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Table of Content

    15 August 2012, Volume 28 Issue 08
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    Optimizing Experimental Study of Fill Mining Technology
    QIU He-Xiang
    2012, 28(08):  1-4+7. 
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    Optimizing experimental study of fill mining method was done on Zhaoanzhuang iron ore of He Nan Anyang Iron & Steel Group Wuyang Mining Industry Co., Ltd. The results indicated, exposed gap area of stope reduced remarkably, mining safety was assured further, ore mining rate had improved 10%, fill comprehensive cost reduced obviously, economic benefits of enterprise increased significantly.
    Research of Smooth Blasting Effects Control of Open-pit Mine
    ZHANG Wu-Xing
    2012, 28(08):  5-7. 
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    As a kind of means of final slope management of open-pit mine, smooth blasting has been widely applied, through analysis of the optimization of smooth blasting parameters and factors adjustment which effect the smooth blasting, control measures were proposed, provided the reference experiments for final slope treatment of similar mine.
    Application and Optimization of Cut and Fill Stoping Method
    ZHU Da-Peng
    2012, 28(08):  8-9+13. 
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    Applications of point-pillar upward cut and fill stoping method in Liguanji iron ore were expounded, adaptability of this scheme and problems could facing in the practice were discussed and analyzed combined with practical production, suggestion and imagination were proposed on aspects like safety and economic improvement and so on, provided thoughts for continue deep research and optimization of scheme.
    Application of Trench Receiving Ore Open Stope Mining Afterwards Filling Method in Gently Inclined Medium Thick Ore Body
    ZHANG Qing-Tao
    2012, 28(08):  10-13. 
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    On the basis of analysis of mining technical condition of a skarn type gently inclined medium thick ore body, trench receiving ore open stope mining afterwards filling method was proposed, and mining industrial test was done. The result indicated, the technical and economic indexes of new type mining method were good, with ore recovery rate 81.33%, rate of dilution 14.18%,ratio of extraction-to-cut only 8.56 m/kt, explosive consumption 0.34 kg/t .Meanwhile, install drag reduction deflector in drawing chute,using trench receiving ore method and medium-length hole leakage expanding once shaping and hole-bottom initiation technology, could improving ore-drawing efficiency and production capacity effectively and blasting effect.
    Study of Mining Technology of High Sulfur Easy Self-ignition Deposit
    TONG Lei, XIAO Yi-Gai, JIAO Peng
    2012, 28(08):  14-17. 
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    Through the study of technical condition of deposit mining and high sulfur and easy self-ignition characteristics of ore, aiming at the restore exploitation of -375 m middle part closed 908,909 stope of Nanjing Qixiashan Lead-zinc mine because of high sulfur self-ignition, mining technology of high sulfur stope were raised, chose upward horizontal sublevel filling method in mining to solve the self-ignition problem during high sulfur stope mining, so the resources utilization ratio could improved and protective exploitation of mineral resources realized.
    Technological Design of Residual Ore Mining of Tongshan 5# Ore
    LI Xiao-Ming
    2012, 28(08):  18-20+23. 
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    Took Tongshan 5# ore mining technological design as the project example, economic and reasonable stripping ratio were calculated by using price method, elements of open pit slope were analyzed, bench height and final slope angle were the main parameters in open pit slope elements, mining technological design was done, provided references for similar open pit mining.
    Experimental Study on Grinding Aids of a Magnetite in Hubei Province
    XIE Zhi-Peng, CHENG Hai-Yang, MA Meng, TANG Chen, ZHOU Liang
    2012, 28(08):  21-23. 
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    Research was done on grinding effect of 7 kinds of grinding aids to a magnetite in Hubei Province. The results indicated, under the condition of grinding concentration 70%,grinding time 2 min, proper grinding aids were all have remarkable grinding aid effect for grinding of magnetite. Lime, sodium hexametaphosphate, sodium tripolyphosphate, sodium pyrophosphate could increase the content of 0.075～0.045 mm size fraction in milling mineral discharging products greatly; sodium hydroxide, sodium silicate, sodium carbonate could increase the content of -0.045 mm size fraction in milling products greatly. Excess grinding aids not only have no grinding aid effect, instead it is against grinding.
    Improvement of Pellet Property of Hematic Concentrate Powder by Damp Milling Pretreatment
    XI Yu-Ming
    2012, 28(08):  24-26. 
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    Pelletizing and roasting property of 2 kinds of fine iron concentrate powder were studied. The results indicated, indexes of pelletizing property produced by 2# iron concentrate which mainly consist of magnetite ore were much better than 1# iron concentrate which mainly consist of hematite ore. Pellet produced by 1# iron concentrate needed higher preheating temperature and much longer preheating time to get the preheating ball could meet the production request of chain grate-rotary kiln, technology condition was much higher. The test indicated, damp milling pretreatment technology had effects of improving pellet preheating roasting property of 1# iron concentrate remarkably, strength of 1# iron concentrate pellet preheating ball could reach to 725 N through damp milling pretreatment, compressive strength of product pellet reached to 2 861 N, which met the qualified products standard.
    Technological Study on Sulfur Recovery from a Tailings from Copper Processing
    YANG Yun, ZHAO Guan-Fei, DING Sheng-Qiang, LIU Song
    2012, 28(08):  27-28+31. 
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    Sulfur content are much higher in a tailings from copper processing, the main sulfide are magnetopyrite, pyrite and so on, for floatability was inhibited during copper separation operation, so condition tests were done on activator and collector of sulfide minerals flotation as the key point, finally confirmed one roughing one cleaning one scavenging, middlings order return process to handle the tailings from copper processing of sulfur content 2.46%, sulfur concentrate with sulfur grade 35.04% and recovery rate 83.90% could be obtained.
    Extraction and Separation of Y and Eu from Waste Rare Earth Phosphor
    TU Ya-Jie, WANG Xia-Hui, MEI Guang-Jun, LU Ke-Ke, WENG Xiao-Qing
    2012, 28(08):  29-31. 
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    Aiming at different distribution ratio of rare earth elements of waste phosphor in two-phase, rare earth recovery test was done by using solvent extraction separation. Influence of extractant ratio, phase comparison, balance water phase pH and feed concentration to effect were investigated. The best conditions were obtained, naphthenic acid ratio was 25% naphthenic acid +20% isooctyl alcohol +55% sulfonated kerosene, phase comparison 1∶1, balance water phase pH=4.5, concentration of solid to liquid was 0.08 g/mL hydrochloride. Rare earth product obtained after cross-current extraction under these condition, purity of Y2O3  and Eu2O3 was 98.57% and 1.21%,rare earth total content could reach to 99.78%, separation of yttrium and europium was realized.
    Limit Equilibrium Analysis on Stability of a Dump and Prevention and Control Measures for Hazard
    YE Zhen-Hua, ZENG Rong, GUO Hong-Dong, LIU Pei-Zheng
    2012, 28(08):  32-34+38. 
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    Took a dump as the project example, on the basis of on-site survey and experiment, dump stability on condition of nature and earthquake were calculated and analyzed separately by adopted limit equilibrium method, revealed this dump in the critical stable state, and prevention and control measures for hazard were proposed.
    Open Pit Slope Stability Analysis under Condition of Concealed Single Gap
    SU Cheng-Zhe, ZHOU Xiong-Chao, KONG Jiao-Jiao
    2012, 28(08):  35-38. 
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    Aiming at the traditional analysis of open pit slope stability under condition of concealed single gap could not reflected rock damage state quantitatively and intuitively, influences of 5 different position concealed single gap below a open-pit slope to slope stability were simulated and analyzed by using Mohr circle. The research indicated, roof of concealed single gap of open pit slope was the weakest area in gap, slope was much stable with the distance much longer between concealed single gap to slope.