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Table of Content

    15 January 2013, Volume 42 Issue 01
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    Analysis and Application of Beams Model of Elastic Foundation with Paste Backfilling
    FENG Rui-Min, DING Zi-Wei, SHI Lei, YUE Tao
    2013, 42(01):  1-6. 
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    Based on the analytic method of beams on elastic foundation，the three principle factors were considered to build mechanical model on the condition of long-wall mining with backfilling，with which basic differential equations of deflections were obtained.All factors affecting movement of overlying strata，the distribution of the front and rear abutment pressure were analyzed through the solutions from these differential equations.The result shows that maximum deflection of immediate roof is 5~15 m at the rear of the mining face，the coefficient of elastic foundation is the most important factor affecting subsidence in gob，and the distribution of abutment pressure in gob also depends on the coefficient of elastic foundation.The most effective approaches to control and deflection of immediate roof and surface subsidence are to increase the value of coefficient of foundation and decrease the value of the gap between immediate roof and backfill.Field experiment at Xiaotun colliery also shows that the in situ value of maximum subsidence is 380.3 mm，which is very close to the predicted value 401.8~591.2 mm with the analytic method.
    Production Steady and Slope Stability Analysis during the Transition Period of Open pit to Underground in Miaogou Iron Mine
    LU Hong-Jian, GAN De-Qing, YANG Zhong-Jian
    2013, 42(01):  7-10. 
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    Combined with the actual mine production during the period of open-pit mining to underground transition of Miaogou iron ore，basing on fully mining ore quantity of transition period，put forward different regional potential ore body mining scheme and safety protection measures，achieved by the open-pit mining to underground mining production a smooth transition，with high feasibility and economic benefits.  
    Analysis of Benefits in the Transition from Caving Method to Backfill Method in Luohe Iron Mine
    ZHANG Ya-Dong, CAI Si-Jing, XU Tai-Song, HE Xiao-Wen, ZHANG Hui
    2013, 42(01):  11-14. 
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    The mining design at first phase of Masteel Luohe iron mine has been transited from caving method to backfill method.The necessity of the transition to backfill method is analyzed and both mining methods are contrasted from five aspects of technical and economic index，such as the cost of ore production，the impact to the environment etc.，concluding that the change from caving method to backfill method get remarkable social and economic benefits and is worth promoting.
    Analysis on Recovery of Residual Point Pillars and Stability of Mined-out Areas in Lingxiang Iron Mine
    WANG Ji-Peng, 欧Yang-Zhi-Hua , LIU Xia-Lin, LI Miao
    2013, 42(01):  15-19. 
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    In view of the influence of the recovery of residual point pillars at mined-out areas on the overlying strata and surface facilities in Lingxiang Iron Mine，the stoping process of the residual point pillars were simulated with FEM，indicating the stress change law and stress distribution of roof and verifying the feasibility of the recovery.According to the stress variety in the stoping process，it is recommended that the second stoping scheme be a lot safer and AE monitoring points be laid out at No.2 and No.5 pillars.
    Prediction of Landslide Deformation dy Dynamic Unequal Interval Grey Model
    XIE Mo-Wen, CHAI Xiao-Qing, JIA Ning
    2013, 42(01):  20-22. 
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    Based on the monitoring data of Jinpingzi landslide，the accuracy and applicability of the model is verified.The practice has proved that due to the latest data added to the system in real time，the prediction accuracy of the dynamic forecasting model is higher than that of the non-dynamic model，which is more applicable to engineering.Meanwhile，the monitoring data is stored based on SQL Server，and C # is used to prepare a model validation and prediction program，thus greatly improving the efficiency of the modeling and the prediction.The program is easy to use and highly applicable.
    Mining method selection for Third Phase Project of Shirengou Iron Mine
    ZHANG Jian-Yong, SU Jian-Jun
    2013, 42(01):  23-26. 
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    The advantages and disadvantages of sublevel open stoping with subsequent backfilling and sublevel caving method selected by Third Phase Project of Shirengou Iron Mine is analyzed and compared，and the economic and technical analysis is made.The results showed that: the sublevel open stoping with subsequent backfilling has the advantages as higher resource utilization ratio，less investment in capital construction，higher benefit，less land occupation，no relocation village，comprehensive utilization of tailings，smaller water discharge than that of the sublevel caving method.So the sublevel open stoping with subsequent backfilling is recommended.Shirengou Iron Mine should make necessary adjustment for the present Third Phase Project development work to meet the sublevel open stoping with subsequent backfilling.  
    Building and Application of Coal Roadway Surrounding Rock Deformation Prediction System
    SHI Gao-Peng, HAN Li-Jun, WEI Zhong-Ming, SUN Chang-Xing
    2013, 42(01):  27-29+37. 
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    According to the monitoring data of surrounding rock convergence and deformation，four kinds of nonlinear function are chosen to build the deformation prediction model of coal roadway surrounding rock by nonlinear fitting technique to achieve regression analysis and prediction of monitoring data.Based on Visual basic programming，a prediction system of coal roadway surrounding rock deformation is established in order to reflect the steady state of the coal roadway timely and dynamically.
    Experimental Research of the Hydraulic Model for Flood Discharge  Structures of Toushishan Tailings Pond
    ZHANG Jin, LE Tao, CAO Ji-Gang
    2013, 42(01):  30-32+69. 
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    Toushishan tailing pond is a proposed new tailing pond.According to the specification requirements，it is identified as second class tailing pond，and requires the hydraulic model test on the flood discharge structures.Through the model test，the rationality of flood discharge structure's types and dimensions of tailings pond is verified.According to the test results，the structure parameters which can satisfy the requirements are put forward，thus providing a basis for the design of tailings pond.
    Causes of Hanging Arch and the Related Prevention and Treatment Measures in Dadingshan Mine Zone
    TAN Bao-Hui, SUN Wen-Yong, LI Jin-Wei, ZHANG Zhi-Gui, CHEN Xing-Ming
    2013, 42(01):  33-37. 
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    Great emphasis on the causes of hanging arch in Dadingshan mine area of Sichuan Jinning Mining are proposed，and some prevention measures are put forward.Then a new effective treatment method is introduced，thus providing researchers for the similar mines with some valuable references.
    Study on Deformation Monitoring and Fracture  Characteristics of High-steep Slope in Nanfen Open-pit Mine
    KANG Rui-Fang, WANG Chang-Jun, FAN Jian-Wei, XIE Xing, XING Hong-Yu, YU Rui
    2013, 42(01):  38-41. 
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    TCA series of automatic total station was used to monitor the deformation of Nanfen Open Pit Iron Mine which has already formed a 492 m high-steep slope at stope footwall.After 3 years of continuous monitoring，a large number of precious data have been achieved.Through the processing and analysis of the data，the earth's surface will produce significant deformation and accumulated deformation will exceed 200 mm，and the peak deformation reaches 650 mm when the earth's surface displacement monitoring curve enters into “the accelerated mutation stage”.Monitoring practice shows that the monitoring technology has features of high reliability，high precision and simple operation，so it is worth promoting in the field of high-steep slope deformation monitoring.
    Analysis on the Mining Technology on the Transition from Open-pit to Underground Mining at Jinshan
    LIU Zhan-Wei, WANG Jian, LI Shu-Tao
    2013, 42(01):  42-45. 
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    The occurrence characteristics and mining technological conditions of the ore-body in Jinshan Mine are briefly introduced.And the feasibility scheme for transition from open-pit to underground mining is analyzed and discussed.Series of solutions and counter measures to the key technological problems of mining，the safety precautions and the ecological and environmental protection were proposed.The research plays an important guiding role in the future development of Jinshan mine.
    Test Analysis of FRP Bolt Supporting Anchorage Force
    ZHANG Jie, YE Yi-Cheng, WANG Wen-Jie, WU Jian-Fei, LI Dan-Qing, ZOU Chang-Fu
    2013, 42(01):  46-49. 
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    In view of the factors influencing FRP Bolt anchoring force including anchorage length，anchoring time，anchoring material，FRP Bolt pullout tests are carried out in the laboratory.By contrasting on the single factor，the impacting law of anchorage length，anchorage time，anchorage material on the anchorage force are analyzed.It is concluded that the FRP Bolt anchoring force increases with increasing of anchoring length and anchoring time.Various factors should be fully taken into considerations for selecting the anchoring materials.It plays an important rule in the design of the supporting parameters and the analysis of supporting mechanism of FRP bolt.
    Research of Genetic Algorithms on Loading Issue of Mining Material
    WANG Yong-Rui, WEI Ping, LI Quan, SHENG Yuan-Yuan
    2013, 42(01):  50-52. 
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    To enhance internal market management level in mine enterprise，and improve the storage and transportation efficiency of mining material，the research on optimizing loading pattern is a very important technical link.Based on the research of the assembly issue of mining scattered goods，the goal of goods distributing to maximize the economic benefit，considering the constraints of effective volume and burden quantity of vehicle，the mathematical model is established based on optimization method to solve，and the case is studied by introducing genetic algorithms on simulating biological evolution.The application results show that genetic algorithms have the advantages of fast convergence and high calculation accuracy in the course of solving optimal plan of mining equipment loading.Genetic algorithm is suitable to solve the multi-constraints problem because of its good adaptability and powerful search performance.The research in this paper is helpful to lift the efficiency of mining scattered material，and then，promote management benefit for the material management department in mine enterprise.
    Study on the High Efficient Mining Techniques in South Section of Xishimen Iron Mine
    HE Xin, REN Feng-Yu
    2013, 42(01):  53-55. 
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    A lot of silica rocks exposed from ore bodies in the southern district of Xishimen iron mine，resulting in deposits becoming gently inclined and thin.The mining process of the existing non-pillar sublevel caving mining method in Xishimen Iron Mine is improved.With the principle of three phases stoping，and in the form of upper and lower double working lines，both the upper “lean ore” and the lower “rich ore” can be achieved at the same time.It better adapts to the orebody occurrence and reaches the target of high efficient exploitation.
    Exploration of the Cemented Filling Process in Houzhuang Mine
    ZHAO Yong, WANG De-Hao
    2013, 42(01):  56-58. 
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    Based on the actual situation，Houzhuang mine itself developed，designed and built the cemented filling system-the filling process with on-site secondary pulping by tailing filtration.After three times planning and renovations，the cemented filling system was constantly improved and eventually realized the automation control of the filling process.Through contrasting 3 sets of effective parameters in cemented filling system，the third system has a stable pulping concentration and accurately-controlled cement-sand ratio，and can greatly increase the filling quality and efficiency.It can meet the needs of production.
    Study on Pumping and Cementing Backfill Technology of Underground Fractured Rocks in High Water Mine
    YAO Yin-Pei
    2013, 42(01):  59-61. 
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    Aiming to the difficulty-mined fractured sandshale ore-body of Hunan Baoshan Mine，the underground waste-rock crushing system and the mobile pumping and filling system are established，which can fracture the underground waste rocks in situ and mix them with cement，clay and water.After stirring，the mixed slurries are pumped and filled to stope by the mobile pumping and filling system.The study shows that the filling system has the advantages of higher work efficiency，higher concentration of slurry，lower cost，shorter pipeline and simpler lay-out without the influence of the filling line.
    Analysis on Misfire Accident in Surface Deep-hole Bench Blasting
    XIAO Xiao-Mei, XUE Yan-He, LI Chuang-Xin, CHEN Jun-Jie, CHANG Gen-Zhao, JIN Zheng
    2013, 42(01):  62-63. 
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    The presence of misfire has brought a huge security risk to the production of the mine in surface deep-hole blasting and affect the mining schemes as well.With the blasting cases，the causes of the misfire accidents in the surface mine are analyzed in detail，a series of measures to prevent from the misfire accidents are put forward to ensure the safety of surface mine blasting.
    Practice of Mined-out Area Blasting in Complicated Surroundings
    CHEN Jing-Jing, 蓝Yu
    2013, 42(01):  64-65+79. 
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    Considering several aspects of blasting parameters，initiating method and initiating circuit，the practice on treating mined-out area in complicated surroundings is introduced，which provide a reference for the technique personals.
    The Mining Technical Schemes for Recovering Production of Alden-topkan Lead-Zinc Mine
    ZHANG Ming-Feng, SU Jian-Jun, JIANG Ren-Yi
    2013, 42(01):  66-69. 
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    The Alden-topkan lead-zinc mine's geological feature and current situation are introduced briefly.Through analyzing and computing，and contrasting the comprehensive technical and economic index，the main mining technical schemes of construction scale，development schemes，mining method and main mining equipment for recovering production are determined.The practice in the mine's design and its production recovery shows that this main mining technical scheme is suitable for the mine to resume production of specific conditions，and is available for reference of similar mines.
    Research on Adsorption Rule of Cyanide Ions on the Pyrite Surface
    HAN Yue-Xin, MA Yi-Wen, ZHU Yi-Min, GAO Peng, ZHAO Jin-Ju, LI Jian-Bo
    2013, 42(01):  70-72. 
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    With pyrite as adsorbent and CN- as adsorbate，the impact of adsorption time，solution pH value，dosage of pyrite on adsorption effect are investigated. Meanwhile，the infrared spectroscopy detection method is adopted to analyze the difference before or after CN- absorption on pyrite surface，and adsorption results are fitted with Langmuir adsorption model. The results show that pyrite quickly adsorbs sodium cyanide and reach balance after 1 min with the maximum adsorption load up to 3.81 mg/g. pH has little influence on adsorption of cyanide ion by pyrite; Cyanide ion have a strong bonding adsorption action with pyrite. Adsorption of Pyrite particles to cyanide ion is a monomolecular chemical adsorption process.
    Experiments on the Magnetic Roasting-Magnetic Separation of a Limonite in Hunan
    GAO Zhao-Guo, CAO Yao-Hua, LIU Hong-Zhao, WANG Wei
    2013, 42(01):  73-75. 
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    Taking a low-sulfur low-phosphorus limonite with the Aphanitic gel structures in Hunan as a case，the technical conditions of the magnetic roasting and grinding are studied.The optimal technical conditions are determined as follows: the fineness of pelletizing ore is -0.074 mm 35%，the dosage of reducing coal is 10% of the ore samples，the optimum sintering temperature is at 800 ℃ for 80 min，the grinding fineness of the calcined product -0.045 mm accounts for 80%，the magnetic field strength in the low intensity magnetic separation is 90 kA/m.Under the above conditions，the concentrate with Fe grade of 58.83% and Fe recovery of 81.19% was ultimately achieved by the process of one-roughing and one-cleaning low intensity magnetic separation.
    Research of Copper-zinc Flotation Separation Process of a Copper-zinc Ore
    KUANG Jing-Zhong, JIA Shuai, LI Cheng
    2013, 42(01):  76-79. 
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    College of Resource and Environmental Engineering，Jiangxi University of Science and Technology There are high content of secondary copper oxide among a copper-zinc polymetallic sulfide ores at domestic. Due to its fine particle size of useful minerals and complex dissemination, beneficiation research of the ore to separate copper and zinc is made by adopting the process of grinding-copper-zinc bulk flotation-regrinding of mixed coarse concentrates-copper-zinc separation. Through the close-circuit process obtained from the above conditional tests, copper concentrate with Cu grade of 22.72% and recovery of 82.26%, zinc concentrate with Zn grade of 57.63% and recovery of 62.92% were achieved. Pyrite recovery retained in tailings will be reserved as follow-up study.
    Experimental Research on Cyanide Leaching of an Oxidized Gold Ore
    WANG Wei-Zhi, HAN Miao-Miao
    2013, 42(01):  80-82. 
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    An oxidized gold ore contains gold up to 7.76 g/t，but the gold recovery is highly undesirable by adopting the flotation process. Tests on the technical conditions of grinding fineness，sodium cyanide consumption，leaching time through segment leaching process are carried out，by which Cu ions that affects the gold leaching are pre-treated. The test results show that the ammonia pretreatment before leaching is conductive to weaken the negative impact of copper on gold leaching. Under the optimum conditions obtained from the above tests，gold leaching rate reaches 90.11%，which can meet the requirements of industrial production.
    Beneficiation Test on an Andalusite Ore of Inner Mongolia
    XU Guang, YANG Da-Bing
    2013, 42(01):  83-85. 
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    It is difficult to produce high-quality andalusite concentrate for a low-grade andalusite mine by adopting the traditional process of gravity separation-positive flotation-high intensity magnetic separation. Then, it needs to optimize the traditional process by the tests, that is, one reverse flotation is added to remove mica before the position flotation, and one cleaning is cut off. And the technical conditions tests are made for the newly upgraded process. Under the optimum technical conditions, andalusite concentrate with Al2O3 grade of 60.13% and andalusite recovery of 61.32% were obtained, which can meet the best standard for andalusite.
    Selection of Flotation Regents for the Mixed Concentrate of Fluorite and Barite
    YU Fu-Tao, GAO Hui-Min, SHI Wen-Tao, REN Zi-Jie, LI Ming-Feng, LIU Xi, CAO Wei
    2013, 42(01):  86-89. 
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    With the mixed concentrates of fluorite and barite comprehensively recovered from a lead-zinc tailing in Hunan province as the research object，the type and dosage of inhibitors and collectors were selected by inhibiting barite and floating fluorite，and the close circuit conditional tests were made. The results showed that with the YZ-4 as the efficient inhibitor of barite and sodium oleate as the efficient collector of fluorite，fluorite concentrate with CaF 2 grade of 96.81%，and the recovery of 92.44%，and barite concentrate with BaSO4 grade of 91.36%，the recovery of 86.75% and the density of 4.25 g/cm3 were obtained respectively by the process of one roughing-four cleaning-one scavenging and middle concentrates back to the flow-sheet in turn. By this means，the efficient separation of fluorite and barite was realized.
    Study on the Impact of F-contained Leaching Agent on Acid Leaching of Vanadium from Stone Coal
    ZHAO Jie, ZHANG Yi-Min, HUANG Jing, LIU Tao, WANG Fei, WANG Yi, LIU Juan
    2013, 42(01):  90-93. 
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    Regarding the stone coal roasted without any additive from Hubei province as the research target，the impact of F-contained leaching agent A on acid leaching of vanadium was studied. The results showed that F- in F- contained leaching agent A can break Si—O bond and Al—O bond in muscovite crystal structure，destroy the mica structure，and clear the pores of vanadium-contained minerals，thus providing a convenience for the reaction of acid with silicoaluminophosphate minerals such as quartz and feldspar etc..，The addition of F- contained leaching agent can lower the ΔG of the reaction of muscovite on thermodynamics; On the view of macroscopic，it can greatly improve the leaching rate of vanadium. Under the optimum conditions，the leaching rate of vanadium reached 85.37% and increased by 28.04%，compared with vanadium leaching directly with sulfuric acid.
    Experimental Research on Tailings Pre-discarding by Shaking Table of a Decarburized Stone Coal in Hubei
    BIAN Ying, ZHANG Yi-Min, ZHAO Yun-Liang, LIU Tao, CHEN Tie-Jun
    2013, 42(01):  94-96+150. 
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    Introduces the property of vanadium-bearing stone coal and its decarburized products.Due to the vanadium occurring in mica minerals in the form of isomorphism，different behaviors of mica minerals and gangue minerals in the process of rod mill and shaking table separation are analyzed，and the technical parameters of grinding fineness and shaking table separation of the decarburized stone coal are studied.The results showed that with the grinding fineness of -0.074 mm 63%，and based on the technical parameters obtained from the tests，tailings with removal rate of 12.99% and V2O5 grade of 0.21% are discarded by the process of one-roughing and one scavenging，so that the acid consumption and production costs can be significantly reduced.
    Hydrometallurgy Research Status of Rare Earth and Associated Niobium
    CAO Zhao, CAO Yong-Dan, LI Jie, QU Qi-Long, WANG Jie-Liang
    2013, 42(01):  97-100. 
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    Niobium is usually associated with rare earth. Firstly introduces four kinds of common decomposition processes of concentrated sulfuric acid roasting decomposition, sodium carbonate roasting decomposition, NH4Cl roasting decompositionand oxidizing roasting decomposition and three kinds of extraction processes like acidic extractant, synergistic extraction and complexation extraction from the aspects of the application range and the advantages and disadvantages. Then, the niobium extraction process of the acidic leaching and alkali leaching and the niobium acidic-alkali separation process are demonstrated. From the views of the progress records of the hydrometallurgical process for rare earth and niobium, how to improve the utilization efficiency of rare earth and niobium resources and reduce the environment pollution is still the driving force for development.
    Discussion on Improving Huize Lead-zinc Mineral Recovery
    DU Hao-Rong, YANG Bo, ZHU Yun-Fan, LIU Jie
    2013, 42(01):  101-103. 
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    Through the introduction of the ore property and the check of the flow-sheet，the main factors affecting the recovery of lead-zinc ores are proposed，including the unstable raw ore's nature，high over-grinding rate，not ideal performance of recovery equipment and pharmaceutical system on the recovery of super fine minerals. And such proposals to increase the recovery of lead-zinc ores are given as: keeping rational ore blending to stabilize the ore nature,selecting reasonable grinding medium to improve the uniformity of the particle size of grinding,adopting fine mesh instead of hydrocyclones to increase the efficiency of classification,increasing the recovery of useful fine minerals.
    Application of Hydrocarbon Measurement to Evaluation and Prediction of  Ore Prospecting in Longkou Lead-Zinc Deposit
    JIANG Hui-Qiao, CHEN Yuan-Rong, HUANG Xiang-Lin, LIU Yi-Zhi
    2013, 42(01):  104-106+154. 
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    Hydrocarbon gas has features of higher volatile，big migration distance，deep reflecting，and anomalies forming around ore bodies.Therefore，the hydrocarbon measurement method has been used to forecast the deep ore-prospecting in Longkou lead-zinc deposit.According to analysis on the content features of hydrocarbon components in different types of rock and the correspondence between hydrocarbon anomalies and the lead-inc ore in space，with the combination with geological and structural features，the deep mineralization potential in the region is evaluated and some valuable ore prospecting sections are outlined.
    Analysis of Borehole Magnetic Survey Logging Data in NLSD-1 Borehole of Nanling Scientific Drilling
    XIAO Kun, ZOU Chang-Chun, ZHOU Xin-Peng, XIANG Biao, WANG Li-Chen
    2013, 42(01):  107-109+157. 
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    Taking NLSD-1 borehole (100~1 000 m) of Nanling Scientific Drilling as the object，magnetization characteristics of different lithologies are researched by utilizing magnetic susceptibility of well logging，borehole magnetic tri-component data and record data of lithology.Meantime，anomalies of borehole magnetic tri-component are analyzed and interpreted.Magnetic susceptibilities of different lithologies diversified from high to low are: metamorphic fine-cutting sedimentary tuff，metamorphic dusty-cutting sedimentary tuff，multi-mineralized metamorphic fine-cutting sedimentary tuff，silicified metamorphic fine-cutting sedimentary tuff，silicified metamorphic dusty-cutting sedimentary tuff，multi-mineralized metamorphic dusty-cutting sedimentary tuff，tuffaceous slate and multi-mineralized tuffaceous slate; Anomalies of borehole magnetic tri-component are principally caused by magnetic body beside borehole and metamorphic sedimentary tuff.
    The Technical Advantage of Integrated Geophysical Methods in Blind Fault Exploration
    ZHANG Geng, TUO Xian-Guo, LI Bin, WANG Kai-Yang
    2013, 42(01):  110-112+128. 
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    Aiming at the geological and geophysical characteristics of surrounding massif around Majiatian tailing dam in Panzhihua，the blind faults in the site are explored in detail by using the shallow seismic method，the high density resistivity method，gravitational method and radon survey，and the geophysical data is emphatically explained.The result shows that an appropriate complex method could help to reduce the multi-solutions of inversion to a certain extent and increase the reliability of the geophysical prospecting.
    Design and Construction of the Three-Dimensional Integrated Information Management System for Digital Mine
    WANG 履Hua, SUN Zai-Hong, ZENG Hong-Yun, ZENG Wei-Bo
    2013, 42(01):  113-115+128. 
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    Based on the 3D visualization and virtual environment of digital mine，the technology of 3D GIS and virtual reality are adopting to model the surface and underground scene，mining process and the relevant phenomena in mine.According to the 3D digitizing of mine information，the information integration of the mine development and operation in true 3D environment are discussed to resolve the problems such as lack of foundational information，information islands phenomenon and visualization in the construction process of digital mine.By building the integrated management information system of digital mine，the scientific forecast，planning，control and monitoring to the mine development and operation are realized.It is of great significance to improve the efficiency and security level，enhance the competitiveness and realize the sustainable development of the mining enterprises.
    Design and Construction of the Three-Dimensional Integrated Information Management System for Digital Mine
    WANG 履Hua, SUN Zai-Hong, ZENG Hong-Yun, ZENG Wei-Bo
    2013, 42(01):  116-120+167. 
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    Based on the 3D visualization and virtual environment of digital mine，the technology of 3D GIS and virtual reality are adopting to model the surface and underground scene，mining process and the relevant phenomena in mine.According to the 3D digitizing of mine information，the information integration of the mine development and operation in true 3D environment are discussed to resolve the problems such as lack of foundational information，information islands phenomenon and visualization in the construction process of digital mine.By building the integrated management information system of digital mine，the scientific forecast，planning，control and monitoring to the mine development and operation are realized.It is of great significance to improve the efficiency and security level，enhance the competitiveness and realize the sustainable development of the mining enterprises.
    Construction and Thoughts of Digital Mining in Shougang
    SUN Jian-Zhen
    2013, 42(01):  121-124+150. 
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    In the paper，the digital construction，implementation and development of the main process of mining in Shougang mining are introduced，including digital mining construction，mining technology，mining equipment and automation systems，production scheduling system，etc.The constructive suggestions are referred in furthermore digital mining so as to achieve the final goal of automatic mining.
    The Ventilation Types Selection for Multi-Level Mining Based on Ventilation Network Simulation
    吕Tao , YE Yi-Cheng, WANG Wen-Jie, ZHOU Qi
    2013, 42(01):  125-128. 
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    Based on the research for the existing ventilation system of Jinshandian Iron Mine，the impacts on -340 m level due to the pollution air of -410 m level was simulated on the east stope multi-level mining.The 3D mine ventilation network model was established based on CFX and its accuracy was tested by the measured data.The ventilation of eastern-340 m level was improved by excavating and transforming the air shafts，increasing local fans and other measures，and the feasibility of the optimization scheme was judged by the simulation and analysis.The analysis of the wind speed and flow of mine air based on CFX provides scientific basis for the ventilation network optimization and design of ventilation system.
    Development and Performance Characterization of Stope Road Dust-depressor in Open-pit Mine
    HU Shu-Jun, LI Li, WANG Yuan
    2013, 42(01):  129-133. 
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    Based on the analysis about characteristics and mechanism of road dust raising in open mine，the components of dust-depressor was determined.The monomer and its concentration range were initially determined by monomer selection experiments of moisture agent，coagulation agent and surfactant.Based on the orthogonal test，and regarding the water loss rate as evaluation index，the optimal formulation was determined and its performances in the natural environment including moisture releasing and adsorption and wind resistance were tested.Results show that the formula obtained by experiments has good performance of moisture absorption and water retention，and it also has a good dust preventing and controlling performance due to its high surface strength and consolidation under dry conditions.With a wide range of material sources，simple preparation and low costs，it has a good application prospect.
    Plantation-evolution Forecast of the Overlapped Area of Crop and Coal Production on a Small Scale
    SHI Xiu-Wei, HU Zhen-Qi, HOU Zhan-Dong, LI Yuan
    2013, 42(01):  134-137. 
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    Based on a relatively small-scale，the software MSPS，which is based on the probability integral method，is used to forecast the plantation-evolution trends caused by coal mining subsidence in A and B county of Shandong.The results show that the areas in crop and coal production of A and B county is 31 658 hm2 and 19792 hm2 respectively，which account for 71.03 and 80.32 % of the coal-bearing areas and account for 27.70 and 20.21% of cultivated fields respectively.The arable lands are declining with the continued exploitation of coal mine.It is predicted that till the mines closure，there will be 38 934 hm2 arable lands damaged，accounting for 75.67% of the total overlapped area of crop and coal production，which means that there will be about 0.37 million farmers without land to cultivate.
    Discussion on Damage Mechanism of Tailings Dam under Earthquake
    PAN Jian-Ping, LIU Xiang-Ping, XU Shui-Tai
    2013, 42(01):  138-142. 
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    Based on stress analysis of the potential sliding mass of tailings dam，and considering the impact of saturated tailings dynamic pore water pressure and filling time on the dam stability，the calculation formula of safety factor for tailings dam in earthquake and post-earthquake had been derived，and the impact of dynamic pore water pressure on the work state of dam was explored.The analysis showed that the dam work state in earthquake is mainly controlled by the reduction of tailings strength and the dam inertial effects; the yield seismic coefficient is significantly affected by the cumulative effect of the dynamic pore water pressure.With the increase of the vibration times，dam yield seismic coefficient is getting smaller and smaller.A critical value of internal friction angle was introduced to distinguish the ultimate failure mode of the tailings dam，called the flow-type damage and the sliding-type destruction.In addition，the failure mechanism and the failure process of the two modes were respectively investigated.
    Analysis on the Factors Influencing the Heat and Moisture Transfer between Roadway Wall Rock and Airflow
    LI Yue-Tong, CHEN Yan-Ke, ZHANG Fa-Liang
    2013, 42(01):  143-145. 
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    Based on the unsteady heat exchange coefficient，the formula for airflow temperature after a passage of roadway is deduced.The calculation software Mathematica is adopted to analyze the influence of each parameter to the result of heat and moisture transfer between roadway wall rock and airflow.According to the result of analysis，both thermal conductivity of the rock and cross-section perimeter of the roadway have a certain impact on the rise of the airflow temperature.Meanwhile the influence of wall roughness is less，the mass flux of the airflow is more obvious and the evaporation of the water on or in roadway is quite strong.The precision of the calculation depends on the amount and precision of the interrelated parameters.
    Assessment of Heavy Metal Soil Pollution in the Environment of a Uranium Mine
    HUANG De-Juan, ZHU Ye-An, LIU Qing-Cheng, YANG Ya-Xin, PENG Dao-Feng, YU Yue
    2013, 42(01):  146-150. 
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    Based on the real monitoring data of the soil heavy metal elements sampled from water treatment plant, tailings dam and the surrounding soil of a uranium mine, the heavy metal pollution of soils are comprehensively analyzed and assessed by adopting the single factor pollution index, the Nemerow integrated pollution index method, the index of geo-accumulation and the potential ecological hazard index method. The results show that there are different levels of pollution at three sampling sites and seven heavy metal elements at each sample. For the integrated pollution levels of heavy metals at each sample, the tailings dam is the most and followed by the water treatment plant and the mine surroundings in turn. For the pollution level of each element, Cd is the worst, and followed by Cr and Cu in turn. This assessment can provide a scientific basis for the environmental governance in the mine.
    Experiments on Iron Concentration from Lead Slag with Coal-based Direct Reduction and Magnetic Separation
    YANG Hui-Fen, ZHANG Lu, MA Wen, WANG Chuan-Long
    2013, 42(01):  151-154. 
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    There are high content of Fe, Cu, Pb, Zn among Lancang lead slag in Yunnan. Tests on technical conditions of iron concentration with the process of coal-based direct reduction and magnetic separation are made, and the key minerals in tests are analyzed by XRD and SEM-EDS. The results show that under the conditions of the coal consumption occupying 30% of lead slag, roasting temperature at 1 200 ℃ for 40 min, with particle size of -74 μm 83.92%, iron powder with Fe grade of 93.68% and recovery rate of 77.59% were obtained by the process of one roughing-one cleaning with low intensity magnetic fields at 180 kA/m and 56 kA/m separately. The coal-based direct reduction method can transfer Fe-contained minerals with fine particle size, complex dissemination and low intensity magnetic field into metal Fe with large particle size, well district between iron and slag and high intensity magnetic field, which creates a favorable condition for low intensity magnetic separation.
    Flotation Process of a Gold-bearing Mercury Smelting Slag
    FU Kai-Bin, TU Chang-Neng, WANG Wei-Qing, FENG Qi-Ming, HUANG Yang
    2013, 42(01):  155-157. 
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    Gold exists in the form of free fine gold and gold-wrapped sulfide in mercury smelting slag with gold bearing of 1.85 g/t.Research on recovering gold by flotation from the secondary resources was carried out.The research results showed that under grinding fineness of -0.074 mm 80%，gold concentrate with gold grade of 28.65 g/t，and recovery of 68.45% was obtained by the flow sheet of one-roughing，two-cleaning，three-scavenging and middles back to the process in order.The main reasons resulting in low gold recovery are that gold occurs in ultra-fine particles or was wrapped by carbonates，limonite，quartz and silicate.
    Flotation Experiment of Silver from High Plumbojarosite-contained Zinc Slag
    YANG Zhi-Chao, GE Ying-Yong, LUO Heng, ZHOU Qin-Qin, WU Jian-Chun
    2013, 42(01):  158-160. 
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    The zinc slag from a lead and zinc smelter has complex chemical composition. Each metallic mineral has a mutual metasoniatism and a close disseminated relationship. The main useful element contains silver of 267.00 g/t in complex occurrence. 65.43% of silver occurs in the form of plumbojarosite, resulting in difficulty to realize direct flotation. The technical conditional tests are made for the zinc slag processed by the chemical heat decomposition. The results show that under the optimum conditions, silver concentrate with silver grade of 5 434.00 g/t and recovery of 72.59% were obtained by adopting the process of one-roughing, one cleaning, one scavenging and middles back to the flow-sheet in turn.
    Influence of Different Curing Conditions on the Property of Concrete with Ore Tailings
    CUI Xiao-Wei, NI Wen, WU Hui
    2013, 42(01):  161-163. 
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    With Angang Qidashan unground iron tailings as aggregate mixed with cementitious materials of iron tailings, blast furnace slag, cement clinker and natural gypsum of level 3 step mixed grindings, the concrete blocks of iron tailings are prepared. The concrete blocks under direct standard curing, 56 ℃ then standard steam curing and 90 ℃ then standard steam curing are separately analyzed from aspects of its strength, hydration products and microstructure. The results show that compared with the standard curing, 56 ℃ steam curing can improve the block's strength at each stage, however 90 ℃ steam curing only improve the early block's strength and have a negative impact on the later strength. All curing methods can form the compact high-strength iron tailings material consisting of quartz, the un-hydrated C3S and C2S, hydration products CH, ettringite and C-S-H gel, but have a different impact on the hydrating and hardening process of the iron tailings concrete.
    Preparation of Burn-free Ceramsite with Stone-coal Vanadium Tailings
    CHEN Jia, CHEN Tie-Jun, ZHANG Yi-Min, GUO Tao
    2013, 42(01):  164-167. 
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    With stone-coal vanadium tailing as the main Si-Al materials for preparation of burn-free ceramsiper，the influence of the dosage of lime，cement and the fly ash，the grinding fineness of vanadium tailings，and the content of the additive on the property of Burn-free Ceramsite with stone-coal vanadium tailings was studied，and ceramsite products are analyzed by XRD and SEM. The results indicated that the each performance index of the products generated under the optimum technical process can reach the international standard. Tobermorite (CSH) generated in the preparation of ceramsite is intertwined together in flaky or tufted form，which can greatly support the strength of ceramsite.