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Table of Content

    15 August 2011, Volume 27 Issue 08
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    Humble Opinion on the Situation of China's Iron Ore External Dependence
    LI Jin-Qian, LI Yong-He
    2011, 27(08):  1-4. 
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    The cases of China's iron ore producing and importing in recent years were analyzed. As demand increasing, the price of iron ore was mounting steadily, the cutoff grade of domestic iron ore mine had decreased gradually, which caused the domestic crude ore production was increasing greatly while the concentrate production didn't increase correspondingly, the degree of China's iron ore external dependence was increasing year by year. To solve the problem, China's Iron & Steel Industry should speed up eliminating backward productivity, improve the utilization rate of iron ore during smelting process, increase domestic iron ore production capacity,meanwhile, increase the interest iron ore ratio in imported ore by oversea investment.
    Numerical Simulation on Stability of Layered Roof of Hard Rock
    ZHANG Chuan-Fei, ZHANG Lei, CHEN Jing-Wei, LI Ju-Song, ZOU Qian-Sheng
    2011, 27(08):  5-9. 
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    Roof collapse is one of serious and normal engineering disaster in the underground exploitation process of metal mine. Aiming at the rock properties of layered roof of Sinosteel Group Cangshan Iron Mine, destroy process of strata and influence law of each factors were analyzed. 3-D numerical mechanical analysis model was established by using FLAC3D software. The stress-strain analysis was done on roof, changing destroy law of roof in condition of different delamination-terrane thickness and buried depth and other factors under depth of 50~300 m were studied through numerical analysis software.
    Open-pit Mine Bench Blasting Design and the Application based on Three-dimensional Model
    DUAN Yu-Xian, LI Fa-Ben
    2011, 27(08):  10-12+25. 
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    Based on three-dimensional orebody modeling technology, the blast-hole distributing and blasting network design of open-pit mine bench blasting was studied. Which had been successfully used in blasting project design at 1414 northern bench of Sandaozhuang Open-pit Mine of Luoyang Luanchuan Molybdenum Industry Group Co,Ltd. The result indicated that the blasting design system blasting plan is scientific and effective, and the blasting design working efficiency has been improved greatly.
    Study on the X-ray Radiation Separator and the Separation Technology
    LIU Ming-Bao, YIN Wan-Zhong, HAN Yue-Xin, SUN Zhong-Qiang, YU Jiu-Jiang
    2011, 27(08):  13-14+19. 
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    Study on the X-ray Radiation Separator and the Separation Technology Liu Mingbao1，Yin Wanzhong1，Han Yuexin1，Sun Zhongqiang2，Yu Jiujiang3 1. College of Resources and Civil Engineering，Northeastern University；2. Northeastern University Metallurgical Technology Institute；3. Concentration Plant,Jinchuan Group Ltd. The development history and the working principle of X-ray radiation separator were described in detail, and the separation practical data both at home and abroad in recent years were introduced, the research indicated: qualified tailings with yield high to around 60% could discarded in advance through X-ray radiation separation, could increased the milling grade of dressing plant greatly, economic and technical indexes and comprehensive benefit of dressing plant could improved remarkably.
    New Type Centrifugal Machine and Experimental Study on Fine Tungsten MudSeparation by using this Machine
    XIAO Yuan-Hua, HUANG Wan-Fu
    2011, 27(08):  15-16+19. 
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    Structural characteristics of new type centrifugal machine produced by a company was introduced, and this machine was used in the study of recovery technology of tungsten fine deposit, a lot of discarding tailings of tungsten fine deposit was realized. The research indicated, on the condition of feed ore concentration 20%,ore feeding speed 4 L/s, centrifuge speed 600 r/min, water addition 2 L/min, tungsten fine deposit which the WO3 grade was 0.22%,through the separation of centrifugal machine, tungsten rough concentrate with WO3 grade 0.65% and recovery rate 74.18% could obtained.
    Experimental Study on Gravity Separation-flotation United Technology Beneficiationof a Hard Seperation Gold Ore in Yunnan
    ZHANG Hong-Guo, HU Zun-Bin
    2011, 27(08):  17-19. 
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    A gold ore in Yunnan carbon-based content is high, gold mineral is mainly natural gold, aggregation degree of partial gold and sulfide minerals are high, most of particle size are fine, after enrichment then cyanide leaching technology is suitable to extracting gold.Test research indicated, suitable purifying technology was grinding product which -200 mesh account for 85% table concentrator gravity separation, tailings concentrator one time roughing twice regrade twice scavenging, middling order return process flotation, heavy minerals with gold grade 295.45 g/t,recovery rate 32.65% and flotation gold concentrate with gold grade 42.07 g/t,recovery rate 53.46% could obtained, general recovery rate of gold reached to 86.11%.
    Experimental Study on Beneficiation of a Cobalt Nickel Arsenic Ore in Africa
    LU Wei-Yu, CAI Zhen-Bo, LU Zhi
    2011, 27(08):  20-22. 
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    A cobalt nickel arsenic ore in Africa contains nickel 3.05% and cobalt 0.23%, on the basis of ore technology mineralogy research compeletion, test principle process of jigging gravity separation-flotation was drafted pointed, experimental study indicated, through jigging pre-discarding tailings, one time roughing three times scavenging twice regrade, middling order return flotation, this nickel cobalt ore could got the nickel cobalt comprehensive concentrate with nickel grade 26.44%,cobalt grade 154%,nickel recovery rate 88.53%,cobalt recovery rate 75.87%.
    Research on Physical Sensitization Materials of a New Type of Emulsion Explosive
    HE Nan
    2011, 27(08):  23-25. 
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    Emulsion explosive was prepared through whole physical sensitization by using perlite, glass bead and A1 particle ,test and comparison were done on sensitizing effect and emulsion explosive performance, the results showed: all the performance indexs of emulsion explosive through sensitization by A1particle were all better than perlite sensitization and slightly better than glass bead, A1particle had advantages like environmental protection, pollution-free and so on, it was worth to study further.
    Experimental Study on a New Type Cementing Fill Material for Mine
    YIN Yu
    2011, 27(08):  26-28. 
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    Fill mining has becomed the important way of geological hazard control, wasteless mining realization. Therefor, experimental study on cementing material which take blast furnace slag as the main material was carried out. Including physical property determination of filling aggregate and new type cementing fill material matching test. The new type cementing material has the characteristics of low cost, high strength and better bonding capacity than milltailings and so on, could reduce filling cost greatly, has good economic benefit and social benefit.
    Study on Technological Mineralogy Characteristics of a Vanadium Titanium Magnetite in Chaoyang
    LIU Xing-Hua, ZHAO Li-Bing, YUAN Zhi-Tao
    2011, 27(08):  29-31. 
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    Through systemic technology mineralogy study, mineral composition, modes of occurrence of iron and titanium, structure of ore, embedded properties of main useful mineral and monomer dissociation difficult degree of value mineral of vanadium titanium magnetite in Chaoyang were revealed, was the reference basis for the reasonable development utilization of this vanadium titanium magnetite resource.
    Analysis on Underground Rock Burst Prediction of Luohe Iron Mine
    SUN Shi-Ping, ZHANG You-Feng, HE Xiao-Wen, JIANG Wen-Wu
    2011, 27(08):  32-34. 
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    On the basis of research results like geological data, ground stress distribution law, rock mechanics parameter indexes and so on, analysis and forecast were done on rock burst probability of Luohe Iron Mine by adopted various kinds of rock burst criterion separately, controlled the tendency of underground rock burst. The result indicated, probability of rock burst of ash tuff, secondary quartzite, altered trachyandensite were little, but rock burst possibilities of three typical rocks of alkaline feldspathic rock , paste pyroxenite and magnetite were all above average, with the increase of depth, the level of rock burst was greater. The results provided technical support for safe and efficient production of mine.
    Research on the Mine Fire Numerical Simulation under the Condition of Multi-Parameter Coupling
    LIN Long-Yuan, CHEN Hai-Yan, YAN Cui-Ping, JIANG Tao
    2011, 27(08):  35-37+43. 
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    In order to study the mine fire's development law under the impact of multi-parameter, fire dynamics simulator software (FDS) was adopt to inspect the influence from each parameters changing to the ventilation of laneway when fire happened.The result showed the laneway crown temperature rose from 45 ℃ to 200 ℃ when the fire power increased from 180kW to 1800kW; the laneway crown temperature was from about 75～80 ℃ on average under different dip angles of laneway,which indicated that the impact of the dip angles upon the crown temperature was small. As the laneway ventilation speed increased from 0.5m/s to 3m/s, the laneway maximum air stream velocity increased from 4.60m/s to 515m/s, the distribution of upwind laneway velocity was enven and was difficult to produce circumfluence,however that of the downwind laneway velocity was disorderly and the fume layer was destroyed. This study achievement has the important and practice significance for mine fire prevention.
    Fuzzy Comprehensive Evaluation on Explosion Risk of Coal Mine Gas based on Entropy
    YU Shuai-Lei, ZHANG Yong-Heng
    2011, 27(08):  38-40+135. 
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    Coal mine gas explosion is a complex process which is influenced by many factors together. Based on the mechanism and characteristics of coal mine gas explosion accident, the relationship between all influence factors was analyzed by using entropy method. By integrating the subjective and objective factors, confirming the weighing of all influence factors, fuzzy comprehensive coal gas explosion risk evaluation model on the basis of entropy weight was established. The evaluation was done on gas explosion risk of one mine, and the result was consistent with practical situation, had a certain practical using value.