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    15 March 2015, Volume 44 Issue 03
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    Research Advances in Three-dimensional Orebody Modeling Methods
    HE Yu-Hao, CHEN Yong, MIAO Zuo-Hua, GAN Yong
    2015, 44(03):  1-7. 
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    As one of the core contents in the digital mine construction，new methods of orebody three-dimensional modeling have emerged continuously in recent years.Three-dimensional modeling methods are summarized around six aspects such as data sources and data interpolation of ore-body three-dimensional modeling，surface element modeling，volume element modeling，hybrid and integration modeling，automatic modeling and model dynamic update.The results show that：① drilling data is the most widely used in three-dimensional orebody modeling.The focus of the research is how to add virtual drill hole based on limited drilling data and how to attribute interpolation to the orebody volume element.② Connecting contours of geological section along exploratory line is mainstream surface element modeling method，which involves three key issues including contour corresponding，contour veneer and branch processing；③The main study direction of the volume element modeling are modeling efficiency and accuracy，constructing the new topology to better achieve the model cutting，splitting and spatial analysis and the expression of complex geological structure; ④ The study on hybrid and integration modeling usually focuses on modeling efficiency and accuracy.The researches on orebody data redundancy and consistency problems in the hybrid model，ties and topological consistency problem of integration model can rarely be found，which has restricted the promotion and application of the model; ⑤ Automatic modeling and model dynamic update are the most challenging research direction，which relates to the vitality and the utilization potential of the model.The related researches are still in its initial stage of exploration at the moment.
    The World Pattern of Copper Resource
    GU Xiao-Wei, XU Xiao-Chuan, WANG Qing, LIU Jian-Ping
    2015, 44(03):  8-13. 
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    The worldwide distribution trait of copper resource is analyzed.Based on the historical data，the market supply and demand traits are studied from the aspects of copper production，consumption，import and export，while the market changing trait of copper resource impacted by the important events and the evacuation route of copper consumption boom also are studied.Under the condition of China's rapid economy development and industry process accelerating，the supply and demand of copper resources in China is emphatically analyzed，and the impact of China's economic development for global copper industry and the bottleneck of restricting China's copper industry development are studied.
    Stage Deep Hole Open-stope and Caving Combined Mining Method for Steeply Inclined Thick Ore-body
    YU Qing-Jun, HU Zhong-Qiang, LI Yuan-Hui
    2015, 44(03):  14-18. 
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    With Hongling mining area with Pb-Zn polymetallic ore-body as the research object，experimental researches are carried out aiming at problems in exploration of lead and zinc ores including small production capacity，low labor efficiency，large quantities of stripping and cutting，high cost，large exposed area of stope roof，poor safety and higher costs at maintenance.Through the complex processes of joint mining within ore vein or not，stage drilling，deep hole parallel millisecond precision blasting and caving，stage concentrated ore-drawing by scrapers，pillar recovery by once blasting and isolation of goaf，good index of production capacity of 970 t/d，loss rate of 3.l9%，dilution rate of 5.25% and direct mining cost at 29.22 yuan/t in the industrial field tests were obtained.Experiments proved that this mining process has characteristics of simple and practical operation，high labor efficiency，large production capacity，and low mining cost.It also can avoid the huge loss of pillars，and is a great progress in the safe and highly efficient mining technology for steeply inclined thick ore-body.
    Optimization of Stage Height Plan in Gently Inclined Multilayer Deposits Based on 3DMine
    ZHANG Meng-Meng, YE Yi-Cheng, LU Ya-Qi, LU Fang
    2015, 44(03):  19-22. 
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    Research on optimization of stage height plan in mining deposit is one of the tasks that have a direct relationship to the safety reliability and management benefit in mining production.Taking a development system of some gently inclined multilayer deposits as foundation，a 3D development system model was built first by using the 3D visualization technology of 3DMine mining software to realize the 3D visualization of the underground mining engineering of the complex multilayer deposits；Secondly，the stage development engineering entity model was built based on a CAD design，with the functions of multi-dimensional visualization of middle-section developing engineering，calculation of the mining capacity，and computation of the engineering quantities.And the models' dynamic section and transparency were shown as well；Lastly，the stage height optimizing plan with minimum unit stage quantities was taken to optimize the four alternative plans.The optimized plan is consistent with the actual mining，which verifies that the 3D visualization optimization of stage height is reliable and practicable.
    Production Scheduling Optimization of Open Pit Coal Mines Considering the Ecological Costs
    WANG Qing, XU Xiao-Chuan, GU Xiao-Wei, LIU Jian-Ping
    2015, 44(03):  23-27. 
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    For a given boundary of the open pit，production scheduling is made to determine the advancing position and the striping and mining of the pit each year.Different production scheduling has different advancing positions and capacity of mining and stripping，resulting in different damage areas of stope and waste dump and the emissions of pollutants each year.All these cause some degree of ecological damage.In view of these，according to the optimum boundary obtained，a series of pits with optimum geological feature have been produced and realized dynamic sequencing by the cone exclusive method.Then a dynamic programming was used to design multiple production schemes for a large open pit coal mine.According to the space-time sequence of mine environment damage，mine ecological footprint and cost models were constructed to assess the relationship between the production program and the environment.The results show that different production scheduling has different ecological impacts and the ecological costs take a larger proportion of the total net value.At the same time，ecological costs have an impact on the selection of optimized schemes.
    An Approach of Open-pit and Underground Cooperative Mining and Filling
    REN Feng-Yu, ZHANG Dong-Jie, LI Hai-Ying, SONG De-Lin
    2015, 44(03):  28-31. 
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    According to the conditions of parallel belt at low-grade iron ore deposits in southeast area of Gongchangling Iron Mine and control requirements of surface subsidence area caused by high drop mining，the problems of the low productivity and poor benefit created by using conventional cut filling method are analyzed to control surface rock movement，the control action of granular in collapse pit to the solid side wall is studied，and a new filling approach for controlling the range of the surface subsidence by using the critical medium column theory is proposed.In the paper，the arch conditions of moving granular is studied on trial，which reveals the continuity of granular flow in collapse pit，and draws the conclusion that filling waste rock into collapse sink would not cause arch and fall hazard.The composition of collapse pit wall is observed and analyzed to reveal the characteristics that the surrounding rocks slide or chip mainly along the weak structural plane，and accordingly safety filling measures that the filling waste cooperative emissions along the collapse pit axial and radial is put forward to prevent side wall slipping；In addition，the large structural parameters sublevel caving is adopted for underground to increase mining intensity and balance the decline rate of granular in collapse pit，which forms the open-pit and underground cooperative mining and filling methods.It is proved by theoretical analysis and industrial experiments that the method above can enhance production efficiency and improve the working environment largely，and create an environmental protection and high efficient mining approach for the steep iron deposits with low-grade parallel belt.
    Mechanized Upward Horizontal Cut and Fill Method for the Broken Roof and Water-rich Mine
    XU Heng, WANG Yi-Ming, AI Chun-Ming, LIU Xiao-Hui
    2015, 44(03):  32-35. 
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    In view of the issues of a copper mine in east China,such as roof breaking,easy roof fall,rich water and floor water inrush,and based on the original mining with pillar layered backfill,a new scheme of mechanized backfill mining is put forward.This scheme takes full advantages of the upward horizontal cut and fill method,which can reduce ore loss and dilution rates,effectively control ground pressure and prevent mine disasters such as roof collapse,wall caving and water bursting.Combined with the characteristics of mechanized mining,such as high production efficiency,low cost,safe operation of mining and a good working environment,the mechanized upward horizontal cut and fill method is adopted.The interval filling by cemented filling with unclassified tailings filling is applied to realize continuous mining,and the component of cemented filling are the composite high-water-content and quick-setting materials and tailings.The production results showed that the new method make mining efficiency enhanced by one-third,the recovery rate increased by 4% and the ore dilution rate reduced by 0.4%.Also it provides well guarantee for the mine work safety,and effectively solves the problems of the mine roof fall,water inrush,and low production efficiency.It can be used as a reference for design and construction of other similar mine.
    Research of the Mining Method for a Medium or Thick Ore-body under the Soft Surrounding Rock
    KOU Kun, NIE Xing-Xin
    2015, 44(03):  36-39. 
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    A mining area is located under a lake district.It mainly contains gold and copper mine with a higher grade.The ore body in the mining area belongs to the medium and thick ore body under soft surrounding rock with poor stability of roof.Combined with ore-body′s occurrence conditions and the existing mining conditions,the numerical simulation software FLAC3D was adopted to investigate the stope parameters for three mining methods of medium-length hole sub-level caving with subsequent filling,shallow hole shrinkage stopping with back-filling,and the upward horizontal slicing and filling method.Based on comparison among 6 kinds of simulated mining processes on surrounding rock stress and displacement,the width and the length of stope were initially determined as 14 m and 40 m respectively; Based on the initial stope parameters,maximum and minimum principal stresses,and displacement of roof and pillar,the corresponding stope width parameters for three different mining methods were all determined to be 14 m,and the length was 40 m,40 m and 42 m respectively.Stress of roof and pillar,and rock movement should be monitored at any time to strengthen roof management and make filling in time.Finally,the main task at the next stage was put forward to determine the reasonable filling body strength and the filling material.
    Techniques of Underground Water Leakage Control in Meishan Iron Mine
    WANG Wen-Feng, GAO Feng, XU Zhi-Cheng
    2015, 44(03):  40-43. 
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    Aiming at the risk in the production safety caused by underground leakage water in Meishan Iron Mine，the comprehensive governance technology program of underground water leakage was researched and applied on the basis of hydrogeological condition and mining current situation analysis of Meishan iron mine.According to the field status of underground water leakage，it is indicated that the decreased stability of the part of exposed mine rock after meeting water is mainly caused by geological structure，mineral composition，and artificial activities.Based on surface subsidence caused by the caving mining，the characteristics of rainstorm infiltration are analyzed.Water balance method is adopted to forecast water inflow，obtaining that daily rainstorm infiltration rate is 8%.Underground water leakage was divided into mining area leakage and shaft leakage.By comprehensive comparison，curtain grouting is applied to auxiliary shaft，southwest shaft，and north shaft.Local grouting program is used in 1# shaft.Tunnel leakage phenomena were subdivided in 5 types，including roof watering，bottom and corner seepage，tunnel wall holes seepage，large area tunnel watering，leakage and the water pocket in surrounding，and relevant measures for each type were proposed.Significant effect for underground leakage water control in Meishan iron mine was achieved by adopting the programs above.
    Research on the Mining Method of the Deep Ore-body of No.2 Pit of Jinning Phosphate Mine under Yunnan Phosphate Chemical Group
    LI Xiao-Shuang, LI Yao-Ji, WANG Meng-Lai
    2015, 44(03):  44-47. 
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    In order to determine the mining method for exploiting the deep ore body of No.2 pit in Jinning Phosphate Mine of Yunnan Phosphate Chemical Group Co.，Ltd.，and taking the deep slowly inclined-thin to medium thick-soft interlayer ore body of No.2 pit in the Mine as the research object，on basis of the field investigation，theoretical analysis and scheme comparison，the comprehensive analysis on the occurrence characteristics of ore body mining engineering，the technical conditions and the bottom characteristics of surrounding rock are made.The results show that:①the mixed mining way of ① seam，①1 seam and ①2 seam should have been carried out，and the ore grade could reach 22.97% with the high resource recovery after mixing the ores.②For the typical hard-to-mining ore body of No.2 pit in Jingning phosphate mine，it is very difficult to obtain the ideal economic and technical index by using a single mining method.The section shrinkage-caving method is the right one to take as the mining method to the hanging wall seam.Duo to the thin seam for the footwall seam，the shallow-hole shrinkage mining is taken as the better mining method.The related results provides certain reference for the deep mining of Yunnan phosphate group corporation and the open pit mining of phosphorus mines under similar conditions.
    Improvement Measures of Stope Filling Dewatering Process in Sanshandao Gold Mine
    YAN Bing-Qian, YANG Peng, 吕Wen-Sheng
    2015, 44(03):  48-52. 
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    The dewatering of stope filling has a greater impact on the initial setting time of the filling body and its short-term and long-term strength.The overflow dewatering was used in Sanshandao Gold Mine by overflow tube，and penetration dewatering was used by filling retaining geotextile，but the dewatering efficiency can not meet the requirements of field work.The main influence factors of the filling dewatering rate was analyzed on the basis of theoretical research on the filling dewatering，and many improvement measures of filling dewatering are put forward.Additional vertical or inclined dewatering tubes can be used to discharge the filling gravity water more efficiently，meanwhile avoid dewatering tube clogged by the fine-sized particles in filling slurry.The improved design of filling retaining wall and selection of treatment cloth can avoid the fine-sized particles gathered near the water treatment cloth in short time which can affect penetration dewatering.The water filter of filling tube was designed to filter part of free water in filling slurry before filling the slurry into the stope area，improve concentration of filling slurry，and reduce workload of stope filling dewatering.Changing simple dewatering way to further improve the efficiency of the stope filling dewatering，can avoid from affecting the development of the next mining work.
    Simulation of Overburden Deformation-failure during Multi-coal Mining in Daliuta Coal Mine
    SHI Xiu-Chang, MENG Zhao-Ping, YANG Sheng, ZHANG Ji-Xing
    2015, 44(03):  53-57. 
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    Aiming at the problems of development of caving-fractured zone and mining influence，which occur during muti-coal seam mining in Daliuta Coal Mine，and through the similar simulation and the numerical simulation calculation，the overburden collapse，fracture development and surface subsidence law during the exploration of two main coal-seams were systematically studied.It is shown that rock strata of roof will directly fall from the surface after the broken of main overlying strata in shallow NO.2-2 coal seam.In the 5-2 coal seam，the caving and fractured zone caused by the once longwall and full-seam mining will develop into overlying goaf and form the water conductor of water inrush in working face.With the repeat mining strata，ground movement，and deformation value enlarged，the discontinuous damage of strata and surface increased.According to principal stress distribution obtained by numerical simulation results，overlying strata above goaf can be divided into three zones of two-way tensile stress zone，tension-compression stress zone and compressive stress zone.The principal stress state controls the formation and development of mining-induced fractures.Mining influence has a close relation with mining geometries，and surface subsidence value decrease with working face length and mining height reducing.Research results have important guiding significance for safety-mining and design in Daliuta and other coal mines with similar conditions.
    Dynamic Ground Pressure Monitoring and Numerical Analysis of Stope in Liguanji Iron Mine
    LI Zheng-Sheng, LI Hong-Jun
    2015, 44(03):  58-62. 
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    Based on the characteristics of point pillar slice stoping and backfilling method of Liguanji iron ore，the variation of stress including pointed pillar，barrier pillar，filling body，and upper and lower sides wall rock has been monitored and analyzed under the actual mining and filling process of mine.With the consideration of the preferred planes，a rock mass structure model has been constructed by the (3 Dimension Distinct Element Code) 3DEC numerical simulation software.In addition，combined with the actual monitoring and the numerical simulation，and the match with the ground pressure，the pressure variation regularity in the progress of pillar slice stoping and backfilling method was analyzed.Results show that：①At the beginning of mining，the upper loading is supported by the pillars together with the host rock.With the increase of excavation height，the stress is transformed from the point pillar to host rock.The upper stress was mainly supported by the host rock;②The stress in the hanging side and heading side changed alternately with the mining：the stress in excavation layer increased，the stress in backfill layer recovered，and the stress in disturbance layer released.The ground pressure presents as the layered transformation rule in the same pillar and is cycled with the excavation mining.
    Determination of the Largest Bench Height of Belt Dumping Conveyor and the Safety Distance
    YANG Zhong-Lin, YANG Jun-Ming, LI Qiang, JIANG Shi-Lei
    2015, 44(03):  63-67. 
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    In view of the wide application of the belt dumping conveyor in the domestic mine，and in order to maximize dumping ability of the belt dumping conveyor，reduce the moving number of the orbit，and lower the cost of mine production，the largest bench height and the safety distance from the belt conveyor to the top line of the waste dump are analyzed.Based on the basic data，the seepage stability analysis，and the anti-sliding stability analysis，FLAC3D is adopted to simulate the safety distance among the belt dumping conveyors for an open pit.According to the field condition，the potential caving forms at the bench slope of the waste dump under the equipment load are determined，and the safety distance model for the bench of the belt dumping conveyor is set up.The numerical simulation results indicate that the bench height is 75 m，and the safety distance among the conveyors is greater than 10 m.Combined with the experience，the maximum bench height and the safety distance are comprehensively determined，which has a guiding significance for the dumping and production by belt dumping conveyor in an Iron Mine.
    Research on Elevation Amplification Effect of Blasting Vibration in Mine Slope
    ZHANG Wei-Kang, XIE Yong-Sheng, WU Shun-Chuan, XIAO Shu
    2015, 44(03):  68-71. 
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    With the blasting production of Muliashy Open Pit Mine as engineering background，the vibration formula about elevation amplification effect was obtained via dimensional analysis on the physical quantities that affects the attenuation of blasting vibration velocity.By twice checking on the blasting production test data and the comparative analysis，it is founded that the error about vibration velocity calculated through the traditional Sodev′s empirical formula is large when the terrain elevation in the blasting monitoring test varies obviously，with the average error of 40.7%.The error of the calculated velocity through the improved formula of the dimensional analysis is smaller，with average error of 13.3%.The results indicated that the improved formula of blasting vibration velocity via dimensional analysis method can more accurately reflect the elevation magnifying effect of propagation medium on blasting vibration velocity，and its regression result are more realistic.
    Displacement Prediction of In-Situ Leach Mining Slope of Rare Earth Based on EMD-RBFNN Model
    RAO Yun-Zhang, WANG Dan, RAO Rui, SHAO Ya-Jian, ZHANG Yong-Sheng
    2015, 44(03):  72-75. 
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    As data collected from the online monitoring system of in-situ leach mining would contain a lot of noise and interference signals due to some influencing factors including temperature difference，frost and disturbance，it is difficult to reach a scheduled data accuracy with the system′s temperature compensation module，resulting in inaccuracy in the follow-up forecasting and pre-warning work.Therefore，after the EMD(Empirical Mode Decomposition) decomposition，the IMF component can achieve freedom refactoring，and remove the high frequency component.It can well purify environment factors on the on-line monitoring displacement data，and the influence of low frequency component can better reflect the actual displacement.The dissertation establishes a forecasting model-EMD-RBFNN（Radical Basis Function neural network）for online monitoring data，levering the best approximation effect of RBFNN，after dealing with the original signal and having the real monitoring data extracted by taking advantage of the adaptive decomposition characteristics of EMD technology.The prediction test is carried out based on the actual measured earth surface displacement data of some rare earth mine.The results show that the surface displacement prediction data boasts more reliability and accuracy as its relative error is within only 0.12%.
    Practice of Mining Under Pillars in Close-distance Mined-out Area in Soft Rock Layer
    ZHU Cheng, DUAN Jun, SUN Zhi-Chao, XU Zhe-Yang, GENG Liang-Liang
    2015, 44(03):  76-79. 
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    Longwall mining under coal pillars in close-distance goaf will be influenced by the remained coal pillars at upper coal seam and the dynamic pressure of the coal face.In view of the characteristics that the roof and floor of No.9 coal seam of some coal mine in Urumqi are soft，the jointed support scheme of collaborative support of beam and cable + grouting reinforcement of top and bottom corners，side-wall bolting + bottom anchor and beam support+ full-section net is proposed after analyzing the failure mechanism of surrounding rocks，namely the integrated treatment of roof，floor and side-wall.Arranging the pressure-relief hole in the roadway is conducive to transfer high stress into the deep tunnel and improve the stress condition of surrounding rocks and support structures.The practice has proved that these measures effectively solved the issues such as roof damage in mining roadway，coal wall spalling and floor heaving etc..Approaches adopted in mining process，including reducing mining height，inclining working face，accelerating working face through coal pillars greatly improved the production conditions in working face，and ensured the mining safety.
    Deformation Mechanism and Control Technology of Roadway With Two-time Kinetic Pressure
    XIE Jun
    2015, 44(03):  80-83. 
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    In order to solve the difficulty of heavy deformation about tendency high level suction roadway of Wuyang coal mines with two-time kinetic pressure，the characteristics of fracture development of 3# coal seam，and the physical property of surrounding rock are analyzed，and the deformation mechanism and failure characteristic of surrounding rock at the dynamic pressurized roadway are investigated through using UDEC4.0 software.Then，the roof and bottom deformation rate，two working slope deformation rate and cross section of closing rate are counted，finally determining that floor heave is the most important reason for surrounding rock deformation.Based on the original supporting scheme，the support parameter is optimized，proposing one reinforcement scheme with two working slope reinforcement + bottom high pre-stress slit wedge tubing yielding anchors supplement reinforcement.Its supporting effect is numerically analyzed.The field experiment data showed：by using this optimized scheme，movement of roadway roof and two sides were reduced by 58.5% and 60.7%，the maximum floor heave quantity is 198 mm，which is 34.2% of the original roadway deformation.Therefore，the supporting method can control deformation of dynamic pressurized roadway with two-times kinetic pressure，and lay a foundation for controlling mine gas and ensuring safety and efficiency in mining.
    Beneficiation Experiments of ilmenite Ore from Vietnam
    DENG Chen-Xiong, YIN Wan-Zhong, YIN Lin-Lin, FU Ya-Feng
    2015, 44(03):  84-87. 
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    In Vietnam there is a ilmenite mine with TiO2 grade of 6.04% and particle size of 62.34% passing 80 mesh.The main metallic minerals are ilmenite and titanomagnetite，and parts of ilmenite have been liberated.In order to make highly efficient exploitation and utilization of the ore，dressing experiments have been done on the representative samples.The results indicated that：①Through the process of gravity of one roughing-one cleaning gravity separation by shaking table，and one stage high intensity magnetic separation for the middlings from the gravity，high quality of Ti-Fe concentrate was obtained.②Through the process of one roughing-one cleaning gravity separation by shaking table，and one stage high intensity magnetic separation for the middlings from gravity，one roughing-two cleaning flotation for mixed tailings of gravity and magnetic separation after regrinding at 80% passing 200 mesh，Ti-Fe concentrate with TiO2 grade of 46.45% and recovery of 77.52% was obtained.
    Research on Flotation Separation of Microfine Refractory Ore in Copper-Molybdenum Separation Process
    GAO Xi-Yu, SUN Chun-Bao, LI Guo-Dong
    2015, 44(03):  88-91. 
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    There are micro-fine mud existed in rough molybdenum concentrate separated from copper-molybdenum ore with a hydrocyclone in a dressing plant of Tibet and large amounts of micro-fine mud in tailing 1 of molybdenum separation.Treating the two kinds of micro-fine mud separately is an effective measure to solve the non-ideal result about copper-molybdenum separation.Under the condition of low pulp density，beneficiation on the refractory copper-molybdenum sample with micro-fine size and high degree of mud is carried out.The results show that the sample with Cu and Mo grade of 23.12% and 2.98% is treated by the closed-circuit process of one-roughing，four-cleaning，one-scavenging and middles back to the flow-sheet.By this method，Mo concentrate with Mo grade of 44.97%，and Mo recovery of 86.46%，and Cu of 1.17%，and Cu concentrate with Cu grade of 24.45%，Cu recovery of 99.71%，and Mo of 0.43% were achieved separately with good Cu-Mo separation effect.
    Silver and Copper Sulfide Concentrate Smelting Process by Pyrometallurgical and Hydrometallurgical
    PENG Xiao, CHEN Yu-Ming
    2015, 44(03):  92-94. 
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    There are 5.63% copper，2 419 g/t silver and 4.28% sulfur in a Cu-Ag concentrate with particle size of 79.50% -0.077 mm.In order to improve the additional value，reduce transport cost，gain the profits for enterprise，the pyrometallurgical and hydrometallurgical smelting research is conducted on the concentrate.The results show that with industrial salt to sample mass ratio of 1∶20 and chlorination roasting at 850 ℃ for 1.5 h，roasted products were pretreated by 2% dilute sulfuric，and then leached for 60 min by adding 25% ammonia water，with volume equal to 10% sulfuric acid volume.Copper and silver leaching rate of 96.60% and 96.40% was achieved respectively.The smelting method is high efficient in recovering copper and silver from Cu-Ag sulfide concentrate，with characteristics of simple process，high recovery and easy to operation.
    Beneficiation Experiment Research on a Complex and Refractory Silver-Polymetallic Ore in Zhejiang Province
    MAO Yi-Lin, YANG Jin-Zhong, CHEN Xiao-Qing, YAN Wei-Ping, WANG Xiu-Fen
    2015, 44(03):  95-99. 
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    The silver-polymetallic ore in Zhejiang contains 153 g/t silver，0.29% copper，0.83% lead，1.41% zinc.Copper，lead，and zinc exist mainly in form of sulfide.Main valuable minerals，chalcopyrite，galenite，sphalerite，and dalarnite keep closely intergrowth with each other in uneven grain size and irregular shape.In order to high efficiently utilize the ore，beneficiation experiment was carried out based on the process mineralogy.The experiment results indicated that：at the grinding fineness of 91.4% passing 0.045 mm，and by adopting the process of copper-lead bulk flotation with one roughing-four cleaning-one scavenging，rough concentrate through one roughing-two cleaning-two scavenging lead depressing and copper floating，rough tailings through one roughing-four cleaning-two scavenging operation，and middles back to the flow-sheet in turn，copper concentrate with copper grade of 22.47%，silver grade of 1 373 g/t，copper recovery of 69.08%，silver recovery of 8.02%，lead concentrate with lead grade of 40.63%，silver grade of 6 585 g/t，lead recovery of 81.14%，silver recovery of 71.64%，and zinc concentrate with zinc grade of 41.72%，silver grade of 197 g/t，zinc recovery of 79.85%，silver recovery of 3.48% were obtained respectively.This experimental closed circuit process is high efficient in the development and utilization of the ore.
    Beneficiation Research of a Gold Ore from Abroad
    吕Liang , CAO Fei, GUO Zhen-Xu, YUE Tie-Bing, LI Wen-Jun, LIU Lei
    2015, 44(03):  100-103. 
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    A gold ore from a foreign mine contains 7.98 g/t Au，exist in fine，granular and rounded granular gold minerals closely associated with gold-bearing minerals like pyrite and arsenic pyrite.Based on the probe tests，beneficiation research was conducted by applying the process flow-sheet of gravity separation-flotation to realize efficient utilization of the ore.The results indicated that under the proper grinding fineness of 60% -0.074 mm and by an open-circuit separation of a shaking table of one roughing and one cleaning，one roughing，two cleaning and two scavenging，and the middlings returned to the previous operation deal with shaking table tailings，gravity gold concentrate with 450.00 g/t Au and recovery of 17.48% by was obtained，and flotation concentrate containing 54.20 g/t Au and recovery of 76.54% was achieved.Equivalently by the whole process，mixed concentrate will contain 64.80 g/t Au with Au recovery of 94.02%.As can be seen，the combined process of gravity separation-flotation is an appropriate and effective flow-sheet to treat the ore.
    Gold and Antimony Mixed Flotation on a Micrite Gold Antimony ore in Guizhou
    SHI Gui-Ming, ZHOU Yi-Chao
    2015, 44(03):  104-107. 
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    The micrite type antimony-containing gold ore in Guizhou is in blocky construction.Its metallic minerals are mainly pyrite and goethite，with content of less than 1%.Non-metallic minerals are calcite，and few of quartz，organic matter，etc.It contains gold of 6.04 g/t，and natural gold grains were not seen in microscope，74.34% of the gold occurred in sulfide ore，free gold accounted for only 7.14%，wrapped gold in silicate and carbonate accounted for 11.96% and 6.56% respectively.Antimony mainly existed in the form of stibnite.Bulk flotation process was studied to make high efficient recovery of gold and antimony at low costs.The results indicated that，at the grinding fineness of 71% passing 0.074 mm，through one roughing and two scavenging bulk flotation，one roughing and two scavenging bulk flotation after regrinding the tailings to 92.7% passing 0.074 mm，three cleaning flotation for the two mixed rough concentrate，and then middles back to the flow-sheet in turn，rough gold-antimony concentrate with gold grade of 47.60 g/t and recovery of 76.88%，antimony grade of 9.81% and recovery of 85.22% was obtained with good bulk floatation performance.Gold recovery from tailings and separation process of gold and antimony will be further described in another paper.
    Beneficiation on a Scheelite Ore in Xinjiang
    ZHOU Yi-Chao, ZHOU Bin, YAN Fa-Ming, WU Cai-Bin
    2015, 44(03):  108-111. 
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    The scheelite ore in Xinjiang has a complex mineral composition，WO3 content is 0.772% and 95.85% of tungsten exists in form of scheelite，other metallic minerals are mainly galena，sphalerite，pyrite，etc.Scheelite are irregularly distributed in the gangue minerals，most of which are fine，and some are irregular short strips and irregular aggregate.Beneficiation process was studied based on the process mineralogy analysis to realize highly efficient recovery of tungsten.The results indicated that，scheelite concentrate with WO3 grade of 66.38% and recovery of 83.40% was obtained by adopting the process of one roughing and one scavenging to remove sulphide，one roughing and one scavenging for floating scheelite at room temperature，three cleaning for floating scheelite by heating at the grinding fineness of -0.074 mm accounted for 60%.
    Bulk Flotation for Tungsten and Molybdenum Oxide from Molybdenum Sulfide Tailing Containing Gypsum
    CHANG Xue-Yong, ZHANG Yan-Jiao, ZHAO Ping, GUO Zhen-Xu
    2015, 44(03):  112-115. 
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    The grade of Mo and WO3 in a molybdenum sulfide tailing of flotation is 0.093%，0.012% respectively，with fineness of 68.30% -0.074 mm.The molybdenum and tungsten mainly exists in form of minerals oxide，and its liberation degree reaches 85%.Ca2+ dissolved from gypsum，and great deal of slime ruined the recovery of tungsten and molybdenum oxide.Beneficiation experiments were conducted on the on-site tailings of molybdenum sulfide flotation in order to high efficiently recover the tungsten and molybdenum oxide minerals.The results show that using benzohydroxamic acid as collector and lead nitrate as activator，and through the bulk W-Mo flotation process of one roughing-one precleaning-two scavenging at room temperature，bulk flotation concentrate is concentrated to 55% in density and desorption for 45 min at 90 ℃.Then，through one roughing-two cleaning-one scavenging heating cleaning separation，W-Mo rough concentrate with 15.98% Mo and recovery of 51.54%，and 25.54% WO3 and recovery of 63.85% was achieved.
    The Current Situation and Development of Fine Grained Lead-Zinc Ore Flotation Technology in China
    GENG Wei-Li, LUO Tian-Ming, GUO Wen-Jun
    2015, 44(03):  116-119. 
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    Difficulty in trapping microfine lead-zinc ore during flotation is the key problem for low recovery of the fine grained lead-zinc ore.In order to provide technical basis for high efficient recovery of fine lead-zinc ore at a low cost，the process，equipment，and reagents used in fine lead-zinc ore beneficiation were analyzed.Problems and measures existing in recover fine lead-zinc ore were put forward.Suggestions for development direction of fine lead-zinc ore were pointed out.The analysis results show that the high efficient recovery depends mainly on development of new high efficient separation agents，expansion of the beneficiation methods，optimization of the grinding and separation processes，and upsize and efficiency of floatation facilities.On the novel high efficient separation agents，relying on theories of surface and colloid chemistry，quantum chemistry and the computer-aided molecular design technique to develop special reagents which can enhance surface hydrophobicity of superfine lead-zinc minerals would be the research direction.For slime，which has poor flotation behavior，leaching process with low cost，high efficiency，and harmless to environment should be considered，through more separation methods combination to solve the problems of long single flotation process，large investment and high operation costs.For mosaic fine grained lead-zinc ore with easily ground and sliming，the appropriate grinding fineness and classification separation process should be determined，and also stage grinding and stage separation technology should be considered to decrease the overgrinding.About low recovery by using traditional flotation equipment to process fine-superfine lead-zinc minerals，the application and optimization of the high efficient flotation equipment，such as Cyclonic Staticmicro Bubble Flotation Column，should be vigorously promoted.
    Effect of Different Broken Way on Grinding Characteristics of Anshan-type Hematite
    WENG Xing-Yuan, YANG Qi-Fan, LIU Lei, CAO Jin-Cheng
    2015, 44(03):  120-122. 
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    High pressure grinding roll (HPGR) is a new crushing method designed on the laminated grinding.It has characteristics of high crushing efficiency，low energy consumption，more amount of fine grains，and the subsequent micro-crack within the crushed product is benefit for save energy during the followed grinding operation.Taking an Anshan type hematite ore as the sample，experiments on grinding technology efficiency and bond work index of ball mill were conducted in order to quantitatively evaluate the energy saving effect of HPGR crushing on subsequent grinding operation.The results showed that in the coarse grinding fineness range，the grinding technology efficiency of HPGR products was slightly lower than that of the jaw crusher (JC)，which resulted from HPGR products have a slightly higher yield rate of specified size (-0.074 mm).However，the gap decreased as the grinding fineness increases，and the two grinding technology efficiency was quite the same at the grinding fineness of 85% passing 0.074 mm,as the grinding finess getting finer,the grinding technodogy efficiency began to come back slightly.When the target size of 280，150，105，74 μm，the Bond work index of HPGR products lowered by 9.41%，7.70%，4.97% and 4.28% than that of JC，thus the decrease range is lowered with the target size decreased.It is indicated that HPGR crushing has significant energy saving effect on primary grinding operation.
    Geological Characteristics and Ore-Prospecting Vision in Dongqiao Antimony Deposit，Guangxi Province
    YANG Wu, DAI Ta-Gen, CHENG Han
    2015, 44(03):  123-127. 
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    The mine geological characteristics，metallogenic geological conditions and deposit genesis of the Dongqiao antimony deposit are analyzed.Based on this，the mining geophysical and geochemicals anomalies characteristics of the mining area are summarized and interpreted.The results show that：①the surface geochemical scans show that，the Sb，Zn，Cu，As，Pb and Hg anomalies are existed in the mining area.Among these，the ore-forming geological conditions of comprehensive anomaly areaⅡare extremely advantageous，and the wall rock alteration is developed，several veins are found with wide abnormal range and high abnormal intensity.The abnormal morphology of Sb is distributed with circular in EW，with the maximum outliers of 252×10-6，and the average outliers of 37×10-6；②the concentration of the ore-forming elements such as Sb，Zn，Pb，Sn，Cu，Ag matches well with each other.The abnormal intensity of As and Hg are higher，and its abnormal center fit well with the anomaly center of metallogenic elements；③M2 magnetic anomaly distributes with scattered points and beaded form，they constitute near east-west bunch of anomaly，besides that，the M2 magnetic anomaly characteristics are consistent with the mineralization clues that are already found；④the average apparent polarizability of mining area is 2.746%，which shows the presence of sulphide.The ore-prospecting vision of the mining area is analyzed and the Genglongpo prospecting target area is selected based on the above geological，geochemical and geophysical information，which provides the guiding for ore-prospecting in the area.
    Compilation and Geological Implication of the Quantitative Lithofacies Map of Xialei Manganese Deposit，Guangxi Province
    XIE Hua, YI Hai-Sheng, ZHANG Chao, ZHAO Xiang-Ling, LI Yong, LI Qi-Lai
    2015, 44(03):  128-132. 
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    Taking the Xialei manganese deposit in Guangxi province as the research object，the large amount of the drilling data is sorted，analyzed and counted so as to obtain the five types of ore-forming parameters such as the number of seam，cumulative seam thickness，cumulative stone thickness，seam roof thickness，and seam floor thickness.The compilation process of lithofacies map is given in detail，and then，the lithofacies map and ore-forming parameters contour map are compiled.Based on the lithofacies map，the relationship between the characteristics of lithofacies distribution and rock association and the ore-forming process of manganese are analyzed.The results show that，the siliceous rock blocks usually owns the maximum number of seam，cumulative seam thickness，cumulative stone thickness，seam roof thickness and seam floor thickness; Manganese ore is mainly controlled by the siliceous rocks，and the sediment background of manganese ore deposit is controlled by the siliceous rock combination features.Manganese ore is mainly deposited in the environment of deepwater and tranquility.
    Evaluation of Geological Exploration of Mineral Resources Based on Gray-Fuzzy Theory： A Case Study in Central Tibet
    WU An-Bing, GUO Ke, LIU Bing-Li
    2015, 44(03):  133-137. 
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    The goal for comprehensive evaluation of mineral resources is to obtain the information of mineral exploration and the degree of resources security in the evaluation area so as to provide basis for the following work such as improving development efficiency，optimizing the structure of mineral development，conducting evaluation of mine environmental protection and governance.Taking the middle area of Tibet as the research example，the nine advantageous resources such as polymetallic ore，copper ore，molybdenum core，chromite ore are selected as the mine object of evaluation.The 33 geological exploration evaluation units are divided based on analyzing the existing two mineral resources planning of Tibet autonomous region.The evaluation index system for geology exploration of mineral resources is established by considering the four kinds of factors such as degree of work，physical effort，resources and quality characteristics and exploration technology synthetically.The weight values of evaluation index are calculated by using the analytic hierarchy process (AHP) and expert scoring method.The fuzzy comprehensive evaluation is conducted by using the fuzzy comprehensive evaluation model based on grey correlation degree so as to provide some reference for the new mineral resources planning in this research area.
    Three-dimensional Geological Modeling and Reserve Estimation Based on 3DMine Software: Taking a Well Field of Balikun Mining Area，Xinjiang as an Example
    YU Niu-Ben, QI Wen-Tao, WANG Li-Huan, MU He-Ta-尔·Zha-Ri, LI Gang
    2015, 44(03):  138-142. 
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    In order to obtain the information of reserve scope，distribution and development potential of available coal resources，grasp the information of coal resources reserve of mining field productivity construction，plan the mining scheme of mining field，and to provide the reliable guarantee for the sustainable development of coal resources，taking the A1 coal seam of a mining field of Blikun mining area，Xinjiang as the research example，a new three-dimensional geological modeling and reserve estimation method based on 3DMine software is proposed.Firstly，the geological database is established，the ore-body boundary is delimited and the three-dimensional ore-body model is built based on the existing geological information and drilling data；Secondly，the ore-body model is divided into the discrete block combination models，and the ordinary kriging spatial interpolation method is used to estimate coal resources reserve.The research results show that，the samples' information is considered fully during the process of estimating coal resources reserve based on ordinary kriging spatial interpolation method.Compared with the traditional geological block method，the estimating results by the ordinary kriging spatial interpolation method is more reliable；Besides that，the ordinary kriging spatial interpolation method considers the shape and size of coal samples and spatial structural characteristics between coal samples and the variables such as reserves blocks.Therefore，it can provide some reference for mining design and strategic planning.
    Monitoring and Prediction of Mining Subsidence based on D-InSAR and Gray Verhulst Model
    YANG Jun-Kai, FAN Hong-Dong, ZHAO Wei-Ying, FENG Jun
    2015, 44(03):  143-147. 
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    It is not easy to obtain the observation data of mining subsidence of the mining area with complex terrain.In order to solve the problem，a new mining subsidence monitoring and prediction method based on the combination of synthetic aperture radar differential interferometry(D-InSAR) technique and grey Verhulst model is proposed.Firstly，the 12 Terra SAR-X images that covered the experimental areas in the one working face of Daliuta coal mine are processed by using D-InSAR technique to obtain the subsidence values of observation stations.Secondly，the prediction function of grey Verhulst model is established based on the relationship of subsidence value and time to analyze the development law of mining subsidence.The experimental results show that，the absolute and the relative errors of D-InSAR monitoring values for three points are varied from 2.8 to 15 mm，and 0.9% to 6% respectively；The absolute error and relative error in prediction based on the grey Verhulst model Combined with D-InSAR technique are varied from 3.4 to 18.8 mm，and from 1.2% to 5.7% respectively.The experimental results above further indicate that，the method proposed in this paper can effectively make up the inadequacy of the measured data and provide reference for realizing the integration of mining subsidence monitoring and prediction.
    Open Pit Muckpiles Data Management System based on GIS/BDS/GPRS
    BAI Chun-Ni, LU Cai-Wu, GU Qing-Hua
    2015, 44(03):  148-151. 
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    In order to meet the needs of data information management in mine enterprise，the mining production data in Luanchuan Mine is analyzed.It is found that there are such situations in these data as diversity of data sources，large amount of data，and un-synchronized data acquisition.In view of these，a muckpile data management system was presented.This system adopted the geographic information system (GIS) technology，and the general packet radio service (GPRS).Together with the Beidou satellite positioning (BDS) developed by China，the muckpile data were processed by collection，storage，management，display and description.The dynamic monitoring on drivers and vehicles also has been realized.The overall architecture of the system，and its data processing，function realization and system deployment and integrated management capabilities were mainly introduced.The practice approved that this system realized real-time and dynamic visualization of muckpile data.Compared with previous data management system，this system has advantages of easy of use，real-time，data sharing，extensibility and intelligence etc.
    Data Acquisition System for Mine Environment Based on CP1E and Mine Transmitter
    TIAN Zhi-Yong, HUANG Zhong-Hui
    2015, 44(03):  152-155. 
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    The work principle and character of mine environment monitoring system are described．Aiming at the mine environment monitoring,the design thought and realization method of hardware and software for the data acquisition system for mine environment are proposed based on CP1E and related mine transmitter module,and data acquisition system for mine environment is built.The hardware interface connection of intelligent sensor module and CP1E is introduced in detail，and the software design process for the system is given．The hardware and software of this system has strong versatility and stability with a high accuracy grade of data acquisition.The practice shows that the system runs stably and data acquisition in real time by this system is reliable.So it is suitable for complicated mine environment monitor,and has a certain application value in mine environment monitoring.
    The Design Parameters and Application of Foreign Deep-seabed Coring drills Peng Yun，Xia Jianxin，Ren Huatang
    PENG Yun, XIA Jian-Xin, REN Hua-Tang
    2015, 44(03):  156-160. 
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    There are a large number of mineral resources hidden in the sea-floor，and the development of seabed resources is helpful for easing the situation of global resource scarcity.The deep-seabed coring drills are major technical equipment for resource exploration，geological survey in seafloor et al.The designed parameters and features of foreign deep-sea coring drills were summarized; The result of actual application and the development trend of foreign Coring drills were analyzed.From the study，many foreign countries have developed sets of deep-seabed Coring drills，and some of them have been used in sea-floor core drilling，but exist some kinds of technical issues.The drill tool and drilling method have been optimized undergoing a hard time，but there are still some problems that coring rate is not stable and generally low.In order to provide powerful reference for developing and improving the deep-sea coring drills of China，it is necessary to research design technology and development experience of foreign drills.
    Effect of Rod Matrix Arrangement on Pulsating High Gradient Magnetic Separation Performance
    ZENG Jian-Wu, CHEN Lu-Zheng, DING Li, ZHANG Hui-Fen
    2015, 44(03):  161-164. 
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    Beneficiation experiments were conducted on a hematite ore with 38.10% Fe by SLon-100 Cycle Type Pulsating High Gradient Magnetic Separator based on "unit medium" analysis method so as to objectively，comprehensively and accurately understand both the combined rod medium of various diameters and the rod medium of single diameter affecting high gradient magnetic separation.The results indicated that 3+2 mm combined rod medium (upper eight layers withΦ3 mm rod medium,under eight layers withΦ2 mm rod medium) can recover the coarse magnetic particles，and also the fine particles.It can get well recovery index for the whole particles.With the same type of rod matrix，there will a large different separation performance for various arrangements.Thus，the optimum arrangement should be determined by experiments.
    Cooling Experiment on Blind Heading Face of Metal Mine
    WANG Shuang, JIA Min-Tao, CHEN Yi-Hua, WU Leng-Jun
    2015, 44(03):  165-168. 
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    The cooling coefficient in heading face of metal mine is one of the important parameters for calculating the required amount of cooling for tunneling and related to whether to achieve the desired cooling effect and economic investment influencing the cooling engineering.With the aid of the mine deep mining cooling test system，the cooling process in heading face under four conditions of ventilation cooling，cooling by increasing air flow，refrigeration cooling and cooling by increasing refrigeration are simulated，and the cooling effect in heading face is analyzed.After ventilation and cooling by increasing ventilation，the temperature in heading face was dropped first，stabilized，and then kept still.Only the refrigeration measures can lower the temperature in heading face.With the monitoring data，the refrigeration coefficient is calculated out by using the enthalpy difference.At the same time，it is obtained that the refrigeration coefficient ranges at 1.38~1.68 from many experiments.This research provides the design basis for design of cooling in heading face.
    Analysis of Safety Technology Factor of Advanced Mining in Lijiagou Mine Area
    LIU Wu-Tuan, ZHANG Hai-Lei, WANG Cheng-Cai, ZHAO Li-Jun, SUN Jia
    2015, 44(03):  169-172. 
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    Due to be forced to make ore drawing under surrounding rock and large number of waste rock in ore-body，ore grade in Lijiagou Mining Area of Changba Lead-zinc Mine remains at a low level.The ore-body in 902 m level owns a higher grade and is under an intact occurrence state.Advanced mining of the rich ore in this area can effectively enhance the ore-drawing grade of Lijiagou mining area.According to the engineering geology and the ore body occurrence characteristics in 902 m level，the limit exposed area of the stope and structural parameters are optimized by Mathews stability chart method.Based on the disaster mechanism analysis of goaf collapse ripple effect，the synergistic bearing effect catastrophe model of underground excavation rock system is established，and the stability of pillars and roof in advanced mining region is analyzed.Meanwhile，safety measures including goaf subsequent filling and ground surveillance monitoring system are proposed.Practical results show that：the combination of Mathew stability chart method and the finite element software，data's mutual authentication and decision-making can be achieved，which provides security for advanced mining at 902m of middle section in Lijiagou Mining Area.
    Construction of Subsidence Waterlog Calculation Model for Coal Mining in Plain Area and the Effect Analysis:A Case Study of Guangfu River
    HE Qiang, WU Kan, XU Dong
    2015, 44(03):  173-177. 
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    In order to solve the calculation and analysis problems of the waterlog quantity caused by coal mining subsidence in eastern plain,GIS hydrological analysis is innovatively applied to the study of subsidence waterlog to construct the calculation model of water in mining subsidence area.Taking Guangfu River Basin as an example,the catchment area affected by coal mining subsidence of the basin in 2009 and 2015 are respectively calculated as 276.0 km2 and 1 091.4 km2,the affected atmospheric precipitation confluence are respectively 58 000 000 m3 and 229 000 000 m3,and the actual retention are respectively 2 867 000 m3 and 5 562 000 m3.Subsidence water has a large degree of damage to the original natural watershed confluence and water circulation,and the subsidence waterlog calculation model can provide technical support and theoretical guidance for waterlog management and protection of water resources in mining subsidence area.
    Numerical simulation on the Stability of Anti-dip Layered Slope at Open-pit Mine with Faults
    CAO Lan-Zhu, ZHANG Xiu-Ping, WANG Dong, SONG Zi-Ling
    2015, 44(03):  178-182. 
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    During mining process in Pingzhuang west open-pit coal，there exists a serious sliding risk at northwest slope influenced by the F3 fault and weak bedrock layer.To make sure the security of mining-stripping operation，stability researches on northwestern slope were carried out.Based on the strength reduction theory and the rule of D-P，taking transfixion of plastic zone as the slope instability criterion，FLAC3D software was used to make the numerical simulation on the stability of the anti-dip layered slope at northwest F3 fault in Pingzhuang West open-pit coal.From the analysis of different spatial location of fault and slope，and the unstable failure characteristics of slope which did not have fault in northwest，it is indicated that F3 fault has a great effect on slope slippage pattern and stability in northwest.The potential slide pattern of northwest slope was controlled by F3 fault and its location in Pingzhuang West open-pit coal.Landslide was caused by the rock gravity，as the rock slides along F3 fault.Lower rock was squeezed to slide along MD weak layer to the free face，which formed the pushing landslide.Because the existence of fault，landslide was accelerated.The nearer distance of fault from slope surface，the more obvious the effect is.
    Research on Stability of Tailing Pond in Qijiang Iron Mine After Storage capacity Enlarging
    吕Zhi-Tao , JIN Xiao-Guang, LI Ya-Yong, WANG Hong-Ke
    2015, 44(03):  183-186. 
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    Qijiang Iron Mine's tailing pond is selected as an object to study the effect of capacity dilatation and saturation line increase on the stability of tailing pond.Safety factors of the orginal tailing pond and the tailing pond after enlarging capcacity under normal water level and flood level are calculated by using Sweden slicing method.As a result，the safety factor of the present tailing pond under normal water level and flood level are 1.90 and 1.63 respectively，which are all greater than 1.1 that is the minimum safety factor stipulated by the corresponding specifications.The safety factor under flood level decreases by 14.21%，compared to that under normal water level.Safety factor of tailing pond after enlarging capacity under two water levels are 1.27 and 1.17，so the enlarging results in the lower safety factor.It can be seen that the safety factor of tailing pond decreases with the increase of storage capacity and saturation line；however，the volume and radius of the sliding body increase largely.Although the safety factor of the tailing pond after enlarging capacity is still greater than the minimum safety factor，it has little emergency capacity.Thus，it is suggested that the saturation line of the tailing should be controlled after enlarging capacity，and the protective measures and monitoring management should be enhanced to avoid the happen of accidents after enlarging the capacity of tailing pond.
    Recovery of Coke from Blast Furnace Dust by Combined Process of Flotation and Magnetic Separation
    FU Gang-Hua, WANG Hong-Yang, GUO Yu-Feng, LI Peng-Fei, YANG Lu, ZHOU Qi-Kui
    2015, 44(03):  187-190. 
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    In order to high effectively recover and utilize the coke existed in blast furnace dust (BFD)，combined process of flotation and magnetic separation was used to treat a BFD containing 4.43% Zn and 18.45% C.The results show that：①With kerosene dosage of 800 g/t，terpenic oil dosage of 200 g/t and sodium silicate dosage of 1 500 g/t，rough coke concentrate with 74.96% C，1.91% Zn，5.19% Fe and carbon recovery of 90.83% was obtained；②Treating magnetite as carrier，coke concentrate with carbon grade of 85.17% and total recovery of 86.29% can be obtained by grinding the flotation concentrate to 74.32% passing 0.074 mm，and then enduring high intensity magnetic separation with 1.5 T background induction intensity，further more the zinc grade in coke concentrate was reduced to 1.29%.The quality of coke concentrate can meet the requirements of matching ore in sintering.
    Experiment on Flotation Recovery of an Ultra-fine Pyrite from Overflow of Thickener
    CHENG Lan, LI Mao-Lin, HUANG Guang-Yao, SUN Zhao-Shu
    2015, 44(03):  191-193. 
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    Thickener overflow of a lead-zinc flotation tailing contain quantities of ultra-fine pyrite with particle size of 99.40% passing 40 μm and 33.50% passing 5 μm.Most of pyrite particles are finer than 30 μm，exists in form of idiomorphism or semidiomorphism granular with sound liberation degree.94.93% of pyrite are monomer and enriched in 40~5 μm grade.To increase the utilization rate of resource，improve the business performance of enterprises，decrease the tailings stockpiling and discharging，and optimize the parameters of tailing pond，flotation experiments of the ultra-fine pyrite were carried out.The results showed that sulfur concentrate with sulfur grade of 46.90% and recovery of 86.64% was obtained through the process of two roughing-two cleaning，and middles back to the flow-sheet in turn.With good flotation index，the process can be as the basis for design.
    Development of Early Strength Filling Cementing Material with Phosphogypsum as Substitute of Traditional Cement
    ZHANG Guang-Cun, YANG Zhi-Qiang, GAO Qian, WANG You-Tuan
    2015, 44(03):  194-198. 
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    There are large amount of phosphogypsum piled around Jinchuan Mine as waste rock，meanwhile the mining process of Jinchuan Mine have massive demand on cementing materials for backfilling.Early cementing materials are developed using phosphogypsum as main material，in order to reduce filling costs and convert the waste into valuable resources and improve mine environments.With the help of Scanning Electron Microscope (SEM)，the hydration mechanism of 3 d cementing materials based on phosphogypsum was analyzed.The experiment results indicated that，with the mass ratio of 4%，2%，30%,1.5%，early compressive strength of cementing material is 3.46，5.57，9.56 MPa respectively，higher than that of designed requirements.SEM analysis showed that the hydrated calcium silicate gel and ettringite play a decisive role in improving the strength of filling body，through hydration reaction of the cementing material based on phosphogypsum.Early strength cementing material made from phosphogypsum can replace the current 32.5# cement.
    Technical Status of Foam Insulation Material of External Wall and its Preparation with Sandstone Coal Gangue
    XING Jun, LI Xiao-Qing, SUN Xiao-Gang, QIU Jing-Ping
    2015, 44(03):  199-200. 
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    Under the background of external wall thermal insulation materials innovation upgrading and coal gangue resource utilization，as industrial solid wastes，sandstone coal gangue and polishing tile waste are used to develop the external wall insulation foam material，which can achieve construction energy-efficient and fire safety，improve the ecological environment of mining area，and reduce the waste of valuable land resources.Based on the introduction of China's status of external wall insulation materials industry and research on coal gangue external wall foam insulation material，the plasticity and foaming of the tested material were analyzed，and the coal gangue exterior wall foam insulation material was prepared.The results show that，coal gangue exterior wall foam insulation material with a certain appearance and property can be produced through the aging，molding，and sintering process，with sandstone coal gangue in Chaoyang City and polished tile waste in Faku County as the main raw material，SiC and MgO as the composite pore forming agent，borax as the fluxing agent.To reduce the costs at an accept range and meet the construction industry requirements，optimization tests on raw material proportioning and sintering system are needed.Therefore，the test technical route is feasible