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    16 September 2013, Volume 42 Issue 09
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    Optimization of Mining Methods in High-Altitude Areas Based on AHP-FCE
    GONG Jian, HU Nai-Lian, ZHANG Yan-Kai, WANG Xiao-Dong
    2013, 42(09):  1-5+9. 
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    In order to guarantee the scientific accuracy in selecting the mining method and to avoid the subjective arbitrariness of experience analogy method in high-altitude areas，the mining method selection was changed into the systems engineering decision with a polymetallic ore in Tibet autonomous region as the engineering background. In consideration of five factors of economy，technique，safety，environment and resources，a comprehensive hierarchy structure of evaluation indexes was built by Analytic Hierarchy Process to get a reasonable weight matrix. Then Fuzzy Comprehensive Evaluation method was used to determine membership matrix and calculated for a theoretical optimal method. Finally，the optimal mining method was proposed by the combination of theory with practice. The practical application shows that the AHP-FCE method is highly logical，systemic and practical. It not only can be used as a guideline for mining method selection in high-altitude areas，but also provides a new way for the similar optimization problem.
    Analysis of Slope Stability of Dayanggou Dump at Gongchangling Open Pit Iron Mine
    ZHANG Tao, MA Ning, CHEN Qing-Feng, ZHANG Wei, ZENG Dong
    2013, 42(09):  6-9. 
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    According to the reality of Dayanggou Dump of Gongchangling Open Pit Iron Mine，and on the basis of the geotechnical engineering investigation and the analysis of physical and mechanical properties，the stability of typical sections of dump slopes under the current operating status and the limiting dump height operating status was analyzed with the use of Geo-Slope limit equilibrium theory and FLAC2D numerical analysis method. The results showed that the Dayanggou dump slope is stable under the current operating status. Under the limiting dump height operating status，the dump slope keeps stable when the dumping reaches the limiting height of 436 m. This conclusion is great significant for the actual dumping.
    Numerical Simulation Study of Surrounding Rock Excavated in Joint Rock Mass based on Discrete Element Method
    WANG Hong-Ying, ZHANG Lei, GUO Bin
    2013, 42(09):  10-13+18. 
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    The occurrence and mechanics of joint generally determines the integrity of rock mass，and also influences the stability of surrounding rock significantly.This paper mainly analyzes the stress of surrounding rock and lining considering four factors of release ratio of initial stress，distance of joint，integrity of joint and buried depth of tunnel in construction of tunnel with UDEC code.The results show that:①the stress of lining decrease with the increasing release ratio of stress，however，once it reaches certain value，the upper covering rock mass slides and collapses，then the main bearing position turns from invert to vault; ②the increasing distance of joint enhances the integrity of rock mass，which improves the self-bearing capacity and whole stability of surrounding rock;③the inclination angle of joint influences the main bearing position of lining structure;④the yield elements，together with the internal force of lining structure，significantly increase with the increase of buried depth.
    Simulation Analysis of the Final Sloping Angle Design and Optimization on the Open-pit Mine
    HU Bin, WANG Wei, ZHANG Teng, WANG Xin-Gang, GUO Li-Na
    2013, 42(09):  14-18. 
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    In order to gain the optimal sloping angle of the open-pit mine，combined with the engineering experiences，a slope optimization cycle flow chart based on the numerical simulation is established which makes the optimization design of the slope more clear and direct. After the geotechnical investigation and rock mass tests，three dimensional explicit finite difference program FLAC3D is used to analyze various indexes which response of slope stability of the mine，including the displacement and the plastic zone under different slope angle of the mine，to determine the final sloping angle finally and find out the location of the potential slide surface. Then，the stability checking of design proposal is made and the slope stability factors are gained by the international prevailing software Slide. The case in an open pit proves that the method above is practical and effective for the slope optimization
    The Stability Optimization Analysis of the recovering process underground metal mines in
    欧Yang-Zhi-Hua , LIU Xia-Lin, WANG Ji-Peng, LI Miao
    2013, 42(09):  19-21+25. 
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    Based on the recovering remnant ore engineering practice of Zhengxing Iron Mine in Hubei Daye，the finite element analysis software ANSYS is used to build the mine 3D model.On the basis of the finite element analysis of the stability of surrounding rock，combining with Design Exploration design module of ANSYS Workbench，simulating the influence of rock mass stability of complicated conditions during the process of recovering remnant，and quantified the extent of pillar mining.At the same time，launching the safety monitoring and early warning of dangerous region by means of acoustic emission technique，analysis results can provide scientific basis to acoustic emission monitoring stationing.The simulation results are instructively important for safe production in mines.
    Impact of the Blasting Vibration on the Safety of the Upstream Tailings Dam
    吕Shu-Ran , WANG Ji-Fei-
    2013, 42(09):  22-25. 
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    Through measuring blasting vibration acceleration in the tailings dam foundation from a mining company of Chengde，the variable amplitude processing on blasting vibration acceleration signal is made to load the finite element model based on real tailing pond.The effects of blasting vibration on the stability of tailing dam，tailings dam coefficient of pore water pressure，and the shear are studied systematically by changing the amplitude intensity of blasting vibration.The result shows that:the influence of blasting vibration on the tailings pond has a critical vibration intensity value.When the blasting vibration intensity is less than the critical value，it is beneficial to the safety of tailings dam.When the blasting vibration intensity is beyond the critical value，it is harmful to the safety of tailings dam.Through the calculation by the finite element，and considering the variation of the safety factor stability，the pore water pressure and the maximum shear stress，the conclusion is that the critical acceleration of blasting vibration in tailings dam foundation dam is at 0.266g and the related vibration velocity is at 13.6 cm/s.If keeps more than 3 times safety reserves for the safety consideration，the safety vibration acceleration is 0.089g，and the vibration velocity is 4.5 cm/s.This criterion for the safety blasting vibration velocity has reference significance for the similar tailing ponds.
    Research of the Reasonable Cutting Method and Blasting Parameter in Limestone Drift Excavation
    SUN Long-Hua, YANG Shuang-Suo, LI Da-Chang, SU Xin
    2013, 42(09):  26-29+33. 
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    In view of low efficiency in Tunneling and cutting of the limestone drift of Yangmei minmetals，the cutting blasting effect theory is used to analyze the problems existing in drift excavation. Then，combining with the literature and the actual engineering，the reasonable blasting parameters are determined. Finally，the comparative analysis on the blasting effects performed in homogeneous limestone drift with three cutting patterns of the rhombus cut，the single helix cut and the triangle cut are made. The conclusion is that the single helix cut blasting technique in homogeneous limestone drift excavation in Yangmei Minmetals realized the efficiency of borehole up to above 90% and reduced the hole number and the unit consumption of explosive to be a reasonable level.
    Liquidity Detection of Neotype Whole-tailings Cementing Materials
    WEI Wei, GAO Qian, YANG Zhi-Qiang
    2013, 42(09):  30-33. 
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    A neotype cementing material was developed by using industrial residue，and its consolidation on whole-tailings highly exceed that of the cement.Slump test，consistency test and delamination test were carried out on the condition of different cement-sand ratio and different weight concentration in order to detect the liquidity of the neotype cementing material.The results show that the liquidity of neotype cementing material is as same as that of 32.5# cement under conditions of the same cement-sand ratio and weight concentration.The filling slurry with neotype cementing materials can meet the requirement of pipeline transportation.
    Study on Coagulability and Fluidity of Unclassified Tailings Paste with Gobi Aggregates
    LI Gong-Cheng, WANG Hong-Jiang, WU Ai-Xiang, PENG Nai-Bing, YANG Peng, YANG Xi-Xiang, ZHOU Fa-Lu
    2013, 42(09):  34-36+40. 
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    Taking the coarse aggregate paste with gobi aggregates as the experimental slurry，the orthogonal design method was adopted to design the experimental scheme to study the influencing rules of mass concentration，cement-sand ratio，tailing-aggregate ratio and the addition of pumping agent to the compressive strength and the collapsed slump. Test results are analyzed by the range analysis and the multiple regression analysis method. The results showed that the cement-sand ratio has the greatest influence on compressive strength of the paste and these factors have the similar influence on the collapsed slump. According to the requirement of strength from the mine，the filling ratio of false bottom should be that the concentration ranges from 77 % to 78 %，the tailing/gobi aggregate ratio is from 2.5 to 3.5，the cement-sand ratio is from 0.16 to 0.17，and the addition of pumping aid is from 1.5% to 2.0%; the filling ratio of false roof should be that the concentration is from 77% to 78%，the tailing/gobi aggregate ratio is from3.0 to 4.0，the cement-sand ratio is from 0.09 to 0.11，and the addition of pumping aid is from 1.5% to 2.0%.
    Experimental Research on Influencing Factors for the Flowability of Total Tailings Paste Backfill Slurry
    ZHENG Juan-Rong, 吕杉杉 , ZHAO Zhen-Bo
    2013, 42(09):  37-40. 
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    An experimental study on influencing factors of the flowability of total tailings paste backfill slurry was carried out. The test results showed the solid concentration of slurry，the contention of fine (-20 μm) tailings particle，superplasticizer contention and the type and contention of fly-ash all obviously influenced the flowability of total tailings paste backfill slurry. The influence of fine tailing contention on the flowability of total tailings paste backfill slurry without and with superplasticizer was obviously different. 4% solid concentration of the slurry and 20% fine tailings particle contention could be increased with superplasticizer in the slurry and unchanging flowability of the slurry.
    Application of the Critical Slip Field Method in Slope Stability Analyzation of Open-pit Mine
    SONG Zhi-Fei, XU Xiu-Ming, SUN Shi-Guo
    2013, 42(09):  41-43. 
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    The critical slip field method was applied to analyze the slope stability of 2-2 profile of Northern Slope of Jinchuan Open-pit Mine，and contrasted with some other classical methods.It is proved that the slip line by using the critical slip field method is closer to actual slip surface than by any other method，thus providing practical evidence of its practicability and feasibility in further application of slope.
    Optimization of Panel Mining Sequence for the Middle-section Top Pillar of Xincheng Gold Mine
    GUAN Kai, ZHU Wan-Cheng, ZHANG Hong-Xun, WANG Qing-Yuan, WEI Chen-Hui
    2013, 42(09):  44-49. 
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    College of Resources and Civil Engineering,Northeastern University Focusing on the safe and high-efficient recovery of top pillars at -580 m level of Xincheng Gold Mine，four panel mining sequences were proposed and each panel mining sequence is optimized.Firstly，the structural planes at stope roof and sidewall at -580 m level middle section were characterized with the advanced ShapeMetrix 3D digital photogrammetry measuring system，and the physical and mechanical parameters were calculated according to the Hoek-Brown strength criterion.Then，3D visualization models containing roadways and man-made roof were constructed and adopted to make numerical simulation on the excavation processes.Finally，through analyzing on and comparing with the excavation-induced response of principle stress and deformation around the stope and other key positions，together with the damage around the stope under the different schemes，the optimal mining sequence is determined.The numerical results may provide reference for the safe recovery of top pillars at Xincheng Gold Mine.
    Research on the Slope Stability Analysis and Economic Benefits of Steep End-Slope Mining
    MENG Qing-Wu, SHU Ji-Sen, HAN Liu
    2013, 42(09):  50-52+87. 
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    Two methods of slope stability analysis for steep end-slope mining are proposed by using the related theory of steep end-slope mining，and the research model of the economic benefits by the steep end-slope mining and the calculation model of the secondary stripping costs are set up. Taking a surface coal mine in the north of China for example，the bilateral end-slope angles in the first strip area can be increased from 37° to 44° and 42° respectively. By this method，about 116 921 120 yuan of economic benefits can be obtained and 16 622 870 yuan of the secondary stripping costs between the first and the second strip area can be saved each year. The result showed that it is technically feasible to adopt the steep end-slope mining in large-scale surface coal mine with flat coal seam in China and this mining method can bring large economic benefits.
    Influence of Secondary Mixing Process on Full Tailings Cementation Filling Quality
    ZHOU Jia-Xiang, SHAO Xia
    2013, 42(09):  53-55+59. 
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    The influencing factors of the full tailings cementation filling quality in Daye iron mine is amalyzed in detail, and compares the change of cementation filling's compressive strength in detail after the mixing process changed.A detailed analysis of the improvement of filling quality after secondary mixing process replacing ordinary mixing process is made.This improvement can effectively improve the average compressive strength of filling body，and also solve the problem of the big fluctuation in average compressive strength.
    Research on the Mining Market Environment Evaluation for the Main Iron Ore Countries in the World
    XIE Wei, ZHENG Ming-Gui
    2013, 42(09):  56-59. 
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    The mining market environment is the important external factor affecting the exploration of mineral resources，and the evaluation on it is significant for the development of overseas mineral resources. Firstly，the main factors influencing the mining market environment are identified，and an assessment index system is established to determine the weight of each index by analytical hierarchy process; Then，the model based on constant weight is built by determining the evaluation subject and classifying the evaluation index. Finally，the integrated assessment model based on the variable weight is established，and the evaluation results of both models are compared with each other. The research indicated that with better theoretic and application value，the models being built gained the ranking of the mining market environment for different countries according to its merits. This rank is more consistent with the reality，and can be used as an important reference to select the overseas iron ore resources for China's mining companies.
    Quality Improvement and Impurity Reduction Process Optimization of Dong'anshan Magnetic Coarse Concentrate with Dispersant NM-1
    YANG Guang, WANG Nai-Ling, YIN Wan-Zhong, LU Ji-Wei, LUO Xi-Mei
    2013, 42(09):  60-63. 
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    The original beneficiation process in Donganshan dressing plant that siderite was treated by direct flotation and hematite (magnetite) and quartz were separated by reverse flotation could not adapt to the production increasing of siderite ore. Taking NM-1 as the dispersant of micro-fine siderite，research on technical conditions of reverse flotation for magnetic coarse concentrate was carried out. The results showed that iron concentrate with Fe grade 66.37% and Fe recovery of 75.00% was obtained by the single reverse flotation process of one roughing-two cleanings-one scavenging and middlings back to the flow-sheet in turn,using NM-1 as dispersant. Optimized process was even more concise and improved the economic and technical indicators，obtaining the Fe concentrate grade deceased by 1.47% and Fe recovery increased 5.53%.
    Experiments on Iron Increase and Silicon Reduction by Reverse Flotation for a Magnetic Iron Concentrate in Hebei
    TAO Hong-Biao, CAO Xue-Feng, LU Jian-An, ZHANG Qing-Peng, BAI Ding
    2013, 42(09):  64-66. 
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    Tao Hongbiao，Cao Xuefeng，Lu Jian'an，Zhang Qingpeng，Bai Ding School of Resources Processing and Bioengineering, Central South University Magnetic concentrate from an iron dressing plant in Hebei has good monomer dissociation with fine granularity, but contains high content of silica, which is difficult to remove through low or high intensity magnetic separation. The magnetic iron concentrate on site was treated by reverse flotation for iron increase and impurities reducing. The results showed that with starch+sodium humate (mass ratio of 2∶1) as combining depressant for iron ores, OXP+C-1 (mass ratio of 5∶1) as combining collector for gangues, iron concentrate with Fe grade of 65.17% and Fe recovery of 88.14% was gained by adopting the process of one roughing, one scavenging, two cleanings, middles back to the flowsheet.
    1.School of Mining Engineering，University of Science and Technology Liaoning；2.Anshan Mining Co. of AnSteel Group
    LI Yang, WANG Jiao-Jiao, CHEN Guang-Zhen
    2013, 42(09):  67-69. 
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    Using sodium hexametaphosphate and caustic starch as regulators，and DEK，a new cationic agent，as collector for reverse flotation，the reverse flotation of magnetic separation iron concentrate from an iron ore concentrator in Anshan were studied. The results showed that，compared with the original anionic reagent system of reverse flotation，the cationic reagent system of reverse flotation，which using DEK as the core，was significantly simplified. Flotation could be operated in neutral environment and did not need steam heating to about 30 ℃.Using the determined process and regulation of agent to deal with the ore，iron concentrate with Fe grade of 66.02% and recovery of 90.16% was obtained.
    Effect of Sodium Oleate on the Grinding-aid of Oolitic Hematite from Western Hubei Province
    QIAN Gong-Ming, LU Dong-Ming, MIAO Shuai, HAO Yi-Feng, LU Juan, LIU Feng-Jiao
    2013, 42(09):  70-71+75. 
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    The effect of sodium oleate as grinding aids on the grinding efficiency of oolitic hematite was studied and the mechanism of the grinding aids was analyzed. The results indicated that the sodium oleate is a very effective grinding aid during grinding of oolitic hematite. Under the condition of grinding concentration 50%，the addition of sodium oleate is 0.4%. As the grinding aid，sodium oleate mainly reduces the micro-hardness of hematite，and is beneficial to separate hematite from collophanite since it leads to the hydrophobic reunion action of hematite particles.
    Beneficiation Experiment on a High-silica Low-grade Hematite Ore in Xinjiang
    GAO Ya-Wei, LIU Cheng-Song, LI Jing-She, TANG Hai-Yan
    2013, 42(09):  72-75. 
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    Ore dressing processes consisting of stage grinding-stage high gradient high intensity magnetic separation-reverse flotation were applied for development and utilization of a high-silica low-grade hematte ore in Xinjiang. The results showed that ironc concentrate with Fe grade of 61.10% and Fe recovery of 65.63% was achieved throght the process flowsheet of grinding-high intensity magnetic separation-regrinding of coarse concentrate-clean concentration by high intensity magantic separation-one roughing and one cleaning reverse floatation of the high intensity concentrate-middles back to the flowsheet.
    Beneficiation Experiment on a Refractory Vanadium-titanium Magnetite in Heilongjiang Province
    YUAN Lai-Min
    2013, 42(09):  76-79+107. 
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    Based on the mineralogy characteristic of a refractory vanadium-titanium magnetite in Heilongjiang，the technical conditioning tests for beneficiation of the ore were carried out by the principle of low intensity magnetic separation-high intensity magnetic separation-flotation. The results show that by adopting the process of one stage grinding-one low intensity magnetic separation-regrinding of tailings-one high intensity magnetic separation-one roughing，two scavengings，four cleanings and middles back to the flowsheet in turn，Iron concentrate with Fe，TiO2，V2O5 grade of 55.04%,12.11%，0.62% and Fe，TiO2，V2O5 recovery of 83.01%，63.08%，85.54%，and Titanium concentrate with TiO2，Fe，V2O5 grade of 45.11%，34.90%，0.22% and TiO2，Fe，V2O5 recovery of 27.56%，6.17%，3.56% were obtained separately.
    Beneficiation and Metallurgical Experiments of a Gold Ore from Western Henan Province
    QIAO Jiang-Hui, SONG Xiang-Yu, ZHANG Hui
    2013, 42(09):  80-83. 
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    Based on the mineralogy study of a gold ore from western Henan province，beneficiation tests on the ore was carried out by adopting the process of flotation-cyanide leaching.The results showed that through the process of one roughing，one scavenging and three cleanings-middles back to the flowsheet in turn-direct cyanide leaching for the flotation tailings，gold concentrate with Au grade of 31.20 g/t and Au recovery of 68.50% was achieved.Au recovery from pregnant leaching solution was 22.05% and total gold recovery reached 90.55%.
    Beneficiation Experiment on a Copper Nickel Sulphide Ore in Guangxi
    MU Xiao, WANG Zhang-He, LIU Xu, ZENG Jian-Wei, WEI Chun-Wen, WEI Zong-Wu, LIN Mei-Qun
    2013, 42(09):  84-87. 
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    Aiming at the characteristics of a low-grade copper and nickel sulfide ore in Guangxi, development and utilization of the ore were carried out by the process of Cu-Ni bulk flotation-copper floating and nickel inhibiting. The results showed that with oxalate as activator of Cu-Ni bulk flotation, activated carbon as reagent removal for separation of Copper and Nickel, the lime, sodium sulphite and SY as the combining depressant for separation of copper and nickel, copper concentrate with Cu grade of 15.24% and recovery of 76.65%, and nickel concentrate with Ni grade of 4.90% and recovery of 82.36% were obtained by adopting the process of one roughing and four scavenging for Cu-Ni bulk flotation, one roughing, two cleaning and two scavenging for separation copper and nickel, and middles back to the flowsheet in turn.
    A New Beneficiation Process for a Molybdenum Ore in Shaanxi
    FU Yi-Wen, PENG Hui-Qing, QIN Lei, YAO Qin-Qin
    2013, 42(09):  88-90+112. 
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    The main molybdenum mineral in a low-grade molybdenum ore in Shaanxi is molybdenite，and molybdenite was disseminated in gangues in micro-fine particle.Molybdenum concentrate with Mo grade of about 50% and Mo recovery of about 80% was obtained by adopting the process of one-stage grinding-one roughing，one cleaning，two scavenging，and two-stage grinding-nine cleanings and two scavenging-middles back to the flow-sheet in turn,on site. In order to further improve the separation indexes，the technical conditions tests on beneficiation of this ore were studied.The results showed molybdenum concentrate with Mo grade of 54.23% and Mo recovery of 89.70% was gained by the process of one-stage grinding-one roughing，one cleaning，two scavenging，and two-stage grinding-five cleanings，two scavenging of the concentrate，three-stage grinding-tree cleaning-middles back to the flow-sheet in turn.Thus，the final concentrate index has been significantly improved.
    Experimental Research on Low-temperature Calcination of Coal-series Kaolin to Reduce the COD and Improve the Order Degree
    TIAN Zhao, ZHANG Ling-Yan, GUAN Jun-Fang, YANG Ze-Qing, LI Xiao-Song, LIU Xin, CAO Gang
    2013, 42(09):  91-93+116. 
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    A low-temperature calcination test of coal-series Kaolin with high COD from Xingshan of Hubei Province was studied. The results showed that the COD value was reduced from 1.0056×10-2 to 2.523×10-3 when the kaolin was roasted for 0.5 h at 425 ℃，which met the requirement of glass fiber for kaolin on COD. Contrasting and analyzing the XRD and IR spectra of product before and after calcinations，it is showed that low-temperature calcination not only could remove most of organic material from kaolin to reduce the COD value，but also can effectively save the vast constitution water in kaolin，which could ensure the activity of glass fiber material and the mixing function of micro area，and moreover improve the order degree of product.
    Vanadium Pre-concentration Technology from Vanadium-bearing Stone Coal Mine
    BIAN Ying, ZHANG Yi-Min, BAO Shen-Xu, ZHAO Yun-Liang, LIU Xiang
    2013, 42(09):  94-99. 
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    In China，problems of low vanadium grade and large throughput，high acid consumption and low vanadium recovery existing in vanadium extraction technology are the key factors in restricting its development.So the study of vanadium pre-concentration technology from vanadium-bearing stone coal has important significance.According to the technologies and practices introduced in some literatures，the process of single flotation，single gravity concentration，gravity-flotation separation and classification-scrubbing separation for vanadium-bearing stone coal are effective process to solve the problems which restrict the industrial development of vanadium extraction from stone coal based on the study and analysis of mineral compositions and vanadium occurrence in our country .Finally，it is stressed that the process for vanadium pre-concentration from stone coal should be simple under the principle of low production costs，unified with the environmental benefits in economic benefits.Separation of contaminations which have strong effect on the subsequent extraction technology，development of new flotation reagents and application of new equipment for treating fine vanadium-bearing minerals also should be taken seriously in the stage of vanadium pre-concentration.
    Research Status on Ferrous and Aluminum Separation of High-Fe Bauxite in China
    YUAN Zhi-Tao, ZHANG Song, LI Li-Xia, YU Fu-Jia
    2013, 42(09):  100-103. 
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    The paper briefly introduces the characteristics of high-Fe bauxite resources in China，and summarizes the research status on the development and utilization of high-Fe bauxite resources.The conventional separation processes such as magnetic separation，flotation，integration of magnetic separation and flotation are the efficiency and low-consumption process for easily-separated high-Fe bauxite.Bayer method and red mud magnetizing roasting method were used to treat the high-Fe bauxite that need to be finely ground，by which the recovery of ferrous and aluminum is better gained，but Fe concentrate grade needs to be improved further.Ideal alumina and Fe products can be obtained by high temperature roasting process from high-Fe bauxite，but the production cost will be much higher.
    Research Progress of Effect on Grinding Media System on Grinding Process
    CHENG Xu, WU Hao-Jie, WANG Ze-Hong
    2013, 42(09):  104-107. 
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    Grinding media system directly affects the technical and economic indicators of the concentrator.The paper introduces the research progress on the grinding media system at home and broad from four aspects of grinding media's shape，size，ratio，filling rate etc..The studies indicated that different shapes of grinding media has different grinding characteristics，and different sizes of media is suitable for dealing with different particle size of the ore.A reasonable ratio can improve grinding efficiency，and the filling rate of the media can significantly impact the motion state of the media and the useful power of the mill.In view of the shortcomings in the current research achievements，the future research direction in the grinding media system was put forward.
    Element Geochemical Significance of Zhuxi Vanadium Deposit
    YANG 恩Lin, 吕Xin-Biao , CHEN Huan, WU Bo
    2013, 42(09):  108-112. 
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    Taking Zhuxi vanadium deposit in the Qiandong area，Guizhou province as an example，the concentration of major and trace element of rocks and sandstone are analyzed and surveyed，and the contents and ratios of the characteristic elements are discussed.The results showed that the maximum and minimum δ Ce value of the sample correspond to the lowest and highest levels of vanadium respectively; seawater environment with aerobic-anoxic continuous changing results in forming ore bodies only at the bottom of Jiumenchong Group with the same lithologic section.V in ores shows in multivalent form mainly due to the ladder faults at the narrow ocean bottom of Nanhua.Hypoxic seawater with V-riched organic matter results in ore-forming of vanadium.Passive continental margin，repeatedly eustatic cycles and redox interface serve as ancient geographical environments for vanadium deposits.
    Application of Multivariate Statistical Methods in the Geogas Anomalies Inferred Interpretation
    LIU Guo-An, ZHOU Si-Chun, ZHAO Hui, SUN Sen, LIU Jun
    2013, 42(09):  113-116. 
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    With Huangshaping lead-zinc mine in Hunan province and Dongshan lead-zinc integrated exploration area in Shidian of Yuanna province as the object，experimental research of geogas measurement to detect concealed multi-metal mine is carried out.The factor analysis，cluster analysis and discriminant analysis methods are adopted to infer the geogas anomalies，obtaining the connection relationship among the ores anomalies，ore-bodies and underlying igneous rocks.The difference of ore anomalies and non-ore anomalies is revealed.It is concluded that the integrated use of the multivariate statistical method can more accurately infer the unknown abnormal geogas.
    Establishment of Metadata Standards for Mine Geographic Information
    WANG Li
    2013, 42(09):  117-120. 
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    Based on the analysis of the meaning of metadata，and the metadata standards for spatial geographic information，this paper summarized the function of metadata for mine geographic information.The process in establishing metadata standards for mine geographic information was analyzed and the frame of the standard was elaborated.Finally，the basic architecture and functionality of metadata system for mine geographic information was proposed.
    The Geochemistry and Geological Significance of Nanshan W-Sn-Polymetallic Deposit
    FAN Fei-Peng, XIAO Hui-Liang, CHEN Le-Zhu, BAO Xiao-Ming, CAI Yi-Tao, ZHOU Yan, WU Ling, WU Han-Yu
    2013, 42(09):  121-125. 
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    The analysis on the geochemical composition of various types of ore-bearing skarn showed that the fluid containing Ti，Fe，Mn，Mg and Ca are transferring and exchanging among biotite granites and skarn rocks in Nanshan mining area，forming skarn minerals.The ore-bearing skarn and marble have similar REE patterns in right-inclined type，and enrich in LREE with Eu in middle negative anomaly and no Ce anomaly.The skarn enriches trace elements of Rb，Th and Sm and is depleted of K，Ba，P and Ti，and the marble is lack for Rb and Ba.Obviously，it's typical hydrothermal-metasomatic skarn formed in high temperature，inheriting lithologic features.The formation time of ore-bearing skarn and marbles was 158.1±1.8 Ma.
    Drilling Technology and Equipment for Pre-grouting Reinforcement Directional Borehole in Coal Floor
    LI Quan-Xin, SHI Zhi-Jun, FANG Jun
    2013, 42(09):  126-131. 
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    Pre-grouting reinforcement of the current coal floor with directional borehole is an important innovation of coal floor water prevention，combined directional drilling with floor pre-grouting reinforcement. This paper systematically studied on pre-grouting reinforcement principle，drilling equipment，drilling designing，and drilling technology，and a set of directional drilling technology and equipment for coal floor pre-grouting reinforcement is formed. The experiments in Zhaogu mine No.11151 work face show that the drilling technology and equipment above is reliable and advanced，and the effect of floor grouting reinforcement is good. The research enriches and improves the coal floor water prevention methods，achieving a major breakthrough in advance prevention of disasters resulted from ground water. It is significant for the safe and efficient exploitation of coal mine.
    Elevator's Control System of Mine based on Profibus-DP Field Bus System
    CHENG Meng-Ling, PANG Ke-Wang, SI Yu-Hua
    2013, 42(09):  132-134+166. 
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    The research of the mine hoist based on Profibus-DP field bus control system was introduced，briefly described the Profibus-DP field bus network topological structure of the hoisting machine and its implementation to the elevator control system，and gave the design of the software design of upper machine and lower machine. By the way，the PLC is used to realize DP newsletter and make the stability，security and production efficiency of the elevator control system improved. The system has a wide range of applications.
    Determination of the External Load Change Characteristic of Loader Bucket Cylinder
    XU Li-Chao
    2013, 42(09):  135-137. 
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    Aiming at present deficiency in getting the external load of loader oil cylinder，the determination method of the external load change characteristic of loader bucket cylinder is investigated.Based on establishing the external load mathematic model of bucket cylinder，the hydraulic pressure and piston displacement of bucket cylinder were actually tested and processed when loader shovels loose soil，and the change courses of the hydraulic pressure of rodless chamber，rod chamber and piston displacement of single typical operating cycle were obtained.In the paper，matlab was applied to fit the hydraulic pressure and piston displacement at different operating segments of the obtained single typical operating cycle，and by the programming process，the external load waveforms of different operating segments of bucket cylinder were obtained.After the waveform of each work segment was merged with nsoft software，the external load change characteristic curve of bucket cylinder when loader shovels loose soil was acquired.The analysis result showed that the determined external load change characteristic of bucket cylinder was consistent with the actual working condition.
    Design of the Vision Monitoring and Fault Intelligent Recognition System for Security of Mineshaft
    XING Yuan-Xiu
    2013, 42(09):  138-141. 
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    An vision monitoring and fault intelligent recognition system of mineshaft instead of the traditional manual check.The mineshaft scene is captured and stored at the same time by front-end video capture device，and is displayed on ground display screen by the wireless transmission device.The capture process of front-end device is controlled by ground equipment，and the faults are identified by using fault identification algorithms.This system can automatically monitor and upgrade the mineshaft facilities and identify faults accurately，and it can improve the efficiency of mineshaft monitor greatly.
    Research on Land Destruction Prediction Methods of Land Reclamation in Coal Mining Area
    ZHANG He-Bing, WANG Shi-Dong, LI Chun-Yi
    2013, 42(09):  142-147. 
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    The land destruction prediction has great significance for land reclamation in coal mining area.It is critical to select the prediction methods for ensuring the accuracy and objectivity of land reclamation feasibility analysis，thus affecting the decision-making in land reclamation.Taking Fukangyuan Coal Mine in Shanxi Province and Guojiadi Coal Mine in Guizhou Province，for example，both the probability integration method and the maximum height of water flowing fractured zone for land destruction prediction are investigated and their applicability and advantages and disadvantages are anal yzed.The results show that the probability integration method owns a complete system，and is suitable for the sub-mountainous areas such as Yunnan and Guizhou in the south of China.The study provides a better scientific basis and decision-making reference for improving the land destruction prediction in coal mine area of China.
    Design and Application of Microseismic System in Xinli Mining Area of Sanshandao Gold Mine
    DU Fu-Rui, XIE Yu-Ling, HU Nai-Lian, LI Guo-Qing
    2013, 42(09):  148-151. 
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    According to the actual production situation of Xinli mining area in Sanshandao Gold Mine，a high sensitivity seismoscopes sensor is laid out，and a microseismic monitoring system platform is built.The microseismic monitoring technique is adopted for ground pressure monitoring of deep deposit; the onset-time picking waveform is analyzed and made the positioning calculation by host computer.Since established，the system runs well，which improves the underground production safety and effectively prevent from underground rock burst water inrush accident with good economic and social benefits achieved.
    Information Extraction of Coal Mining Subsidence Farmland Submerged in Water Taking Jining City of Shandong Province as a Case
    YANG Guang-Hua, HU Zhen-Qi, YANG Yao-Qi
    2013, 42(09):  152-157. 
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    It is a typical and representative in the country that coal mining has been causing farmland subsided deeply and submerged in water seriously in Jining City.Using the combined methods of high-resolution remote sensing (RS) to obtain information and geographical information system (GIS) to analyze spatially，under the support of land use map，mine distribution map，administrative zoning map，coal mining subsidence land survey and statistic data，the information of coal mining subsidence farmland submerged in water in Jining City since coal mining to the year of 2009 were extracted with the man-computer interactive interpreting method.The results showed that: the perennial water farmland area of cola mining subsidence land was 4 780.49 hm2，accounted for 0.78% of the total area of cultivated land in Jining City，the governance and non-governance subsided farmland submerged in water accounted for 57.84% and 42.16% of the perennial water farmland area，respectively.The subsidence farmland submerged in water mainly distributed in the “Golden Triangle” junction of Qufu City，Yanzhou City and Zoucheng City，the southern Rencheng Distinct and the central region of Weishan County; And its distribution was irregular，a mine with a subsided farmland submerged in water or a mine with two or more subsided farmlands submerged in water.The findings provided a scientific basis for the local government to strengthen the real-time monitoring of the subsided farmlands submerged in water and formulated scientifically the reclamation scheme of the subsidence farmland submerged in water.
    Magnesium Leaching Behavior from a Copper Tailing with Hydrochloric Acid
    FENG Ya-Li, YANG Zhi-Chao, LI Hao-Ran, TENG Qing, WANG Wei-Da, ZHOU Yu-Zhao
    2013, 42(09):  158-162. 
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    In order to efficiently develop and utilization of magnesium from high-magnesium copper tailings，technical conditions for the hydrochloric acid leaching process were studied，and the leaching kinetics model was established.The results showed that under conditions of hydrochloric acid 1 mol/L，reaction temperature at 353 K，liquid to solid ratio of 3〖DK（〗∶〖DK）〗1，reaction time 4 h，stirring speed of 300 r/min，the magnesium leaching rate reached 75.55%; Avrami model can better describe the leaching process.XRD，SEM analysis of leaching residue under different conditions showed that:when the magnesium leaching rate is 75%，the serpentine's structure has been completely destroyed，thus diffraction peaks of serpentine in leaching residue disappeared; High temperature and high pressure only makes the crystal structure of some calcium-magnesium garnets unstable and reaction with hydrochloric acid,which is the reason for lowering the leaching rate of magnesium acid.
    Preparation and Utilization of Ceramsite Made of Low Silica Iron Tailings
    WANG De-Min, LEI Guo-Yuan, SONG Jun-Ping, WANG Tao, LIU Bo-Hua, LUO Wen-Bin, CHENG Yi-Jin, LIU Shu
    2013, 42(09):  163-166. 
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    Taking a low silicon iron tailings as the main raw material，the paper studies the dosage of iron tailings ceramsite，and investigates the performance of tailings ceramsite in applications as lightweight concrete aggregate.The results showed that: the suitable formula for iron tailings ceramsite is the mass ratio of iron tailings，industrial powdery wastes，and KD is 75∶17∶8，finished ceramsite dosage of 920 kg/m3，cement dosage of 220 kg/m3，water-cement ratio of 0.37 (excluding water for pre-wetting ceramsite).Under the formula above，the iron tailings ceramsite concrete owns the density of 1 200, the compressive strength at LC5.0，which meet the requirement for the Insulation structure of lightweight aggregate concrete in JGJ51-2002 standard.The product owns a good insulation performance.