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Table of Content

    15 February 2013, Volume 42 Issue 02
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    Similarity Simulation Study of Block Ores Generation in Pillarless Sublevel Caving
    LI Bin, XU Meng-Guo, WANG Ming-Xu, ZHU Ming-De
    2013, 42(02):  1-6. 
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    In order to solve the problem of high big block ratio in Chengchao Iron Mine, similar material simulation tests as laboratory are made to simulate medium-deep hole blasting in different parameters based on similarity principle.And an optimal blasting program was maked.Mathematical analysis was made based on data obtained from tests.The results showed that blasting effect of single-roe hole is better than that of double-roe hole and the optimal blasting program is single row dual 12-hole with breaking interval of 1.8 m.This provides a scientific basis for making a program to decline big block radio.
    Thickness Determination of an Iron Mine's Horizontal Barrier Pillar under the Desert's Extra Aeolian Sand layer
    QIAO Deng-Pan, HOU Guo-Quan
    2013, 42(02):  7-9+17. 
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    With weak surrounding rock，the ore body of an iron mine exists under the extra aeolian sand layer. Due to its small particle size and good liquidity，the caving method easily results in high dilution rate and loss rate. To ensure the safe and high-efficient mining of the lower ore-body，the project that keeps some horizontal barrier pillars under the contact surface of the Aeolian sand layer and ore body is put forward. The reasonable thickness of the horizontal barrier pillar is determined with the combination of the empirical formula and the numerical simulation FLAC3D. The results show that when extracting the 10 m span room without rib pillars by the open sublevel stoping method with subsequent backfilling and "taking one every the other one"，the setting-up 20 m barrier pillars are competent.
    FLAC3D-based Numerical Simulation Analysis on the Sequence of Pillar Recovery
    ZHANG Fei, WANG Bin, GONG Zhi-Zhong, CUI Zhi-Ping, LIU Wen-Gang, JI Jie
    2013, 42(02):  10-13. 
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    How to arrange the sequence of pillar recovery is of great significance to keep the stability and safety of surrounding rocks in mined-out processing. The sequence becomes the key issue to study the goaf treatment. FLAC3D numerical simulation is adopted to simulate four kinds of pillars' recovery at No.2 goaf in Dongshenmiao lead-zinc deposit, that is, from one end to the other, from two ends to the middle, interval mining, and from the middle to both ends. Through contrasting and analyzing, a more rational recovery sequence of from the middle to both ends is obtained, which can guarantee the production safety.
    Mining Method Optimization of Sharply-inclined Thin Ore-body in Alpine High Altitude Area
    CAO Shuai, SONG Wei-Dong, ZHU Xian-Hong, QI Wei
    2013, 42(02):  14-17. 
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    According to the special mining conditions of sharply-inclined and thin ore-body in the alpine high-altitude area, based on several conventional mining methods for sharply inclined and thin ore-body, and taking the 11 factor indicators that impact mining method into consideration, the weight matrix of corresponding mining method is calculated out with the use of analytic hierarchy process.Meanwhile the linear functions and the binary comparison sorting method are adopted to determine the index membership matrix, building a comprehensive evaluation index model.It is concluded that medium-hole mechanized mining method with subsequent waste rock filling is superior, and the heavy labor problem in Qinghai Plateau is solved as well.
    Study of Reasonable Development Project Based on Effective Development Roadway
    LI Jun-Chao, XU Meng-Guo, WANG Ping, ZHU Ming-De, XIE Feng
    2013, 42(02):  18-21. 
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    Based on ore body occurrence，the relationship between development ore reserves and development engineering quantity was established，a concept of effective development roadway was put forward. From two aspects of the remain period of development ore reserves and the mining descending speed，the development system of typical metal mine was analyzed，showing as insufficient development ore reserves and delay development project. According to the effective development project，mine development project and development ore reserves were optimized，concluding that the development project index needs to increase.
    Research of Mining Sequence in Deep Mining at Jinshandian Iron Ore based on Three-dimensional
    ZHANG Xiao-Yi, ZHANG Hong-Jun, WANG Wen-Jie
    2013, 42(02):  22-26. 
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    In order to solve the high ground stress problem of deep mining faced by Jinshandian iron mine of Wusteel Group，and based on the analysis of occurrence characteristics of deep deposit and physical-mechanical properties of ores，4 kinds of mining sequence schemes were put forward，and the three-dimensional Elastoplastic FEM software was adopted to make numerical simulation on these four schemes.The sublevel stress distribution and safety factor for each scheme were analyzed，and the results showed that the downward and eastward mining sequence is conducive to realize the safe and highly efficient mining for deep ore body.
    A Technique to Control Frozen Hole In-rushing Water of Deep Freezing Bedrock Shaft
    LU Gen-Kui, SHAO Hong-Qi
    2013, 42(02):  27-31. 
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    Against the frozen hole in-rushing water hazards technical problems of deep freezing bedrock shaft in west area of china，based on the analysis of frozen tube annular water-transmitting channels formation and in-rushing water mechanism，a new technology to control deep freezing bedrock shaft frozen hole in-rushing water disasters thoroughly is innovatively presented which drives small section annular roadway in the stability rock stratum outside the frozen wall below the upper aquifer，probe and expose the frozen tube and then seal frozen hole in the annular roadway，concrete backfill in the annular roadway to form a annular confining bed，and cut off the annular water-transmitting channels thoroughly.Taking the shaft frozen hole in-rushing water disasters control project of Hujiahe coal mine for example，such means as theoretical analysis，field investigation，numerical simulation，field monitoring are applied to study the key parameters about reasonable rock stratum of annular roadway，the reasonable distance from shaft wall，section of roadway，mode of drive and support.The probing techniques of ground penetrating radar，electrical detection and pipe line locator are adopted to probe the position of frozen tube.The formation and subsidence monitor results indicated that the surrounding rock of roadway was stability.Engineering practice verified that the technique could control the frozen hole in-rushing water of deep freezing bedrock shaft thoroughly.
    Research of Impact of Underground Mining on Slope Stability of Open Pit
    GE Yong-Yong, Zhang-Hong-Bing, ZHAO Hong-Bao, ZUO Jian-Ping, XING Jun-Long
    2013, 42(02):  32-35+38. 
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    Both movement characteristics of the roof strata belonging to underground mining and slope stability of open pit when the remaining coal resources of open pit slope are recovered by underground mining in Antaibao open pit are studied by numerical simulation software FLAC3D.The results show that the evolution law of the compressive stress and compressive strain of open pit slope are shown by nonlinear decreasing trend as the different distance away from the ground stop line of open pit.Stress concentration of the roof is shown by asymmetric and compressive strain of the roof is reduced by nonlinear trend as the continuous underground mining.Tensile stress zone obviously biased the free end direction of open pit slope will be produced.Both the extrusion and movement caused by overlying rock and soil of open pit slope and the deterioration effect on the bottom rock mass of open pit slope caused by mining are the key factors leading to the open pit slope slip.There is a theoretical size for underground mining which can maintain the open pit slope safe and make the coal be recovered as much as possible.
    The Block Caving Mining of Irregular Residual Ores in a Wide Range of Potential Accident Area
    CHEN He, WANG Hu-Xin, YANG Wei-Zhong, LUO Xian-Wei
    2013, 42(02):  36-38. 
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    The mining conditions in No.92 orebody of Tongkeng Mine are complicated with a wide range of potential fire accident area. Based on the characteristics and law of roof caving in multilayer orebody mining，a reasonable mining sequence for residual ore is developed. The block caving mining technology is characterized by bundle-holes with large parameters，the drilling chamber arranged into tunnel，and high-layer stoping and large and thick roof-exposing caving as well. In industrial tests，the production capacity reaches 2 237t/d with the dilution rate of 13.5% and the loss rate of 9%.
    Study of Calculation Method of Open-pit Mining Bottom Width and Mining Depth in Yulong Copper Mine
    ZHAO Wen-Kui
    2013, 42(02):  39-40+43. 
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    According to the special characteristics of ore-body in Yulong Copper Mine, the traditional calculation methods for open-pit mining bottom width and depth are improved. As calculating the open-pit mining bottom width and depth of Yulong Copper Mine, the smallest bottom width is put on the lowest end of the orebody. With minimum bottom width increasing by the integer times, the stripping ratio at every increase is calculated out to find an economic reasonable one. Then, the reasonable open-pit mining bottom width and mining depth are achieved for Yulong Copper Mine.
    The Slope Parameters Optimization and Stability Analysis of Qidashan Waste Dump
    WANG Rui, WANG Yong-Zeng, LU Zhan-Guo
    2013, 42(02):  41-43. 
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    With the waste dump at Qidashan Iron Mine of Anshan Iron & Steel Group Corporation as background，in view of its inadequate dump capacity，and based on analyzing its engineering geological environment，the parameters of the waste dump are optimized to determine the slope parameters of the waste dump. By this method，the capability of waste dump is increased with the economic benefits of open pit mine improved.
    Ground Pressure Behavior of Fully Mechanized Top-coal Caving Face based on Simulation Test
    ZHENG Jin-Ping, FENG Yan-Jun
    2013, 42(02):  44-46. 
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    In view of research situation of the fully mechanized top-coal caving, the simulation test model for fully mechanized top-coal caving was presented.With the top-coal caving process promoted, the variation of top-coal subsidence and abutment pressure was measured and the ground pressure behavior of fully mechanized top-coal caving was analyzed consequently.The test results showed that the top-coal subsidence improved slowly, nearly sharply, moderately and sharply.The peak abutment pressure initiated to decay and the periodic weighting of basic roof appears relatively moderate.Due to the action of “cushion” at the upper support, the ground pressure appears moderately.
    The Integrated Practice of Medium-depth Hole Blasting in Open-pit Mining and the Treatment of Underground Goaf
    JIA Bao-Shan
    2013, 42(02):  47-49+52. 
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    After years of mining，there exists a large number of underground goafs in Sandaozhuang Mine. These underground goafs scatter widely with the complex form，and have become the main potential safety problem of mining production. On the basis of analyzing the geology of the northern burst area around 1330m terrace，the distribution features of underground goaf areas can be got through drilling in the blasting area. Based on the real bench situations，the medium-deep hole blasting in the usual bench is simultaneously carried out with treatment of underground goafs in the blast area，which integrates the blasting work and the goafs treatment. A good blasting effect was obtained with micro differential hole-by-hole blasting network. This method can ensure the production work in the bench and get rid of potential goaf safety problems at the same time.
    Numerical Simulation Research of the Soft Rock Roadway Support in Yechangping Molybdenum Mine
    SUN Xiang-Xin, MING Shi-Xiang, QIN Shuai, YAN Rong-Fu
    2013, 42(02):  50-52. 
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    The natural caving mining method is adopted by Yechangping molybdenum mine, its bottom structure is layout in the extremely unstable oxidation ore in production process.Serious damage of the headings results that the ore drawing can not work normally.FLAC software is used to make numerical simulation to simulate the form of support and calculate the support parameters in order to contrast different schemes.This research provides an important basis for determining the support scheme and parameter.
    The Optimization of Implementation Plan for Construction of Zhangjiaxialou Iron Mine
    WANG Li-Gen
    2013, 42(02):  53-55+59. 
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    With the principles of construction like advanced technology，reasonable overall arrangement，moderate investment，good economic benefits，the optimization potentiality in development system，ventilation system，transportation system，filling system，mining methods，mining equipment in primary construction and implementation plan of Zhangjiaxialou iron mine are carried out.Therefore，the whole production system become more reasonable and smooth through further optimization for above hands.Capital quantities and capital investment are obviously reduced with construction scheduling speeded up and construction period shortened.
    Research of Mining Technology for Songpingpo Underground Slate Mine
    LIN You
    2013, 42(02):  56-59. 
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    The mining technology of turning upward layering and chaplets & wire saw filling method was adopted in accordance with the specific circumstances of Songpingpo underground Slate Mine，considering many advantages about chaplets & wire and combining with the goaf disposing method as well.The scheme was applied in the mine and the result showed that this mining method increased production efficiency，reduced production costs，ensured safety of stoping and favored environmental protection.It has high application value and produces good economic benefits.
    Weak Structural Plane on the Blasting Effect and the Control Measures
    HE Tie-Zhu, CHI 恩An, ZHAO Ming-Sheng
    2013, 42(02):  60-62. 
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    The paper firstly analyzed the reason for the weak structural plane easily producing the adverse blasting effects such as toward blasting，large fragment，toe rock，threshold and so on.Then，according to the practical situation，some technical measures were taken by adjusting the blasting parameters，increasing the charge density in the bottom of the hole，choosing an adaptive blasting location and assisting deep-hole blasting with short-hole.The practical application into engineering indicated that the measures above are feasible and have an important practical value.
    Thermodynamics of Gas Based Reduction of Mechanically-activated Iron Oxides
    BU Lin-Chao-Ke, ZHANG Bang-Wen, ZHAO Rui-Chao, ZHANG Yin
    2013, 42(02):  63-67+76. 
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    For the purpose of revealing the impacting mechanism of mechanical activation on the gas based reduction of iron oxides, the correlation between the gas based reduction thermodynamics and stored energy acquired through mechanical activation for iron oxides is discussed. The result shows that there is a characteristic threshold CO or H2 pressure fraction for each iron oxide reduction. If only the minimum CO or H2 pressure fraction for reduction higher than the threshold value, reduction temperature decreases with the increase of stored energy, otherwise, increases, which renders the mechanical activation for iron oxides is advantageous only to some gas based reductions, while disadvantageous to others, in terms of lowering the reaction temperature. However, the minimum CO pressure fraction of CO or H2 for all reductions decreases with the increase of stored energy, which makes mechanical activation be advantageous to all the reductions in improving the gas utilization ratio.
    Cleaning Separation Tests of Magnetite Rougher Concentrate with Water-only Cyclones for Jianshan Iron Mine of Taisteel
    TIAN Juan, FAN Min-Qiang
    2013, 42(02):  68-71. 
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    The concentration tests on low intensity magnetite rougher concentrate of inverse flotation for the concentrator of Jianshan iron mine of Taisteel are carried out by adopting φ50 mm cyclones with the column height of 80 mm and bottom cone angle of 90°. Under conditions of the overflow pipe's immersion depth of 50 mm and diameter of 15 mm, the spigot's diameter of 8 mm, feeding pressure of 0.04 MPa and feeding concentration of 23%, final iron concentrate with yield of 36.03%, iron grade of 69.03%, SiO2 content of 3.89% and the operating iron recovery of 38.94% was obtained. It is confirmed that the cyclones can separate parts of qualified iron concentrate in advance and reduce the amount of feed in inverse flotation so as to lower the separation cost and reduce the environment pollution.
    Study on Improving the Recovery Rate of Reverse Flotation in Preparing Super Iron Concentrate
    FU Gang-Hua, SONG Xiao-Lei, GUO Yu-Feng, ZHOU Jian-Feng, ZHENG Fu-Qiang, HE Jing
    2013, 42(02):  72-76. 
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    The ordinary iron ore used in the production line of super iron concentrate in a Anhui powder metallurgical company is adopted as the raw material to make the the inverse flotation tests for producing the super iron ore with regrinding and low intensity magnetic separation to solve the problems of low recovery due to dodecylamine by adding regulators of Na2CO3, sodium silicate and starch. Then it is discussed that the productivity of inverse flotation is enhanced by improving the pulp concentration. The results show that with combination of 2 000 g/t of Na2CO3, 200 g/t of sodium silicate, 100 g/t of starch and 130 g/t of dodecylamine, the operating recovery rate of super iron concentrate in inverse flotation under 24% of pulp density was increased to 89.58% (89.27% with raw materials) from 44.61% (43.44% with raw materials) when dodecylamine applied alone. When the pulp concentrate is increased to 28%, the capacity of inverse flotation can be improved by 16.68%, and the iron recover still reach 87.69% (87.38% with raw materials).
    Influence of Plateau Environment on the Electropotential Control Flotation of Galena and Sphalerite
    XIA Zhong-Yong, SONG Yong-Sheng, LI Wen-Juan, CHEN Yong
    2013, 42(02):  77-80+93. 
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    In order to give the theoretical basis of the popularization and application of origin potential flotation on lead and zinc mine in plateau area, the pulp potential and buoyancy of galena and sphalerite single mineral in different pH and with agate ball and iron ball as grinding medium are inspected, and compared with that in plain region. According to the investigation results, the conclusion is as follows: Plateau environment can change the original pulp potential of two minerals, thus increasing differences in floatability of the two kinds of minerals (galena floatability better, sphalerite floatability worse), so two kinds of minerals in the plateau environment can reach better flotation separation effect than in the plain environment. Wherever in plateau area or in the plain area, because the iron ion can interfere with original pulp potential when iron ball as grinding medium, the flotation separation effect is worse than agate ball as grinding medium. Then the original potential flotation separation test of artificial mixed mineral proved this conclusion.
    Lead-antimony Recovery from a Lead-antimony-zinc-tin Polymetallic Ore with New Collectors
    ZHU Bin, LU Zhi, CAI Zhen-Bo
    2013, 42(02):  81-85+89. 
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    With self-developed new collector GYY-1 and GYY-3 instead of ammonium dibuyldithiophosphate, collector DY with a blistering performance developed by Guangzhou Research Institute of Nonferrous Metals instead of 2# oil, the problem of the worsening lead-antimony concentrate index in recent years in a Guangxi lead-antimony-zinc-tin polymetallic ore was solved without changing the on-site processing. In laboratory tests, Pb+Sb grade in lead-antimony concentrate was increased by 2.91%, and lead and antimony recoveries increased by 6.47% and 4.23%. In industrial applications, Pb+Sb grade in lead-antimony concentrate was increased 0.85%, and lead-antimony recovery increased by 3.75%. According to the industrial applications, it is expected that the annual economic benefits of 13.23 million yuan be gained with the new collectors in concentrator.
     Effect of Different Comminuting Process on Grindability and Molybdenum Flotation of Bangpu Mo-Cu Ore
    YIN Wan-Zhong, HOU Ying, DING Ya-Zhuo, YAO Jin, WANG Yu-Lian, LUO Xi-Mei, SUN Da-Yong
    2013, 42(02):  86-89. 
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    Bangpu molybdenum-copper ore from Mozhugongka County, Tibet was crushed by high pressure grinding rolls(HPGR) and the traditional jaw crusher. The particle size characteristics of the two crushing products were analyzed, the work indexes of ball mill for two different crushing manner were measured, and the effect on subsequent ball milling-molybdenum flotation by different comminuting manner were studied. The results showed that the fine fraction content of crushing products by HPGR is much more than that by jaw crusher and its particle size distribution is more uniform. The Bond work index of ball mill for the products by HPGR is at least 9.05% lower than that by jaw crusher. The best grinding fineness by HPGR is 65% of the products lower than 0.074 mm, while that by jaw crusher is 75% lower than 0.074 mm. Meanwhile, the Bond work index of ball mill by HPGR is 10.87% lower than that by jaw crusher, but molybdenum recovery by HPGR decreases by 2.32%.
    Experimental Research on Extraction of Vanadium from Vanadium and Nickel Leaching Molybdenum Polymetallic Ore of Nickel and Vanadium
    QIN Hong, XUE Wei, JIE Tian, JIN Yang-Hua, ZHANG Ren-Zhong
    2013, 42(02):  90-93. 
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    With P204 as extractant and sulfuric acid solution as stripping agent, the extraction-stripping tests for vanadium recovery at room temperature from nickel-vanadium leaching solution of a Guizhou Mo-Ni-V polymetallic ore was carried out to determine the optimal technical parameters. Under the technical parameters in extraction of the mother liquid pH 2.5, the volume ratio of P204, TBP, sulfonated kerosene for 20∶5∶75 in organic phase, phase ratio (O/A) for 1∶2 and extraction time for 5 min, and the stripping conditions of sulfuric acid concentration 2 mol/L, phase ratio (O/A) for 2∶1,the stripping time for 4 min, the extraction rate of vanadium reached 98.7%, with total stripping of 99.8% and the total recovery of 98.5% after 5 stages of extraction-stripping process.
    Study on Process Mineralogy of A Clay-vanadium Ore in Shanxi
    ZHANG Li-Li, LIANG Dong-Yun, LI Bo, HONG Qiu-Yang
    2013, 42(02):  94-96. 
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    Process mineralogy of a clay-vanadium ore in Shanxi was investigated by research methods of chemical analysis, microscope, automatic quantitative mineral technology（MLA）to focus on identifying the mineral composition and content, the occurrence of vanadium, and the disseminated state and particle characteristics of main minerals containing vanadium in the ore. These results provide the detailed information and theoretical basis for pre-concentration of the vanadium ore. The results indicate that the content of V2O5 is 0.85%, which is relatively low. Vanadium exist as isomorphism mainly in mica type minerals（sericite, biotite and chlorite）, and a small amount of limonite. The expecting recovery of vanadium by separation of mica and limonite is 88.25%. But the grinding dissociation of these minerals is difficult because these are quartz inclusions in their schistosity.
    Alteration Characteristics of Yili Mo Deposit and its Prospecting Significance
    DUAN Dong-Sheng, HUANG Fan, LIU Cui-Hui, XIE You-Wei, ZHENG Bing-Hua, LI Song-Bai
    2013, 42(02):  97-100. 
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    On the basis of the field research，drill core recording and rock and mineral identification，the main alteration types in Yili Mo deposit are divided into silicification，potassic alteration and sericitization，among which the silicification and quartz sericitization are closely related to mineralization. Meanwhile，the alteration zoning map in plane and profile are completed，mainly including two alteration zones of quartz-sericite-pyrite (phyllic alteration) and chlorite-epidote-calcite (propylitic alteration) which is characterized by superimposed hydrothermal alterations，comparing to characteristics of alteration zoning in typical porphyry deposits at home and abroad. That is to say，the early silicification has been superimposed by post quartz-sericitization and the latest carbonatization. According to these characteristics of alteration，the conclusion is that F4 fault might be a reverse fault controlling distribution of orebody，and implying a concealed Mo orebody existed in the fault footwall. According to the relationship of alteration and mineralization，the deep area in the southern section of the main mining area is the most promising molybdenum mineral exploration area.
    Geochemical Characteristics of Pb Isotopes in Duobuza Copper Deposit
    HE Yang-Yang, WEN Chun-Qi, LIU Xian-Fan, ZHOU Yu, GUO Jian-Qiang
    2013, 42(02):  101-104. 
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    8 pieces of ore samples from 2 304# and 2 312# drillings in Duobuza copper deposit of Tibet were selected to test their Pb isotopic composition. The test analysis showed that with the drilling depth increasing，Pb isotope ratios in the strata and porphyry are constantly improving on the whole，and Pb isotopic ratio in the ore-bearing strata is higher than that in ore-bearing porphyries. Lead comes mainly from the subduction zone of the crust and the mantle and partly from the orogenic belt. And its tectonic background is in the arc environment.
    REE Geochemical Characteristics and Significance of Longtoushan Gold Deposit
    HUANG Qiu, CHEN Yuan-Rong, WANG Kai-Lang, LIU Yi-Zhi, LIU Wei
    2013, 42(02):  105-107+125. 
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    Through the preliminary study of the different geological body rock of rare earth geochemical characteristics in Longtoushan，it is found that no matter the total of the rare earth，the distribution patterns，or features of δ（Eu）value，which indicate，gold ore bodies in the region are the most similar to the quartz porphyry and breccia，and gold and quartz porphyry，breccia in the long geological process has inherited the characteristics of evolution with a close mineralization relationship. Therefore，during the prospecting and exploration of Longtoushan gold mine in the future，Longtoushan gold ore should carry out the work according to the mineralization characteristics of middle-low temperature secondary volcanic post thermal type gold ore. Except for ore-prospecting in porphyry，other ore prospecting at favorable tectonic section should be paid attention.
    Safety Evaluation for Mining Equipments Based on PCA
    JIANG Meng, MA Hong-Lian, CHEN Dong, LI Wei
    2013, 42(02):  108-111+114. 
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    Mining equipments as an important part in mining safety production, play a vital role in preventing and reducing the mine casualties, protecting the safety of staff and securing the mine safety. the initial evaluation index system is determined based on the mining equipment safety detection, and the principal component analysis is adopted to analyze comprehensively the testing data of the hoist, drain pump, fan and the air compressor, and then the overall safety of the mining equipments is evaluated comprehensively. Finally，this paper analyzes the pros and cons of the eight mining equipments in safety with the cases. The results show that the evaluation can accurately, objectively, comprehensively reflect the safety situation of mining equipment by PCA.
    Research on Mine Belt Conveying System Controlled by Soft Starter
    LUO Jin-Sheng
    2013, 42(02):  112-114. 
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    Mine belt conveyer is the necessary transport equipment for mine Enterprise. The soft starter can restrict starting current of induction motor and reduce equipment fault rate. With the reference of DC motor double closed loop regulation system，the soft starter system with speed control loop is built. Then，the simulation model and the simulation results of double closed loop soft starter system are present. Based on the double closed-loop control strategy，the hardware structure and the realization of software for the soft starter are proposed.
    Experimental Research of Magnetic Field Screening for Concentration Plant of Batai Iron Mine
    ZHANG Ying-Xin, LEI Qing-Yu, YU An-Zhou
    2013, 42(02):  115-117. 
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    Samples of the rough concentrate of low intensity magnetic separation, the products under high frequency fine sieve and the final concentrate from Concentration Plant of Batai Iron Mine of Wuyang Mining Company are taken to make laboratory experiment on magnetic field screening. The results showed that qualified iron concentrate with iron grade, productivity and iron recovery of above 66%, 82% and 94% was directly obtained by the process of one cleaning separation with magnetic field screening after removing +0.3 mm rough particles of rough concentrate and the products under high frequency fine sieve. For the primary final concentrate, iron grade can be improved from 65.5% to about 68% through the method above. This indicated that the application of the magnetic field screening into Concentration Plant of Batai Iron Mine can reach remarkable effects on simplifying the process, increasing output and saving consumption, and improving the iron concentrate quality.
    Improvement on the Structure of Annular Magnetic Separator
    CHEN Guang-Zhen, JIN Zhen, WANG Pei-Xin, JIANG Cheng-Yang, WANG Hao
    2013, 42(02):  118-121. 
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    In order to solve the problem of high tailings grade in rough magnetic separation with annular magnetic separator, its structures are improved from two aspects: First, the magnetic screen is newly arranged at rough concentration of the annular magnetic separator, and secondly, the ore feed for the annular magnetic separator varied from the center to the periphery. The improved annular magnetic separator is adopted to the rough concentration tests in laboratory for Dagushan iron ores, and contrasted with the original devices. The results show that: in the case of the same concentrate grade, tailings grade is decreased 2.03% with the improved annular magnetic separation, and the concentrate recovery increased by 2.75%.
    Study on Slope Stability using Vegetation Bag Reclamation under Rainfall Infiltration
    LU Ming-Xing, GU Yan
    2013, 42(02):  122-125. 
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    The slope technical parameters using vegetation bag reclamation are introduced in detail，and the simulation analysis on stability under rainfall infiltration is studied by Sweden slice method and simplified Bishop method with the limit equilibrium theory.The research showed that the minimum coefficient of sliding stability under rainfall infiltration is 1.848，which is significantly higher than the codes 1.3 stipulated in.Slopes with vegetation bag reclamation significantly reduced the slope sliding trend，and its stability was remarkably increased.
    Analysis of Factors for Tailings Dams Accidents Causing Disaster at Home and Abroad
    LIU Hai-Ming, CAO Jing, YANG Chun-He
    2013, 42(02):  126-129+134. 
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    Through collecting the data of accidents of tailings reservoir，the relationship between accidents of the tailings dams and the height of the tailings dams，the dam construction technology，and the factors for the tailings dams causing disaster are analyzed. The analysis of 147 accidents of the tailings dams in the world indicates that the major factor for the tailings dams accidents is unusual rainfall，following by earthquake and management etc. The study on 42 accidents of the tailings dams in China shows that the major causes of the tailings dams accidents are the instable tailings dams，illegal construction，unusual rainfall and so on.
    The Optimal Earthwork Allocation in Dump Reclamation based on the
    JING Ming, BAI Zhong-Ke, CUI Yan, ZHANG Ji-Dong
    2013, 42(02):  130-134. 
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    Two DEM models for the dump area before and after the reclamation planning are established respectively to divide the dump area into several digging and filling map spots，calculate the digging and filling earthwork，secondly generate the centers of gravity of map spots and the distance matrix，and finally optimize the earthwork allocation by using the linear programming method.Taking Pingshuo mining inner dump reclamation engineering design as a case，the platform No.1 is selected as a typical area，and divided into 14 digging and filling map spots.The earthwork to be excavated and to be backfilled is 65.02 m3 and 64.89 m3 respectively.With the help of Lingo software，the linear programming method is adopted for the optimal earthwork allocation and the engineering drawing of earthwork allocation is made.
    Foundation Stability Evaluation of Old Goaf Based on Additional Stress and Probability Integration
    WANG Ya-Jun, HE Jiang-Hong, YAN Peng-Yang
    2013, 42(02):  135-139. 
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    A new method that adopts additional stress and probability integration to reasonably evaluate foundation stability is applied to provide a scientific basis for the engineering construction of old goaf.Taking the material base to be built by Shijiazhuang Iron and Steel Company for example, the method is adopted to analyze the impact of engineering construction of old goaf, and the conclusion is that the load of building does not make old coal goaf awake.The residual deformation of old goaf is within the allowable range and almost does not affect to engineering construction.It is basically feasible to construct project above the old goaf, and the evaluation provides a scientific basis to build projects over the goaf.
    Research on Toxic and Harmful Gases Filtering from Mine Refuge Chamber
    WANG Yan-Ping
    2013, 42(02):  140-142+146. 
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    The toxic and harmful gases in mine refuge chamber are analyzed and inspected，including CO2，CO and smelling gases，and a filtering technique and filtering system for the toxic and harmful gases are proposed. With the use of soda lime adsorbent，ACO catalyst and activated carbon，the concentration of poisonous and harmful gases meets the requirement of mine refuge chamber during a series of individual tests and manned tests. The real and valid tests data verifies the filtering technology be feasible，thus providing a heathy environment for refuge staff at underground coal mine.
    Technology of Ventilation and Pre-cooling for Deep High-temperature Roadway of Metal Mines
    WANG Yun-Min, CHEN Yi-Hua, JIA Min-Tao
    2013, 42(02):  143-146. 
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    Based on the energy equation of underground roadway's heat exchange in metal mine，the basic law of underground tunnel's heat exchange is analyzed，as well as the theoretical basis of the mine ventilation and pre-cooling. The practice in Dongguashan Copper Mine approved that the inlet air warm control in roadway improved the roadway's heat exchange efficiency to realize cooling.
    Dust Reduction of High-pressure Spray System to Regional Controlled Recirculation Ventilation Process
    LI Jin-Feng, XIE Xian-Ping, ZHANG Neng-Sheng, JI Cheng-Zi, WANG Yan-Bo
    2013, 42(02):  147-150. 
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    Controlled recirculation ventilation technology can be widely used in low-content gas coal mines, and non-coal mines have the characteristic of low-content gas or no gas, which provide anvantages for the widely use of this technology.As long as dust at circulated air is effectively purified, superiority of this technology will be fully brought into play.In using this technology, it is usually considered that pollutants at recirculation working face is generated continuously and purifier is used to reduce dust at such processes as rock drilling, continuous oredrawing and continuous removal in recirculation ventilation system.After researching on the matching relationship between dust size in recirculation system and particle size of high-pressure spray, the layout form with spray head laying against the wind of 45°down, the diameter of spray head of 1.0 mm, the hydraulic pressure of spraying water of 7.5 MPa, and the interval distance of spray head 0.5m can reduce the dust with particle size of 10μm by 90%, which can meet the dust reduction requirements of circulation system.
    Application of Drilling and Geophysical Prospecting in Detection of Grouting Effects in Goaf Area
    QU Xiang-Yi, LI Xue-Liang
    2013, 42(02):  151-155. 
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    Since the grouting in goaf area is a concealed project, how to control its quality is a big problem.It is difficult to certify the grouting effect via single inspecting method, and a satisfied result can be obtained by adopting the comprehensive tests with various methods under economical and reasonable condition.Combining with a practical project case, the inspection contents, method and data interpretation of grouting quality are studied, thus providing a reference for similar detection project design and construction.
    Waterproof and Drainage Scheme of StopeⅠin Heishan Iron Mine
    WEI Guo-Chang, JI Yong-Kang, MI Juan, ZHANG Xiao-Bo
    2013, 42(02):  156-159. 
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    The paper introduces the geological and hydrogeological characteristics of stopeⅠin Heishan Iron Mine.The waterproof and drainage scheme for open pit is analyzed from the technical and economic index，and the tunnel drainage scheme is taken.Due to the three phases' underground mining，it is determined that the gravity tunnel drainage is adopted at first phase，the direct drainage is at second phase，and then the direct drainage is selected after comparing with the relayed drainage and the direct drainage from the technical and economic factors.
    Experimental Study on Preparation of Autoclaved Aerated Concrete with Iron Ore Tailings in Dashihe Iron Mine of Shougang
    WANG Chang-Long, LIANG Qing, WANG Yan-Jun, NI Wen, QIAO Chun-Yu
    2013, 42(02):  160-163+168. 
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    Experimental study on the preparation of autoclaved aerated concrete(AAC) with iron ore tailings from Dashihe iron mine of Shougang provides a technical basis for comprehensive utilization of iron ore tailings resources. The results showed that under conditions of grinding fineness of -0.08 mm 97.2%, the mixture ratio of iron ore tailings, lime, cement and gypsum at 60∶25∶10∶5, the amount of aluminum powder paste being 0.06% of the total raw materials, liquid-solid ratio of 0.6, the amount of foam stabilizer being 8% of the total volume of water, the slurry casting temperature at 50 ℃, the static curing temperature at 60 ℃ for 4 h, and steam curing pressure of 1.25 MPa at 180 ℃ for 8 h, the autoclaved aerated concrete with strength of A3.5, and density grade of B06 is obtained. X-ray diffraction analysis shows that the main phases in products are 0.9,1.1,1.4 nm tobermorite and some residual minerals in iron tailings.
    Study about Two-stage Neutral-acid Leaching Process on A Zinc-borne Dust
    LI Yan, YANG Li-Mei, XU Zheng, XU Rui, WANG Wei
    2013, 42(02):  164-167. 
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    In order to recycle zinc from zinc oxide of the waste galvanized sheet zinc-borne dust, two-stage neutral-acid continuous leaching process was conducted. Through the conditional tests, the optimal technical parameters for the neutral leaching were determined as the initial acid concentration 0 g/L, the ratio of liquid to solid 9 mL/g, stirring intensity of 200 r/min, the leaching temperature of 25 ℃ for 80 min, for the acid leaching as the starting acid concentration of 20 g/L, the ratio of liquid to solid 9 mL/g, stirring intensity of 500 r/min, the leaching temperature of 25 ℃ for 80 min. Then under the technical parameters above, a closed-circuit test was made by using the neutral leaching solution as output solution, and the acid leaching return to the neutral leaching solution. In the tests, Zn leaching rate reaches 90.36%. Zn content in leaching solution is 10.14 g/L, and iron content is 0.56 g/L only.