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    13 May 2016, Volume 45 Issue 05
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    Study on Mining Methods for Steeply Inclined Medium Thickness Ore Body
    ZHANG Wen-Fang, WANG Wen-Li
    2016, 45(05):  1-5. 
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    The Shangmian valley silicon mine with steeply inclined thick silica ore is chosen as the test base.Difficulties in exploration of mine silica ore are summarized through the study of geological structure，physical and mechanical properties and original mining scheme of mine.For the mining conditions in silica mine such as easy fragile，poor stability of ore roof and floor，the pillarless sublevel caving method is put forward.At the same time，a scheme that ores are remained at ore chute is proposed to reduce the secondary impact wear of ore.The production test of mine proved that the scheme was suitable for stoping of steeply inclined thick silica ore with good effect.
    Simulate Optimization of Blasting Scheme in Gongchangling Open-pit Iron Mine
    DENG Peng-Hong, WANG Hai-Long, SUN Yun-Feng
    2016, 45(05):  6-10. 
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    In order to reduce the effect of blasting during the production on surrounding environments as much as possible and control the negative effect of blast vibration，the method of fixed-point observation was used to monitor the production and blasting in the area between explosion and Hejia village.Based on the site monitoring data，the blasting process e in the mining area was dynamically simulated by the numerical software（ANSYS/LS-DYNA) to represent the blasting situation in the blasting area.Meanwhile，the vibration velocity near the houses under different bench explosion schemes was predicted，obtaining that the maximum speed of blasting particle in the vertical direction was 3.64 mm/s and 5.82 mm/s respectively.Taking the value lower than that in the Safety regulations for blasting practices as a basis，and through contrasting and analysis，schemes of the bench explosion in the mining area were optimized and the maximum number of blast holes at the same level increased to 2 was determined as the reasonable bench explosion scheme.All these provide the references for controlling vibration strength in blasting.
    Ground Pressure Distribution and Control of the Stope Based on Combined Mining in Chengchao Iron Mine
    ZHANG Kai-Xin, WANG Ping, PEI Ming-Song, JIAO Ao, WANG Chuang, SHANG Huan-Di
    2016, 45(05):  11-14. 
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    With the combined mining of two methods for exploiting ore-body at -430 ~ -500 m stage of Chengchao Iron Mine as the engineering background，the pressure distribution and mining field stability problems of the stope under the combined mining method are explored.The excavation process of the ore body was simulated by numerical analysis software FLAC3D based on the finite difference theory.According to the simulation results，the stresses variation and safety factor of the stope before and after excavation and isolation pillar deformation were obtained.The control measures of underground pressure and the corresponding management system was provided as well based on the analysis results.
    Optimization of Stable Transition Program during Deep Mining Expansion of Qidashan Iron Mine
    ZHAO Jin-Xian, SUN Jing-Han, FAN Ke, LI Chuan-Lin, WANG Yong-Zeng
    2016, 45(05):  15-18. 
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    The deep open-pit mining project of the Qidashan Iron Mines is in the process of transition from the first phase to the second phase.However，the transition started late，it’s quite difficult to achieve stable transition.According to the current situation of mining and the distribution of the mine rock within the scope of the second phase，a geological model corresponding to the mine’s reality was established.With the use of the optimized production technology parameters，the practical situation of the hysteretic transition and the productivity of existing developing transport system were analyzed.Contrasting to the primary design of the stable transition to the second phase of deep open-pit mining project and based on the geological model built，three different stripping schedule programs and suggestions of development transport system were drawn up，and the reasonable depth of the stable transition was presented.Through analyzing the technical feasibility，an efficient and feasible production expansion of stable transition plan and a proposal of the mine production were determined.
    Comprehensive Evaluation of Rockburst on Deep and Large-scale Mining in Dahongshan Iron Mine
    HUANG Bo, LI Shu-Lin, GAO Zhen-Ping, HU Jing-Yun, WU Xi-Huang, XU Gang
    2016, 45(05):  19-25. 
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    Dahongshan iron mine is oversize and deep-buried deposit，and a technical problem that must be faced in deep mining is rockburst.To evaluate the intensity of rockburst proneness，indoor rockburst pronenss experiments of five kinds of rock samples from deep mine are recorded，and acoustic emission is used to control the unloading point near to peak strength of rock；According to the ground stress measured in field and result of three-dimensional finite element numerical analog，maximum primary stress in deep mine and tangential stress values after tunnel excavation are obtained.Five judging methods of maximum primary stress criterion，tangential stress criterion，strength brittleness coefficient method，deformation brittleness coefficient method and elastic strain energy storage index method are used to make an estimation of one index about rockburst proneness，and rockburst proneness intensity of rocks in Dahongshan iron mine is obtained；Then，the method of fuzzy mathematics is used to make an integrated evaluation.The result shows that there is medium and strong rockburst proneness of main rocks in deep mining.At last，distribution map of rockburst proneness in typical level is plotted according to the evaluation result，which provides reference for mining and rockburst control in deep mining.
    Study on Creep Test of Cemented Tailings Backfill and Statistical Damage Model
    ZHAO Shu-Guo, SU Dong-Liang, ZHANG Ya-Lun, WU Wen-Rui
    2016, 45(05):  26-30. 
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    In order to study the creep mechanical characteristics of backfill，a step loading uniaxial compression creep test was carried out with RLW-3000 shear creep testing machine controlled by computer.The result showed that the higher the load，the faster the deformation and the deformation rate of backfill.The pressure and extension of internal defects and weak surface of backfill，show the creep deformation of backfill on the macro level.Assuming that there exists a relationship between the failure probability of backfill micro-element and axial strain，and the failure obeys the Weibull distribution.Combined with the uniaxial compression test，the damage variable of the backfill damage evolution process can be described.And the damage variable is introduced into the Burgers model；the statistical damage constitutive model is established.MATLAB software was used to fit the creep test data of backfill，and the model parameters were determined.The results showed that，the model curves tallies with the experimental curves.The higher the stress level is，the higher the accuracy of the fitting results is，and this model can be used to describe the creep behavior of backfill.
    Variation Law of Water Level Around the Grouting Curtain in Zhongguan Iron Mine
    XIA Dong, YUAN Xue-Tao, CHANG Hong
    2016, 45(05):  31-35. 
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    The Zhongguan iron ore is an Ordovician limestone karst mine which was eroded by water.And it has been threatened by serious flood during mine construction period.On the basis of detailed analysis of the character of the aquifer of the mining area，the law of water content change and the characteristics of groundwater movement，this study has analyzed the Zhongguan iron ore′s law of water level variation around the water blocking curtain and control strategy of water bursting in mine.It turns out that：the dynamic changes of groundwater around the curtain are not only affected by regional groundwater flow conditions and season alternating，but also by the curtain itself and mine tunnel construction inside the curtain region and sewer drainage.According to the macro understanding of mine hydrogeological conditions and law of water level variation around the water inrush，detecting water by pilot hole，construction of water storage sump，super stages drainage in mine and of groundwater level and continuous observation of mine water inflow of outburst mine and other control strategies of water bursting in mine during mine construction period have been put forward in this paper.
    Stability Analysis of Deep Buried Tunnel based on Ubiquitous-joint Model
    ZHAO Yong, YANG Tian-Hong
    2016, 45(05):  36-41. 
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    In order to investigate the influence of different joint angles on the tunnel stability in deep mining process，a tunnel model with different joint angles was established，and the analysis of tunnel stability based on the ubiquitous-joint constitutive model was carried out.The stability analysis index，which served as a basis for evaluating the influence of tunnel stability，was defined in terms of stress，displacement and plastic zone.It was found that with the change of joint angle，the roof sag and the floor heave of the tunnel were both decreased，while the change of wall convergence was small.The stress concentration increased with the increasing joint angle，and the concentrated area was focused on the tunnel，besides the size of the concentrated area was decreased.The plastic zone distribution around the tunnel was orthogonal to the joint and the range was obviously influenced by joint angle.Firstly，the plastic zone distribution was gathered in the roof，and then transferred to two sides with the increasing joint angle，and the range was obviously influenced by joint angle.Therefore，in the process of deep tunnel support，the influence of anisotropy should be taken into consideration.
    GIS-based Approach of Rock Slope′s Stability Assessment under Multiple Factors
    SUN Shi-Guo, SU Zhen-Hua, ZHANG Ying-Hai
    2016, 45(05):  42-47. 
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    Evaluating the stability of mining slope can implement the spatial prediction of slope failures and avoid loss of life and property,Taking 12 influence factors of slope stability into consideration，such as formation lithology，geological structure，weathering and alteration，inclination，exposure，terrain curvature，hydrogeological condition，surface runoff，existing large project，road engineering，vegetation cover and temperature differences，the three kinds of weights (the fuzzy-floor，the most likely value and the fuzzy-ceiling) of each factor are calculated by the improved fuzzy analytic hierarchy processThe geographic database of one mine is built based on ArcGis，and combining with the geological exploration，the spatial analysis module of ArcGis are used to stack the weighted raster layer of various factorsThe overall stability of the research area is evaluated，and different kinds of slope instability have been evaluated by adjusting fuzzy weightThe results show that the southeast and northwest corner in research area is stable，and the unstable area is distributed over the mining area and the bad geological areaHeavy rain and earthquake prediction should be jointly considered to prevent different kinds of instability of landslide，and the reasonable mining method should be chosenIt provides a new thought for evaluating slope stability
    Establishment of Backfill′s Damage Constitutive Model and Its Strength Determination
    QIU Jing-Ping, YANG Lei, XING Jun, SUN Xiao-Gang, WANG Qiang
    2016, 45(05):  48-51. 
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    Zhongguan Iron Mine is expected to adopt the stage open stoping with subsequent filling，in which the reasonable determining of backfill strength is one of the key.Since various problems occur in the traditional method to determine filling strength，it′s necessary to explore a more scientific approach to seek for reasonable match between backfill strength and rock mass.Laboratory mechanics tests on tailing cemented backfill in Zhongguan Iron Mine were carried out，obtaining the stress-strain curves.Based on this，the damage constitutive models of the backfill body before peak stress were established by using the damage mechanics.According to the principle that the peak deformation energy of backfill should be corresponded to releasing energy from excavated rock mass，the optimum backfill strength and ratio of Zhongguan Iron Mine were determined as 1.86 MPa and 1∶6 respectively，which plays a significant role in baclfill mining production on site.
    Electronic Structure and Hydroxylation of SnO2 Surface Studied by First-principles Calculation
    TAN Xin, HE Fa-Yu, QIAN Zhi-Bo, FU Ya-Feng
    2016, 45(05):  52-56. 
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    Based on the Density Functional Theory（DFT)，the electronic structure and surface energy of {100}，{110}，{101} cleavage surfaces of cassiterite were investigated by First-principles calculation with Materials Studio(MS) 7.0，and the adsorption of hydroxyl ions onto {100} surface was also researched.The calculated results showed that，compared with {101} surface，{100} and {101} surface which were the most common exposed surfaces for cassiterite，owned lower surface energies.The hydroxyl ions adsorption on cassiterite surface mainly attributed to the negative charged oxygen atoms bonding with the five folds Sn atoms in mineral surface.The 5 fold tin atoms which owned danging bonds was the active center of surface.The calculation results provide a fundamental theoretical basis for the further development of new cassiterite collectors.
    Flotation Performance and Mechanism of the New Type Copper Sulphide Collector PZO
    WANG Tai, HU Zhen, TANG Yu-He, LI Han-Wen
    2016, 45(05):  57-60. 
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    PZO is a new type of copper sulphide flotation collector which was invented by Guangzhou Research Institute of Non-ferrous Metals.In order to examine selectivity of PZO on chalcopyrite and pyrite separation，PZO，butyl xanthate and butyl ammonium aerofloat effect on single mineral flotation of chalcopyrite and pyrite were compared separately under the condition of different pulp pH value and dosage.Meanwhile，PZO in chalcopyrite and pyrite surface adsorption amount and mechanism were studied with UV-VIS spectrophotometer and infrared spectrometer.The results showed that，①In the test pH range，butyl xanthate and butyl ammonium aerofloat and PZO floatobility ability are stronger than the pyrite of chalcopyrite.②The influence of slurry pH value on chalcopyrite floatobility ability are smaller，and the high recovery rate of chalcopyrite among weak acid or alkaline conditions，the flotability of pyrite in acidic conditions is stronger than the alkali conditions.③Collector′s selective ability from stronger weaker are PZO>ammonium butyl aerofloat > butyl xanthate，When pH=8.5 chalcopyrite and pyrite recovery rate difference value can reach 68.19 percentage points.④PZO is an ester of flotation reagent，compared with pyrite，more easily adsorpted on chalcopyrite surface，and mainly belongs to chemisorption.The abrove results show that，under slurry pH 8.5 PZO can efficiently separate chalcopyrite and pyrite.
    Research on Collecting Property of Fine Cassiterite by a New Anion Collector DMY-1
    LI 二Lei, NIE Qiao-Qiao, MIAO Mei-Yun, ZHU Yi-Min
    2016, 45(05):  61-63. 
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    College of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China A new anionic collector named DMY-1 was developed by Northeastern University to achieve a high recovery efficiently of fine cassiterite.In order to inspect the collecting performance，one flotation operation was carried out by utilizing fine pure cassiterite with mean volume diameter of 1771 μm as sample.The Zeta potential measurement and infrared spectrum analysis was conducted on the single cassiterite ore both before and after interaction with DMY-1，Recovery of 9450% was acquired at the optimum condition of pulp temperature 18 ℃，pH=9，the DMY-1 dosage of 200 mg/L，besides，good index can be obtained by using DMY-1 at various temperatures.There are hydrogen bond and chemical adsorption between DMY-1 and cassiterite surface.
    Experiment of Direct Flotation on a Bauxite Ore Using EM505 as New Collector
    YAN Wu, LIU Neng-Yun, CHEN Da, ZHAO Kai-Le, XIONG Shu-Qing
    2016, 45(05):  64-67. 
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    A bauxite ore in Chongqing is mainly composed by the sedimentary type diaspore，boehmite and gibbsite，silicon to aluminum ratio is 5.19.Direct-flotation test were conducted by Institute of Multipurpose Utilization of Mineral Resources，Chinese Academy of Geological Sciences using self developed collector EM505 with grinding fineness of 75% -0.074 mm，via two roughing and three cleaning，rough concentration tailing and cleaning tailings mixed and via one scavenging and one cleaning process，concentrate with Al2O3 grade of 68.86%，SiO2 grade of 6.79% and with the recovery of Al2O3 83.39%，and silicon to aluminum ratio of 10.14 was obtained，which can be used in production of Bayer method.Synchronous flotation of both coarse and fine particles was achieved by using the collector EM505.At the same time，the flotation concentrate bubble is brittle，small and fast speed of merger and mineralization by use this collector，especially not sticky，so the collector EM505 is a high efficient collector for direct-flotation on bauxite.
    Beneficiation Experiment on a Complex Sliver-lead-zinc Polymetallic Ore in Zhejiang Province
    XIA Qing, LIANG Jing-Jing, 欧Yang-Hui
    2016, 45(05):  68-72. 
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    The sliver-lead-zinc polymetallic ore in Zhejiang contains 1.10% lead，3.70% zinc，84.50 g/t sliver.Lead and zinc are mainly exists in form of lead sulfide and zinc sulfide which have high value of development and utilization.In order to recover the valuable elements in ore adequately，preferential flotation flowsheet was adopted in mineral processing experiments.The results indicated that via the closed-circuit process of one roughing-three cleaning-two scavenging select lead，one roughing-two cleaning-one scavenging select zinc，one roughing-one cleaning select sulphur，lead concentrate with lead grade of 46.40%,recovery of 81.02%,sliver grade of 3 300.00 g/t，recovery of 75.17%，zinc concentrate with zinc grade of 4800%,recovery of 88.17% and sulphur concentrate with sulphur grade of 36.70%,recovery of 50.98% were obtained eventually.Full recovery of valuable minerals in ore was achieved.
    Flotation Test of a Cu-Zn Ore from Guizhou
    DI Yong-Ning, CHEN Li-Rong
    2016, 45(05):  73-76. 
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    In order to provide technical basis for development and utilization of a sulfide copper-zinc ore in Guizhou Province，copper and zinc flotation test by copper preferential flotation and then zinc flotation process was conducted based on the process mineralogy of the ore.The results showed that，with 1.75% copper and 1.54% zinc of the raw ore，by the process of one roughing-two cleaning-one scavenging closed circuit of copper flotation，one roughing-one cleaning-one scavenging closed circuit of zinc flotation，final copper concentrate with copper grade of 21.42% and recovery of 89.13%，and zinc concentrate with zinc grade of 41.70% and recovery of 72.15% were obtained.
    Iron Removal from Simulated Acid Leaching Solution of Manganese Carbonate Ore
    ZHU Bao-Hua, SUN Lian-Zheng, ZHANG Ya-Hui, LI Hong-Chao, ZHANG Hong-Xin
    2016, 45(05):  77-80. 
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    In order to investigate the possibility of removing iron by phosphate on acid leaching solution of manganese carbonate ore，and explore the effects of recycling phosphate anions by NaOH in the processes of the generated FePO4 residue，the condition experiments of removing iron and recycle phosphate anions in the simulated solution obtained from acid leaching of manganese carbonate ore of Mn2+，Fe2+ concentrations were 18.04，5.20 g/L were conducted.The results show that the theoretical amount of H2O2，pH=1.8，sodium phosphate dosage of 1.7 times theoretical amount，reaction time to be 15 minutes at room temperature，the removal rates of Fe2+ is 99.85% and the loss rates of Mn2+ is only 2.23%.Under the optimal conditions that sodium hydroxide to be 0.75 times of the theoretical amount and response time of 3 hours，recovery of PO3-4 is 98.24%.Therefore，the processing of removing iron by phosphate on acid leaching of manganese carbonate ore is not only feasible，but also at a low price because of the high recovery of PO3-4.
    Changes Characteristics of Extracellular Polysaccharide in Leaching Bacteria under As(Ⅲ) and As（Ⅴ) Stress
    FU Yao, GAO Lu, YANG Hong-Ying, TONG Lin-Lin, YANG Yu, HU Xiao-Jing
    2016, 45(05):  81-84. 
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    The behavior changing of extracellular polysaccharide in leaching bacteria was studied under the different concentrations of As(Ⅲ) and As(Ⅴ) stress，in order to investigate the relationship between extracellular polysaccharide in leaching bacteria，concentration and valence of arsenic ion，and increase indexes of leaching bacteria，so as to find out biological strategies of leaching bacteria against arsenic ion.The pH，Eh，Fe2+ concentration，the number of bacteria and the content of extracellular polysaccharide were measured to analysis the correlation and the linear relationship between them.The results show that under As(Ⅲ) stress，the production of extracellular polysaccharide in the bacterial liquid increases over 34%，As(Ⅲ) stress effect is stronger than As(Ⅴ)，and the extracellular polysaccharide content is linear correlation with Eh，Fe2+ concentration and the number of bacteria at level of 63.4%，61.6% and 71.4% respectively.The results also indicate that leaching bacteria can regulate and control the growth indexes of the bacterial liquid to adjust the amount of extracellular polysaccharide，thus to resist arsenic ion stress.
    Characteristics of Process Mineralogy of U-Nb-Pb Polymetallic Ore in Huayangchuan，Shaanxi Province
    HUI Xiao-Chao, HE Sheng
    2016, 45(05):  85-90. 
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    Huayangchuan U-Nb-Pb polymetallic deposit of Shaanxi Province belongs to large mineral deposit with properties of large volume mineral，variety types of minerals，and it is exploitable.In order to provide technique basis on mineral processing technology，systematic studies on technological mineralogy of typical ores have been carried out.The conclusions have been reached as follows:①main valuable minerals include betafite，galena，follows by monazite，allanite，magnetite，barite-celestite and zircon.②88.03% of UO2 occurred in the betafite ore，and the rest of UO2 occurred in monazite，allanite，apatite，sphene by forms of isomorphism or adsorption.95.22% of Nb2O5 occurred in the betafite ore，the rest occurred in allanite，apatite and sphene in forms of isomorphism or adsorption.89.00% of Pb occurred in the galena ore，the rest of Pb mainly occurred in cerussite.③The textures of ores are mainly automorphic-hypautomorpuic granular texture，including texture，parcel structure，zonal texture，dissolution texture，mosaic texture and metasomatic texture.Structures of ores are mainly thin veins structure，veinlet structure，disseminated structure，and spot-like structure.④Automorphic-hypautomorpuic granular betafites with granularity from 0.15 to 1.5 mm intruded into the fractures of calcite and plagioclase with occurring of allanite and apatite.Betafite.Automorphic-hypautomorpuic granular galena with granularity from 0.3 to 1.2 mm occurred in calcite and plagioclase.Allanite，monazite，apatite with different grain sizes usually present at same place in the fractures of gangue minerals.The proposed process of stage grinding stage separation is recommended for significant difference of ores minerals grain sizes.
    Mineralogical Characteristics Features of an Ilmenite Ore
    WANG Li-Zhen, LIU Yang, CAO Jia-Hong, ZHONG Biao, QU Si-Si, JIANG Chu-Ling
    2016, 45(05):  91-94. 
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    The main mineralogical characteristics which may affect the beneficiation indexes of ilmenite were clarified through the analyses on the composition，texture，structure of the ore，the occurrence and alteration types of the ilmenite，the energy dispersive spectrum and disseminated grain size of the ilmenite.Factors influence the separation performance of the ilmenite was also analyzed.The results show that the titanium elements dispersively distributed in the ore，and the ilmenite was generally scattered in the gangue.The titanomagnetite was distributed along the edge of ilmenite in some area of the ore，and the rutile，hematitization，and sphene were observed along the surface，edge，inter-granular and the crack of the ilmenite.The grain size of the ilmenite was relatively small.Due to the oxidization，partial ilmenite was embedded intricately with sphene，this would influence the product quality of the titanium ore concentrate.The ilmenite ore could not be fully disassociated even if under fine milling procedure.Research results provide references and suggestions for the mineral processing technology of the ilmenite ore.
    Study on the Mineralogy Properties of Iron Ore from Gansu Province
    QIU Jun, WANG Zhou-Quan, WU Peng, LI Feng-Lei, ZHANG Lei, 吕Xian-Jun
    2016, 45(05):  95-98. 
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    In order to effectively provide guide for beneficiation tests on an iron ore in Gansu，process mineralogy of the sample was studied.The results showed that:①iron ore with iron grade of 37.89% is semi self-fluxing low sulfur magnetite ore.The useful mineral is magnetite，among which magnetic iron account for 79.31% of total iron.②The ore is mostly constructed by block structures，then disseminated and banded structures.The main structure forms of the ore are xenomorphic and hypidiomorphic granular texture and containing structure.③The magnetite dissemination with particle size between 0.2 mm and 0.045 mm accounting for 65% is divided by quartz and hornblende，while 20% with particles size between 0.025 mm and 0.045 mm is distributed in gangue minerals，disseminated with sparse and dense，about 10% between 0.01 mm and 0.025 mm and 5% under 0.01 mm.Therefore，the process of dry pre-magnetic separation-stage milling and grinding-stage low intensity magnetic separation is recommended.On the basis of recovery early and reducing excessive grinding，the recovery of magnetite with particle size under 0.025 mm should be strengthened to ensure the recovery rate of magnetite.
    Research Progress on Flotation Reagents for Separation between Scheelite and Calcium Gangue Minerals at Room Temperature
    YAN Qun, WANG Jin-Qing, FENG Bo, LI Tao, LUO Xian-Ping
    2016, 45(05):  99-105. 
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    Flotation separation of scheelite from calcium gangue minerals was one of the difficulties in mineral processing industry.The perspective of solution chemistry indicated that transformation of mineral surface changed chemical composition，surface electrical and floatability of minerals，which is the main reason for difficulty in flotation separation of scheelite from fluorite and calcite.The regular flotation collectors and depressors of scheelite were summarized；the types，properties and action mechanism of new type of efficient collectors and depressors for flotation separation between scheelite and calcium gangue minerals at room temperature were introduced.Moreover，the advantage of combined collector and combined depressor in the process of flotation practice of scheelite was illustrated.It is pointed out that efficient collectors and depressors will be the research direction in the future.
    Present Situation and Prospect of Beneficiation Technology of Copper Oxide Ore
    WANG Peng-Cheng, CHEN Zhi-Yong, CAO Zhi-Ming, LUO Xian-Ping
    2016, 45(05):  106-112. 
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    Characteristics and properties of oxidized copper ore resources were summarized.Also the present situation of research on mineral processing technology was respectively introduced from three aspects of flotation process，chemical leaching process and combined dressing-metallurgy technology.The research status of flotation process is described in detail from aspects of direct flotation，flotation of sulfide，hydro-thermal sulfide flotation，finely particles of vacuum micro bubble flotation，desliming flotation and others.The chemical leaching process (including two aspects of acid leaching and ammonia leaching) is introduced，pointing out that the research in conventional flotation and leaching processes set their advantages in smelt joint processes,and new technology of copper oxide ore by microbiological leaching，roasting ammonia leaching and separation flotation etc.were presents.In the end，it is pointed out that the technological level of mineral processing technology of oxidized copper ore must be carefully studied；the research and development of new drugs should be strengthened to realize high efficiency flotation.In determining the ore treatment process，the optimal combination with various processing methods based on fully recognizing the advantages and disadvantages of those processing methods can achieve the complementary advantages of each beneficiation methods.
    Determination of Lithium Oxide in Spodumene by Inductively Coupled Plasma-atomic Emission Spectrometry
    XU Xiu-Ping, LI Bo, HUA Shao-Guang
    2016, 45(05):  113-117. 
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    A new method is described for the determination of lithium oxide in spodumene by Inductively Coupled Plasma-Atomic emission spectrometry sample by HCl-HNO3-HF-HClO4 mixed acids dissolved the sample. Lithium analytical spectral lines is 610362 nm for the test，observation method is radial observation，high frequency power is 11 kW，atomizing gas flow rate was 10 L/min，the peristaltic pump speed is 15 mL/min for lithium detectionSample solution medium is hydrochloric acid for concentration of 3%.When lithium oxide concentration is 0~50 mg/L，linear correlation coefficient of the concentration of lithium - spectral line intensity curve is 0999 7；Lithium content detection limit is 0007 mg/L，relative standard deviation (RSD) is 081%.The method has the advantages of lower detection limit，high sensitivity，less disturbance，good accuracy，wide linear range and easy operating.The method is suitable for accurate determination on routine analysis of lithium oxide in spodumene
    Geological Characteristics and Mineralization Model of the Volcanic Type Gold Deposits in Wangjiachong-Langlingwan Area
    WANG Xi-Rong, PAN Jia-Yong, LI Shao-Xia
    2016, 45(05):  118-124. 
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    In order to obtain the distribution situations,geochemical characteristics of the ore-body occurrence position,each deposits genetic types and its intrinsic relationships of the gold resources that is developed in the south broken altered fracture zone of Mozitan-Xiaotian volcanic basin,combing with the large number of geological exploration data and the technical methods of geological mapping,profile survey,systematic sampling,isotope samples collection and analysis and inclusion thermometry,the geological characteristics of the ore-bodies,ore-forming material source,ore-forming temperature and pressure conditions and metallogenic model of the gold resources in Wangjiachong-Langlingwang area are analyzed in detail,the results show that:①the contents of 34S of pyrite is -1.8‰～+2‰,it has the deep source characteristics of sulfur of lower crust or upper mantle,the composition characteristics of Pb isotope indicated that the most of the Pb is belongs to the deep source normal Pb；the ore-forming fluid is characterized by magmatic water mixed with a large number of meteoric water,the main homogenization temperature of quartz inclusions is 100～150 ℃,the explosion temperature is 300～350 ℃；the gold deposit is belongs to the middle-low temperature volcanic hydrothermal type gold deposits.②the metallogenic model of gold deposit is the initial formation of primary source bed,early preliminary enrichment of gold,along with the deep magmatic instrusion and eruption of the mesozoic Yanshan epoch,the remobilization,migration and enrichment of gold,the different mineralization types of gold deposit is formed ultimately.The above analysis results have some reference for the study of metallogenic conditions and ore deposit genesis,the establishment of metallogenic prediction model and deep gold deposit prospecting work.
    Single Engineering Ore-body Delineation Method Based on Three-dimensional Drillhole Model
    JING Yong-Bin, SUN Guang-Zhong, ZHANG Rui-Lin
    2016, 45(05):  125-129. 
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    In order to delineate the ore-body in the three-dimensional visualization environment to establish the three-dimensional model of ore-body,the method of automatic delineation method of the single engineering ore-body is analyzed.According to the data of drillhole,samples analysis,survey and geological lithology,the three-dimensional drillhole model is establihsed by caculating the drillhole spatial trajectory and drillhole attribute data.Based on the three-dimensional drillhole model,according to the industrial indexes of deposit (including cutoff grade,minimum mining thickness,rock eliminating thickness,minimum industrial grade,minimum meter percent,et al),the drillhole samples of three-dimensional space are composited,the grade of composite sampels grade are calculated by the length of the drillhole samples or the weighted average values of the product of samples length and specfic gravity.The vector of thickness direction is calculated by the dip direction and dip angle of ore-body,the vectors of each ore-bodies are calculated based on the spatial trajectory of the three-dimensional drillhole model.The true thickness of ore-body is proposed by the vector that is obtained by projecting the vector of each ore-bodies to the thickness direction.The ore-body delineation methods based on the single index of cuttoff grade and the two indexes of cuttoff grade and minimum industrial grade are implemented.The ore-body delineation methods proposed in this papaer is tested by the drillhole data of a copper mine in Yunnan province,the results show that the ore-bodies can be delineated effectively based on the given industrial indexes by adopting the single engineering ore-body delineation method,therefore,the ore-body delineation method proposed in this paper is good for improving the precise and working efficiency of ore-body delineation.
    An Innovation for Improving the Ability of High-pressure Water Jet Cutting Nozzle
    CUI Zhi-Li, JING Lai-Wang
    2016, 45(05):  130-134. 
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    In order to improve the turbulence state of high-pressure water jet nozzle and to advance its cutting ability，flow conditioner was creatively proposed to improve the performance of jet.The flow conditioner with four kinds of profile types（cross，guide，square，flat) were designed and manufactured by adopting OMAX water cutting，which were respectively installed into the nozzle.Their performances were studied by experiments of flow coefficient，convergency and cutting.The function of the flow conditioner was discussed and the expression formula of cutting depth by water jet at fixed point was derived.Except for the lower flow coefficient，the performance of nozzle with a flow conditioner was evidently better than that without one，especially that its cutting ability have a greater improvement in the submerged area.For four kinds of flow conditioner，the cross type was the best，followed by guide，square，flat.
    Development and Application of Deep Hole In-situ Direct Shear Test Apparatus
    PENG Kai-Bei, JIA Rui-Qing
    2016, 45(05):  135-138. 
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    In-situ direct shear test is an effective method for obtaining the strength parameters.After investigating a set of direct shear apparatus for lab test，a deep hole in-situ direct shear test apparatus was developed，and the structure，working principle and technical advantages of the apparatus are introduced.This device can test shear strength of soft soil and fine sand in deep earth.That the device is directly inserted into the soil by the test cup for sampling can minimize the disturbance of the soil sample.The test cup is equipped with a high precision sensor，which can be used to determine the stress parameters of the soil by means of the vertical and horizontal loading of the soil through the stress sensor.The device is small in size and portable and can automatically achieve data collection.So，it is suitable for the scene with complex environment.The shear strength parameters of sands obtained by this device are approaching to that of the indoor direct shear test.The final results show that the deep hole in-situ direct shear test apparatus can be used to test shear strength of fine sand and soft soil.
    Comprehensive Evaluation Method for Truck Dispatching System in Open-pit Mine
    SUN Xiao-Yu, ZHAO Song-Song
    2016, 45(05):  139-143. 
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    In view of the difficulty in quantifying the factors index and making comprehensive evaluation of truck dispatching system in open pit mine，the comprehensive evaluation method based on analytic hierarchy process and fuzzy evaluation is put forward.First，on the basis of the principle of analysis hierarchy process（AHP)，factors that influence the truck dispatching system are analyzed，and the truck dispatching system process is divided into 3 layers of target layer，criterion layer and index layer in structure，so as to determine the corresponding evaluation index system.On this basis，according to the weight level analysis of factors at each layer obtained by using fuzzy evaluation，the fuzzy estimation method is adopted to make the comprehensive evaluation.The method is verified to be reasonable and effective by the application example.This method provides an effective method and basis for the evaluate and selection of mine truck dispatching system.
    Numerical Modeling and Simulation on Chamber Filter Press Filtration Process
    GUO Nian-Qin, QIAO Bao-Meng, LIN Tong
    2016, 45(05):  144-148. 
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    In order to observe the flow morphology and regularity of the slurry within filter chamber and ultimately improve the filtration efficiency，3D geometry model of filter chamber was built.By adopting center feeding，Computational Fluid Dynamics（CFD) method was used to simulate the filtration process within the filter chamber of chamber filter press.Solid volume fraction increasing law，velocity distribution cloud images，velocity vector images，filter cakes formation law and pressure distribution cloud images within the filter chamber were obtained with the established model through the fluid simulation software Fluent.Under every entrance velocity，analysis of the solid volume fraction growth rate of different particle size within the filter chamber was analyzed，and combined with the pressure size distribution within the filter chamber at different entrance velocities；the appropriate entrance velocity was selected under higher filtration efficiency.By analyzing the velocity distribution cloud images and velocity vector images，the fluid flow state in the filter chamber and the impact on the filtration rate were obtained.By analyzing the formation and development laws of filter cakes，reference on better guide the practical work and improve the filtration efficiency of the filter press was provided.
    Application of Vibration Inclined Plate Box Thickener in Tailings Thickening of Tongjie Plant
    ZHANG Peng-Xiang, ZHOU Xing-Long, LAN Xi-Xiong, XU Xiang, LIU Pi-Hong, MA Fei, WANG Hao-Wei
    2016, 45(05):  149-152. 
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    With the capacity increase of the Tongjie Plant of Yunnan Hualian Zinc Indium Co.Ltd.，the ordinary box settling tank which was independently increased in the original factory was unable to meet the needs of production.In order to ensure the quality and quantity of the overflow water plant thickening system，a new type of highly efficient thickening equipment，a vibration inclined box thickener has been used for the splitting treatment.Through the production practice more than one year，when the -0.047 mm size fraction accounted for 53.36%，the concentration of 11.77%，flow rate of not less than 200 m3/h comprehensive tailings slurry is concentrated by ZXN-300 vibration inclined plate box thickener，the underflow concentration is more than 35%，the overflow solid-containing content less than 100 mg/L，the recovery rate of water is 70%～80%；one year production practice indicated the indexes are better than the original technological requirements，and the equipment is running well without fault；compared with box-settler group，the vibration inclined plate box thickener has the characteristics such as large capacity，little occupied area，high working efficiency and superior performance，it can be widely used in the high efficiency thickening of fine-size tailing.
    Bi-histogram Equalization Enhancement of the Undermine Uneven Illumination Image Based on Lifting Wavelet Transform Domain
    XIE Hai-Bo
    2016, 45(05):  153-157. 
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    Undermine illumination is uneven and the surfaces of surveillance cameras are covered by a large number of dust,so,the contrast of obtained video surveillance image is low and there are a large number of granular noise random distributed in video surveillance image.In order to improve the contrast of this kind of image and make full of the effectiveness of the underground video surveillance system,based on lifting wavelet transform (LWT),a adaptive enhancement method of underground uneven illumination image algorithm is proposed.Firstly,the histogram specification (HS) algorithm is adopted to conduct preliminary enhancement of the underground uneven illumination image;secondly,the preliminary enhancement image is conducted lifting wavelet transform,the low-frequency wavelet decomposition coefficient,based on the characteristics of them,the low-frequency wavelet decomposition coefficient is remained unchanged,a new wavelet thresholding function model based on the arcsine function is put forward to filter out the noise distributed in the high-frequency wavelet decomposition coefficients;then,the low-frequency wavelet decomposition coefficients and the filtered high-frequency wavelet decomposition coefficients are conducted refactoring,the underground image without noise is obtained;finally,the bi-histogram equalization (BHE) algorithm is used to improve the visual effects of the filtered underground image without noise.The performances of the algorithm proposed in this paper,histogram specification,counter-peaked mask and wavelet thresholding method are analyzed,besides that,peak signal noise to ratio (PSNR),root mean square error (RMSE) and edge protection index (EPI) are adopted to evaluate the preference of the above algorithms,the results show that the processing effects of the algorithm proposed in this paper is superior to the other algorithms,if has some reference for processing the undermine video surveillance image.
    Optimization Analysis of Yellow River Sediment Reclamation in the Northern Mining Area of Jining
    ZHANG Meng-Hong, WU Kan
    2016, 45(05):  158-162. 
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    Jining Mining Area belongs to a high phreatic mining area，and traditional reclamation methods have low recovery rate of arable land.The north of Jining mining area is the plain，filling soil material can not be adequately provided when reclamation.For the shortcomings of traditional rehabilitation methods，and taking into account that the mine in northern Jining is adjacent to the Yellow River，and it is very convenient for water diversion and sand transporting，a new method of filling reclamation by Yellow River sediment is proposed.First subsidence area and volume of different periods according to coal production are estimated，and sediment and water diversions demand for reclamation at different times are predicted.Then，the filling reclamation process of Yellow River silt is depending to determine the optimization principles，including optimization principle of pipeline layout，optimization principle of reclamation sequence and principle of improving the efficiency and capacity of sediment transportation.According to the principle of optimization，the appropriate layout forms of the pipe network are chosen to reduce reclamation costs；According to coal mining，the stable area in mining subsidence region is prior to be mined to avoid duplication of reclamation；selecting the appropriate sediment transport equipment and ancillary equipment，selecting the appropriate pipe diameter，pipe，and selecting the optimal water concentration of sediment，can effectively improve the sediment delivery capacity and of pipeline，and silt transport efficiency.All provide the basis for the actual reclamation project of Yellow River silt.
    Numerical Simulation on the Subsidence of the Paste-like Filling Mining based on FLAC3D
    WANG Meng, HUO Yu-Ming, SUN Shang-Xu, QIU Zhan-Wei
    2016, 45(05):  163-167. 
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    Mohr Coulomb constitutive model is used to predict and analyze the ground movement and deformation of 1327 working face after paste-filling mining of the industrial square coal pillar in Xi-ma Coal southⅠmining area based on FLAC3D numerical simulation software and modeling technology of Midas/GTS.After comparison with the probability integration method，it is found out that FLAC3D simulation results match with the measured data.Analysis results indicate that，FLAC3D numerical simulation do not need complex parameters but adopt the actual physical parameters of coal and rock，so it is simpler.The research result displays a more efficient research method for predicting and analyzing the paste-like filling subsidence and is considered as an effective complement to the traditional probability integration method.
    Comprehensive Evaluation of Mine Ventilation System Safety Based on Combination Weighting Extension Model
    JIANG Fu-Liang, YANG Zeng-Guang, LI Xiang-Yang, ZHANG Shuai, LI Ming
    2016, 45(05):  168-172. 
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    Ventilation system is an important part of the underground mine，and its comprehensive safety evaluation is of great significance in the production practice.Based on the related document，factors affecting the mine ventilation system are summarized as six indexes：qualified rate of air volume (wind speed)，qualified rate of air sources and quality，qualified rate of air quality in underground working environment，the available airflow rate of mine，efficiency of the main fan and air volume index of supply and demand.On this basis，the extension model of ventilation system evaluation is set up，and then the weights are integrated by game theory which be calculated respectively in advance by the variation coefficient method and the analytic hierarchy process.The integrated weight is used for evaluating the ventilation system.Finally，this model has been verified combining with the present situation of a mine ventilation system.The conclusion is that the safety of the mine ventilation system evaluation grade is medium (D3)，and the comprehensive evaluation result is coincided with the actual situation
    Influence of Rainfall on Permeability and Stability of the Dump Slope
    ZHANG Ya-Bin, CHEN Chao, GAN De-Qing
    2016, 45(05):  173-177. 
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    Dump stability during rainfall period is taken as research object，combined with accumulation characteristics and meteorological conditions of a dump of Tangshan，based on the different algorithms of multiple modules，such as SLOPE/W，SEEP/W of Geo-studio software，the soil water characteristic curve and permeability coefficient function are estimatedThe minimum safe stability coefficient of the mine dump slope in the natural state is calculatedVariation characteristics of Seepage and stability of the dump slope in different rainfall condition are analyzedThe results show that within certain rainfall intensity，immersed surface decreases gradually with the increase of rainfall duration，and pore water pressure is increasingThe coefficient of safety stability is gradually reducedThe slope gradually turns into instabilityThe increase of rainfall intensity will increase reduction rate of slope stability coefficient，with the increase of rainfall intensity and duration，the slope will eventually evolve into an unstable state
    Discussion on Environmental Anti-seepage Design of Category II Tailing Pond
    YUAN Yong-Qiang-
    2016, 45(05):  178-182. 
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    Tailing pond is a place for stockpiling mining industrial waste.According to the new national environmental protection law and the new code for design of tailings facilities，the environment-friendly anti-seepage design of category II tailings pond must be carried through，and the performance of the anti-seepage must meet regulatory requirements.The anti-seepage system is a crucial part of category II tailing pond，which can segregate the tailing and slurry water in the tailing pond from outside effectively，and prevent tailings water from polluting environment.the technical characteristics of HDPE film and geosynthetic clay liner，the structure design of anti-seepage layer in the environmental anti-seepage system，the major technical requirements of anchoring platform and anchoring ditch were mainly discussed.It is pointed out that the problems of adding recycled material，temperature difference in alpine region and the film thickness should be paid attention，when HDPE film is used.For the bentonite，it is suggested to choose sodium base bentonite.Bentonite waterproof blanket is not suitable for waterproof and anti-seepage project in high potency electrolyte solution.For the anti-seepage structure layer，it is determined by the factors of the permeability coefficient of the local tailing pond，and the single layer of the artificial composite anti-seepage structure is promoted according to the actual effect of anti-seepage engineering at home and abroad.
    Influence on Stability of Tailings Dam Under Muddy Water Infiltration
    SONG Zhi-Fei, WANG Jian-Qiang, ZHAO Fa-Liang
    2016, 45(05):  183-186. 
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    The penetration of the tail slurry suspended particles leads to the phenomenon of clogging in tailing dam，and a higher seepage line impacts on stability of tailings dam.First of all，the influencing factors of muddy water infiltration are studied，then an indoor simulation experiment is made according to the former study to obtain the general law of the general regularities of variation of the coefficient of permeability of muddy water infiltration by using a self-made muddy water seepage test instrument.According to the regularities，the related design parameters of a tailings dam is corrected，and the permeability function is estimated through particle size distribution curve which is obtained by laser particle size analyzer.Then the original and the adjusted parameter are respectively input to Geo-Studio SEEP/W module in seepage field simulation，obtaining the position and form of saturation line under two kinds of situations.Finally the simulation results are plug in the SLOPE/W module，to simulate dam body stability under three kinds of working conditions at the time of the high end.The result shows that the stability safety coefficients are all in a certain degree of decrease.Therefore，it comes to a conclusion that the stability of tailings dam can be reduced by the siltation.
    The Graph Method for Stability Analysis of Stope and Parameter Optimization
    WANG Jin-Bo, ZHOU Jing-Ren, ZHAO Yong, YANG Tian-Hong, HE Shao-Bo
    2016, 45(05):  187-191. 
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    In order to study the method of stability analysis and parameter optimization of stope，several kinds of indexes representing the engineering quality of rock mass in mines were acquired by the survey of engineering geology，the ore-bearing rock mechanics experiments，digital testing etc in Xiadian gold mine.The quality of rock mass is briefly evaluated，including the quality of the 54903 stope is good，and the 55002 stope is normal.According to the acquired index，the stability of stope under the current span was analyzed using the Mathews stability graph method.In the current 6 m stope span，the span can be reasonably increased since the stability of stope is higher.The stope stability critical span was concluded by the formula of the fitting-damage curve.Then through the comprehensive consideration of many factors，the initial span is designed as 7 m.Based on the graph of soft rock critical span，it is evaluated that the initial span 7 m is economical and safe.The application accuracy of the diagram method is briefly discussed by using FLAC3D and the stope span is finally determined.
    Deformation Monitoring Data Processing Method of Mining Area Based on Median Regression Analysis Method
    JIANG Chen, ZHANG Shu-Bi, WEN Xiao-Yong
    2016, 45(05):  192-195. 
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    Most of the parameters of the classical one and multiple variates linear regression models are calculated by adopting the least square estimation method,however,the least square estimation method without the anti-error ability,the performance of the least squares estimation method will be degraded by outliers,thus,the deviation is appeared.In order to improve the anti-error ability of the regression analysis method,the median is introduced to regression analysis method,a new regression analysis method based on median is proposed.The correlative theories of regression method and its application in deformation monitoring data processing are discussed and the basic principle of the median regression analysis method proposed in this paper is also analyzed in detail.The actual deformation monitoring data of the buildings of a mining area in Huaibei city are analyzed by the least squares regression analyssi method,the least squares estimation regression analysis method based on anti-error and the median regression analysis method respectively.The experimental results show that when the observed values is polluted by gross errors,the influence of outliers can be resisted effectively by the median regression analysis method,the fitting effect and prediction results of the median regression analysis method is superior to the other methods,therefore,it has some reference for improving the processing precision and efficiency of the deformation monitoring data in mining area.
    Accurate Detection Method of Concealed Goaf in an Iron Mine
    MA Fa-Cheng
    2016, 45(05):  196-199. 
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    In order to eliminate the great potential safety hazard that the goaf of iron mine brought to the iron mine workers and production,the accurate detection method of the goaf in a iron mine is studied.Based on anlyzing the working principle of the goaf detection by adopting the high density resistivity method,the goaf detection model is established,the identification characteristics of high resistivity anomalies and resistivity mutation of the goaf that is shown on the resistivity profile.Taking the goaf of a large iron mine of Wutai-Luliang region as an example,the accurate detection method of the goaf in a iron mine is studied.The distribution range of the goaf anomalies is delineated based on the goaf identification marks,the goaf is shown in the detection results figures obviously,the resistivity anomaly characteristics is consistent with interpretation marks,the drilling verification results show that the goaf can be identified effectively by adopting the high density resistivity method.Based on the three-dimensional laser scanning results of the goaf,three-dimensional model of the goaf is established,the spatial characteristics informatin of goaf is obtained accurately.The above study results show that the goaf of iron mine can be detected efficiently,economically and accurately by using the comprehensive detection method of adopting high density resistivity method to delineate anomalies,drilling verification and three-dimensional laser scanning modeling.
    Experimental Study on the Preconcentration of Rare Precious Metals in Kaldor Slag of Tongling
    DAI Xian-Ren
    2016, 45(05):  200-203. 
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    Pre-enrichment on Kaldor slag which is rich in precious metals of Au，Ag，Pt，Pd，Se before it returns into Kaldo furnace for re-smelt can improve the working efficiency of the Kaldor furnace，reduce production cost，solve the problem of returned material accumulate.The pre-enrichment technology of Kaldor slag was studied by Tongling Nonferrous Metals Company，the results show that：With ferrous sulfate as the activator on sulfide minerals，sodium sulfide as the activator on oxide minerals，the flotation flowsheet of two roughing two cleaning two scavenging and middlings return in order，final concentrate with grade of Au，Ag，Pt，Pd，Se is 508.76 g/t，55.78%，9.36 g/t，16.92 g/t，2.94%，and recovery rate of Au，Ag，Pt，Pd，Se is 95.60%，90.09%，78.00%，88.50%，86.70%;Using SLon-400 type centrifugal separator on flotation tailings，concentrate grade of Au，Ag is 9.45 g/t and 1 600.00 g/t，recovery rate of Au，Ag is 2.27% and 3.28%，flotation-gravity separation total recovery rate of Au，Ag is 97.87% and 93.37%.Therefore，flotation-gravity separation is an efficient recovery process for Kaldor furnace slag，gold and silver in the gravity separation tailings can be recovered by chemical dressing method.
    Beneficiation Recovery Experiment of Copper in a Certain Waste Smear of Qingyuan
    LIU San-Jun, YAO Wen-Ming, YANG Li-Li, ZOU Song, SHEN Li, WANG Wei, YUE Qi
    2016, 45(05):  204-208. 
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    A certain waste smear factory in Qingyuan City contains copper elemental and alloys of copper，iron，lead，zinc，antimony and tin，these metals are most tiny and granular or linear wrapped in plastics and rubber.In order to fully recovered these metals，copper recovery index comparison by using gravity separation，flotation，eddy current separation and electrostatic separation were conducted based on the comparison of the effect of ball mill，vibrations mill and cutting crusher for smashing smear and peeling metals.The results show that:cutting crusher is better at smashing and peeling；electrostatic separation is easier to obtain a good separation performance；copper concentrate with copper grade of 52.72%，the total metallic element content nearly 90%，the recovery of copper is 78.31% and the content of carbon and sulfur is relatively lower can be obtained by two roughing and one cleaning electrostatic separation process.The cutting crushing-screening-electrostatic separation is an efficient recovery process for valuable metal in waste smear，which not only has good economic benefits，but also has significant social benefits.
    Research on Purifying the Carbide Slag from Nanjing by Mineral Processing
    YAO Jin, XUE Ji-Wei, YIN Wan-Zhong, QUE Si-Qiang, HAN Hui-Li, CAO Shao-Hang
    2016, 45(05):  209-212. 
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    The particle size of the carbide slag from Nanjing is relatively fine with particle size of 86.81% -0.074 mm，CaO content can up to 69.83%，and the major impurities are SiO2，C，etc.Main impurities affect the whiteness of products are carbon and iron bearing minerals.To obtain high-quality carbide slag concentrate，the process of desilication using dodecylamine，decarbonization using kerosene all by reverse flotation and deferrization by high intensity magnetic separation for purifying -0.425 mm carbide slag was adopted.The results indicated that:For the products that have been removed the coarse fraction (+0.425mm)，with the reverse flotation process of one roughing，one cleaning and one scavenging adopted for desilicationg，then one stage reverse flotation for decarbonization，finally one stage high intensity magnetic separation adopted for deferrization，high-quality concentrate with CaO grade of 72.83%，CaO recovery of 81.57%，products whiteness of 90.14% was obtained which met the quality requirements of high-quality carbide slag concentrate.