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Table of Content

    15 March 2016, Volume 45 Issue 03
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    Research Status and Development of the Lead-zinc Sulfide Ore Flotation Separation
    QIU Ting-Sheng, HE Yuan-Qing, YU Wen, QIU Xian-Hui
    2016, 45(03):  1-9. 
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    The major research advances of lead-zinc sulfide flotation separation technology are summarized.The characteristics，application scope，advantages and disadvantages of various lead-zinc sulfide flotation technologies are analyzed.The theoretical study progress of lead-zinc sulfide flotation separation from flotation electrochemistry，simulation of molecular mechanics and quantum chemistry are summarized.Moreover，major advances on collectors of lead-zinc sulfide ore，organic and inorganic depressant in the lead-zinc sulfide flotation separation，and zinc sulfide ore activator are also reviewed.On this basis，the research emphasis and research direction of technique of lead-zinc sulfide ore separation is prospected.
    Optimization of Stope Structure Parameters based on Strength Match between Backfill and Rock Mass
    YANG Lei, QIU Jing-Ping, XING Jun, SUN Xiao-Gang
    2016, 45(03):  10-14. 
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    For mines that adopt stage open stoping with subsequent filling，reasonable selection of cement-tailing ratio and stope structure parameters plays a key role in realizing safe mining and improving production efficiency.According to the principle that peak deformation energy of backfill should be corresponded to releasing energy from excavated rock mass，the optimum backfill ratio of Zhongguan Iron Mine was determined to be 1∶6.Under this ratio，and based on the mine's mining condition，three-level and three-factor orthogonal experiment was designed to research how the room length，room width and top pillar height affecting stope stability.FLAC3D software was used to simulate the 9 different structure parameters，and the changes of stress and deformation of top pillar and backfill pillar after backfill were analyzed.The influence sequence of three factors in affecting stope stability was studied，and then the structure parameters were optimized.The calculation results showed that room length and width were important influence factors of stope stability，the optimal room length，room width，and top pillar height were determined as 50 m，18 m，8 m respectively.The mine could ensure stope stability and improve its production capacity effectively under these structure parameters.
    Determination of Mechanics Parameters of Rock Mass in Sijiaying Iron Mine East Slope and Its Stability Analysis
    DENG Wen-Xue, YANG Tian-Hong, 南Shi-Qing , SONG Bin-Bin
    2016, 45(03):  15-19. 
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    To fully understand the geological situation of open pit slope and obtain reliable rock mass mechanical parameters，the slope stability is analyzed.Combining with the geological information of east slope of Sijiaying Iron Mine，the technical means are adopted to enrich the geological information，such as field survey，geological drilling，borehole TV and other technical methods，and the joints and the rock mechanics information are obtained separately by 3GSM and the point load testing.Rock mass rating BQ classification and Generalized Hoek-Brown Strength Criterion are adopted to acquire the basic parameters for computation of slope stability.With the typical sections as a case，the slope safety factors are calculated out.The result show that the original designed final pit slope wall of the N9-N15 area of the east slope cannot reach the requirements of safety factors.The mine should pay attention to drainage and take necessary measures to ensure the stability of the east slope.
    Optimization and Numerical Analysis of Roadway Support Parameters
    WU Duo-Hua, QIAO Wei-Guo, SONG Wei-Jie, LI Wei
    2016, 45(03):  20-24. 
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    The optimization of roadway support parameters not only considers the stability of the surrounding rock，but also the economic costs.There is no clear relationship between the supporting parameters and the stability of surrounding rock and the economic cost.Therefore，it is difficult to determine specific support parameters when ensuring the stability of the surrounding rock and lowering costs.The vertical displacement and horizontal displacement of the roadway surrounding rock are obtained by using FLAC3D numerical simulation software in the orthogonal experiment.The primary and secondary influencing order of the supporting parameters and the optimal level combination were obtained respectively by the range analysis and the comprehensive weighted scoring method.The results show that the primary and secondary order of the supporting parameters influencing the surrounding rock and costs are the thickness of the spray concrete(factor D)，the diameter of the bolt(factor C)，the length of the bolt(factor B)，and the spacing of the bolt(factor A)，and A4B1C2D3 is the best one.The optimal support parameters that were obtained by ground pressure monitoring at wind tunnel can effectively ensure the stability of surrounding rock，and can save 1 875 yuan for each 5 m gateway.These provide the important reference basis for roadway support.
    Optimization of Structure Parameters and Backfill Ratio of the Stope Based on FLAC3D
    LIU Zhi-Yi, GAN De-Qing, XUE Zhen-Lin, ZHAO Hai-Xin, HE Shui-Qing
    2016, 45(03):  25-29. 
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    In order to ensure efficient production capacity and mining safety of the stope，3D-FEM was conducted to analyze the stability of the stope with different structure parameters and filling ratio based on the analysis of the stope-stability of the key factors and failure mechanisms，and the safe and reasonable stope parameters were selected.Stress，stress distribution area and displacement of stope roof of different structure parameters and fill ratio were calculated and analyzed to judge the stability of the stope at different conditions by adopting the FLAC3D.Result showed that，stability of stope at both sides was obviously affected by the backfill ratio.Stability of the stope was changed less when the backfill ratio varies from 1∶6 to 1∶8.The change rate of the stress and displacement of stope roof was a growing trend，and the stability of the stope was lowered when the backfill ratio was less than 1∶8 and the width of the stope was more than 18metres.So the suggested backfill ratio of the first-step stope was 1∶8，and the width of the second-step stope was 18meters based on the synthesized consideration of the safety，high efficiency and costs.
    Stability Analysis of Underground Mining Area after Tailings Backfilling into Deep Sunken Open Pit
    LIU Bin, HOU Da-De, SUN Guo-Quan
    2016, 45(03):  30-34. 
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    After closing the deep sunken open pit of Lunan Mining Company，the technique of tailings backfilling into open pit is proposed to face with the insufficient storage capacity of the tailings pond.ABAQUS definite element numerical software is used to simulate the end of the open pit mining，dry tailing dumping at bottom，and the first phase mining of transiting from open pit to underground.The changing trend of open pit slope displacement，as well as the stress and strain distribution of mining area during transition from open-pit to underground is analyzed.It is concluded that the stress and strain of underground mining area has no obvious increase after the tailings backfilling into the bottom of open pit.Meanwhile，plastic zone of surrounding rock is not well run through.The horizontal and vertical displacements of the open-pit slope are under control.In view of water accumulation at pit during transition from open pit to underground mining，the water seepage and prevention measures are put forward，which have a better engineering reference value.
    Monitoring and Stability Analysis of South Slope of Washan Open-pit Mine，Ma-steel
    WANG Hong-Wei, WANG Pan, WANG Yong-Qiang, CHEN Zhen-Ming
    2016, 45(03):  35-39. 
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    The slope instability of Washan Stope of Nanshan Iron Mine，Ma-steel，is increasingly prominent with the increase of mining depth.In view of this situation，the changing trend and scope of deep rock displacement and surrounding rock stress was found out through monitoring of surrounding rock stress and deep rock displacement.At the same time，the influencing level of blasting vibration on slope stability was obtained，and the stability of the slope was estimated.The variation of the stress and displacement in the process of mining was achieved based on FLAC3D numerical analysis software in mining simulation.Through contrasting with the evaluation results of the stability before slope monitoring，its reliability on slope stability was further verified.The conclusion is that if Washan stope is planned to continue exploiting downwards，it is necessary to strengthen monitoring or reinforce slope before excavating.
    Mixing Proportion of Paste-like Filling Material based on Back-propagation Neural Network
    GU Qing-Heng
    2016, 45(03):  40-44. 
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    In order to explore the effect of material components on material properties and the optimal ratio of paste-like filling material，the BP network model was established based on the 16 groups results of ratio test.The structure of the model is the components and 5-10-3 type of layered degree，slump and long-term strength.By means of entering the refined ratio parameters into prediction model，the optimal ratio were obtained.The results showed that，the maximum relative error of the network model is 6.08%; The amount of cementing material and aggregate determine the long-term strength of materials together.High proportion of coal gangue is beneficial for forming strong structure filling body with the accurate ratio of other components.When the proportion of fly ash is 3 to 4 times that of cement and the proportion of sandstorm is almost equal to coal gangue，the slurry has the best overall performance.The gob-side entry retaining was backfilled according to the optimal material ratio in experimental mine，resulting that the convergence of surrounding rock was light and stable.
    Effect of Continuous Extraction on Stope Stability
    GENG Yang, GUO Jin-Ping
    2016, 45(03):  44-47. 
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    In view of the continuous extraction by the overall mining，the stope stability is analyzed.Taking a copper mine in Yunnan for example，the stress，displacement and plastic zone are analyzed by the numerical simulation method.The results showed that：with the mining advanced，maximum and minimum principal stress did not appear at depth，but concentrated on the top and bottom pillars.The minimum value of minimum principal stress in the stope increased from 2.53 MPa to 5.71 MPa with a 125.7% increase，and the minimum value of maximum principal stress increased from 6.88 MPa to 20.11 MPa，with a 192.3% increase.These may lead to failure on stope.The displacement of each point all showed a growing trend.The displacement of three top and bottom pillars increased suddenly，and the maximum subsidence on the central pillar reached 47.87 mm.The top and bottom pillar showed as shear failure，and the plastic zone of surrounding rock was extended，showing as shear，tensile and shear-tensile failure.In order to ensure the stope safety，the size of top and bottom pillar should be enlarged properly，or stope size should be reduced.
    Effects of Blasting Vibration on the Slope Stability
    ZHANG Tian-Wen-1, CAI Qing-Xiang, JI Xian-Cheng, HAN Liu, SHU Ji-Sen
    2016, 45(03):  48-52. 
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    In order to study the influence law of blasting vibration on slope stability，and to reveal the key technical parameters of blasting，the plane sliding stability coefficient calculation formula was established with the consideration of vibration stress.Based on the numerical simulation analysis method，the stability coefficient variation law of the west slope in Buzhaoba surface mine when influenced by blasting vibration was analyzed，the results showed that the slope stability coefficient has a logarithmic growth with the distance from the explosive center increase.When the distance is longer than 300 m，the influence of blasting vibration on the west slope stability can be ignored.The synergistic effect of slope stability coefficient and vibration velocity is higher，the peak appeared at the same time and the amplitude satisfied the proportional relationship.
    Transportation Risk Assessment of Open-pit Mine based on PSO-BP Neural Network
    JIANG Li-Chun, ZHANG Cai-Jie
    2016, 45(03):  53-57. 
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    In order to assess open-pit mine transportation risk，a new assessment method based on the model of PSO-BP neural net was proposed.Taking the 15 transportation routes of an open-pit mine for example，seventeen major factors were selected as the second-level indexes of risk index system to make quantitative processing.The BP neural net model was built，and its weights and the threshold values were optimized with PSO algorithm.Depended on the risk scores of fuzzy comprehensive evaluation，a comparison of training results and test results between PSO-BP model and BP model was made respectively.Results show that the assessment results of PSO-BP model is greatly consistent with the actual situation and has higher assessment accuracy than that of BP model.The proposed PSO-BP evaluation model.
    Study on the Covered Resources Recycling Scheme of Underground Mine in Planning Area of Residents Relocation Village
    LI Jia-Bin, CAI Qing-Xiang, LIU Fu-Ming, YIN Wen-Ying, YANG Fei, REN Zhi-Hong
    2016, 45(03):  58-61. 
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    Aiming at the placement problem at land surface subsidence of Nalinmiao Mine II，the residents relocation village planning area is considered to set up within the realm of mineral rights.In the feasibility study，two covered resources recycling schemes are presented，consisting of the underground mining-filling method and the blasting caving-surface mining-backfilling reclamation method.Various methods and measures are taken to study these two schemes，including combination of mining operations and mathematical analysis，combination of theoretical analysis and examples，and the establishment of economic models and others.By comparing the economic benefits and social benefits of the two schemes，the blasting caving-surface mining-backfilling reclamation method is adopted.Study shows that the scheme proposed can successfully recover the coal resources of 1.593 million tons in the planning area，and create a direct economic benefit of 150.904 million yuan.Through the land reclamation，the original barren landscape will be improved to be an ecological environment for habitat with a harmonious development of agriculture，forestry，animal husbandry and fishery，realizing a win-win situation of the economic and social benefits.
    Study on Safety Thickness of Goaf Roof Under the Vehicle Load in Open-pit Iron Mine
    DENG Peng-Hong, WANG Hai-Long
    2016, 45(03):  62-66. 
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    The goaf is a great risk to work safely in open-pit mine，and roof is an important factor which affects the stability of goaf.The safety thickness of the proved goafs in Gongchangling open-pit mine was analyzed.The mechanical model of goaf roof under vehicle load was established，by which the vibrating equation of roof was deduced and the calculation formula of safety thickness were gained.Combined with actual situation in Gongchangling open-pit mine，the roof dynamic responses of vehicle speed，vehicle weight，thickness and span to the goaf roof beam were considered.And the minimum safe thickness of the roof with different tensile strength，span and different vehicle weight was calculated out.Based on this，the changing rule of safe thickness is analyzed.The results show that the dynamical bending moment has a linear relationship with the vehicle speed，vehicle weight and the roof span，and its calculated values decrease with the increase of roof thickness.The smaller the roof thickness is，the greater the dynamical bending moment decreasing is；The minimum safe thickness of the roof decreases with the increase of its tensile strength，while increases with the increase of span and vehicle weight.
    Relationship between Froth Entrainment Entrained by Fine Gangues and Aeration Rate
    LI Hong-Qiang, SONG Shao-Xian, ZENG Pei, FENG Qi-Ming
    2016, 45(03):  67-72. 
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    In order to reveal and reasonably utilize the internal relationship between aeration rate and froth entrainment of gangue fines in flotation，a self-made froth overflow rig was adopted to simulate the influencing rule of aeration rate to the properties of froth and entrainment of gangue.Results indicated that：in the two-phase foam，the increase of aeration rate effectively lower the coalescence rate and sauter diameter of bubbles，greatly reduce the foam drainage，and increase the foam fluid rate and apparent fluid rate.Thus，the rate of water recovery can be increased remarkably.In three-phase froth，recovery of gaugues in froth layer is significantly increased when the aeration rate was increased.Thus，controlling the aeration rate is beneficial for reducing the froth entrainment of gangue finess in flotation process under the premise of reasonable concentrate recovery.
    Approaches for Magnesium-containing Gangue Enter into Copper-nickel Concentrate from Jinchuan No.2 Mine Area
    HUANG Jun-Wei, MA Chi, ZHANG Cheng-Qiang, GUO Zhen-Xu
    2016, 45(03):  73-76. 
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    In order to find out the reason for high content of magnesium in copper-nickel concentrate from Jinchuan No.2 mine area，the process mineralogy of copper-nickel concentrate from the on-site process had been researched.The result showed that：the magnesium-containing minerals in the mixed concentrate was mainly serpentine，secondly pyroxene，olivine，chlorite，talc and so on；The particle size of the main copper and nickel minerals in mixed concentrate was fine，but the liberation degree was low，only about 60%，objectively.Strengthening the recovery of copper and nickel minerals created the conditions for easy-floating magnesium-containing gangue minerals and it's intergrowth with copper and nickel minerals into the mixed concentrate；The magnesium-containing gangue minerals in mixed concentrate mostly exist in monomeric form，and there was a certain amount of intergrowth with magnetite，which was the main reason for the mixed concentrate with high magnesium content；The floating order of main magnesium-containing gangue minerals from high to low was：talc> magnesite>pyroxene>serpentine>chlorite>olivine.Therefore，it was important to improve the liberation degree of copper and nickel minerals for reducing the MgO content in copper-nickel mixed concentrate，but it's the key to be targeted to inhibit the magnesium-containing gangue minerals monomer and its intergrowth with magnetite.
    Action Mechanism of a New Inhibitor CMSD for Chalcopyrite and Molybdenite Separation Flotation
    LI Yue-Lin, HAN Cong, DI Qing-Xiang, WEI De-Zhou
    2016, 45(03):  77-81. 
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    CMSD is a new inhibitor for chalcopyrite and molybdenite separation flotation，which is made from sodium sulfide and sodium hydrosulfide as the main raw material.The infrared spectroscopy detection method and the first-principle calculation method based on density functional theory (DFT) were used for studying the action mechanism of CMSD on chalcopyrite and molybdenite.The results showed that chemical adsorption occurred on chalcopyrite (112) and (101) surface of CMSD，and didn't occur on molybdenite (001) surface.The adsorption of CMSD on chalcopyrite (112) and (101) surface is accomplished through HS- concurrently interacting with Fe atom and Cu atom in two crystal surface.The inhibition of CMSD on chalcopyrite is accomplished through HS- adsorbs on chalcopyrite surface，to reduce the surface free energy of chalcopyrite，affect the adsorption of mixing hydrocarbon oil on chalcopyrite，thus reducing the floatability of chalcopyrite.
    Potential Controlled Preferential Flotation Test on Copper-lead-zinc Sulfide Ore from Liaoning
    LIU Bao, HAO Liang-Ying, LI Qiang, DAI Jun-Peng
    2016, 45(03):  82-85. 
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    The valuable minerals of copper-lead-zinc poly-metallic sulfide ore have complex dissemination with uneven grain size.Beneficiation experiment on copper，lead，zinc by using one grinding and potential controlled preferential flotation was conducted.Results indicated that using SN-9#+ aniline aerofloat as collector，Na2SiO3+ZnSO4+CMC as inhibitor at potential of -35 mV，pH=9.1 for copper preferential flotation，then using SN-9#+ aniline aerofloat as collector at potential of -225.6 mV，pH=11.4 for lead flotation，finally using copper sulfate as activating agent，ethyl xanthate as collector in zinc flotation，copper concentrate with copper grade of 23.68% and recovery of 85.61%，lead concentrate with lead grade of 51.26% and recovery of 70.68%，and zinc concentrate with zinc grade of 52.13% and recovery of 82.13% was obtained respectively.
    Recovering Micro-granular Lead and Zinc from Veinlet Belt Fire Area Ore in Dachang
    HU Ming-Zhen, CHEN Jin-Quan, BU Xian-Zhong, ZENG Ji-Shu
    2016, 45(03):  86-90. 
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    Lead-zinc ore in tin poly-metallic ore of Dachang veinlet belt fire area was seriously oxide and complex，easy to become mud，and very difficult to recovering fine particle.For the realization of lead and zinc minerals recycling efficiently，low cost and light pollution，preferential flotation principle flow sequence was used.With ZnSO4 and Na2SO3 as inhibitor flocculation roughing-dispersion concentrating process was used for lead recycling.In the closed circuit test，the lead antimony concentrate grade was 24.58% and 20.91% respectively，the recovery rate was 52.05% and 59.27% respectively.The zinc grade in zinc concentrate was 44.24%，the recovery rate was 83.39%，and the sulfur grade was 31.28%，the recovery rate was 49.66%.The study meets the requirement of recovery of lead，antimony，zinc and sulfur.The total loss of tin is 8.89%，which contribute a lot to the next recovery.
    Study on Improving the Grade of Scheelite Rough Concentrate of a Tungsten and Molybdenum Ore in Henan
    KANG Jian-Hua, SUN Wei, CHEN Chen, GUO Ming-Jie
    2016, 45(03):  91-94. 
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    There is high content of calcic gangue mineral in a low grade tungsten and molybdenum ore in Luanchuan Henan，the efficiency of scheelite roughing from the tailings of molybdenum separation at room temperature is very low，which greatly increases the reagent dosage of heating selection and increases the difficulty in improving the grade of WO3 in concentrate.Experiments on the inhibition effect of sodium silicate，acidified sodium silicate and ATM respectively，and the synergistic effect of the acidified sodium silicate with ATM are carried out.The results show that the order of inhibition effect is ATM > acidified sodium silicate > odium silicate，when the three kinds of inhibitors are used alone；ATM and acidified sodium silicate used at the same time can play a synergistic effect.With the dosage of ATM + acidified sodium silicate 20 + 300 g/t，and compared that with no use of the inhibitor，the rough concentrate grade of WO3 increases from 0.62% to 1.42%，and the recovery increased significantly，which creates conditions for improving the quality of concentrate and reducing cost subsequently.
    Test on Vanadium Extraction from Weathering Coal Stone in Shaanxi Province
    YAN Ping-Ke, ZHANG Xu, ZHAO Yong-Shuai
    2016, 45(03):  95-97. 
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    In order to extract vanadium from weathering coal stone in Shaanxi with high efficiency at a low cost，vanadium of which accounts for 1.20%，conditions of sulfuric acid curing and hot water leaching were studied.Results showed that with the mass ratio 10∶4 of mix coal samples with particle size -200 mesh accounting for 80% and 98% concentrated sulfuric acid，then curing at 140 ℃for 3 h，and adding fresh water according to the liquid solid ratio of 2 mL/g after cooling to room temperature，stirring (300 r/min) and leaching for 30 min at 50 ℃，vanadium leaching rate reached 76.10%.Test index is good and it is a high efficiency and low cost process for vanadium extraction from this coal stone.
    Desulfurization and Aggregation Desilication Reverse Flotation Experiments on a High Sulfur Bauxite in Guangxi
    CAI Zhen-Bo, XU Hui-Hua, CHEN Qiu-Hu, LU Yan-Ping
    2016, 45(03):  98-102. 
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    Aiming at the difficulty in utilizing high sulfur bauxite，beneficiation experiments of desulfurization by reverse flotation and desilication by aggregation flotation and an efficient bauxite collector of ZY-01were carried on the high sulfur bauxite in Guangxi.The aluminum concentrate with alumina-silica ratio 7.38，alumina grade of 63.31%，recovery of 78.52% and the sulfur concentrator with 16.78% sulfur and recovery of 80.72% were obtained through the desilication reverse flotation process of one roughing-one cleaning-one scavenging and aggregation flotation process of one roughing-two cleaning-two scavenging.The aluminum concentrate can meet the production requirements for alumina oxide.
    Process Mineralogy Study of a Titanium Iron Ore of Shandong
    MA Chi, WEI Min, BIAN Xiao-Dong, WANG Shou-Jing
    2016, 45(03):  103-106. 
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    In order to meet the development of the a large magmatic shaped-type ilmenite resources，the research on the process mineralogy of a representative ore was carried out.Results show that:①The main useful minerals are ilmenite and magnetite in ilmenite ore，secondary titanium containing mineral is titanite，and gangue minerals are mainly amphibole and pyroxene.②Coarse ore ilmenite are closely associated with magnetite and sphene，and the size of three aggregates mainly concentrated in the 0.5 ~ 0.1 mm.With the solid solution isolating structure，fine，microfine ilmenite and sphene are distributed in pyroxene，hornblende and biotite in general，with particle size less than 0.004 mm.③That the titanium-containing minerals like amphibole and pyroxene，and ilmenite，titanite exist in a very fine particle isolating structure of solid solution is the main reason for lowering TiO2 recoveries.④ As many as 54.42% of iron element exists in silicate，carbonate and metal sulfide is the main reason for low iron recovery.The ilmenite ore belongs to refractory ilmenite ore.
    Geological Characteristics and Ore-prospecting Prospect in the Depth of Zini Copper Deposit in Yunnan Province
    YANG Zong-Yao, LANG Xing-Hai, HE Yuan, MENG Zhan, XIE Fu-Wei, YIN Xue-Qin
    2016, 45(03):  107-112. 
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    In order to provide reference for the deep prospecting work of the Zini copper deposit,firstly，the regional ore-forming geological background and the metallogenic regularity of the adjacent mining area are analyzed comprehensively；then,based on the core logging of the 156 drills that are already constructed and geological mapping of the mining area,the deposit geological characteristics such as ore-body occurrence characteristics，ore-controlling factors,alteration characteristics are summarized systematically;finally，based on the metallogenic geological background and deposit geological charactersitcs,the deposit genesis and deep prospecting prospect of the the Zini copper deposit are discussed in depth.The results show that:①the morphology of the ore-body of the Zini copper deposit is mainly controlled by fault fracture zone,the metallogenic materials along the fault fracture zone from the deep to the shallow and mineralized in the corner of the fault fracture zone.②the extruded fault that is the production of the subduction between Garze-Litang oceanic crust and the Zhongza block is not noly the ore-controlling fracture but also the destructive fracture,it show that the genesis of Zini copper deposit is closely related to the large-scale tectono-magmatic activities of the Yidun island area Indo-Yanshan epoch，the middle-low temperature hydrothermal alteration characteristics of chloritization，sericitization，silicification and carbonatization which are throughout the fracture zone indicate that the ore-forming fluid with the middle-low temperature magmatic hydrothermal characteristics.③Based on the alteration and structural characteristics,it is pointed out that the lithologic contact surface of the top part of the upper triassic Hagong formation(T3ha3) and the middle part of the Hagong formation(T3ha3) and the corner of the fault and the flat-ramp have great metallogenic potential,they can be regarded as the most favorable position for the further detailed exploration work.
    Metallogenesis and Prospecting Direction of the Daping Gold Deposit in Yuanyang County，Yunnan Province
    LI Xing-Jian, ZHANG Da, ZHANG Yao-Yao, DI Yong-Jun, LIU Jun, BU Xing-Chen
    2016, 45(03):  113-118. 
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    Daping gold deposit is one of the typical deposits in the Ailaoshan metallogenic belt，it is regarded as the vein-type gold poly-metallic sulfide deposit that is commonly developed in close association with the product of collision orogenic environment.In order to analyze the deposit genesis types of the Daping gold deposit in Yuanyang county,Yuannan province,based on the regional metallogenic background and the geological exploration results of the Daping gold deposit in Yuanyang county,Yunnan province,the typical deposit geological characteristics,mineral assemblage characteristics and wall rock alteration characteristics are discussed in depth,the metallogenic period is divided,besides that,the basic research results of the ore-forming materials and ore-controlling tectonic characteristics are also analyzed in detail.The results show that:①the gold deposit is controlled by sinistral strike-slipping shear,the main ore-bodies are developed in the transition part of tense-compression shearing space.②the metallogenic material source is varied,they are affected by multi-phase tectonic mineralization and superposition reconstructed by poly-genetic thermal fluid combination,so,the Daping gold deposit in Yuanyang county,Yunnan province is a vein-type poly-mental deposit with middle temperature.Based on the above research results,the prospecting indicators and prospecting direction in the mining area are discussed,the result show that the prospecting work in the mining area should be conducted in the area where the alkali-rich porphyry is developed and tectonic activities superposition,the key prospecting portion is the area where the lamprophyre and granite porphyry are exposed,in addition,the poly-metallic sulfide enrichment places should also be paid attention.The above research results can provide reference for the further deep prospecting and prediction in the mining area.
    Design and Realization of GIS System for Mining Method Selection of Metal Mine
    LIU Ya-Jing, Yao-Ji-Ming, RAN Wei-Wei
    2016, 45(03):  119-123. 
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    Selection of mining method plays a very important role in mine production.How to optimize the mining method has been always concerned by the designer.Fuzzy mathematics theory and AHP are used to realize the selection of mining method and optimize the mining method selection system under two and three-dimensional integrated environment.Several aspects of architecture design，functional modules of the system analysis，system database functions and the achievement of system are elaborated.The application of the system can effectively improve the efficiency and accuracy of selecting mining method，and reduce the subjectivity of human judgment，thus effectively reduce the production and operation costs in mining process，and improve the efficiency of mine enterprises.
    Research on Key Issues of Truck Dispatching System in Open-pit Mine
    ZOU Ye-Bin, XIANG Shi-Yao, XU Xiao, CHEN Yi-Jin
    2016, 45(03):  124-127. 
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    The truck dispatching system for open-pit mining is an integration of real time monitoring and dispatching system for mechanical equipment，production management statistics system and large mine truck tire monitoring system.On the background of this system，the structure and framework of the whole system is analyzed，and a series of key technologies of the system are discussed.As for the system architecture，a variety of wireless communication transmission modes based on C/S architecture to realize the interconnection between the system′s endpoints are proposed.As for the key technology of system construction，the vector map of the entire mine is displayed by independently developed VGMapGIS control.The network structure of the system is divided into 6 layers，and data communication is realized by using the custom data packet and 9 types of data flow and communication process.Database is used to store a series of mine data information.Finally，the application effect of the system is demonstrated through the practical application.The research results provide the pattern and support for the overall design idea，system structure and key technology of the intelligent and information system construction of the mine.It has a reference value for the construction of similar systems.
    Establishment and Application Research of the 3D Printing Entity Models Based on the "Standard Parts" of Mine
    WANG Lian-Cheng, LIU Qin, LI Yang, LIU Xiao-Bo
    2016, 45(03):  128-132. 
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    Constructing entity models of mines through 3D printing technology is of great significance to guide mining teaching and production.Focusing on the complexity of mining engineering and capacity limitation of desk 3D printer，a new method of constructing "standard parts" of the mining models is proposed，which means that elements such as roadways ，bottom structures，and chambers，after being classified，will be designed into "standard parts" and conjunction parts according to certain rules.Then，these elements are printed into entities，and finally made up of different mining models.This method is common，repeatable and easy assembly which can also transform the mining model from virtual 3d to the realistic 3d.The application of research achievements to teaching can not only overcome the shortcomings of the traditional teaching model，but also improve students' learning enthusiasm and sense of the innovation.Integration the data of mines into the solid model of 3D printing can provide decision-making basis and measures for the production safety of mines.
    Applications of New SLon Vertical Ring and Pulsating High Gradient Magnetic Separator
    XIONG Da-He
    2016, 45(03):  133-138. 
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    Several new models of SLon vertical ring and pulsating high gradient magnetic separators and their application in mineral processing companies to drop cost and raise efficiency were introduced.SLon-2250 applied in Yuanjiacun Iron Mine of Taiyuan Iron and Steel Company，made the tailings grade of high intensity magnetic separation dropped 1.70 percentage points and iron recovery raised 2.55 percentage points；With SLon-2000-1.3T applied in Lilou Iron Mine in Anhui Province and Dong'anshan Sintering Plant of Anshan Iron and Steel Company to process oxidized iron ores，iron recoveries raised by 6.92 and 4.28 percentage points，iron recovery raised 19.87 and 12.92 percentage points respectively；With SLon-2500 new model applied in Meishan Iron Mine of Shanghai Baoshan Iron and Steel company，the high intensity scavenging magnetic concentrate grade increased 1.91 percentage points，tailings grade of scavenging high intensity magnetic separation dropped 1.63 percentage points，iron recovery raised 3.82 percentage points；SLon-2000-1.5T，SLon-2500-1.5T and SLon-2500-1.8T have been successfully applied in feldspar and quartz purifying industry with good technical and economical results achieved.
    Development of Double Circular Moving Magnetic System Dry-magnetic Separator for Fine Powder
    HOU Xin-Kai, YANG Hong-Yi, MA Xiao-Yu, DONG Yue-Bin, LIU Zhu-Shen
    2016, 45(03):  139-142. 
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    For the purpose of solving low efficiency and low output per machine-hour of dry magnetic separation for fine powder，a new type of high efficiency dry magnetic separator for fine powder was developed which is called double circular moving magnetic system dry-magnetic separator for fine powder.The device consists of enrichment of particles with magnetism and concentration，and scavenging of nonmagnetic particles，however each working area is relatively independent.The problem of low efficiency of separation owing to great agglomerating force between fine particles has been solved，since fine particles with well dispersed state are not prerequisite in whole separation process.The device possesses long double circular moving magnetic system structure and has the advantage of a long separation area，which is the key to achieve efficient separation.In the separation of the materials containing hydration active ingredient such as steel slag powder by the device，the ingredients is not destroyed by hydration reaction，and the magnetic minerals are efficiently extracted，as a result of raising the quality of the steel slag powder as addition of cement by a level.The separation results on steel slag powder from Taiyuan Iron & Steel Co.，Ltd.with the average particle size 30 μm，the specific surface area 307 m2/kg and the iron grade 14.86%(magnetic minerals content of 30.09%) show that iron grade and recovery of concentrate reaches 32.21%( magnetic minerals content of 65.22%) and 90.30% respectively，and the activity index of tailings is improved over 15 percentage points.The device is good at separation of the fine materials containing hydration active ingredient.
    Improved Non-local Means Filtering Algorithm in Wavelet Domain of Mine Video Images
    WANG Ping-Jun, WANG Wei
    2016, 45(03):  143-146. 
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    Due to the high concentration dust and uneven illumination,it is easy to make the mine video image contains a lot of noises,the mine video images obtained in real-time are vague as a whole,it affect the interpretation and analysis of them,in order to make use of the mine video images as much as possible,it is necessary to conduct mine video images processing.Based on wavelet transform that a effective images analysis method,a new mine video images filtering algorithm in wavelet domain is proposed.Firstly,the mine video image is conducted two-layers wavelet transform,the low-frequency decomposition coefficients and high-frequency decomposition coefficients are obtained,the low-frequency decomposition coefficients and high-frequency decomposition coefficients are conducted inverse wavelet transform respectively,the spatial domain low-frequency image and high-frequency image of the original mine video image are obtained;secondly,according to the characteristics of low contrast and without noises interference basically of spatial domain low-frequency image,the homomorphic filtering algorithm is adopted to conduct image enhancement;then,based on analyzing the characteristics of the non-local means filtering(NLM)algorithm,the similarity weighted calculation method and searching scope of the image blocks of non-local means filtering(NLM) algorithm are improved,a improved non-local means filtering(INLM) algorithm is put forward,it is used to filter out the noises in spatial domain high-frequency image;finally,the enhanced spatial domain high-frequency image and filtered spatial high-frequency image are superimposed.The mine video image obtained in Wangjiazhai coal mine of Xinren county,Guizhou province is taken as the experimental object,the structural similarity(SSIM)and root mean square error(RMSE)are used to evaluate the performance of the above algorithms.The results show that the performance of the algorithm proposed in this paper is superior than the non-local means filtering (NLM) algorithm and its two improved algorithms,it has some reference for the mine video image processing.
    Effect of Mine Wastelands Vegetation on Soil Properties
    CHEN Jin-Hui
    2016, 45(03):  147-150. 
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    Soil is the important composition of ecosystem.Mine soil generally is seriously degraded and directly affects vegetation growth，so the way of vegetation restoration in coal mine has important influence on soil physical properties and nutrients.Based on the research status at home and abroad，6 planting restoration methods were set up in mine spoils，and compared with the original wasteland.Chemical and physical properties of soil is the main factor of determining soil fertility.The physical and chemical characteristics of the soil samples collected after recovery were analyzed，and the correlation analysis was done on impact factors.The principal component analysis was adopted to evaluate the improvement effect of the program.Research showed that:there exists significant difference in soil physical and chemical properties under the different recovery mode，and the physical and chemical properties of improved soil were greater than the original.The improved effect of matched group is better than the pure forest，among which the mixed forest of sea-buckthorn and amorpha fruticosa is best.
    Study on SEA Safety Management Mode and Its Application in Open-pit Slope
    SUN Hou-Guang, LI Shi-Hai, FENG Chun, PAN Peng-Fei, GUO Ru-Kun, QIAO Ji-Yan
    2016, 45(03):  151-155. 
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    A new safety management mode for open-pit slope is proposed.In this mode，scientists of engineering sciences，field engineers and mining administrators are connected together to manage the open-pit slope according to information technology.Scientists of engineering sciences are mainly responsible for the potential risks searching，monitor scheme designing，slope stability evaluation and treatment plan of slope engineering determination.Field engineers are in charge of slope safety inspection，blasting hazards observation，slope monitoring equipment layout and various types of field data collection.Mining administrators preside over the organization and coordination，supervision and decision-making and emergency rescue.Based on such SEA management mode，a new concept for controlling open-pit slope is proposed，and the scientific connotation of this concept is introduced in detail.The new concept could be summarized as "monitoring headed，following probabilistic classification，status tracking，forecasting based on conditions，and disaster region simulating".SEA mode is practised preliminary in Anqian mine，According to the close and seamless cooperation among field engineers，scientists and mining administrators，the abilities about slope safety management，disaster early warning and scientific protection are enhanced.
    Effect of the Nozzle Arrangement on the Dust Removal Efficiency by Water-cloud
    LIU Zhi-Chao, LI Bin, SONG Wen-Ya
    2016, 45(03):  156-159. 
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    In order to study the effect of the nozzle arrangement on the dust removal efficiency by water-cloud，the experimental platform which was made up of dust making system，mist supple system and test system was designed.Experiments on different nozzle arrangements were carried out to obtain the effect of the mist pressure and the nozzle arrangement on the dust removal efficiency.With the mist pressure increasing，the dust removing efficiency improved.But when the mist pressure was over 1.6MPa，and the increasing of speed was becoming slow.Under different pressure，the dust removal efficiency of double nozzles is better than that of single nozzle.The longer distance between nozzle and dust resource，the higher the dust capture efficiency is，but the lower the respirable dust capture efficiency is.
    Direct Dust Fall Technology for Chamber in Underground Metal Mine
    GU Xin-Yu, SHI Jun-Wen, WANG Ting-Yin
    2016, 45(03):  160-162. 
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    According to the characteristics of high concentration and long lasting of duct after blasting or at ore-drawing of chamber in underground metal mine，and through analyzing the reasons for the defect and deficiency of the existing dust suppression by spraying，it is proposed that high-pressure dust suppression spray is used to directly spray water on the dust，which can reduce the dust concentration after blasting or at ore-drawing from the beginning.According to this idea，the dust suppression spray is designed for underground metal mines.The dustfall spray can be controlled by the dust concentration sensor to realize automation of the dust removal process.At present，this technique has been applied in Huibaoling Iron Mine，and shortened 60% of time on fume after blasting，reduced dust concentration above 75% in mine roadway，and lowered the dust concentration above 60% in upper level of the air return roadway.
    Comparative Analysis based on Landslide Probability and Safety Coefficient
    RAO Yun-Zhang, PENG Hua-Dong, ZHANG Xue-Yan, WANG Dan
    2016, 45(03):  163-167. 
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    Landslide probability method and safety coefficient method are used to analyze slope stability，and applications of the two methods to stability analysis are contrasted.Selecting six factors of heavy，cohesion，internal friction angle，slope angle，slope height，pore pressure ratio as landslide factors，with 36 slopes as cases，the logistic regression model and deterministic coefficient are adopted to solve the probability of landslide slopes with SPSS software.Combining with the slope safety factor，the stability safety factor and probability of landslide stability of slope examples are classified.Then，after analysis and comparison，the difference for slope stability level between the landslide probability method and the safety coefficient method is obtained.The results show that slope stability level obtained by the two methods is approximately the same，indicating that both of the methods have good applicability and accuracy.Safety coefficient method is relatively mature and trending towards quantitative evaluation.Landslide probability belongs to the qualitative evaluation，but its research method is insufficient.
    High-voltage Power Lines Pylons Foundation Subsidence Dynamic Prediction and Monitoring Method in Mining Area
    CAI Lai-Liang, LIU Yun-Bei, MENG Wan-Li, XU Zhi-Song, WANG Shan-Shan
    2016, 45(03):  168-171. 
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    The pylons foundation subsidence dynamic prediction and monitoring method in a mining area are studied.Firstly,based on the dynamic prediction principle of surface subsidence of probability integral theory,the high-voltage power lines pylons foundation subsidence dynamic prediction method is designed,the subsidence values and inclined values of the central points of the high-voltage power lines pylons foundation in different periods are predicted dynamically,based on some relative specifications of the operation of high-voltage power lines,the safety levels of the high-voltage power lines pylons are analyzed;then,the displacement of the basic points of the high-voltage power lines pylons in the research area are monitored by adopting GPS-RTK,the calculation method of the inclined values of high-voltage power lines pylons based on the principle of plane fitting is proposed;finally,the comparison of actual measures values (subsidence values and inclined values) and prediction values are conducted to analyze the feasibility of the high-voltage power lines pylons foundation subsidence dynamic prediction method proposed in this paper.The experimental results show that the differences of the prediction values (subsidence values and inclined values) of the high-voltage power line pylons that are located in the central area of the subsidence basin is small,on the contrary,the differences of the prediction values (subsidence values and inclined values) of the high-voltage power lines pylons that are near the edge of the subsidence basin are obvious.The experimental results further indicated that the high-voltage power lines pylons foundation subsidence dynamic prediction and monitoring data processing method proposed in this paper is practicable,under the allowing conditions,it is suggested that the observation method which precision is higher than RTK can be used in the monitoring process of the high-voltage power lines pylons that are near the edge of the subsidence basin.
    Calculation of the Tangent of Major Influence Angle Based on Random Forest Regression Model
    ZHAO Bao-Cheng, TAN Zhi-Xiang, DENG Ka-Zhong
    2016, 45(03):  172-175. 
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    The tangent of major influence angle (tanβ) is an important parameter for mining subsidence prediction，and it plays a key role to determine the subsidence basin boundary.In order to calculate the tanβ value quickly and accurately to improve the accuracy of mining subsidence prediction effectively.Firstly,the geological and mining factors that are affecting the value change of tanβ are discussed in detail,the five basic variables (mining thickness,dip angle of coal seam,mining depth,working face slanting length,lithology influence coefficient) are determined;then,the basic principles and basic implementation process of random forest algorithm (RF) are analyzed in depth;finally,the random forest regression model is established to calculate the tanβ value,the actual measured data of the typical surface movement observation stations that are located in the part of the main mining areas in China are regarded as the training and test samples of the regression model established in this paper.The test samples are used to conduct inspection and analysis of the random forest regression model after training,the results show that:①the minimum relative error and maximum relation error between the tanβ calculated by the regression model established in this paper and the actual measured data are 0.381% and 2.563% respectively.②the regression model established in this paper has stronger generalization ability,it has the characteristics of fast calculation speed and high accuracy in the calculation process of tanβ,besides that,it also has a good application prospect in the practical engineering,it can provide reference for calculating the tanβ value with high accuracy.
    Flotation Recovery of Rare Earth Minerals in Baotou Steel Rare Earth Tailings
    ZHANG Yue, LIN Hai, DONG Ying-Bo, LI Guo-Dong, WANG Xin, XU Xiao-Fang
    2016, 45(03):  176-179. 
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    The rare earth minerals in Baotou Steel rare earth tailings have great value.The yield of -74 μm of tailings is 77.73%.REO content of tailings is 5.97%.The main rare earth minerals are bastnaesite and monazite，the content of which are 4.40% and 3.80% respectively.Reconcentration by flotation experiments on the tailings were carried out.The results indicated that，under conditions of the grinding size of 95% passing 74 μm，pulp concentration of 40% and pulp temperature at 30 ℃，NaOH dosage of 3 000 g/t，silicate sodium dosage of 2 000 g/t，H205+LD dosage of 400+300 g/t，rare earth concentrate was obtained by using process of one roughing，three cleaning，one scavenging，and middles back to the flowsheet in turn.The final concentrate REO grade is 45.08% and recovery is 75.27%.
    Effects of Fly-ash on Micro Expansion Concrete with Alkali-active Aggregate
    YANG Dong-Peng
    2016, 45(03):  180-184. 
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    For the engineering application of alkali-active aggregate in mass concrete，the alkali-silica reaction inhibition test，compressive strength test，autogenous volume deformation test and the fast freeze-thaw test using alkali-active aggregate with different dosage of fly ash，light-burned MgO were carried out.The tests showed that：alkali-silica reaction is effectively restrained when the fly-ash content is 30% and light-burned MgO content is 3%~5%；Fly-ash make concrete early strength reduced，the late strength increased fast，and the amount of 3%~5% light-burned MgO dosage has little impact on the strength；light-burned MgO autogenous volume deformation will be reduced by hydration of fly-ash，but fly-ash cannot change this characteristics of light-burned MgO；fly-ash has adverse effects on frost resistance of concrete，and light-burned MgO can improve the frost resistance of concrete.So，the reasonable dosage of fly-ash and light-burned MgO make the alkali-active aggregate concrete possible be applied in the mass concrete.
    Research on Comprehensive Utilization and Harmless Deposition of Meishan Tailings
    YANG Long
    2016, 45(03):  185-188. 
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    Iron grade of tailings in Meishan is high and particle is fine. It's difficult to dewatering, which limits its application in cement. In order to resolve the problems of tailings deposition, according to Meishan producing mining and mineral processing technology, the experiment of tailings dewatering and fine tailings thickening and solidification research were conducted. By using long cone hydrocyclone and ceramic filter technological process, more than 70% tailings can be used in cement production. Overflow of hydrocyclone processed by super-pressure thickener without rake, stable paste with concentration more than 52% can be obtained. Stabilizer MA and YX can well solidified paste, compressive strength of solidification can reach 0.20 MPa and 0.70 MPa after 3 d and 28 d, the solidification is hard to sliming, can satisfy the subsidence storage requirements.