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Table of Content

    15 October 2013, Volume 42 Issue 10
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    A New Management Model of Five Grade Linkage of Mining and Metallurgical Engineering in Large and Complex Mines
    SHAO An-Lin
    2013, 42(10):  1-4. 
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    Taking the Eastern Mining Area in Ansteel Iron and Steel Group Company as a research object，and in view of the problems of exploiting hard in large and complex mines，a new management model of mining and metallurgical engineering: five ore-grade linkage (ore geological grade，ore-mined grade，beneficiation feed grade，concentrate grade，furnace feed grade) is innovatively proposed.In this model，the theoretical model is established，practicing the development thinking of getting breakthrough through technological research; realizing the linkage between the processes through the effective project management; and then fulfilling the overall outcome through optimizing the indexes throughout the mine.The implement of five grade linkage gained a number of important achievements，and obtained great economic and social benefits.
    Sandstone Strength Degradation Experiments under the Condition of Dry-wet Circulation
    ZHANG Peng, CHAI Zhao-Yun
    2013, 42(10):  5-7+11. 
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    Through the uniaxial compression test of sandstone，the strength degradation rule of sandstone under different dry-wet circulation is studied.The test results show that with the increase of dry-wet cycles，the peak intensity of sandstone decrease by exponential relationship，i.e sandstone strength degradation under dry-wet circulation is a progressive degradation with internal structure damage accumulation，extension until destruction.The research results provide a beneficial basis for short term and long term stability and safety evaluation of the engineering under dry-wet circulation condition.
    Study on Mine Pressure Behavior under Different Mining-Caving Ratio with Fully-mechanized Mining
    WANG Jin-An, GAO Zhi-Guo, WANG Li, LIU Teng
    2013, 42(10):  8-11. 
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    Taking Huating Mining Area in Gansu Province as the research object，the mode under seven different mining-caving ratios is set up with UDEC discrete element method to study the feasibility for safety mining under the optimized mining-caving ratio and the improved mining recovery.It is concluded that the mining-caving ratio of 1∶2.5 is optimal，and it is feasible for the safety mining as the recovery is improved.It provides a certain basis for determining a reasonable mining-caving ratio for similar fully-mechanized caving faces.
    Basic Theoretical Study on Stability of Timeliness Slope for Elliptic Deep Furrow Pits
    REN Gao-Feng, GUO Xing-Qiang, REN Shao-Feng
    2013, 42(10):  12-15+20. 
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    It is hypothesis that the strength parameters of deep furrow open pit slope varies stably with the time series，and the slope rocks are considered as the continuous，homogeneous and isotropic elastic modulus and jointly bear the gravity stress and horizontal stress at the same time.With the use of the time series modeling，the formula of the forecasting value for the rock mass strength parameters at random time is obtained.Then，taking the oval-shaped rock circle which is on the slope of an oval-shaped furrow pit as the model of the mechanical analysis，and combining with the theory of axial ratio，the Mohr-Coulomb theory and the critical conditions of gliding micro-body in the slope，the oval deep furrow slope' tangential stress expression with the timeliness is deduced，which fits the stable slope shape for the elliptic deep furrow pits.This slope not only can guarantee the slope stability，but also decrease the stripping ratio and improve the economic benefit of the mine.
    Optimization Design of Roadway Support Based on Field Measurement of Surrounding Rock Broken Zone
    QIAN Zhen-Yu, REN Fen-Hua, MIAO Sheng-Jun, LI Kai, JI Dong
    2013, 42(10):  16-20. 
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    In order to investigate the range of broken rock zone and stress state of surrounding rocks in -600 m level roadway of Sanshandao Gold Mine，field measurement of loose circle is carried out with the help of RSM-SY6 type sonic detector，and the results are verified on the basis of FLAC3D numerical simulation towards surrounding rock stress state.Finally，based on the measurement results and the stress distribution，the roadway supporting design and parameters of Sanshandao Gold Mine are optimized combining with the support theory of surrounding rock broken zone.The results show that the optimized supporting program offers a technical reference for the safety and benefits of Gold Mine production.
    Application Study of Caving Method and Filling Method Combined Mining in Jinshandian Iron Mine
    MEI Fu-Ding, WANG Ru-Kun, XIA Hong
    2013, 42(10):  21-24. 
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    With the state's increasing attention to land resources and environmental protection and increase of relocation expenses，the caving method and filling method combined mining at the same block becomes more and more popular among mental mine enterprises.Taking Jinshandian Iron Mine as example，the feasibility of the combined method is studied with theoretical analysis and numerical simulation，displaying the optimized stope layout and the effect of ground control，determining the safety thickness of link layer between two kinds of mining methods.
    Application of V-type Released Circle Roadway Joint-Supporting Technology
    HUANG Xue-Zhi, GUO Yuan-Bo, WU Song
    2013, 42(10):  25-27+31. 
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    Based on the analysis of the west main haulage roadway across the three coal-bearing geological conditions of Shunhe Coal Mine，and according to the released circle supporting theory，the supporting program of the roadway was determined.The joint-supporting of “anchoring-bolting-cable-shotcreting-grouting” means fully integrating the natural bearing structure of the surrounding rocks，and improves the integrity and carrying capacity of the supporting.Through monitoring and numerical simulation analysis，roadway deforms within its design limits.Engineering tests showed that the joint-supporting scheme has a good supporting effect.Compared with the shed supporting，it can lower the project costs，and speed up the construction progress.The scheme has certain value of popularization and application.
    Application of Pillarless Sublevel Caving Stoping Method in Inclined Medium Thick Orebody in Nalin Gold Mine
    TAO Guan, ZHOU Bo, WU Chui-Zhi, LU Fang-Ping
    2013, 42(10):  28-31. 
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    The experimental investigation of the pillarless sublevel caving mining method is introduced in detail in Nalin Gold Mine.According to the occurrence features of ore-body，the pillarless sublevel caving mining method was adopted to explore the inclined medium thick ore-body.Good economic benefits were obtained after application and practice for a period of time.It chose the sublevel of 676 m~684 m within the middle section of 660 m and the exploration lines between 14 and 20 as the experimental stope with industrial reserves of 22 778 t.In experiments，the mining loss and dilution rates were 23.65% and 18.18% respectively.
    Design and Practice of Optimizing Blasting of Double-track Railway Tunnel
    LIU Ming, ZHANG Chang-Suo
    2013, 42(10):  32-35+39. 
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    Taking the entrance excavation of Xinfengpingling No.2 double-track railway tunnel as a research goal，and through the on-site monitoring on adjacent tunnel vibration blasting process in tunnel construction，Sadaovski formula is applied to making the regression analysis of the field monitoring data，and controlling maximum detonation quantity under different objective and different spacing，and hole arrangement etc..The forepoling bolts are adopted between the existing tunnel and newly-developed tunnel to enhance the stability.Through the analysis on the waveform of the vibration velocity，the maximum velocity section of delay blasting is found out.Reducing the maximum charge quantity can lower the maximum vibration velocity and control the vibration velocity of adjacent tunnel within a safe range，thus guiding the follow-on construction.
    Feasibility Study of Gangue Strip Filling Mined-out Area Based on Strata Movement Theory
    XU Chun-Yun
    2013, 42(10):  36-39. 
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    On the basis of elastic foundation beam，mechanics model of strip filling mining strata movement is set up，and the finite element stress analysis on filling body bearing basic roof beam is made.The research further optimized the strip filling body's layout，spacing and width，and the regression analysis on the optimization is taken.The analysis shows that: the basic roof beam bears the largest force at the supporting inner edge of filling body and has the largest deformation in central district of unfilled zone between two adjacent filling body; if the strip filling body is of advancing interval arrangement in vertical direction of working face，it can effectively enclose the gas of mined-out area，and reduce the gas concentration in the return air lane; Stability of filling body lowers with the increase of mining depth and mining height，and increased with the increase of filling body's width.
    The Application Value of Foam Mortar Filling Body
    ZHANG Yao-Ping, SU Xiao-Ping, TAN Wei, YANG Shuang-You, GUO Wei-Jun
    2013, 42(10):  40-42. 
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    Cut-and-filling stoping method plays the great part in underground metal mining.In order to successfully introduce the foreign advanced technology-foam concrete technology in cut-and-filling stoping method and widely use it in domestic，the east stope of F17 in the third mining stope is chosen as the testing place because of its unique geological conditions.Through detecting foam mortar strength of filling body in nine different route of the No.1 stope of the third mining stope，it is shown that the strength of the foam slurry filling has already reached the strength index of filling body.At the same time，in comparison with ordinary mortar filling body，the foam mortar filling body has such advantages as light weight，easy mobility，equilibrium，anti-segregating，high supporting pit roof rate，and low cost.Thus it can be concluded that the foam slurry filling technology is economic and feasible in the east area of F17 in the third mining stope.
    Study on Calculation Parameters of Numerical Simulation Based on the Hoek Brown Principle
    LIU De-Feng, WANG Rui-Tao, GENG Ya-Dong, LIU Wei
    2013, 42(10):  43-46+71. 
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    It is important to determine rock mass mechanics parameters in numerical simulation. The basic principles of M.Georgi method and Hoek Brown method of determining the mechanical parameters of rock mass are introduced in detail. Taking research on determining rock mass mechanical parameters in Dongshengmiao Lead-zinc Mine as an example，and based on the physical and mechanical parameters of rocks at indoor laboratory tests，the effect of rock joints and fissures was considered to eventually determine rock mechanics parameters.The recovery model of the ore pillar was built by FLAC3D numerical simulation software，to simulate the surface displacement settlement.Then，the simulation displacement curve of three positions at columns and goaf roofs of No.2 ore body were compared with the measured displacement curve at the same place.The comparison results showed that the rock mechanics parameters determined by Hoek-Brown method were closer to the actual situation，which can be used as the basic data for simulating the recovery of rib pillars.
    Practical Construction of Floor Mortar Anchor in Large Height Rich-water Chamber
    GUO Cheng-Yue
    2013, 42(10):  47-49. 
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    In order to ensure that a large section of rich water chamber can be used for a long time or hold the late impacts of mining，and for serious water seepage of the chamber floor and bad anchoring performance of cement mortar，the wholly mortar cable construction method with the cement end anchor is proposed.The numerical simulation is made to study the impact of cable anchor plate support to supporting bearing structure.It is obtained that the bottom cable anchor can improve the distribution of plate's bending moment and the stability of floor load-bearing structure.The practice shows that: the bottom cable pass rate reached 97% and the construction method can effectively solve the difficulties in construction of the bottom anchor under similar conditions due to rich water and high construction height.
    Grinding and Liberation Characteristics of the High-pressure Grinding Roller Product for Qidashan Iron Ore
    YUAN Zhi-Tao, ZHU Shuo, LI Li-Xia, XIE Qi-Chun
    2013, 42(10):  50-53+57. 
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    Taking fine crushing ores from Qidashan iron ore as study object, the grinding characteristics and liberation characteristics of high pressure grinding roller product were investigated and compared with that of the laboratory jaw crushing products. The results showed that: the Bond ball mill work index of HPGR products were respectively lower by 13.96% and 28.23% than that of the jaw crushing product when the particle was in 0.074 mm and 0.280 mm. With regrinding fineness of -0.074 mm 80%, the relative grind-ability of HPGR and JC product in particle size of -3.2 mm and 3.2~0.074 mm reached 0.83 and 0.86. Compared with the JC products, the liberation degree of HPGR product in -0.5 mm was increasing by15.16%, and the liberation degree of iron ore in HPGR product is higher by 5.55 to 0.98 percent point under different grinding fineness. In addition, the intergrowth of valuable minerals in HPGR product can be easily liberated at secondary grinding, while JC product was in reverse.
    Thermodynamic Condition for Preparation of Single Phase of Fe3O4 Particle Using Mechanochemical Method
    BU Lin-Chao-Ke, ZHANG Bang-Wen, XING Rui-Guang, ZHANG Qi-Wei, ZHANG Yin
    2013, 42(10):  54-57. 
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    With the purpose of giving theoretical insight for preparation of single phase of Fe3O4 particles from Fe3O4 or coarse Fe3O4 using mechanochemical method, the impact of stored energy on the thermodynamics of the mechanochemical reaction of iron oxides was discussed. Results showed that the mechanochemical decomposition temperature of iron oxides in air decreases linearly with the increase of stored energy, and subsequently the phases in the reaction system changes within the temperature ranges in thermodynamically stable. On these ground, the thermodynamically stable region for Fe3O4 in the mechanochemical reaction system with Fe3O4 (or Fe3O4) as the starting reactant were drawn in the stored energy-temperature coordinate system, and thereby the thermodynamic condition for preparation of single phase of Fe3O4 from either Fe3O4 or Fe3O4 were clarified.
    Experimental Study on Beneficiation for a Refractory Low-grade Lead-zinc Ore of Inner Mongolia
    LUO Xian-Ping, DU Xian-Yan, ZHAO Yun-Xiang, ZOU Li-Ping
    2013, 42(10):  58-62. 
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    A lead-zinc ore of Inner Monggia belongs to a refractory ore, because it contains low grade of lead and zinc, among which zinc mainly occurs in marmatite, and lead-zinc minerals is fine embedded and closely associated with other minerals. Also, there are many pyrrhotite which has similar property with marmatite. According to the ore properties, the process of preferential lead flotation-low intensity magnetic separation to separate pyrrhotite from lead tailings-zinc flotation from low magnetic tailings-pyrite flotation from zinc tailings was adopted to treat this ore. Through the closed-circuit tests, lead concentrate with Pb grade of 42.27% and Pb recovery rate of 71.46%, zinc concentrate with Zn grade of 44.11% and Zn recovery of 70.93%, and S concentrate with S grade of 34.89% and S recovery of 85.66% were obtained respectively. The test provides a basis for development and utilization of this ore.
    Beneficiation Experiment of a Quartz Vein-type Micro-fine Disseminated Low-grade Gold Ore
    DU Shu-Hua, CHEN Li-Min, LIAO Li
    2013, 42(10):  63-66+75. 
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    In order to provide the basis for development and utilization of a quartz vein type micro-fine disseminated low-grade gold ore, and according to the nature of the ore, beneficiation tests were made by adopting the process of flotation-cyanide leaching of flotation tailings-cyanide leaching after roasting of flotation concentrate. The results showed that: through flotation and cyanide leaching of tailings, gold concentrate with Au grade of 61.88 g/t, As content of 4.21% and Au recovery of 77.57% and tailing leaching solution with gold leaching rate of 75.85% and gold recovery rate to the raw ore of 17.02% were separately obtained. Total gold recovery from both above reached 94.59%. Through roasting pre-treatment of gold concentrate, arsenic content in roasting dropped to 0.38%, and gold grades reached 88.40 g/t; Gold leaching rate was up to 93.28% by roasting and cyanide leaching, and gold recovery to the raw ore was 72.36%. Total gold recovery from roasting of gold concentrate and cyanide leaching of flotation tailings was 89.38%.
    Study on Beneficiation and Metallurgy Processing of a Refractory Gold Ore
    BAI Hai-Jing, NI Qing-Lin, LI Wen-Juan, CAI Liao-Lu, YAN Xian, LIU Mei-Lin
    2013, 42(10):  67-71. 
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    In order to provide the technical basis for developing a refractory gold ore, a detailed study on beneficiation and metallurgical processing was carried out.The results showed that: with grinding fineness of -200 mesh 80%, gold concentrate with Au grade and recovery of 57.32 g/t and 84.00% was obtained respectively by single flotation process.Through the process of floatation-tailing cyanide leaching, gold concentrate with Au grade and gold recovery of 60.09 g/t and 82.26% was firstly obtained under the grinding fineness of -200 mesh 70%.Then, gold leaching solution with Au leaching rate of 10.70% was achieved under regrinding fineness of -200 mesh 90%.Total gold recovery reached 92.96%.Therefore, according to the test results, the process of flotation-tailings cyanide leaching is recommended.
    Study of on Flotation Behavior of Ultrafine Collophanite in Sodium Oleate System
    WANG Yong-Long, ZHANG Qin, ZHOU Liang, TANG Zhong-Jie
    2013, 42(10):  72-75. 
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    Flotation behavior of ultrafine collophanite in sodium oleate flotation system is investigated and the five types of modifiers including sodium hexametaphosphate, sodium silicate, sodium pyro-phosphate, starch, sodium humate on ultrafine collophanite recovery are researched through flotation tests of single mineral. The results showed that the appropriate conditions for flotation of ultrafine collophanite with sodium oleate were pulp temperature 45 ℃,pulp pH = 10 adjusted by NaOH, sodium oleate of 6 × 10-4 mol/L; The inhibiting performance of five inhibitors on ultrafine collophanite is listed in order as sodium humate＞sodium hexametaphosphate＞starch> sodium pyro-phosphate＞sodium silicate.
    Study on Process Mineralogy of Xuanlong Type Oolitic Hematite
    WANG Shou-Jing, BIAN Xiao-Dong, ZHANG Yan-Jiao, LIU Guang-Xue, MA Chi
    2013, 42(10):  76-79. 
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    In order to provide the reference basis for large-scale development and utilization of Xuanlong-style oolitic hematite, its process mineralogy research was carried out. The results showed that: gangue minerals in the ore can be classified as two categories consisting of feldspar, quartz etc. and clay, mica etc. The former is disseminated coarsely with no close relationship with hematite. So it is easy to be removed through the beneficiation process. The latter is finely disseminated and closely associated with hematite, resulting that it is difficult to be removed. But it has a higher LOI, and can be reduced through roasting. Accordingly, the process of high-gradient high intensity magnetic separation-reverse flotation-roasting (can be merged with iron-making process) is recommended to treat Xuanlong type oolitic hematite. Finally, based on summarizing some previous research results and this study above, it is pointed out that the process mineralogy should focus on studying the disseminated characteristics of mineral aggregates.
    Land Cover Information Classification Based on the Optimal Band Combination of TM Image
    LIU De-儿, YU Hai-Xia-1, LAN Xiao-Ji, CHEN Yuan-Zeng
    2013, 42(10):  80-83. 
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    The accuracy of land cover classification is affected by the low utilization efficiency of the TM image spectral characteristics.Aimed at this issue，a classification method is proposed based on the optimal band combination.Taking the TM image in 2006 in Zhanggong district of Ganzhou as a study goal，the optimum index factor（OIF）is firstly calculated by the spectral characteristics of remote sensing image and the relation of bands.Then，the revised normalized difference vegetation index（RNDVI）is introduced according to the topographic feature in study region，and the original image is analyzed by principal component analysis(PCA).Through comprehensive analysis on the optimum index factor，the revised normalized difference vegetation index and three former principal components，it is concluded that the optimal band combinations are PC3，RNDVI and Band1.Finally，with combination of supervised classification and unsupervised classification，the composite remote sensing image is classified，obtaining that the overall classification accuracy is 86.2375% and the kappa factor is 0.8253.
    Engineering Case Study of Weak Interfaces Detection by EH-4 for Highly Weathered Rock Slope
    TAN Zhuo-Ying, ZHONG Wen, HU Tian-Shou, WANG Xiao-Jun
    2013, 42(10):  84-87+92. 
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    Based on the working principle and characteristics，on-site detection and the post data processing of EH-4 magnetotelluric imaging system，a highly weathered rock slope is detected on site to grasp the spatial distribution of its low resistivity layer.Combined with drilling data and geological analysis，the formation lithology is interpreted，and the distribution of weak interfaces is determined.The engineering practice shows that EH-4 provides advanced macro forecast for weak interfaces of the highly weathered slope which is worth to be applied and popularized in related fields.
    Soil Geochemical Prospecting in the Tropical Rainforest Landscape in Xishuanbanna
    JIANG Zong-Lin, SONG Ci-An, TANG Zhuan-Hong, WEN Jian-Sheng, RONG Hong, LIU Hua-Ying
    2013, 42(10):  88-92. 
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    Selecting Nanpo Copper Mine in Mengla county as an abnormal mineralized area，the paper summed up the optimal element-enriched layers，enriched granularity and traits of the important indicative elements when we carried out the soil geochemical prospecting for the copper mine in the tropical rainforest landscape areas.Thereby，it provides the theoretical foundation and practical ground for processing of the precise anomaly interpretation and evaluation during the future geochemical exploration in this region.
    Oxidation Belt DTM Fitting Method Based on Kriging and IDW Nesting Algorithm
    LI Di, HU Nai-Lian, LI Guo-Qing, YANG Hua
    2013, 42(10):  93-96+100. 
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    Sampling data of oxidation belt is wide and discrete，and the traditional interpolation methods are not fitting well with the discrete data.This resourch，based on the regionalized variable and variation function of Kriging along with Inverse Distance Weighted (IDW)，put forward a new algorithm nesting the two methods.Based on investigation in a large molybdenum deposit at domestic，the conclusion is that this algorithm is simple and can greatly improve the fitting accuracy of the digital terrain model (DTM) of oxidation belt.
    Hydrothermal Alteration and Distribution Features of Longtoushan Gold Deposit in Guangxi
    ZHANG Chun-Peng, ZENG 南Shi
    2013, 42(10):  97-100. 
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    By analyzing the distribution characteristics of hydrothermal altered minerals in Longtoushan gold deposit，it is considered that gold mineralization is closely related to tourmalinization and silicification.According to the K-Ar isotopic dating and so on，tourmalinization and silicification belong to the earliest hydrothermal alteration，which are related to hyolitic porphyry and breccia lava.Sericitization and kaoliniztion relate to the intrusions of granite-porphyry and biotite granite-porphyry at the later stage.The study results show that the depth of gold mineralization in this area is slightly greater than others which were often mentioned.
    Comparative Research on Composite Cutting Trajectory of Surface Miners
    SUN Kuan, LI Xin, HAN Liu, ZHOU Wei, DENG You-Ran
    2013, 42(10):  101-105. 
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    In order to study the actual cutting trajectory of surface miner，the basic operating type of surface miner was summarized，and the influence factors of the cutting trajectory were analyzed.By integrating the component of velocity on x and y direction，the trajectory calculation model was obtained in both clockwise and counterclockwise cutting mode，and the functional relationship between the cutting trajectory length L and horizontal velocity v，mining depth h，roll radius R and rotational speed ω was established.By studying the surfer miner of T1255，the relationship between length and difference of the two kinds of cutting trajectory and h，R and ω.The results show that the cutting trajectory of clockwise type is longer than counterclockwise，and the largest difference of power consumption is 6.83 kN·m.The two kinds of cutting trajectory increase with h increasing when rotational speed is fixed.While rotational speed is variable，cutting trajectory of clockwise increases firstly with the mining depth increasing，and reaches maximum when h= 0.5 m，then decreases with the mining depth increase.The counterclockwise cutting trajectory changes along with the mining depth increasing，and reaches the maximum at the largest mining depth.
    Ground Penetrating Radar Results Interpretation based on Matrix Similarity
    SUN Xiang-Xin, HE Lei, MING Shi-Xiang, ZHANG Lian-Heng, MA Yin
    2013, 42(10):  106-109. 
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    Based on lots of experiences of image interpretation，the relationship between the radar image and the water content，and the imagine rule with different water conditions are found out.In the opinion that all the images can be expressed by color value matrix and the matrix similarity indicates the images' similarity，the method of classifying the water conditions of ground penetrating radar results by matrix similarity is put forwards.The color value matrix is used to extract the image and to calculate the central value of feature vector in different types of water condition.Then，the feasibility on the matrix similarity method to interprete the ground penetrating radar results is verified with good effect achieved in practical application.
    Cutting Method and Automatic Generating Image of Numerical Model of Flac Based on ArcGIS Engine
    WU Wei-Bin, JI Hong-Guang, CAO Shan-Zhong
    2013, 42(10):  110-111+115. 
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    Based on secondary development of ArcGIS Engine，a cutting algorithm suitable for grid cells of six-sided block was proposed on the foundation of zone information of models in order to achieve the function of cloud picture view.The algorithm can achieve cutting model along three axis directions and quickly generate color cloud picture.According to the method，the stress condition of three axis direction can be quickly showed by cutting numerical models based on secondary development of ArcGIS Engine.
    Remote Sensing Investigation and Environmental Impact Analysis of Tailing Dams in Shaanxi Province
    QIANG Jian-Hua
    2013, 42(10):  112-115. 
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    With the use of SPOT-5，RAPIDEYE satellite remote sensing data，the identification method for tailings dam is studied.All distribution status of tailings dams in Shaanxi Province is investigated and the environmental problems are analyzed.Till 2012，there are 270 of tailing dams in Shaanxi Province，which are mainly concentrated in Qinling-Bashan Mountain Area in Southern Shaanxi with main types of lead-zinc ore，iron ore and molybdenum ore; The impact of tailing dams on the environment indicates as follows: the tailing dams occupies a lot of land.The harmful ingredients contained in tailings pollute the rivers，and some defective or dangerous dams easily result in debris flow hazards.
    Automatic Monitoring System for Feeding of Mill Based on Configuration Software
    YU Zhong-An, ZHANG Zi
    2013, 42(10):  116-119+123. 
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    With combination of PLC and configuration software, a set of automatic monitoring system for feeding of mill in a dressing plant was established. During the process of adopting the MCGS configuration interface, three kinds of blanking means for fabric belt were proposed for making right choice according to the actual need, including sequential blanking, optimal blanking at fixed level and fuzzy control blanking. Meanwhile, in order to reflect the continuity of the mineral processing production, the discharge from ore bin in mill feed system was arranged in frequency control to achieve the purpose of the constant feeding and to make the ball mill run normally. As well, remote monitoring can be realized by the functions of real-time curve, historical curve and alarm reporting of configuration software.
    Pre-concentration Effect of CCTS-type Magnetic Separator for Coarse Particle to Lean Magnetite Ore
    CHANG Lu-Ping, SUN Fang, YANG Ren-Xin
    2013, 42(10):  120-123. 
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    In view of low efficiency in dry magnetic pre-concentration for tailing discarding of lean magnetite ore，CCTS-type wet permanent drum magnetic separator for coarse particles with capacity of 150 ~ 200 t/h，magnetic strength of the cylinder surface of 400 ~ 500 mT，maximum feed particle up to 15 mm has been developed by Sinosteel Maanshan Institute of Mining Research Co.，Ltd..A number of experimental results showed that CCTS-type wet permanent drum magnetic separator for coarse particles can be widely used in various poor magnetite ore at domestic，and the wet tailing discarding is significantly more efficient than dry ones.The industrial application in Shandong Hualian Mining Co.，Ltd.，Liguanji Iron Mine of Shandong Fuquan Mining Co.，Ltd.，Shandong Cangshan Iron Mine，indicated that CCTS-type wet permanent drum magnetic separator for coarse particles owned a good promotion prospect.
    Application of Disc Press Filter in Concentrator of Jiusteel with Capacity of 4 000 000 t
    WANG Guo-Dong, LIU Qian-Fan, GAO Ze-Bin
    2013, 42(10):  124-127. 
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    In Jiuquan Iron and Steel Company, the original concentrator with capacity of 6 500 000 t adopts the disc vacuum filter to treat iron concentrate, by which the cake moisture generally reaches 15.5%~16.0%, and sometimes even higher. A capacity of 4 000 000 t new concentrator in Jiusteel expected to control the cake moisture less than 13% in order to meet the needs of the sintering process. Based on the laboratory tests and semi-industrial tests, GPJ-120 disc press filter produced by Shandong Laiwu Coal Mining Machinery Co., Ltd. is adopted as filtration equipment to filter the concentrate. After putting into operation, the cake with moisture of 12.69% on average, dry basis average coefficient of 1.03 t/(m3·h), and filtrate solids content of less than 3% reaches the goal expected. Its successful application in 4 000 000 t new concentrator in Jiusteel indicates that it has a promotion potential in filtering the refractory metal minerals.
    Impact Frequency Acquisition System of Down-the-hole Drill based on LabVIEW
    ZHANG Yong-Xi, YANG Chen, LI Dong-Ming, YAN Jie
    2013, 42(10):  128-129+151. 
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    By means of LabVIEW virtual instrument technique，the real-time extraction for the impact frequency of down-the-hole drill was realized，and the impact frequency of a certain type of down-the-hole drill was successfully extracted.On the basis of the impact frequency，the research provided a reference for intelligent control，impact strength analysis，on-line monitoring and fault diagnosis for the down-the-hole drill.The overall system has features of simply structure，stable performance and high signal fidelity，meanwhile good effect has been obtained in the practical application.
    Study on the Effect of the Open-pit Blasting Vibration on Reservoir Dam Planned to Be Constructed
    ZHAO Kui, WANG Ming, HE Wen, WANG Xiao-Jun, KE Xin-Hua
    2013, 42(10):  130-133+139. 
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    The medium-length hole of blasting is applied in an open-pit mine and an acid reservoir dam is planned to be constructed nearby the final boundary of it.In order to study the effect of blasting vibration on stability of the dam，the field testing of blasting vibration was carried out and the formula of the maximum vibration velocity was obtained by regression analysis method.Furthermore，the formula of maximum vibration velocity at the dam was modified according to the actual engineering environment.Based on this，the safety factor of the dam affected by blasting vibration at different stages of open-pit mining was analyzed by using the numerical simulation.The results showed that the dam is stable during the first stage of blasting and the dam has a poor stability during the second stage of blasting.The plan of decreasing the maximum explosive dosage at the second stage was proposed.
    Analysis of Spatial Distribution Characteristics of Soil Metal Elements in Xingqiao，Tongling
    WANG Ze-Qun
    2013, 42(10):  134-135+139. 
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    The geo-statistics method is used to analyze and investigate the spatial variation characteristics，enrichment status and influence factors of Cu，Pb，Zn elements in surface soil in Xinqiao Area of Tongling.The results showed that the spatial distribution of heavy metals in enrichment area is highly associated with the known deposits，indicating a close relationship between heavy metal enrichment and mining activities.Meanwhile，agricultural fertilization and irrigation can also lead to the Pb and Zn pollution in large areas，which need to be taken enough consideration.
    Analysis and Evaluation on Tourism Resources Development Conditions of Yeshan Mining Wastelands
    WANG Jing
    2013, 42(10):  136-139. 
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    The conditions of resource development are analyzed from the conditions of landscape resources.SWOT Analysis model from management science was introduced to analyze and discuss the mine tourism development from advantage，disadvantage，opportunities and challenges.Individual tourism resource was evaluated and classified with the combination of the tourism resource technical evaluation and grading evaluation from tourism science.It is pointed out that only constant innovation and active development can realize a great-leap-forward development of the town-economy in Yeshan Mining Area.
    Analysis on the Regularity of Metal and Nonmetal Mining Accident and the Countermeasures
    XU Wei-Wei
    2013, 42(10):  140-143. 
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    mines.Based on this，the safety production stage of metal and nonmetal mines was studied to find out the inherent laws of the metal and nonmetal mine accidents from industry，area，time，type and reason.Through the analysis of the reasons for the the accident based on the "comprehensive theory" model，and compared with safety production situation of foreign metal and nonmetal mines，the gaps were identified，some experiences were summed up，meanwhile the related prevention measures for accidents were put forward.
    Monitoring and Analysis of Impact of Blast Vibration on Ground Environment in Underground Mining
    YANG Kai, 吕Shu-Ran , DONG Hua-Xing
    2013, 42(10):  144-147. 
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    In the mining process，the majority of underground metal mines adopted explosive blasting.Seismic waves produced by blasting spread to the ground surface，which have an impact on the safety of the buildings and facilities on the ground.For this problem，the on-site monitoring of the impact of the stope blasting vibration on the ground environment is carried out，thus obtaining blasting vibration monitoring data.Peak particle velocity evaluation method is selected to analyze the impact of blasting vibration.By linear regression of the data using the least squares method，Sadov's Vibration Formula about underground stope is gained.Through the formula，blasting vibration velocity with different doses and different distances are predicted，and three parameters of vibration velocity and frequency，duration were compared with the corresponding data generated by train traffic vibration.Then，the dose control standards for stope blasting vibration are proposed.
    Study on Influence of Surface Dry-tailing Stacking to Underground Mining of Yuhuasi Mine
    LI Jun-Chao, XU Meng-Guo, GAN Shi-Wei, LUO Kai, YU Han
    2013, 42(10):  148-151. 
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    In order to find the influence of surface dry-tailing stacking to underground mining，a three-dimensional model for Yuhuasi Mining Area was established，and FLAC3D analysis software was used to simulate surface dry-tailing stacking.The results show that surface dry-tailing stacking has almost no effect on the stress and displacement of production level but a great impact on near-surface part.More attention on and effective measures for high stress area in hanging wall contact zone of rock and ore and two ends of ore-body trend need to be taken in this mining area to ensure normal production of the mine.
    Optimized Design of Load Reduction for North Dump of Xingshan Iron Mine
    SONG Zhi-Fei, XIN Xiao-Ping, SUN Shi-Guo, XU Xiu-Ming
    2013, 42(10):  152-154. 
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    In order to ensure the absolute safety of the bottom of northern Xingshan Iron Mine dump since below it there is an important industrial square nearby，it is necessary to make load reduction and to determine the optimal load shedding scheme.The slip field theory，the numerical simulation method and the limit equilibrium analysis method are applied to make the research and evaluation on the schemes，by which the optimal load shedding scheme is achieved.The stability conclusion under the normal condition and the saturation condition is obtained.The results show that the stability of dump increased significantly after load reduction.
    Operating Point Optimization and Effectiveness Analysis of Parallel Fan
    WANG Cong-Lu, WU Guo-Min, WANG Gen
    2013, 42(10):  155-157. 
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    Based on the mathematical model of parallel fan operating，the change law of equivalent wind resistance of parallel fan was analyzed.Condition of minimum fan total energy consumption can be drawn from the point of energy-saving.Taking the mine ventilation system of Tonglushan as an example，the operating point change law of parallel fan is studied.Studies show that: Selection of parallel fan needs to comprehensively consider the matching relationship among the air pressure，the air volume and the parallel fan;It is very difficult to control air volume in a mine ventilation system of parallel fan;The air door and air partition play an important role in air flow distribution.The key in routine ventilation management lies in the air door and the balanced demand air volume.
    Research on Leaching Rule of Heavy Metals in Mined Waste-rocks in Pansteel and its Impact on the Environment
    HU Ting-Xian, XU Zheng-Qi, SUN Jiao, ZHANG Xiang, WANG Peng-Chong, LI Ping
    2013, 42(10):  158-162. 
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    Through static leaching experiments, the leaching situation of four heavy metals V，Ti，Cr，Fe in waste-rocks during mining process of Pansteel under the conditions of different pH values and different immerse time was investigated.The results showed that: The leaching volume of V and Cr was overall increasing with the increase of pH value, but Fe leaching was just in reverse.Ti leaching was tiny in acidic and alkaline conditions.The leaching volumes of four heavy metals were changing irregularly with the extension of immerse time, but the reason for this needs further study.Heavy metals in high concentration in waste-rocks does not mean large leaching rate.The leaching intensity of four heavy metals all gradually decreases with the extension of immerse time.By judging its leaching strength, it is concluded that V and Ti owns an insoluble nature, Cr has a weak soluble-insoluble nature, and Fe has a moderate-strong soluble nature.Cr may harm to the environment, which needs to be monitored.The other three heavy metals have little effect on the environment.