimization model for cutoff grade and describes its application in solving practical problems and its algorithm.The model considers the mining order and the grade distribution in different deposit sections and has realized the time-space dynamic combination of the cutoff grade in underground mining.Based on the mathematical model established, a corresponding computer application system has been developed and applied in a copper mine in Africa.
    Application of Paste and Mullock Unite Filling with Soft Partition
    YAN Ji-Song, ZHOU Xu
    2009, 39(08):  32-34. 
    Asbtract ( 1997 )  
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    Along with mining extend to depth of 1 000 m under ground, orebody occurrence and mining condition complicated gradually,Huize mining and processing plant reformed upward horizontal layer cut and filling route mining.This mine field adopted paste and mullock unite filling with soft partition, and carried through research on layer continuous mining, realized the aim of improving mining throughput and increasing, increasing mining relaim ratio, reducing dilution ratio, and mining without waste, on the condition of safety in production.
    Research on Mineral Processing for a Certain Fine-disseminated Hematite in Yunnan
    LIU Shui-Hong
    2009, 39(08):  35-38. 
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    A hematite mine of Yunnan has a fine dissemination size, where a process consisting of magnetic separation-gravity separation is adopted in production.But the obtained iron concentrate with only Fe grade of 57% can not meet the requirement of pellet production with Fe grade over 62%.In view of this, a concentration test is carried out to improve Fe grade.A combined flow-sheet of stage grinding-stage high intensity magnetic separation-inverse flotation is adopted.When final grinding of 86% -0.038 mm, an iron concentrate with Fe grade of 62.20% and Fe recovery of 56.36% can be obtained. 
    Experimental Research on Iron Sands Concentration in an Indonesia Beach
    CHEN Ping, 吕Xian-Jun , QIU Jun, DU Fei-Fei
    2009, 39(08):  39-41+56. 
    Asbtract ( 1928 )  
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    In order to provide a foundation to explore the iron sands of an Indonesia beach for domestic enterprises, researches on the ore prosperity and the related beneficiability experiment are carried out.The results showed that the main metallic minerals are titanomagnetite, ilmenite and hematite in iron sands.Then the technical process consisting of wet pre-concentration-grinding-magnetic separation is adopted.When the grinding size was above 76.63 % -325 mesh, a good performance can be achieved with Fe concentrate yield of 59.50 %, Fe grade of 60.28% and iron recovery of 76.13 %.
    Mechanism of Amine Collector in Reverse Flotation De-silicates Process of Iron Concentrates
    XIE Guo-Xian, LUO Lian-Ming, ZHANG Shu-Hong
    2009, 39(08):  42-44. 
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    This paper analyzed the relationship of the surface electricity of iron concentrate and silicate minerals with pH values of ore pulp, and the hydrolysis behavior of amine collector in ore pulps.On this basis, experiment is made to research the mechanism of amine collector in reverse flotation de-silicates process of iron concentrates.The results showed that the amine-collector in RNH2 does not act with the silicate minerals and could not reduce silicon under strong alkaline; Under strong acid condition, high content of amine-cation (RNH+3) in ore pulps acting with each other reduce or even lose the adsorption on mineral particles, and can not reach the good separation effect either.Hence, in reverse flotation de-silicates process of iron concentrates, an appropriate amine-action concentration should be kept by adjusting the  pH values according to the ore property.
    Research on Alkali-free Flotation Process of Soluble Salt-rich  High Sulfur Lead-zinc Ores
    FENG Zhong-Wei
    2009, 39(08):  45-48+56. 
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    There are high content of soluble salts as zinc sulfate and ferrous sulfate in some high sulfur lead-zinc deposits in a Yunnan Lead-zinc Mine, so that a large number of Zn2+, Fe2+ metal ions exist in flotation pulps.When pyrite is suppressed with lime in conventional flotation process, a large amount of hydroxide precipitation is produced with reaction of these metal ions with lime, which has a strong inhibitory effect on lead-zinc ores, resulting in an ineffective separation of lead-zinc complex ores.In order to reduce the impact of soluble salts on flotation of lead-zinc ores, the alkali-free flotation is adopted under the natural pH (acid) condition.For lead separation, zinc sulfate and sodium sulfate are taken as inhibitors, and aniline and drugs and ammonium drugs as collector; For zinc, the sodium silicate, sodium, carboxymethyl cellulose are taken as a modifier, PN405 as collector of zinc.Lastly, 59.57% lead concentrate with recovery of 75.14 % and 53.93% zinc concentrate with recovery of 93.70% have been obtained.
    Experimental Research on Beneficiation of a Low Grade Oxidized Lead-Zinc Ore in Yunnan Province
    HUANG Fu-Ming-Zhu, WANG Hong-Ju, LIU Quan-Jun
    2009, 39(08):  49-52+79. 
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    A large scale low grade oxidized lead-zinc mine containing 2.37% Pb and 4.60% Zn with a high ratio of oxidized lead-zinc ores reaching more than 90% has not been exploited.In order to utilize this kind of resources, an experimental study on beneficiation is carried out in which the process flow-sheets of sulfurization-lead floating with xanthate and desliming-sulfurization-zinc floating with amine collector KZF are adopted.A good technical index with 39.92% of lead concentrate containing 5.18% Zn at a Pb recovery of 61.31% and 37.03% of zinc concentrate containing 1.23% Zn and at a Pb recovery of 67.29% is achieved.
    Experimental Study on Copper-lead Separation with the Combinatorial Depressant
    MI Li-Ping, SUN Chun-Bao, LI Qing, XU Tao, LIU Xin-Wei
    2009, 39(08):  53-56. 
    Asbtract ( 1743 )  
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    Taking Na2SiO3，Na2SO3 and CMC as the combinatorial depressant, an experimental research on copper-lead separation from flotation concentrates for a copper-lead-zinc multi-metal sulfide mine was made.Such factors for the copper-lead separation as the consumption of the combinatorial depressant, pump density and time were studied to seek for an optimum condition.Based on this, the copper concentrate grading 27.19% and bearing 5.13% of lead at a 97.26% copper recovery and the lead concentrate grading 72.98% and bearing 1.46% of copper at an 88.08% recovery were obtained by a closed-circuit process of one-rough concentration, two-scavenger and two-cleaning separation. 
    Investigation on Roasting-Leaching Technology for an Arsenic-bearing Gold Concentrates in Qinghai Province
    LI Yan, ZHOU Gui-Ying, SONG Yong-Sheng
    2009, 39(08):  57-59. 
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    The arsenic-bearing gold mine in Qinghai province is a refractory one, where the gold cyanidation-leaching rate only reaches 41% in flotation process.Therefore, a roasting-cyanidation leaching experiment for gold concentrates is made.And the effect of roasting stage and temperature on roasting, and the effect of grinding size, the densities of sodium cyanide, the variety and consumption of protective alkali, liquid-to-solid ratio and leaching time on gold leaching are investigated.Then an optimum condition is determined to make gold leaching over 90.54 % for flotation gold concentrates.
    Research on the Beneficiation Process of a Henan Andalusite Ore
    ZHANG Cheng-Qiang, LI Hong-Chao, ZHANG Ying-Xin, ZHANG Hong-Xin, TIAN Min
    2009, 39(08):  60-61+65. 
    Asbtract ( 1830 )  
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    Based on investigation of mineralogy characteristics of a certain Andalusite ore in Henan province, a beneficiation process consisting of dry HIMS for tailing discarding-gravity medium separation- dry HIMS for classification- shaking table and wet HIMS to strengthen the recovery is determined by mounts of tests.Then a good performance with concentrate yield of 5.46%, purity of 97.11%, and Andalusite recovery of 65.95% is obtained, providing a feasible technical scheme for exploration of mine.
    Study on Synthesis of Surfactants for Refractory Oxidation Iron Ores
    MEI Jian-Ting, BAI Xue-Lian, LUO Yi-Ding, DONG Ji, HE Rong-An
    2009, 39(08):  62-65. 
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    In accordance with classification of the anionic surfactants, cationic surfactants, amphoteric surfactants, researches on synthesis of flotation collector surfactants for refractory oxidation iron ores are introduced.
    Measurement of Hg content in Iron Ores by Atomic Fluorescence Spectrometry
    QIU Zhi-Jun, FU Ran-Ran, YING Hai-Song, KANG Ji-Tao
    2009, 39(08):  66-68. 
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    The Atomic Fluorescence Spectrometry is pointed out to measure the Hg content in iron ores.Based on this, the dissolution method, samples' acid, the allowance of disturbing elements and the optimum working conditions for devices were determined.The results show that this method with the detection limit of 0.032 μg/L, the accuracy of 4.5%, the linear area of 0 ~ 40 μg/L, the recovery rate of 97.2% ~104.8% can be adopted as daily inspection of Hg content in iron ores.
    Preliminary Discussion on Indium Enrichment Regularity of Dachang Polymetallic Tin Ore-fields in Guangxi
    LUO Wei, YIN Zhan, DAI Ta-Gen
    2009, 39(08):  69-71+86. 
    Asbtract ( 2004 )  
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    There are huge reserve of rare Indium in Dachang polymetallic Tin ore field in Guangxi province.Based on investigation on the variance character of Indium contents in different deposits and ore-bodies of this ore-field, the indium enrichment regularity is discussed.The results showed that indium enrichment has a closely relationship with Tin.And the content of tin is increased with depth and gradually decreased around Longxianggai rock.
    Characteristics and Classification of Iron Oxide Copper-Gold Deposits
    XIAO Xiao-Lin, ZHU Zhi-Min
    2009, 39(08):  72-75+105. 
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    The iron oxide-copper-gold (IOCG) deposit is an important deposit known since 1990's and is paid more attention by scientists and researchers in mining fields due to its large economic and scientific values.In light of new information and documents in recent year, the IOCG deposit is defined as a kind of hydrothermal Cu or Cu-Au deposits family with low sulfide and high iron oxide (magnetite±hematite with low Ti content).Its characteristics are as follows: valuable metals mainly as Cu, or Cu-Au with low sulfide; hydrothermal deposits with extensive Na-K alteration; strong structural controls; abundant magnetite and/or hematite with low Ti content; no clear relations with igneous rocks.Based on the genetic type of deposits, IOCG deposits can be classified into three types as magmatic IOCG deposits, non-magmatic IOCG deposits and hybrid IOCG deposits.
    In-situ Stress Measurement by CSIRO Hollow Inclusion Cell in Yuyuan Mine
    SUI Zhi-Li, QIAO Lan, SUN Xin-Shuo, LI Yuan, GAO Wen
    2009, 39(08):  76-79. 
    Asbtract ( 1914 )  
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    Hedong coal mine in Shanxi is among large ones in China and has a very complex geological structure.In-situ stress measurement for the mine depth was required for studying the stress variation.The in-situ stress measurement was made by stress relief method with improved CSIRO cells.New temperature correction technology was used in studying the effect of temperature on the measurement accuracy, the effect of resin elastic modulus and the strain gauge location were also considered, and the formula for correcting the confining pressure was deduced, improving the accuracy of in-situ stress measurement.The measurement results show that the maximum principal stress is nearly horizontal in NNW direction and of the magnitude of about 14 MPa.In the same plane, a kind of in-situ stress has some but not significant change in both magnitude and direction at different points, indicating a uniform in-situ stress field in the mining area.
    Geo-stress Measurement and Distribution Characteristics of Fengshan Copper Deposit
    BI Zhong-Wei, DING De-Xin, ZHANG Ming, JIN Feng
    2009, 39(08):  80-82+86. 
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    A three-dimensional stress testing was conduced at 6 points at -50 m and -100 m levels of Fengshan copper deposit by stress relief method, obtaining the 3D geo-stress data of the 6 measuring points.The results indicate that the geo-stress in the south is larger, with the biggest principal stress being about 15 MPa; and that in the north is smaller, with the biggest principal stress being about 8.0 MPa.The geo-stress in the mining area changes along with the topographic relief, and is obviously controlled by topography and geomorphology.The deadweight of the rock-mass and the tectonism are the main factors forming the geo-stress, and they have different effects on the different areas, with the south area mainly affected by tectonic stress, and the deep area mainly by deadweight.The results provide a reliable basis for the production and tunnel support design of Fengshan Copper Mine.
    Production Exploration of the Middle Ore Section in Makeng Iron Mine
    JIANG Yi-Feng
    2009, 39(08):  83-86. 
    Asbtract ( 1989 )  
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    Makeng Mining is now the largest single magnetite ore underground mine in China.Based on the recent several years' mining practice of the first ore section in Makeng Iron Mine, a detailed secondary delineation of the orebody was conducted through the detailed production exploration, combination of exploration and production and utilization of development, cutting and extraction works, further deepening the understanding of the orebody.The production exploration of the middle ore section in this mine for cost reduction and efficiency increase is described, including the exploratory grid, influential factors, combination of production and exploration and reasonable optimization, which aims to further enhance the production exploration and to make an efficient rational utilization of mineral resource.
    Structural Relation between Tieshanmiao and Shimenguo Ore Sections in Tieshan Deposit
    WEN Qi-Fu, WANG Hai-Jun
    2009, 39(08):  87-90+96. 
    Asbtract ( 1886 )  
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    The structural relation between Tieshanmiao and Shimenguo ore sections in Tieshan deposit was mostly deduced with insufficient structural geological data, directly affecting the underground mining design.Therefore, the deposit geology was analyzed, the problems in understanding the structural relation between the two ore sections in the original geological report were found out and the method for studying their relation was determined.Firstly, reflected wave seismic exploration and electrical depth sounding were used to found that the original F13 thrust fault was in fact F13 normal fault; secondly, the drilling was used to directly control the connecting site of the two sections, founding that F13  fault was a normal fault.Meanwhile, a new F701 normal fault was found to the north of F13.F13 and F701 normal faults and F4 normal fault in the south base of the Tieshanmiao ore section have jointly formed Tianluozhuang faulted graben.
    Thinking on the Results of Deep Resource Exploration and Selection of Mining Transition Mode
    LI Xin, LI Ze-Ying, XU Yan-Chao, LIU Wan-Shan
    2009, 39(08):  91-92+96. 
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    The results of the geological exploration of deep resources at Miaogou Iron Mine are described, including the country rock properties, occurrence, thickness, wedging out, ore properties, structure and texture, and iron ore quantity of orebody II.The problems and solutions of this exploration and the issues needing to be considered after this exploration are discussed.Based on this, the economic benefits of the two methods of the transition from open-pit to underground mining are compared and it is concluded that the most rational plan is to transit the mining to underground at 372 m level.
    Design and Application of the Intelligent Control System for Mine Safety and Power Saving
    ZHAO Zhi-Gang, LIU Jie, ZHANG Jun, WANG Chen, WU Peng
    2009, 39(08):  93-95. 
    Asbtract ( 2023 )  
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    The power supply system for electric locomotive was always at the supply mode generally no matter whether the locomotives were at work or not in underground mines, which caused not only a large amount of power loss and leakage but also serious hidden danger to workers' personnel safety.A kind of intelligent control system for mine secure power saving has been therefore designed, which can automatically cut off the power supply when all electrical locomotives of a line are stopped and automatically resume the power supply when a locomotive starts.The practical testing indicates that the system has an evident electricity-saving effect while ensuring a safe underground operation.
    Study on the Virtual Simulation of Ride Comfort of Mining Dump Truck
    CHANG Lu
    2009, 39(08):  97-100+129. 
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    A 3D modeling software-UG was used to establish the physical model of the frame and its finite element model in ANSYS and create and import the frame elstomer neutral file into ADAMS.The 3D geometric models of the components on the frame such as front axle, rear axle, tie-rod and A-frame were also created and imported into ADAMS, where the models for the tires and the front and rear suspensions were also established.Based on this, the rigid-elastic coupling dynamics model of the vehicle was established.Harmonic superposition method was used to generate a C-class road model.The ride comfort at the speed of 10 km/h, 20 km/h, 30 km/h and 40 km/h on a random road was tested.The acceleration in fore-back, right-left and vertical directions of the driver seat on the C-class road was simulated by using the rigid-elastic coupling dynamics model.The comparison between the results of the virtual test and real driving test shows that this rigid-elastic coupling dynamics model has sufficient accuracy to provide a basis for the design of mining dumping truck.
    Study on the Speed Adjusting Control System for Mine Electric Locomotive
    WANG Shu-Fang, YANG Zhi-Yong, XI Wei
    2009, 39(08):  101-105. 
    Asbtract ( 2083 )  
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    Direct torque control was employed as the speed adjusting control strategy for mine electric locomotive based on the analysis of AC/DC speed adjusting methods.A deep theoretical study was made on the direct toque variable-frequency speed adjusting control system and a corresponding simulation model for mine electric locomotive was established by Simulink dynamic simulation tool in MATLAB.The simulation results show this system has a rapid torque response and good high speed performance.Based on this, an experiment platform of the speed adjusting system for mine electric locomotive was set up by a combined use of TI's TMS320LF2407DSP and IPM.The experiment results and the site testing indicate that this control system has the advantages of high traction force, good speed adjusting performance, easy maintenance and energy conservation.
    Research on the Monitoring of Underground Mining Personnel
    LI Dan, WANG Chao, QIAN Jian-Sheng, LIU Dan
    2009, 39(08):  106-110. 
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    Detecting and tracking moving objects in the dangerous area of underground mine plays an important part in coal mine monitoring system, which can issue early warning and prevent dangerous accidents in combination with an interlocking system.For the objects moving in environment with slowly changing or suddenly changing illumination, it is proposed to realize the detection by an improved on-line adaptive learning rate Gaussian mixture model in combination with frame difference, and the background modeling method in combination with color gradient and mathematical morphology, and to remove the shadow by HSV color model, thus enabling a rapid and accurate location of moving object.
    Realization of the Light-Weight Design of SGA3723 Mine Truck's Body
    SHI Jin-Peng, YANG Zu-Yi
    2009, 39(08):  111-113+129. 
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    The problem of a too large size of the mine truck's body structure was solved by a finite element model established by using CAS and FE grid division methods.The body is a large structural component of a mine truck and its weight amounts to one forth of the whole deadweight of SGA3723 mine truck.The light-weight design can reduce the deadweight of the whole truck and therefore, is of importance in the design, which can also help save both the material and fuel oil.
    Computer Implementation of the Hydraulic Calculation for Tailings Transport
    WAN Jun-Li, ZHAO Yu-Xin, LI Xu-Zhong
    2009, 39(08):  114-115+118. 
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    The computer implementation of the hydraulic calculation for tailings transport is explored by combining its calculation analysis with computer operation.The program is designed with Visual Basic and the computer will automatically carry out the calculation and output the design calculation when the parameters are entered.The method can obtain high precision calculation results and is of great practical value.
    Industrial Test of T-GCT Separator in Litie Concentrator
    YANG Shu-Chun, SHEN Jun-Hai, HAN Wei-Xin
    2009, 39(08):  116-118. 
    Asbtract ( 1824 )  
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    New-type T-GCT high-performance permanent magnetic drum separator has characteristics of big magnetic angle, long magnetic belt, different magnetic functions, uniform gradually-varied magnetic fields, and strong magnetic fields with water rinse devices for concentrates.An industrial comparative test of T-GCT Separator in Litie concentrator with on-site ordinary permanent magnetic drum magnetic separator is carried out.The results show that the Fe recovery can be improved by 1.48 % and 0.56% respectively with T-GCT separator at stage1 and stage 2 of roughing concentration, yet the concentrate grade can be improved by 0.96 % at stage 3 of cleaning concentration.
    Study on Enterprise Logistics Reorganization and Competitive Power
    GAO Xu-Xiang
    2009, 39(08):  119-121+139. 
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    In light of the present situation of Tongguan Logistics Co., Ltd.and the problems in its secondary-level units such as low management and service level, doing things in each one's own way and mutual bad competition, a solution is proposed which includes “resource integration, concentrated management and setting-up of logistics branch companies”.The modes of internal and external organization are highlighted.Internal reorganization lays stress on resource integration and concentrated management, which gives prominence to the organizational relation and management levels and attaches importance to market development and client management, aiming to improve the enterprise's comprehensive quality.The external reorganization lays stress on the external contact and channeling.Finally, it is proposed to enhance the dynamic mechanism of enterprise's competitive power by means of logistics reorganization.
    Experiment Study on the Air Leakage Characteristics of the Capping in  Underground Mining Turned from Open-Pit Mining
    DU Cui-Feng, WANG Bin, LIU Zhi-Jun, MEI Lin-Fang, SHENG Jian-Hong
    2009, 39(08):  122-125. 
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    Daye is an underground mine turned from an open-pit one that adopts caving mining method.The serious air leakage from the surface ground during mining process has led to the difficulty in underground ventilation.It was planned to form a capping layer by backfilling with the fragmented rocks and the discarded tailings so as to control the ground air leakage.Based on the laboratory analogue simulation tests, the porosity of the rock particles of four sizes and the air leakage characteristics of the capping were studied and the relationship between the porosity and the cappping height was found, providing not only a theoretical basis for determining the capping height of Daye Iron Mine but also the reference to other similar mines.
    Potential Hazard Evaluation and Treatment of Mine Goaf in Orebody
    DENG Jin-Can, MENG Zhong-Hua, MAO Jian-Hua
    2009, 39(08):  126-129. 
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    According to the detailed investigation results of No.105 Orebody, statistics and classification of the goafs and roadways formed in the private mining of the orebody were made.The size and distribution of goafs were described, their hazard and hidden danger were evaluated, a practical goaf treatment plan was worked out and a ground pressure monitoring plan for the goaf treatment process was also formulated.In the nearly one year goaf treatment, the goafs treated have all reached or exceeded the expected results.
    Optimization of the Control System for Acid Drainage Treatment in Dexing Copper Mine
    YAN Rong-Qing
    2009, 39(08):  130-131. 
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    Dexing Copper Mine is the largest open-pit copper mine in Asia.The acid drainage produced in its mine slope, workface and dump is characterized by many pollution sources, wide scope and greatly varying water quality, leading to a great difficulty in the control of acid drainage treatment system.The paper mainly describes how the mine has controlled and reduced the acid drainage production and discharge, and improved its treatment capacity by the control system optimization of acid drainage treatment and the adoption of source reduction, process control and end treatment methods.
    Design and Application of the Integral Dust Control System of an  Ore Discharge Station in Dongguashan Copper Mine
    WU Jiang, WU Leng-Jun
    2009, 39(08):  132-134. 
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    In light of the serious dust pollution in the ore discharge station at -580 m level in Dongguashan Copper Mine, an integral dust control system was proposed, which is composed of three parts: high pressure fog spraying system for depressing dust, ventilation system for dust exhaust and set-limit spraying system.The high pressure fog spraying system has thoroughly solved the dust pollution in ore discharge at this level, raising the dusting efficiency by more than 80% at this level and also improving that of other levels; the application of ventilation system can reduce the dust concentration at this level to below 20 mg/m3 within five minutes of the ore discharge at other levels; and the application of set-limit spraying system has reduced the dust concentration by more than 70% after passing the water curtain.The practical application of this system has achieved remarkable results, which can be the reference to other similar mines.
    Safety Evaluation and Risk Management of Tailings Reservoirs
    XU Hong-Da
    2009, 39(08):  135-139. 
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    The risk management and evaluation of tailings reservoirs lack both legal conditions and technical basis.A risk evaluation system should be set up based on their failure probability analysis and the economic and life loss of tailings reservoir failures.The engineering safety of tailings reservoirs should be related with the economic development and public safety in the downstream area, and the non-engineering measures capable of reducing the downstream risks should be stressed.The main objectives of this system include: establishing a complete legal system; gradually forming a systematic and perfect system of analysis theory, method and technology; setting up a risk standard for the acceptable risks and tolerable risks of tailings reservoirs; evaluating the losses of downstream personnel, economy, society and environment, judging the risks of tailings reservoirs and working out the guidance for various emergency rescue plans.
    Construction and Evaluation of the Safety Standardization in Metal and Non-metal Mines
    HOU Qian, WANG Yun-Hai, CHENG Wu-Yi, CHENG Chun-Hua, WANG Lu-Ming
    2009, 39(08):  140-142+148. 
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    The paper analyses the problems in the safety production of China's metal and non-metal mines at the current stage, illustrates the necessity of carrying out the safety standardization in these mines and its significance, outlines the basic contents in the construction of safety standardization and describes systematically the whole process of safety standardization rank evaluation.It is concluded that the construction and evaluation of safety standardization in metal and nonmetal mining enterprises can consummate the supervision system of China's safety production, and will improve the enterprises' ability of safety production and promote the safety standardization process in China's mining industry.Moreover, suggestions on implementing the safety standardization are made, including enhancing the publicity and education of safety, strengthening the surveillance to the evaluation institution, and specifying the execution measures.
    Application of Non-coal Mine Safety Appraisal in Mine Site Selection
    SHI Yong-Guo
    2009, 39(08):  143-144+157. 
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    The application of non-coal mine safety appraisal in mine site selection is described.Based on the real conditions of a non-coal mine in Zhejiang Province and its features and data, qualitative and quantitative analysis and forecast were made on the possible dangers and harmful factors of the construction project to determine its compliance with the safe production-related laws, regulations, rules and standards and forecast the possibility and damage of accidents.As a result, an adjustment plan was proposed for the original mine site selection.Non-coal mine safety appraisal can provide reference to the related government sector and guidance to the mine capital construction and future mining in relation to safety technology.
    Synthesis of Starch Derivatives DSX and its Effect on Removal of Heavy Metal Ions
    LU Dong-Liang, XIA Lu, WANG Lei
    2009, 39(08):  145-148. 
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    The starch derivatives DSX was synthesized by graft copolymerization and sulphonation of cross-linking starch and acrylamide with the center of Nitrogen.And its structure was analyzed by the Infrared spectra.An investigation on simulated heavy metal wastewater with 20 mg/L of Cu2+，Pb2+，Zn2+，Cd2+ was studied by using the starch derivatives DXS.It was showed that the average removal rates of Cu2+，Pb2+，Zn2+， Cd2+ were 99.5%，99.4%，99.0% and 99.2% respectively at temperature of 20 ℃, pH 7, DXS of 1.5 g/L for 20 minutes.
    Factors for Removal of Zinc Cation from Aqueous solution by Bentonite
    MENG Qing-Mei, SUN Chen-Guang, LIU Xiao-Dong, DING Shu-Li
    2009, 39(08):  149-152+178. 
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    The removal of zinc cations from aqueous solution by Ca-bentonite and Na-exchanged bentonite was studied.Such factors of affecting the adsorption of bentonite as the initial concentration of Zn2+, the liquid-to-solid ratio, pH value, adsorption time, stirring speed, temperature, and bentonite particle are investigated.The results showed that the removal of Zn2+ by Ca-bentonite and Na-exchanged bentonite can be equal at 2 h.The removal rate of Zn2+ by bentonite can be improved in various degree by increasing pH value, adsorption temperature, stirring speed, time extension, and decreasing bentonite particle, the initial concentration of Zn2+, and the liquid-to-solid ratio.In a complex system, Pb2+ has not influenced the removal of Zn2+ by both of bentonites, while Cr6+ can decease it.
    Research on the Start-up and Process Properties of Rotating Biological Contactor for Acid mine Drainage Treatment
    WANG Ying-Gang, SUN Li-Na, WEI De-Zhou
    2009, 39(08):  153-157. 
    Asbtract ( 1947 )  
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    The rotating biological contactor is a high efficient immobilized device for microorganism which is suitable for treating the acid mine drainage.The process conditions of the start-up and stabilizing stage of rotating biological contactor are studied.The test result shows that the start-up of reactor can be affected by six consecutive cultivations with 10% inoculation amount.With the repeated biofilm forming process, the cycle of Fe2+ oxidation is shortened continuously, from the initial 100 h to 70 h, and meanwhile, the biofilm's capacity of Fe2+ oxidation tends to become stable.The impact of the hydraulic retention time, rotating speed and inlet concentration on Fe2+ oxidation rate in a stable treatment process for acid mine drainage was investigated.The results show that are the best, the 4 h hydraulic retention time and the 7 r/min rational rotating speed.
    Test on the Production of Iron Oxide Red with Meishan Pyrite Cinder
    BAO Yong-Ming
    2009, 39(08):  158-162. 
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    To improve the additional value of the pyrite cinder of Meishan Iron Mine, test was made on producing iron oxide red by beneficiation process consisting of screening, pre-grinding of screen undersize fraction, rinsing, ultra fine grinding, reverse flotation of carbon, sulfur, calcium and magnesium, and reverse flotation of silicon.Iron oxide red of magnetic material grade containing 98.19% Fe2O3 and 0.48% SiO2 and that of pigment grade containing 95.06% Fe2O3 and 0.83% SiO2 were obtained, and the screen oversize product and the froth product of reverse flotation can be directly sold as iron concentrate.
    Research on the Recovery of the Tailings for a Sichuan Pyrite Mine
    WANG Shu-Hong, DONG Feng-Zhi, SUN Yong-Feng
    2009, 39(08):  163-166. 
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    The tailings of a Sichuan pyrite mine have a rather high sulfur content, leading to not only the waste of resource but also a serious pollution to the environment due to the large amount of acidic water produced in their long term deposit.Therefore, research was made on their retreatment.They were ground to 64.76% -0.074 mm and treated with a flotation process consisting of one roughing, one scavenging and two cleanings, where lime was used as regulator, ethyl xanthate as collector and 2# oil as frother.A sulfur concentrate with an 8.90% yield, 45.31% S grade and 83.11% S recovery was obtained and the pyrite cinder of which has an iron concentrate of about 60% and can be directly sold as iron concentrate
    Experimental Study on Recovering Gold from Gold Tailing Resources
    SUO Ming-Wu, REN Hua-Jie
    2009, 39(08):  167-169. 
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    The closed Maqiaogou tailing reservoir in Jinqu Gold Mine of Henan Jinqu Gold Co., Ltd.owns about 1.8 Mt tailing resources at an average gold grade of 0.87%.To make use of the tailings, a flotation experiment is carried out.The results showed that a gold concentrate grading 12.49 g/t at an 81.36% recovery was obtained from tailings by a closed-circuit of one stage rough concentration, two stage cleaning and two stage scavenger with butyl xanthate and butyl aerofloat as collector and copper sulfate as activator under regrinding of 78% -200 mesh.
    Tests on Copper Separation in Flotation from Copper Slags of a Smelting Plant
    TIAN Feng
    2009, 39(08):  170-173. 
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    The Influence factors of the matte smelting process, slag cooling method, cooling rate and slag composition on copper recovery in flotation are discussed.It is pointed out that slag cooling method and cooling rate are the main factors that affected the flotation recovery from copper slag.Taking sodium silicate as dispersant and inhibitor, and butyl xanthate and P3 as combinatorial collector, experiments on flotation recovery of copper from copper slag for a domestic copper melting plant are made.Under grinding of 90% -320 mesh, a copper concentrate grading 17.08% at a 56.98% copper recovery was obtained.
    Research Status of Bentonite as Pharmaceutical Excipients
    WANG Gui-Fang, 吕Xian-Jun , QIU Jun, ZHANG Shuai
    2009, 39(08):  174-178. 
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    The paper introduces the research status of bentonite as pharmaceutical excipients, such as suspending agent, adsorbent, filtering agent, ointment bases, emulsifier, cataplasm, bonding agent, inorganic antibacterial agent and some carriers, and points out the future development trend of bentonite as pharmaceutical excipients in China.
    Research Status of Bentonite as Pharmaceutical Excipients
    WANG Gui-Fang, 吕Xian-Jun , QIU Jun, ZHANG Shuai
    2009, 39(08):  174-178. 
    Asbtract ( 1509 )  
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    The paper introduces the research status of bentonite as pharmaceutical excipients, such as suspending agent, adsorbent, filtering agent, ointment bases, emulsifier, cataplasm, bonding agent, inorganic antibacterial agent and some carriers, and points out the future development trend of bentonite as pharmaceutical excipients in China.
    Survey and Analysis of the Cooper Tailing Resources in China
    YU Liang-Hui, JIA Wen-Long, XUE Ya-Zhou
    2009, 39(08):  179-181. 
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    According to investigation on the related data of yield and concentration ratio of copper concentrates over the years, the total mounts of copper tailings in each province and at domestic were calculated and analyzed respectively, and their cluster analysis was made, laying a basic foundation for the development and management of copper tailings resources.