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    15 May 2014, Volume 43 Issue 05
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    Influence of Rock Mass Creep on Slope Stability in Surface Mine
    REN Yue-Long, CAI Qing-Xiang, ZHANG Yong-Hua, SHU Ji-Sen, HAN Liu
    2014, 43(05):  1-4. 
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    In order to study the effect of rock mass creep on slope stability，as well as to evaluate the safety of open-pit slope during service period，and according to the timeliness slope theory and rock mass creep rule，the expression of long-term strength for mechanics parameters of slope rock mass was analyzed.Also，on the basis of simplified Bishop method in the limit equilibrium method，the calculation formula of circular sliding timeliness stability coefficient was deduced.In addition，the rule was found that the stability coefficient decreased in an exponential fashion with creep time climbing.By studying the timeliness stability of end-slope in the process of steep mining at Haerwusu open-pit mine，results were achieved that with the same lithologic parameters，the integral stability factor of end-slope reduced following a linear fashion with slope angle increasing，the shear strain and shear stress concentrates on the bottom of high and steep steps，and plastic transfixion area shows as circular shape.In addition，as creeping time grows，the timeliness stability factor follows the same rule regardless of different geometric shapes.Rock mass creep property will cause the shear strength and the slope stability factor decreased in an exponential fashion with creep time climbing.Grasp the creep characteristics of rock mass can predict the effective service time of slope，which has very important engineering value.
    Analysis on the Law of Roof and Floor Strata Movement in Coal Mining with High-water Material Backfilling
    XIE Hui, LIU Chang-Wu, HE Tao
    2014, 43(05):  5-9. 
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    Taking 1128 working face filled by high-water-content material in Xingdong coal mine，Jizhong Energy Resources Co.，Ltd. as research object，and through analyzing the filling method with high water material，testing physical and mechanical characteristics of high water material such as internal structure，unit weight，moisture content and volume strain by scanning electron microscope (SEM) and MTS in the laboratory，roof activity patterns and floor failure depth under the reaction of high water material and rock strata were researched combining with the field test data in filling working face.The results showed that filling efficiency in mined-out area was greatly improved when high water material was transported by pipes and adopting the hybrid-type filling method.High water material has good plasticity.With the increase of water-cement ratio，the material′s compressive strength decreased，and volume strain increased，and the material′s plasticity performs more obvious; When the underground goaf was filled by high-water material，stress state in surrounding rock was changed.The perturbations distance in front of working face was about 27.7 m，and the maximum failure depth in floor strata was about 22 m.The filling mining with high-water material decreased floor failure depth，shortened the perturbations distance ahead of working face and effectively controlled ground pressure′s behaviors.
    Design and Construction of Grouting Reinforcement for Multi Strata Goaf
    CHEN Li-Sheng
    2014, 43(05):  10-14. 
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    Multi-strata coal goaf belongs to concealed works.Due to its complex structure and being lack of stability，some measures should be taken if constructing new buildings especially high buildings on surface of goaf.Before governance，the feasibility for constructing was argued firstly，and based on the argumentation，reasonable design and construction were made.Combining with engineering example，some concerning issues in governance of multi-strata coal mined-out area were deeply studied.Based on the geological and mining data and using drilling detecting technology，the foundation′s stability was analyzed and assessed，and the grouting range，grouting scheme，and holes arrangement were determined.In the process of construction，such parameters as the material ratio of grout，grouting section division，grouting pressure and others were studied.Finally，grouting effect was tested with the use of drilling and geophysical technology，and the surface residual deformation parameters were estimated with probability integral method.The results showed that the grouting reached the expected target and provided guarantee for the safe operation of surface buildings.This research can be used as a reference for design and construction of similar project.
    Fault Water Gushing Exploration and Plugging Management in Deep Mine Roadway
    ZHANG Li, HUI Bing, ZHANG Qing-Song, LI Hai-Yan, LU Qiu-Sheng, JIANG Hai
    2014, 43(05):  15-20. 
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    Aim at the situation of the inflow point focuses at 15 m below the changing point of -808 m belt roadway in a mine.In the inflow area，rock mass is broken and the stability of surrounding rock is poor.The gush-out water endangers the underground safety and increases the cost of mine drainage.Through the analysis of engineering geology and geohydrologic conditions，the source of water is determined as sandstone M5 aquifer.This sandstone M5 had been cut by roadway，which results in the roof water gushing with fault conductivity type.The synthetic geophysical techniques and hydrological connected tests based on the transient electro-magnetic(TEM)method and the high-density electric method are made to find out the source of water gushing and the distribution of main channels.The Visual Modflow groundwater seepage simulation software is employed to analyze the underground water yield and its movement.And the plugging idea of the “deep cutting and shallow reinforcement” was proposed.Finally，the management schemes including grouting drilling design and parameter selection were determined and then implemented in the field.Grouting effect is evaluated with water inflow contrast method，obtaining that grouting has a remarkable performance.The research results have certain guiding significance for the similar engineering.
    High Efficient Divisional Mining Technology during Transition from Open-pit to Underground Mining in Xiaowanggou Iron Mine
    LI Nan, CHANG Shuai, REN Feng-Yu
    2014, 43(05):  21-23. 
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    There are some problems in Xiaowanggou Iron Mine，such as small-scale upper ore-body，narrow working space from open pit to underground mining，and deficient stopes in the first mining section，and hard to reach the expected productivity etc.In view of these problems，and on the basis of analyzing the caving possibility of ore rocks and the occurence conditions of orebody，a new scheme of three dividions based on the continuous caving of rocks was proposed.And then，according to the ranges of roof surrouding rock caving and rock movement，the safety of mining were analyzed.On the premise of keeping safety in mining，this scheme makes the productivity of underground mining in Xiaowanggou Iron Mine increase from 1 million t/a in original to 2.8 million t/a.Finally，the production practice showed that the multi-division mining technology based on the characteristics of roof surrounding rock caving expanded the work space as the simultaneous mining of open pit and underground.It not only greatly improves the productivity from open pit to underground in Xiaowanggou Iron Mine，but also achieves the exploration target with safety and efficiency.Meanwhile，it provides an effective way for high efficient exploitation of similar iron mines.
    Orthogonal Tests Analysis on the Influencing Factors for the Stoping Stability of Isolated Pillars
    DANG Jie, ZHANG Chen-Jie, GUO Sheng-Mao, HE Liang-Jun, ZHAO Wen-Qi, LIU Tao
    2014, 43(05):  24-26. 
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    By analyzing the influencing factors for isolated pillars in recovery process，and combining with practical engineering，six influencing factors for the isolated pillar and room including stope sidewall height(A)，sidewall thickness(B)，stope length (C), stope width (D), whether alternating backfill after mining(E), whether the full tailings cementing backfill at second step(F).Two levels are selected for each factor.8 simulation experimental programs were identified by analyzing the selected orthogonal table L8（27）.The isolated pillar model was established，and the stress distribution of the isolated pillar before excavation was analyzed by refutation.The excavation with orthogonal scheme was simulated based on FLAC3D numerical simulation software.The simulation of stress distribution and displacement after the isolated pillar was mined. The analysis results show: the displacement ranges of 6 influence factors A,B,C,D,E,and F in Y direction are respectively 4.8,0.698,1.404,1.305,1.623 and 0.164 mm.That is to say,the stope sidewall height (A) of isolated pillar has the most significant impact on its stability，and whether adopting the full tailings cementing backfill at second step (F) has a minimal impact.
    Stability Analysis and Treatment Scheme of Large-scale Landslide of Open Pit Slope
    JIA Zhu-Ping, ZHENG Lu-Jing, ZHENG Lu-Lin
    2014, 43(05):  27-31. 
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    In view of large-scale landslides in western mine transport of Jinfeng Open Pit Gold Mine，the reasons for it were analyzed from aspects of geological structure，water，weathering，blasting and mining activities etc..It is proposed that landslides be comprehensively treated by long pre-stressed anchor，bolt-shotcrete-net，anti-sliding pile，gravity guard wall and dewatering/depressurization holes etc.，and stone-concretes were backfilled in layers to reconstruct western the mine transport road. With application of rock mechanics software Slide，the reconstructed slopes of the mine transport road were simulated to make theoretical analysis its slope stability.The simulation results showed that the minimum safety factor of the slope is 1.13，greater than the safety factor 1.0 of slope failure.Robotic monitoring systems Autoslope and geological radar monitoring systems are adopted to survey the slope deformation with monitoring accuracy up to 0.1 mm.1-year monitoring result showed that the slope was in a stable condition.Through theoretical analysis and practical monitoring，the results showed that：① The adoption of long cable，bolt-shotcrete-net，anti-sliding pile，gravity guard wall and dewatering/depressurization holes had a good reinforcement effect; ② Stone-concrete backfilling in layers had an obvious effect in large-scale landslide treatment.This treatment method has some reference in the relevant landslide treatment.
    Optimization of the South End-slope Angle of Haerwusu Surface Coal Mine
    吕Can , LI Ke-Min, MA Li, LIU Gan, LIU Tong
    2014, 43(05):  32-35. 
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    The end-slope is the significant factor of composing the open coal pit，and the reasonable end-slope angle has a great significance on maintaining slope stability and economic benefit.Taking the south end-slope of Haerwusu open coal pit as a case，the numerical finite element method and three ultimate equilibrium methods of Fellenius，Bishop，Janbu were adopted separately to obtain the minimum stability coefficient to be 1.341 on the basis of the slope angle at 37°.There is a potential circular slip surface throughout the entire south end-slope.Its stability is in steady state and has the potential to improve.Based on considering the south end-slope constitutive characteristic and haulage system arrangement，four schemes of improving south end-slope degree were proposed.Numerical finite element method and ultimate equilibrium method of Janbu theory were adopted to analyze slope stability of four feasible programs，the results showed that the slope angle was increased to 40°，and the minimum stability coefficient reached 1.135.By this method，more than 438 thousand ton of coal resources and 181.5 thousand m3 of rock stripping volume were increased，which brings economic benefit of more than 73 820 thousand yuan.
    Analysis on Deformation Characteristics of Surrounding Rock Impacted by Sliding Mass in Open-pit Slope
    WANG Peng, ZHOU Chuan-Bo, JIANG Nan
    2014, 43(05):  36-39. 
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    The slope stability in the mine transferred from open pit to underground mining is a widely existing problem and the rational evaluation of the slope slip effect on surrounding rock at the bottom of the slope has important engineering significance for underground mining.Taking slopes formed in the process of excavation in Daye Iron Mine as project background，the sliding process of slide mass is numerically simulated with UDEC software，and the stress-strain laws of surrounding rock under the impact of sliding slope on the bottom after the slopes became unstable were studied from perspective of the stress field and displacement field.The results showed that the DEM software can effectively simulate the un-stability of sliding mass.After the un-stability occurs，the impact action mainly focuses on the foot of the northern slope and has a less impact on the mining area and the southern slope.The self-weight of sliding mass on mining area and hanging wall is obvious.On the vertical direction，the impact on surrounding rocks is weakened with the mining depth increasing.On the horizontal direction，the impact of sliding mass on the southern slopes is much lower than that on the mining area and the northern slopes.
    Effects of Superplasticizers on Properties of Whole Tailing Backfilling Materials
    FAN Zuo-Peng, REN Shao-Feng, ZHANG Zhong-Hui, CAI Meng-Qian, SHI Chen, HE Ting-Shu
    2014, 43(05):  40-44. 
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    The mined-out areas were filled with aggregates of whole tailings backfilling materials with excellent performance，high utilization rate of tailings，low energy consumption and low cost.According to the existing filling process of a mine，the aggregate fill technology in which the whole tailings replace the grade tailings can optimize the original cementing material and increase the solid concentration of tailings backfill slurry from 68% to 72%.The self-flowing transportation of whole tailings backfill material can be realized with the combination of superplasticizer.The effects of different dosage of four superplasticizers (naphthalene superplasticizer，polycarboxylate superplasticizer，aminosalfonic superplasticizer and aliphatic amino superplasticizer) on bleeding rate，rheological property，and strength of the whole tailings backfill slurry were investigated.The experiment results showed that the addition of superplasticizers effectively improved flow property and retard setting time，but it was disadvantageous to compressive strength.On the whole，SAF with the content of 1.6% not only substantially increased the flow property but also had little negative effect on compressive strength.SAF is the best superplasticizer to prepare the whole tailings backfilling materials and realize the self-flowing transportation.
    Quality Evaluation of Rock Mass and Stability Analysis of Slope in Songshunangou Mining Area
    WANG Wei, HU Bin, GAN Lu, 欧Guang-Jin
    2014, 43(05):  45-49. 
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    In order to evaluate the stability of slope rock mass after excavation and to guide construction safety，based on the discontinuity measurement and engineering survey，the characteristics of discontinuity distribution and rock mass′ structure in Songshunangou Mining Area were analyzed，thus obtaining the advantage discontinuity which controls the slope stability.Three-dimensional network simulation technology was used to make simulation on the advantage discontinuity above and establish the network model to represent the rock-mass′s structure.The network model was cut along each measuring line in parallel or perpendicular direction.It is found that rock-mass were cut seriously by the discontinuity，which provides favorable conditions for the formation of small-scale movable ore blocks.The fractal dimension of each section was calculated by the fractal geometry theory，finding that rock mass is in general or poor state.With the aid of the finite difference software FLAC3D，the stability of rock mass after excavation was calculated.The results showed that due to the excavation and unloading，larger displacement and plastic zone in some parts of slope were generated，possibly resulting in collapse and slippage.It fits with the quality assessment，so reasonably lowering the step slope angle is recommended.
    Location Optimization of Crushing Station under Pit in Surface Mine
    GUO Qiang, CAI Qing-Xiang, CHEN Shu-Zhao
    2014, 43(05):  50-59. 
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    With the increasing of production scale，semi-continuous system is widely used in surface coal mine.The practice proved that application of the semi-continuous system has greatly improved economic efficiency in opencast mines.Among this，location of crushing station plays a decisive role in improving production efficiency.With the aid of the definition of limiting slope and capacity requirements of crushing station in pit，the coal seam partition was made.On this basis，the calculation method for the transport distance of coal truck to underground crushing station and surface crushing station，increased transport distance of internal dumping and the elevating belt length in pit was present.After considering the semi-continuous system as a whole，and by the principle of totally minimum transport cost，the optimization model of crushing station layout was established to propose calculation methods for total transport freight of the truck，the increasingly internal dumping and the hoist system.Meanwhile，the model was applied into the practical engineering.The calculation results showed that the total transport cost is minimum when crushing station is arranged on +625 m level in Baorixile Open Pit Mine，and this is the optimal position for crushing station.In addition，the analysis indicated that location of crushing station in pit can not be too low to avoid from a worse impact on internal dumping.
    Mining Subsidence Prediction Calculation Methods of Random Shape Working Face
    XU Dong, WANG Lin-Qing, WU Kan
    2014, 43(05):  55-59. 
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    In order to make up for the shortage in mining subsidence prediction calculation methods of existing random shape working face，and more accurately predict the value of surface movement and deformation caused by coal mining，the working face is divided into several trapezoids according to corners based on the theory of probability integral method.The variable step-size Simpson double integral method is adopted to conduct the integration in every trapezoidal region according to the prediction formula，and deal with the effects which were produced by every trapezoidal unit to realize the subsidence prediction calculation of random shape working face through superposition method.In addition，through the study of inflection point displacement effect on the working face position，the solution method for actually calculating angular coordinate at boundary of the random shape working face is discussed.On this basis，the mining subsidence prediction program is designed and developed，realizing prediction of surface movement and distortion，analysis of prediction results and visual output.The actual mine working faces in a mining area was taken as a case to verify the calculation method and prediction program.The results showed that the program design is reasonable，and the prediction result is accurate and reliable，and accords with the fact.It can meet the needs for a wide range of subsidence prediction and provide the necessary technical support for “under three” coal mining and land reclamation planning.
    Numerical Simulation by FLAC3D during Shaft Excavation Process
    YAO Ya-Hui, Zhang-Yu-Jie, WAN Long, YU Xu-Bing
    2014, 43(05):  60-63. 
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    To counter the deformation and failure in shaft excavation process in a coal mine in Shanxi，and taking the hole inspection data of the coal mine as the geological background and 300~400 m underground rock stratum as the research object，3D simulation analysis on the shaft excavation process was made with application of FLAC3D software.The displacement and stress state of the shaft before and after each excavation step at 3 m were calculated to investigate the deformation law of shaft sidewall and bottom.The calculation results showed that the maximum vertical displacement of the shaft bottom heave that appeared at low-strength sandy mudstone with the excavation depth of 60 m was 12.99 mm.The sidewall deformation at mudstone section is larger than that at sandstone during the shaft excavation process and the maximum displacement of the sidewall that appeared at the excavation depth of 24 m was 2.48 mm in horizontal.Stress concentration easily appeared in the contact zone between mudstone and sandstone.Improving the strength of permanent support in mudstone and the boundary of sandstone and mudstone was recommended.These research results have important reference value for the mine shaft excavation.
    Beneficiation Process of a Fine Low-grade Magnetite from Xinjiang
    LIU Xing-Hua, CHEN Wen
    2014, 43(05):  64-69. 
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    The process of stage grinding，stage low intensity magnetic separation process and stage grinding，stage low intensity magnetic separation，cationic reverse flotation process was conducted in order to provide a reasonable beneficiation process for development and utilization of a fine low-grade magnetite ore from Xinjiang.The results showed that ①Iron concentrate with iron grade of 66.48% and recovery of 78.79% was obtained by adopting the process of stage grinding-stage low intensity magnetic separation process of three stage grinding and four stage low intensity magnetic separation at the third stage grinding fineness of 95.18% passing 0.038 mm; Iron concentrate with iron grade of 69.76% and recovery of 78.51% was achieved by adopting the process of two stage grinding，stage low intensity magnetic separation，cationic reverse flotation for the magnetic concentrate 2，regrinding for reverse flotation tailings，low intensity magnetic separation concentrate returned into the reverse rough flotation at the regrinding fineness of 96.34% passing 0.038 mm for reverse flotation tailings.② Even though single low intensity magnetic separation process is simple，the iron grade of final concentrate can be improved significantly by 3.28% under the condition of the last stage grinding capacity decreased by 22.99% through combined process of low intensity magnetic separation and cationic reverse flotation.
    Deep Reduction on a Hematite Ore from Australia
    LI Yan-Jun, YUAN Shuai, CHEN Bo, ZHOU Zheng, WANG Shao-Xing, LI Yun-Heng
    2014, 43(05):  70-73. 
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    A hematite ore from Australia are characterized by high iron，sliming easily and fine disseminated，hitherto regarded as being difficult to obtain qualified iron concentrate with conventional mineral processing process.Deep reduction-magnetic separation technology on the ore was carried out using coal as reductant in order to provide technical mechanisms for exploitation and utilization of the ore.The results showed that reduction temperature and time were the main factors that influence the deep reduction efficiency; iron powder with Fe content of 78.13% and recovery of 98.19% were obtained via dealing clinker，which are from deep reduction with excess multiple in coal blending of 2.0，at reduction temperature of 1 250 ℃ for 50 min，bed thickness of 30 mm，with grinding(about 80% passing 200 mesh) and one low intensity magnetic separation(107 kA/m）process.The process of deep reduction-low intensity magnetic separation technology is an effective way in exploitation of the ore.
    Experiments on Direct Reduction-Low Intensity Magnetic Separation of a Limonite in Yunnan Province
    WANG Chuan-Long, YANG Hui-Fen, JIANG Bei-Ping, ZHANG Jin-Long, LU Lin-Fei
    2014, 43(05):  74-77. 
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    On the development and utilization of a low-grade refractory limonite in Yunnan province，direct reduction-low intensity magnetic separation experiments were carried out.The results showed that under the ore，coal，CaO mass ratie of 100∶20∶15，at the roasting temperature of 1 150 ℃ for 50 min，and primary grinding for 86.66% passing 0.045 mm，intensity for one-stage magnetic separation of 199.04 kA/m，two stage of grinding 99.73% passing 0.045 mm，intensity of second-stage magnetic separation at 111.46 kA/m，metallic iron powder with iron grade of 93.17% and recovery of 88.43% was obtained.X-ray diffraction and SEM analysis on the roasted products indicated that iron minerals were reduced into granular and regular elementary iron at 50 μm in diameter，and was easily to distinguish from gangues，thus providing possibilities to liberate from the gangue minerals.Chemical components analysis shows that the final iron products can satisfy the requirement for steel industry for low contents of impurities.
    Experiments on Magnetic Roasting-Magnetic Separation of a Limonite in Guizhou
    DING Bao-Cheng, YANG Da-Bing, WAN Shi-Jun, WANG Xiong
    2014, 43(05):  78-81. 
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    A limonite ore in Guizhou is a kind of low-sulfur and low-phosphorus limonite ore with iron grade of 47.14%.Main iron minerals of the ore include limonite，lepidocrocite,psilomelane,pyrolusite and minor pyrite.Limonite was distributed in irregular colloidal and earthy states，and closely associated with gangue minerals.It′s difficult to effectively separate gangue minerals from valuable minerals through grinding process，and even easy to be slimed.Therefore ideal separation index can hardly achieved through direct high intensity magnetic separation or gravity concentration.In order to explore the limonite ore，beneficiation tests were carried out through the process of magnetic roasting-magnetic separation.The results showed that with the mass ratio of anthracite（2～0 mm） to coarse ore samples（3～0 mm）5%，iron concentrate with Fe grade of 66.23% and Fe recovery of 97.53% was obtained respectively at roasting temperature of 850 ℃ for 40 min，with the grinding fineness of the roasting products 97.5% 0.074mm，and magnetic intensity of mid-magnetic separation 218.95 kA/m.
    Reverse Flotation of the Mixed Magnetic Concentrate of Qidashan Iron Mine by a New Anion Collector DL-1
    ZHU Yi-Min, LI Wei, ZHAO Ning-Ning, LUO Bin-Bin, XIA Xi-Wen
    2014, 43(05):  82-86. 
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    DL-1 is a newly anionic reverse flotation collector developed by Northeastern University.In order to test the floating properties，mixed magnetic concentrate from Qidashan Dressing Plant with Fe grade of 46.02% was used to make reverse flotation tests，and the mechanism in quartz reverse flotation by DL-1 is discussed with Zeta potential measurement and infrared spectrum analysis.The results showed that：①Iron concentrate with Fe grade of 65.38%，recovery of 89.56% was obtained through closed-circuit reverse flotation flowsheet of one roughing，one scavenging，and middles back to the flowsheet in turn with normal temperature and DL-1 as collector; DL-1 can endure temperature changes，and high efficiently collecting quartz at a lower dosage of CaCl2.②There are electrostatic repulsion between quartz and DL-1 with pH of 9~12 in aqueous alkaline solution，and can be weakened by activation of CaCl2 to quartz; electrostatic/chemical adsorption may occur between quartz activated by Ca2+ and DL-1 with pH of 9~11.45，there are strong electrostatic attraction of quartz activated by Ca2+ to DL-1 with pH>11.45，therefore DL-1 can well adsorb and collect quartz at pH range of 9~11.45.③There are physical adsorption，hydrogen bond and chemical adsorption coexist between DL-1 and quartz surface with pH of 11.45，DL-1 can also well collect quartz without Ca2+ activation.
    Cationic Reverse Flotation of a Magnetic Iron Concentrate Using Flotation Column
    WANG Wei-Zhi, ZHAO Li-Bing, CHEN Li-Ping, ZHANG Qing-Feng
    2014, 43(05):  87-90. 
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    The magnetic iron concentrate (91.60% -0.074 mm) of an iron plant in eastern Hebei province is fine disseminated.Its degree of iron liberation reaches 94.4%，and is obviously enriched in fine fractions.In order to increase the iron grade of the concentrate，iron increase and silicon reduction experiments was carried out with on-site concentrate as the object，micro-bubble countercurrent contacting flotation column as equipment，and GE-609 as the cationic reverse flotation collector.The results showed that iron concentrate with iron grade of 68.12%，recovery of 98.88% were obtained with pulp density of 35%，feeding speed of 893 mL/min，GE-609 dosage of 60 g/t，inflating volume of 2.0 L/min，foam layer of 30 cm through process of one roughing，two scavenging，middles back to the flow-sheet in turn,and 9.92% iron in iron tailings.It indicates that it is rational to deal the ore with micro-bubble countercurrent contacting flotation column and cationic collector GE-609.
    Beneficiation Tests on a Low Grade Copper-molybdenum Ore from North China
    LI Cai-Qin, SUN Chun-Bao, LI Shao-Ying, LIU Xing-Gang, ZHEN Chun-Hong, KANG Jin-Xing
    2014, 43(05):  91-94. 
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    With the purpose of high efficiently developing and utilizing a low grade porphyry copper-molybdenum ore from North China at a low cost，copper and molybdenum bulk flotation tests were carried out with the new molybdenum minerals flotation collector as the subject，after finding that the main valuable minerals are chalcopyrite，bornite and molybdenite，native copper sulfide and secondary copper sulfide accounted for 97.10% of the total copper，molybdenum sulfide accounted for 96.02% of the total molybdenum.The results showed that copper-molybdenum mixed concentrate with copper and molybdenum grade of 23.72% and 1.044%，and copper and molybdenum recovery of 87.22% and 74.39% respectively can achieved at the reasonable grinding fineness of 65% -0.074 mm，Mo+MC dosage of 12+3 g/t，lime dosage of 1 500 g/t，2# oil dosage of 25 g/t through closed-circuit process of one roughing，three cleaning，three scavenging and middles back to the flow-sheet in turn.
    Experiment of Microwave Low-temperature Pretreatment Aid-leaching on a Gold Concentrate from Flotation
    KANG Jin-Xing, SUN Chun-Bao, GONG Dao-Zhen, ZHAO Liu-Cheng, XIE Wen-Qing, XIAO Kun-Ming
    2014, 43(05):  95-99. 
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    In order to illustrate the aid leaching effect of microwave low temperature pretreatment on fine scattered gold wrapped by sulfide，the effects of various aid-leaching conditions on gold leaching efficiency was researched with gold concentrate of flotation from Shuangqishan，Fujian，as raw materials，and the microwave low temperature pretreatment as the key method.The results showed that with the microwave pretreatment power of 3 kW，the time of microwave pretreatment for 6 min(the corresponding pretreatment temperature is nearly 300 ℃)，particle size of roasting slag of 80% passing 0.038 mm，dosage of sodium cyanide of 3 kg/t，leaching for 8 h，gold leaching rate reached 96.49%，and 4.17 percentage points higher than that with related conditions roasted in muffle furnace.Compared with strong oxidants aid-leaching，the leaching rate pretreated by microwave low temperature is 2 percentage points higher，since the microwave low temperature pretreatment changes the structure of ore，while the strong oxidants only ameliorate the concentration of dissolved oxygen in leaching process.Compared with other aid-leaching methods，the microwave low temperature pretreatment can increase gold leaching rate，shorten length of leaching time.
    Improving Vanadium Leaching Rate from Stone Coal Aided by Ozone
    HE Dong-Sheng, LI Qiao-Shuang, ZHANG Gang, CHI Ru-An, Zhang-Li-Min, ZHANG Jian-Gang
    2014, 43(05):  100-104. 
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    Engineering & Research Institute Co.,Ltd.of Nonferrous Metallurgy，Changsha 410011，China Effects of ozone on vanadium extraction efficiency with sulfuric acid leaching were studied using raw stone coal，weathering stone coal and roasted residue of raw stone coal as the subject，in order to find an appropriate exploitation and utilization technology for vanadium extraction.The results indicated that：①Vanadium leaching rate from stone coal，roasted residue and weathering stone coal was increased by ozone addition and increased with flow rate of ozone.②Ozone-aided efficiency was increased by raising the temperature.③Increasing concentration of sulfuric acid solution improved vanadium leaching efficiency of ozone from stone coal，while not the same for roasted residue of stone coal and weathering stone coal.④Vanadium leaching rate of stone coal ore，weathering stone coal and roasted residue was increased to 23.02%，61.05%，28.11% from 6.86%，51.81% and 24.24% respectively by addition of 25 L/h ozone flow，with 100 g sample at grain fineness of 78% passing 0.074 mm，sulfuric acid solution concentration of 25%，liquid to solid ratio of 5∶1，stirring speed of 600 r/min，at leaching temperature of 90 ℃ for 2 h，compared with that of without ozone,increased range reach 16.16，9.24 and 3.87 precentage points respectively.
    Beneficiation Experiment of a Graphite in Luobei of Heilongjiang Province
    LIU Xin, ZHANG Ling-Yan, LI Xiang-Yi
    2014, 43(05):  105-109. 
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    Minerals in a low-grade flake graphite ore from Luobei County，Heilongjiang Province，owns complicated dissemination and great hardness.Beneficiation experiments on the representative samples were carried out，in order to high efficiently developing the ore with less costs.The results showed that with the primary grinding fineness of 90.06% passing 0.074 mm，lime (1 000 g/t) as depressor for pyrite，kerosene (460 g/t) as collector for graphite，2# oil (70 g/t) as frother，the graphite with 13.12% of fixed carbon was treated.High quality graphite concentrate with fixed carbon content of 97.50%，recovery of 90.63% at fineness of 76.70% 0.074 mm was achieved through the closed circuit process of one roughing，five-stage regrinding and reconcentration (the last regrinding product was treated by two consecutive cleanings)，middlings1 discarding，middlings 2 and 3 mixed and then back to the roughing，middlings 4~6 combined with concentrate 1 and then into regrinding 2.The product can reach the standards of GB/T3518-1995.
    Application of Design-Expert in Grinding Test Design and Parameters Optimization
    WANG Ze-Hong, KONG Ling-Bin, CHENG Xu
    2014, 43(05):  110-113. 
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    In order to obtain a high reliable mathematical model of mill utilization coefficient with medium filling rate，material to grinding medium ratio，grinding time under small test work，grinding test was designed using Design-Expert 8.0 software，and the results were made model fitting and vertification.The results showed that single-factor influencing the mill utilization coefficient is weakened by grinded material to grinding medium ratio > medium filling rate > grinding time.Its interaction′s effect on the mill utilization coefficient are weaked as medium filling rate & material to grinding medium ratio > material to grinding media ratio & grinding time> medium filling rate and grinding time.Mill utilization coefficient reaches maximum，predictively at 0.298 t/(m3·h)，with medium filling rate of 35.79%，material to grinding medium ratio of 1.12 and grinding for 42.09 min.The predicting parameters of mill utilization coefficient derived from Design-Expert 8.0 closely approached the test results，which means that Design-Expert 8.0 software can be used to design and optimize grinding test quickly，efficiently and accurately.
    S and Pb Isotope Compositions and Their Geological Implications of Yaochong Mo Deposit in Henan Province
    LIU Qing-Quan, CHEN Xin-Meng, LI Bing, ZHANG Zhi-Hui
    2014, 43(05):  114-117. 
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    Taking Yaochong Mo deposit as the research object，the metallogenic material sources are discussed by analyzing the S and Pb isotope compositions characteristics of sulfide ore. The research results indicated that，the δ34S values of ore range from -2.89‰ to -1.6‰，and its isotope compositions owns tower distribution. It is inferred that，the isotope material sources are single and the ore has the characteristics of magmatic sulfur. The δ206Pb/δ204Pb value of sulfide minerals varies from 16.193 to 16.818,δ207Pb/δ204Pb value of sulfide minerals varies from 15.105 to 15.288，δ208Pb/δ204Pb value of sulfide minerals varies from 36.698 to 37.319，that is，the isotopic composition ranges narrowly. The μ value of Pb isotope in the ore deposit is low and its distribution is relatively concentrated，but ω value of Pb isotope is high，indicating that the lead isotope derives from the lower crust. According to the comprehensive analysis results of the mineralization geological background，geological characteristics and the exiting ore deposit genesis of Yaochong Mo deposit，it is concluded that，the porphyry mineralization of Yaochong Mo deposit come from the granitic magma that derive from the partial melting of the thickening lower crust. Yaochong Mo deposit belongs to the porphyry molybdenum deposit that is associated with lower crust molten role，and the minerals come from the lower crust.
    Research on the Measurement Instrument of Mine Spatial Information Integration
    YU Le-Wen, ZHANG Yuan-Sheng, LU De-Sheng, ZHANG Xuan
    2014, 43(05):  118-120. 
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    In view of the current situation of measurement system for mine spatial information，such as complicated operation，low efficiency，poor portability，poor integration，a new simple，efficient，hand-held measurement instrument of mine spatial information integration was developed.The instrument can calculate the distance by adopting the phase method and acquire the three-dimensional coordinate data by combining with the dip and the azimuth. The hardware system of the instrument was developed，with the functions of independent power supply，storage of measurement data，wireless communications and others so as to realize the three-dimensional handheld measurement. The measurement software of the instrument was improved，with the functions of communication interface and measured parameters configuration，real-time display of the survey coordinate，entity modeling and three-dimensional display of the space objects，and analysis and evaluation of the models. When tested in underground mine，the measurement instrument can quickly obtain three-dimensional coordinates of the unknown underground areas and realize the maximum measuring range of the instrument at 83 m and maximum measuring error of the instrument at 1cm with the characteristics of simplicity，high efficiency and portability. Its effectiveness and reliability can meet the requirements of the measurement of mine spatial information integration.
    Slope Angle Measuring Error and Sensitivity Analysis Based on the Distance Measurement Technology
    CUI Qing, CHEN Xi, JIA Xu-Guang, LI Xin
    2014, 43(05):  121-124. 
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    In order to measure the complex slope angle accurately and control the construction precision of slope engineering，a non-contact slope angle measuring device is designed based on the laser distance and video recognition technology.According to the three-dimensional geometric structure，measured parameters and trigonometric functions，the formula for calculating the complex slop angle is deduced.All of the error factors are discussed based on the indicators of the angle measuring device.According to the influence degree of the error factors to the final measuring results，α2 is regarded as the sensitive factor of the measuring device.According to the fixed error of the laser range finder(ΔL),the calculation formula of pseudo angle is deduced.The influence rule of ΔL to L1 is analyzed by case research method.The research results illustrate that，the inclination angle error increases with ΔL growing while with L1 decreasing.The measuring error of slope angle β follows in a positive linear correlation with ΔL.When the value of ΔL reaches to 1 m，slope angle measurement error can be as much as 2.92%.Nevertheless，the measuring error of slope angle β follows in a negative linear correlation with L1，when the value of L1 reaches 20 m or 10 m，the maximum slope angle error can be as much as 4.31% or 8.26% accordingly.Therefore，the measuring accuracy of slope angle can be improved by enhancing the accuracy of laser equipment and maintaining the effective distance between laser equipment and slope.
    Application of the FastICA Algorithm in Detection of Soil Geochemical Anomaly
    LIU Bin, GUO Si, WEI You-Hua, ZHAN Ze-Dong
    2014, 43(05):  125-129. 
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    The FastICA algorithm is applied to process the 1∶10 000 soil geochemical data in the area of Dachaidan town in Qinghai province.The correlation coefficients are introduced to overcome the limitation of sequential uncertainty after the separation of FastICA algorithm，and the cumulative frequency method is used to solve the problem of data amplitude uncertainly after separation.The elements anomaly zoning sequences are divided，among which 85%，95% and 98% are selected as the three levels of anomaly in classification.It is clear that the FastICA algorithm takes full consideration of the characteristics of high order statistics，so the data from the algorithm can more clearly reflect the spatial distribution characteristics of elements compared with delineating anomaly by the traditional cumulative frequency method.The late engineering validation confirmed that the elements anomaly distribution acquired by the FastICA algorithm highly matches with the actual ore body (mineralization).So，the FastICA algorithm has the function of restoring the real information and has the significance in guiding the next prospecting work.It is effective to process the geochemical data by applying the FastICA algorithm.
    Geophysical Indicators of Erlian Basin Sandstone-type Uranium Deposits
    ZENG Jian-Gang, NIE Feng-Jun, FENG Zhi-Bing, WANG Yan-Guo, YANG Bing-Bin
    2014, 43(05):  130-133. 
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    Based on the characteristics of airborne radioactivity survey anomaly，gravity and magnetic measurement anomaly，electrical measurement anomaly and the seismic reflection characteristics of sandstone-type uranium deposit in Erlian basin and combined the metallogenic regularity and conditions of sandstone-type uranium metallogenic deposits，a set of eye-catching prospecting indicators in the sandstone-type uranium deposits are deduced.It is confirmed that the areas surrounding γ high anomalies can be the source of uranium or directly the location of uranium deposits；The fault structures are the storage and the transport (H2S，hydrocarbons)channels for reducing materials (carbon dusts).It usually tends to form an oxidation-reduction zone in the surrounding strata of the favorable uranium metallogenic tectonic fracture.The sag slopes provide favorable hydrodynamic conditions for sandstone-type uranium mineralization，and it usually tends to form the uranium ore belts or uranium deposits in the regions of sag edge.In addition，through the methods of detailed analysis，and comparing with the characteristics of airborne radioactivity survey anomaly，gravity and magnetic survey anomaly，the electrical measurement anomaly and the seismic reflection，it is found that the geophysical method can be used to describe the basal and sediment (mainly sand stone and mudstone)shapes and analyze the sedimentary facies so as to obtain the metallogenic environment and metallogenic regularities of sandstone-type uranium.
    Design of Mine Vehicle-type Lithium Ion Power Management System
    LI Bo
    2014, 43(05):  134-137. 
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    In view of large-capacity Lithium ion battery being widely applied in coal mine，a power management system with mine vehicle lithium ion battery for mine electric control system was designed.Based on CAN bus，the distributed control management and protection for each single power is realized.According to the interim provisions on mine safety standards for the lithium-ion batteries and the facts that lithium-ion battery itself needs the protections of over-current，overload，extreme temperature and overcharge and over discharge to ensure the safe utilization of the lithium-ion battery power in coal mine environment.It realizes the health charging and fast charging of lithium ion battery by intelligent or manual control to improve the practicability of vehicle power.Meanwhile，the monomer of low voltage battery is charged by the way of active equalization，which made the whole lithium ion battery consistent in performance.The tests and the industrial application showed that this system can better guarantee the effective capacity of lithium-ion power and effectively extend the service life of lithium-ion power supply.
    Precision Detection in Complex Goaf Group and Couple Modeling with Multiple Softwares
    FAN Zhong-Hua, XU Zhen-Hua, WANG Jin
    2014, 43(05):  138-141. 
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    Due to the influence of the goaf pattern and geological condition，the conventional physical survey for mined-out area lowered the accuracy.It can not accurately output the three-dimensional space information and make post analysis difficult.Laser detection technology solved this problem well.But for the goaf group with a lot of complicated and messy point pillars，a bigger difficulty exists in both pre-detection and post-modeling.With the goaf group in Jiangxi Tungsten Mine as background，the three-dimensional laser scanning system FARO was adopted to make precise detection，and the point cloud data generated from the survey were disposed with Geomagic-studio software.Then，the coupling of three-dimensional space model and FLAC3D numerical model based on Minesight software and 3Dmine software was further explored.The practice has proved that the three-dimensional spatial model based on FARO system can more accurately statistic the amount of residual ores in mined-out area and its size.On this basis，FLAC3D numerical model based on three-dimensional measured space model can be used to analyze the stability of the goaf group.
    Prediction of Drain-fume Time of Single-end Roadway in Tunneling Process
    JI Hong-Guang, CAO Yang, ZHANG Ge, LI Song, CHEN Bu-Lei, JIANG Hua
    2014, 43(05):  142-145. 
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    The migration of blasting fume in single-end roadway is analyzed，and the mathematical model of blasting fume diffusion in the casting area is established from the viewpoint of mass conversation.Blasting fume monitoring in the -118 m tunnel in Guilaizhuang gold mine showed that the density of blasting fume at monitoring point increases firstly and then decreases.The process of blasting fume diffusion basically coincides with the exponential decay.The factors for fume-drain time are analyzed from four aspects of blasting，explosive，ventilation condition and tunnel.With BP neural network model，a stable network structure is obtained，regarding 10 groups data of explosive quantity，hole number，distance between fan drum and heading face，distance between monitoring point and heading face，air output，air temperature，roadway temperature，relative humidity of roadway as input，and fume-drain time as output.5-group of experimental input data was introduced into the BP network，obtaining that relative errors between measured results and network-training results are lower than 7%.Better prediction effect is achieved with BP neural network model.Accurate prediction of fume-drain time can not only arrange tunneling in a reasonable way，but also avoid occurrence of blasting fume poisoning incident，which creates significant meanings to safe and high-efficient production of mining.
    Evaluation of Ordovician Limestone Water Inrush Risk Zoning for First Working Face under High Pressure of Deep Under-group Coal Mining
    LIU Bin, ZHU Shu-Yun, LIU Jun, SONG Shu-Guang, WANG Cheng-Tian
    2014, 43(05):  146-150. 
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    In order to explore the feasibility for safe mining under pressure of North-China-type deep lower-group coal seam floor，with the first working face of the lower-group coal with high pressure water in Jibei mining area as an engineering background，combining with nine Ordovician limestone boreholes′ and one Ordovician limestone hydrological observation hole′s data，predicting assessment and zoning of the Ordovician limestone water inrush risk at normal block were analyzed with the water inrush coefficient method and integrated water blocking strength method of floor strata.The analysis showed that there are two regions with the Ordovician limestone water inrush values greater than 0.1 MPa/m.But according to the comprehensive water blocking strength calculation of floor strata，the integrated water blocking strength value of each borehole was greater than its corresponding actual pressure value，and then the ratio of actual pressure value to its corresponding integrated water blocking strength is analyzed.The results indicated that if Ordovician limestone water inrush coefficient is larger，the region with big ratio value of the actual water pressure to its corresponding integrated block water intensity just exists in dangerous zone.It is line with the actual situation.This research provides a new evaluation method for the floor water control during the transition to deep exploitation of coal resources under pressure in Jibei mining area or other areas with similar geological conditions.
    The Heat Source Analysis and the Research and Development on Air-cooling in Deep Mines
    CHAI Hui-Lai, WANG Jian-Xue, WANG Jing-Gang, BAO Ling-Ling
    2014, 43(05):  151-154. 
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    Mine heat sources analysis and cooling techniques are important for deep mining.Heat hazards in mines were analyzed from five aspects of heat releases from mine tunnel rocks，ore oxidation，the electrical and mechanical equipment，underground heat water and local heat sources.And the air-cooling techniques were classified into traditional cooling technology and modern cooling technology，and their principle，characteristics and application status were discussed respectively.There exists ice transportation and melting issues in cooling technique of ice manufacturing.But，the technique of cooling water is so mature that it has become the main cooling mean.The cooling techniques of gas power generation could eliminate the gas emission and heat hazard in the mine，and realize the utilization of resources in a more intelligent way.The cooling techniques of separate type heat pipe which is suitable for the large-scale heat-exchange equipments completely separated cooled water from warmed fluid without external power.Besides，the development and trend on the current cooling techniques in underground mines were proposed.
    Application of Acoustic Emission Differential Ratio Indicator in Instability Prediction of Mining-out Area
    LI Miao, ZHANG Hong-Jun, 欧Yang-Zhi-Hua , WANG Ji-Peng
    2014, 43(05):  155-157. 
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    There are numerous small or medium-sized mines in the eastern Hubei where instable accidents of mining excavations frequently happened.How to accurately and effectively analyze and predict the stability of mining-out area has been one of the important issues.Based on the application status of acoustic emission in the eastern Hubei，the AE differential ratio indicator was put forward，which took into consideration of such three AE parameters as the large acoustic emission events，and the total event period and the energy rate within a period of time.It can effectively reduce the interference on sound monitoring parameter fluctuations from the external environment，different geological conditions and different structures of the mined zone.Through comparing with the variation of the cumulative value of rock acoustic emission parameters in mined-out area，the general changing rule of the corresponding AE differential ratio indicator and its precursor characteristics of instability were obtained.The AE differential ratio indicator can not only reasonably and effectively analyze the stability of the mined-out area，but also simply and accurately predict the instable time.Then，AE differential ratio indicator was applied in Pumin iron mine in the eastern Hubei to predict the stability of mined-out area，and the prediction result was basically in accord with the actual situation，indicating that the indicator has certain applicability and rationality.
    Utilization Methods of Geothermal Resources in Jiaodong Peninsula Mines
    ZHANG Yong-Liang, LIU Yao-Xiang, CHEN Xi-Shan
    2014, 43(05):  158-161. 
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    With the large consumption of mineral resources，the deep mining in the mine becomes an inevitable trend，and more and more geothermal issues are emerging with it.The mine geothermal water is fresh water resource and contains heat energy，so it is very useful.Mine geothermal water belongs to green energy.However，without reasonably utilization，it will result in underground high temperature and seriously influence the production efficiency.In order to recycle mine geothermal resources，the principle and method of utilizing geothermal resources were analyzed from aspects of regulating inlet air temperature by the ground temperature effect，applying heat pump to metal mine and the recharging system of geothermal water respectively.Then，the corresponding theoretical models were built such as the heat exchange model between shallow borehole and air，the three-dimensional unsteady-flow mathematical model of pressure recharging.Experimental research and analysis on the utilization of geothermal resources were made，and then were applied into the typical metal mines in Jiaodong peninsula.The results showed that it is feasible for rationally utilizing mine geothermal resources in theory and practice.The research explores a possible way for development of mine green energy in China.
    New-type Mine Thermal Damage Prevention System and Its Feasibility Analysis
    REN Sen
    2014, 43(05):  162-165. 
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    As underground mining depth increases，mine thermal damages have become increasingly prominent.These threaten the health of mine workers，but also seriously affect labor and economic efficiency of the enterprises.Through in-depth study on traditional cooling technology，based on the analysis of the advantages and disadvantages of previous artificial refrigeration measures，a new mine thermal damage control system was presented.The system consists of two parts，which respectively applies the relevant principles of heat transfer and thermodynamics.The first part is the insulation material，which covers the rock surface of cooling tunnel，and its action is to reduce the rock thermal radiation and delay air warming acting with the refrigeration system.The second part is a set of artificial refrigeration system，which makes some reasonable improvements on the traditional air-compression refrigeration cycle.The cooling of the refrigeration system focuses on the cooling tunnel.This new refrigeration system modifies the original heat transfer into mixing of two fluids，which reduces the temperature of the air flow in the cooling tunnel without influencing the underground air volume and velocity.By this method，the cooling effect can be significantly improved，but also the system component is simplified.And the technical difficulties in the construction and operation management are lowered.The system can reduce capital investment，save the cost of production，and highly increase the security of the system.
    Vanadium Precipitation Tests for Pickle Liquor of Calcific-Roasting Vanadium Slag of Pangang
    HE Wen-Yi
    2014, 43(05):  166-170. 
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    In order to reveal the universal law of direct vanadium precipitation from acid leaching solution of Pangang vanadium slag，and determine the appropriate technological parameters of precipitation，the effects of ratio of ［V］/［P］，［V］，initial pH value on precipitation rate and the quality of V2O5 products were studied with acid leaching solutions in three different ［V］ and ［P］ concentration and their mixtures as object.The results showed that：①As the concentration ratio of ［V］/［P］ increases，the precipitation rate rises，and P content decreases in V2O5 products.②The requirement for ［P］ in leaching solution of calcium roasting process is lower.With ［V］/［P］ greater than 767 and ［P］ less than 0.042 g/L，the vanadium precipitation in calcium roasting process is the same as that in sodium roasting process with ［V］/［P］ greater than 1 100 and ［P］ less than 0.015 g/L.③The lower ［V］ in leaching solution is the lower of precipitation ratio.The optimal initial concentration for vanadium precipitation is between 32~40 g/L，as the pH of the supernatant is greater than 2.5，replenish of acid，heating，precipitating should be taken to improve the efficiency.④When the initial pH is about 2.0 and ［V］/［P］ is greater than 767(or ［P］ is less than 0.042 g/L)，the precipitation rate can reach more than 99.5%，and V2O5 content will be greater than 98.5% with less than 0.016% of P respectively.
    Secondary Graphite Recycling for Treating Graphite Tailings
    LI Feng, SONG Yong-Sheng, LI Wen-Juan, CAI Liao-Lu, CHEN Yong
    2014, 43(05):  170-175. 
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    In order to meet the needs of economic construction for graphite，protect the graphite resource of our country and the ecological environment in mining area，increase the social wealthy，flotation process was used to recycle graphite based on detailed property analysis of graphite tailings from Heilongjiang.The results showed that：①The particle size of graphite tailings was 89.48% passing 0.074 mm，contents of fixed carbon was 4.98%，degree of graphite liberation was 75.59%.Graphite from the samples exists in form of amorphism in mainly flaky or parallel aggregation，or monomer grain with strong heterogeneity.Graphite is mainly interlocked with mica and quartz.②Graphite concentrate with 85.65% fixed carbon，66.22% recovery was received through the process of one roughing，one cleaning-four stages grinding and five stages concentration-directly return of high grade middling + cleaning return after one scavenging concentrate of low grade middling to the process.The content of fixed carbon can reach the provision of GB3519-83 for fireproof.
    Grey Connection Analysis between Particle Size Distribution of Lead-zinc Tailings and Its Performance as Cement Mixture
    GENG Bi-Yao, NI Wen, WANG Jia-Jia, CHOU Xia-Jie
    2014, 43(05):  176-179. 
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    The mixture amount and particle size distribution of tailings in cement admixture have a certain influence on the cement property.In order to increase the property of cement admixture with tailings，the effect of particle size distribution of lead-zinc tailings on fluidity and compressive strength of its cement mortar was studied by using a lead-zinc tailing from Youxi county Fujianas province as main admixture through grey connection analysis.The result showed that the mortar′s fluidity and compressive strength can be increased by increasing grinding fineness of the tailings.With the tailings dosage of 30%，both mortar fluidity and compressive strength have a negative correlation with particle size of tailings +8.39 μm，and a positive correlation with particle size of tailings -8.39 μm.Among these，the maximum correlation with particle size of 4.24~8.39 μm，followed by 4.24~2.15 μm，2.15~1.09 μm，1.09~0 μm.To improve the property of cement admixture with lead-zinc tailings，and with the dosage up to 30%，proportion of particles -8.39 μm should be increased，especially the portion of 4.24~8.39 μm，and the portion of particles +8.39 μm should be decreased.