Loading...
Welcome to Metal Mine! Today is Share:
×

扫码分享

Table of Content

    17 June 2013, Volume 42 Issue 06
    Previous Issue    Next Issue
    Computer Image Automatic Processing System for Fragmentation Distribution of Blasting Lumps and Rocks
    QU Shi-Jie, LIU Ji-Fei, XU Wen-Yao
    2013, 42(06):  1-4+37. 
    Asbtract ( 1335 )   PDF  
    Related Articles | Metrics
    The technology of “dual threshold point expansion and successive decrease circulation processing” is introduced into the computer image automatic processing system for fragmentation distribution of blasting lumps and rocks to make the image's binary processing.Based on the techniques of binary，twice denoising smooth of blasting lumps images are made，and the Laplace operator edge detection is used to determine the rock boundary.Cooperating with the regional growth method of monotonous links，the least distance segmentation method into regional segmentation is creatively proposed.The double logistic regression analysis on the processing results is carried out by using R-R function，acquiring the distribution results of blasting lumps and rocks.Test results show that the system has a high precision of measurement with the error of usually no more than 10%，which can meet the requirements of practical application，Also，This test method has a very good development prospect.
    Research of Failure Process of Rock under Biaxial Loading Based on Acoustic Emission Monitoring
    XU Shi-Da, JIANG Kun-Xu, LIN Jia
    2013, 42(06):  5-8+12. 
    Asbtract ( 1194 )   PDF  
    Related Articles | Metrics
    With the use of grained granite as samples，the acoustic emission technique was used to investigate AE characteristics in failure process of granite rock samples under biaxial loading condition by applying different lateral stress，and emphasized the relationship of compressive strength，acoustic emission activity and lateral pressure. The results showed that the lateral stress increases the vertical compressive strength. The critical lateral strain at the loading end is the key factor that the later stress affects the vertical compressive strength. When the critical lateral strain at the loading end turns positive that sample experiences tension in the direction，the lateral stress plays a positive role in the increase of vertical compressive strength，otherwise is negative. Also，the lateral stress impacts on the acoustic emission sequence obviously. When the lateral stress is low，few acoustic emission events occur during the initiation of rocks loading. But as a large amount of acoustic emission events occur near failure，the acoustic emission sequence before stress peak shows up as the unimodal type. When the lateral stress is high，even a small stress disturbance may induce the generation and expansion of cracks that results in the acoustic emission sequence showing up as the cluster type，that have a great significance to forecast the rock failure.
    Advance Pile-Shed Supporting of Roadway Drifting In a Bauxite Mine
    FU Zong-Zhi, CAO Ping
    2013, 42(06):  9-12. 
    Asbtract ( 1214 )   PDF  
    Related Articles | Metrics
    Engineering & Research Institute of Nonferrous Metallurgy，Aluminum Corporation of China During process of roadway drilling，excavation and construction in a bauxite mine，there usually meets with a fracture zone with an approximately 60 m wide fault.Since the surrounding rock has a poor self-stability ability，the improper construction would result in the roof caving and collapse，seriously influence the construction safety and schedule.The paper introduces in detail the design parameters and construction requirements of pile-shed supporting during the roadway tunneling.After experiencing over two months in this project，the tunnel successfully passed this fracture zone.The advance drilling at working face is adopted.Especially in the weak fracture zone，the small pile-shed supporting can ensure the roadway tunneling.
    Numerical Simulation Analysis of the Skarn Rock Tunnel Support
    WANG Ping, WANG Ming-Xu, XU Meng-Guo, GAN Shi-Wei, LI Jun-Chao, YU Han
    2013, 42(06):  13-15. 
    Asbtract ( 1048 )   PDF  
    Related Articles | Metrics
    Skarn has a strong hydraulic property.When skarn meets water，its mechanical properties change greatly，thus bringing adverse effect on the mine safety production.The numerical simulation of different tunnel support in skarn rocks for a iron mine is made by using numerical simulation software to explore the tunnel deformation and the variety of safety coefficient.Especially the shotcrete and bolt connecting chain support is introduced.Comparing and analyzing the numerical simulation data，it concludes that the shotcrete and bolt connecting chain supporting is the most favorable way to keep the stability of the tunnel.
    Analysis of the Stress Distribution and the Failure of the Floor under the Influence of Fault
    NIU Xin-Gang, MA Hai-Feng, LI Chuan-Ming, LI Jia-Zhuo, SHI Wen-Bao, ZHANG Yong-Jiang
    2013, 42(06):  16-19+48. 
    Asbtract ( 1550 )   PDF  
    Related Articles | Metrics
    The impact of the fault on the stress peak and the variation of plastic zone during coal bed mining was simulated by using FLAC5.02D numerical simulation software.Different fault dip，fault stiffness and the variations of the stress peak and the plastic zone under floor water pressure were analyzed.Meanwhile，according to the field measurement，the damage depth with or without fault is compared.The smaller the fault dip is，the higher the floor stress peak value and the larger the floor failure zone is.The larger the fault dip is，the smaller the damage zone is，eventually developing as “X”type.With the increase of the fault stiffness，it has no obvious influence on the floor plastic zone，but only improves water inrush channel from one side of the fault.With the increase of the floor water pressure，the plastic zone did not change significantly，and the volatility of the floor peak stress is not large.No fault exists，the floor failure depth is 0~17 m.The fault zone makes the floor failure depth increasing by 135%.
    Study on Application of Downward Two-step Drift Stoping with Upward Backfill
    LI Shi-Bo, LIU Feng-Tao, WANG Jing-Sheng
    2013, 42(06):  20-22. 
    Asbtract ( 1505 )   PDF  
    Related Articles | Metrics
    The upward drift stoping with backfill for instable rock mass in Nanren iron mines area was ineffective and unsafe.In view of this situation，based on the on-site inspection，test and numerical simulation，the downward two-step drift stoping with upward backfill method that keeps the roof area invariable was put forward.Combining of the optimization of roof support with hole-by-hole blasting，the on-site tests were carried out.The results indicated that this new method could simplify the construction process，improve the mining efficiency and the stoping safety.Therefore，it has demonstration significance for safely and effectively mining of instable broken rock mass in this district.
    Application of the Sublevel Upwards Filling Stoping with Rocks and Cemented Tailings to Guangshan Iron Mine
    HU Wei, ZHUANG Ming-Ying
    2013, 42(06):  23-24+28. 
    Asbtract ( 1334 )   PDF  
    Related Articles | Metrics
    The pillarless sublevel caving method is originally adopted in Guangshan Iron Mine.Because of poor stability of the ore，and seriously caving in mining roadway，the sublevel upwards filling stoping with rocks and cemented tailings has been applied in recent years，which can not only solve geological disasters and environmental issues caused by mining，but also effectively recover mineral resources.The mining recovery is increased from 70% to 93% and the dilution ratio decreased from 30% to 5% below.
    Effects of Open Pit Mine Explosive Vibration on the Stability of Constructions
    LIU Hong-Xing, QU Shi-Jie, HE Wen, DENG Fei
    2013, 42(06):  25-28. 
    Asbtract ( 1095 )   PDF  
    Related Articles | Metrics
    Experiments and numerical simulation were conducted to study the effect of explosive vibration on the stability of slope and civil constructions which are close to the open pit mine. Experiment results show that: under the current explosion vibration at open pit mine，the maximum three dimensional combined vibration velocity is much less than the allowable safety velocity，thus concluding that the explosive vibration has little effect on the stability of the civil construction. The simulation results have verified the conclusion. Meanwhile the maximum three dimensional combined vibration velocity of the slope is within the range of allowable safety velocity. The safety factors of the slope under explosive vibration ranged from 1.742 to 1.843 through numerical simulation method，indicating that the slope is in stable state under explosive vibration. With both the criterion of Safety Regulations for Blasting and the numerical simulation analysis，the stability of constructions can be effectively estimated.
    Experimental Research on Dewatering Technology of the Water and Tailings Filling Stope in Yingezhuang Gold Ore
    XIAO Gang, LI Shu-Peng, JIANG Lei, CAO Xian-Jin
    2013, 42(06):  29-30+34. 
    Asbtract ( 1221 )   PDF  
    Related Articles | Metrics
    This paper introduces the new dewatering cage's structure and filtering materials in Yingezhuang Gold Ore，and analyzes and calculates the pressure-bearing，filtering and tailings deposition of the dewatering cage.The field test shows that the filtered water from the dewatering cage contains less tailings with fine clay content of ≤ 0.5% after sampling and drying.The new dewatering cage has a good filtering effect under continuous filling conditions.
    Research on the Stability of Artificial Pillar with Similar Simulation Experiment
    XIANG You-Bing, TAN Wei, ZHAO Kang, WANG Xiao-Jun
    2013, 42(06):  31-34. 
    Asbtract ( 1108 )   PDF  
    Related Articles | Metrics
    In view of the instable roof resulted from the pillar recovery of the gold ore，and the insufficient recovery of the ore-body，the artificial pillar is adopted to support the roof instead of primary pillar.Through the similar simulation experiment research of primary pillar，it is demonstrated that the artificial pillar can replace the primary pillar for the fairly short ore-body.When the mining span is small，the cost of production can be saved by appropriately decreasing the size of artificial pillar.
    Stability Research of Rock Mechanics Grading for Broken Rocks in Jiaojia Gold Mine
    QIU Jun-Gang, ZHANG Hong-Xun, QIU Lin, ZHANG Qin-Li, PAN Pi-Ye
    2013, 42(06):  35-37. 
    Asbtract ( 1285 )   PDF  
    Related Articles | Metrics
    Through rock sampling at different geological regions in Jiaojia mine area of Jiaojia Gold Mine，laboratory experiments on rock mechanics are carried out to analyze the rock mechanics parameters.Then rocks are classified and contrasted by using the Q system classification method the RMR classification method and the BQ classification method to submit different rock mass grading.The stope safety production specification for different rocks is proposed，which has a positive effect on the production safety.
    Research and Application on Gob-side Entry Retaining Technology in Fully Mechanized Coal Face with Compound Roof
    ZHUANG You-Jun, LIU Han-Ci, ZHANG Shuai
    2013, 42(06):  38-41+52. 
    Asbtract ( 1195 )   PDF  
    Related Articles | Metrics
    The roadside support with gangue zone has advantages of less support materials consumption and good stability.And its disadvantages involve large set-back amount，small support resistance at the beginning，big roof subsidence and great labor intensity in building gangue zone.For the fully mechanized coal face of compound roof and thin seam，it is the key of the god-side entry retaining technology to effectively control the surrounding rock of the tunnel，especially the compound roof at the section of roadside filling.Combining with the numerical simulation software and the situation of the entry retaining，the stress and deformation of the surrounding rock after roadside filling with gangues are analyzed，and the influence of different gangue zones width to the gob-side entry retaining is simulated.Based on this condition，the gob-side entry retaining technology with roadside support of 3 m gangue zone is successful.
    On the Improvement of Underground Mining Methods for Small Limestone
    ZHANG Guo-Rong
    2013, 42(06):  42-45. 
    Asbtract ( 1245 )   PDF  
    Related Articles | Metrics
    To improve the underground mining methods for small-scale limestone mine，and combining with the actual condition of 22 underground limestone mines in Xinluo mining area，the factors for affecting the selection of the underground mining methods for limestone mine are analyzed. Based on the current situation of small underground limestone mine and its existing problems in Xinluo mining area，how to improve the mining methods for small-scale limestone mines is investigated. It is concluded that it is the best choice to take one step mining without pillar recovery，and the mining-out area must be avoided or supported with artificial pillars. The shrinkage method instead of the room-pillar method，will improve the recovery rate from 30% to 40%~55% for small underground limestone mines.
    Application of Rock-clay Cementing Backfill System in Baoshan Mine and its Cost Analysis
    YUAN Mei-Fang
    2013, 42(06):  46-48. 
    Asbtract ( 1127 )   PDF  
    Related Articles | Metrics
    This paper establishes the rock-clay cementing and pumping backfill system combining with the actual situation in Baoshan mine.Seven of more than thirty groups of rock-clay cementing and pumping backfill materials are selected to make the strength test.Under the premise of meeting requirements on the mining process，pumpability and fill-body strength，yellow mud is adopted to replace 32% of the cement，with the final strength only decreasing 0.65 MPa （9.7%） and filling cost savings of 23.78 yuan/m3.
    Research and Realization of Small Software for Calculation of Earthwork in Site Leveling Based on Java 3D
    WANG Xin-Sheng, MA Hai-Tao, NING Hua-Zhan
    2013, 42(06):  49-52. 
    Asbtract ( 1528 )   PDF  
    Related Articles | Metrics
    The paper discusses the thought of the two algorithms for calculation of earthwork in site leveling with the section method and the Delaunay triangulation method，and mainly focuses on the triangle in Delaunay triangulation algorithm to calculate earthwork.First of all，according to the elevation of the three vertices of each triangle in the Delaunay triangulation，it is to determine filling，cutting or the joint of filling and cutting in this triangle area.Then，the appropriate algorithm is adopted to calculate the filling-cut volume in the triangle area.Finally，small software for calculation of earthwork in site leveling is developed with Java 3D programming language.The cases confirmed that the algorithm used in this software is correct and effective.
    Analysis on the Origin of the Stepwise Reduction Sequence of Fe2O3
    BU Lin-Chao-Ke, GUO Ting, ZHANG Bang-Wen, XING Rui-Guang, ZHANG Qi-Wei, ZHANG Yin
    2013, 42(06):  53-57+92. 
    Asbtract ( 1588 )   PDF  
    Related Articles | Metrics
    More reasonable expressions for standard molar Gibbs free energy change of iron oxides reductions were obtained through conducting analysis on the decomposition thermodynamics of iron oxides，as well as on the correlation between decomposition thermodynamics and reduction thermodynamics，whereby the origin of the stepwise reduction sequence of Fe2O3 were revealed. The analysis showed that the stepwise reduction sequence of Fe2O3 stems from its decomposition sequence. The rules of the decomposition thermodynamics of iron oxides are completely parallel to its reduction thermodynamics. With 570 ℃ as the boundary temperature，the molar Gibbs free energy change of the iron oxides reductions varies in their magnitude sequence，resulting in the change of the coupling pattern of the reactions，and subsequently leads to the two different stepwise reduction sequences for Fe2O3，and two different reduction modes for Fe2O3.
    Study on the Direct-reverse Flotation Technology of Moderate Grade of Collophanite Ore from Yunan
    ZHOU Xin-Jun, QIN Lei, HU Miao, ZHANG Xiao-Zhou
    2013, 42(06):  58-60+66. 
    Asbtract ( 1102 )   PDF  
    Related Articles | Metrics
    A moderate grade of collophanite ore in Yunnan belongs to the typical silicate-calcareous phosphorite. In order to provide the basis for development and utilization of the ore，beneficiation tests were carried out by direct and reserve flotation. The results showed that under rod grinding fineness of -0.074 mm 87.72%，phosphorus concentrate with P2O5 grade of 30.22%，MgO content of 0.71%，P2O5 recovery of 83.72% was gained by the process of direct flotation with one rouging，one cleaning and one scavenging，and reserve flotation with one-roughing and one scavenging. The product quality reaches the first-class standard of phosphate ore for the acidic processing.
    Beneficiation Experiments of the Mixed Ore at No.Ⅰ Orebody of Yulong Copper Mine
    GUO Wen-Peng, CHEN Fei, CHEN Yi-Feng, LI Wen-Juan, CAI Liao-Lu, SONG Yong-Sheng
    2013, 42(06):  61-66. 
    Asbtract ( 1363 )   PDF  
    Related Articles | Metrics
    In order to provide the basis for the development of No.Ⅰore-body of Tibet Yulong Copper Mine，beneficiation tests on the mixed ore from each ore belt at this deposit are carried out. Aiming at the feature of copper associated with molybdenum in the ore，among which copper exists in form of copper sulfide and oxidized copper，and molybdenum mainly exists in form of molybdenum sulfide，total copper concentrate with Cu grade of 18.13% and Cu recovery of 79.31%，and molybdenum concentrate with Mo grade of 45.97%，and Mo recovery of 79.39% were finally gained by the process of bulk flotation of copper sulfide and molybdenum sulfide-separating flotation，bulk flotation of tailings and then the flotation of copper oxide.
    Experimental Research on Beneficiation of a Certain Muscovite in Henan
    LU Kang, ZHANG Ling-Yan, ZHANG Dan-Ping, HU Lin-Qiang, GUAN Jun-Fang
    2013, 42(06):  67-70+74. 
    Asbtract ( 1185 )   PDF  
    Related Articles | Metrics
    In order to provide the basis for development and utilization of a certain muscovite in Henan，beneficiation tests of the ore were carried out. The results showed that under grinding fineness of -0.074 mm 50.20%，iron-containing impurities including biotite，magnetite，hematite，limonite and tourmaline were firstly removed by using the high gradient high intensity magnetic separation. Then，under the acidic condition of pH=3，muscovite，quartz and feldspar were separated by using dodecylamine. Finally，muscovite concentrate with muscovite content of 91%，muscovite recovery of 70.75%，Fe2O3 content of 5.10% was obtained，which can meet the requirements of rubber filler in industry.
    Floatability Performance of Magnesite and its Associated Minerals in Sodium Oleate and Lauryl Amine Flotation System
    YAO Jin, YIN Wan-Zhong, WANG Yu-Lian, ZHANG Li-Li, HOU Ying, MA Ying-Qiang
    2013, 42(06):  71-74. 
    Asbtract ( 1366 )   PDF  
    Related Articles | Metrics
    In order to provide a reference for beneficiation and purification of the low-grade magnesite ore，the single mineral flotation tests are made to investigate the influences of inhibitor sodium oleate and the dosage of lauryl amine，pulp pH value and regulators sodium hexametaphosphate and sodium silicate on floatability of magnesite and its associated minerals including dolomite，serpentine，talc and quartz. According to the results，the content of impurities associated minerals among magnesite ore were effectively reduced by firstly removing quartz，talc and part of dolomite with the reverse flotation of lauryl amine under the natural pH conditions and then separating serpentine and remained dolomite from magnesite with direct flotation of sodium oleate under pH value 11 and adding the appropriate amount of sodium hexametaphosphate.
    Beneficiation Tests of a Low-grade Carbon-bearing Lead-Zinc Sulfide Ore of Inner Mongolia
    ZHANG De-Wen, WU Luan-Dong, QIU Ting-Sheng, LI Xiao-Bo, LIN De-Cai
    2013, 42(06):  75-79+83. 
    Asbtract ( 1341 )   PDF  
    Related Articles | Metrics
    In view of high content of organic carbon even existing in aphanitic form and fine dissemination size of lead-zinc sulfide ore，beneficiation tests on the ore is carried out by the process of pre-flotation decarbonization after grinding-Pb-Zn-S sequential flotation-regrinding of lead and zinc coarse concentrate for cleaning concentration，and adding high efficient inhibitor of carbon called iron-chromium lignosulfonate in the lead cleaning process. Through the process above，lead concentrate with Pb grade of 53.67 % and Pb recovery of 56.93%，zinc concentrate with Zn grade of 44.64% and zinc recovery of 83.19%，and sulfur concentrate with S grade of 36.89% and sulfur recovery of 59.11% was obtained separately，thus providing a basis for the development of the ore.
    Removal of Sodium Oleate from Simulated Zinc Lixivium by Air Flotation
    欧Le-Ming , QIN Da-Mei, WAN Li, FENG Qi-Ming
    2013, 42(06):  80-83. 
    Asbtract ( 1156 )   PDF  
    Related Articles | Metrics
    In order to provide a reference to the purification of remove the organic impurities from zinc lixivium by air flotation，the experiments on the simulated zinc lixivium with Zn2+ concentrate of 45 g/L，sodium oleate concentrate of 2×10-4 mol/L and pH value of 5.1 were carried out with the flotation column of φ35 mm×200 mm. The effects of flotation time，thickness of froth layer，superficial gas velocity on purification were investigated through single factor experiments and orthogonality experiments. The results showed that under conditions of the flotation time for 6 min，thickness of the froth layer of 1 cm and superficial gas velocity at 0.096 cm/s，the removal rate of sodium oleate was up to 91.69%，and the retention rate of Zn2+ reached 92.94%. Among these three factors，the air flotation time have the most significant influence on the removal rate，followed by the superficial gas velocity，and the thickness of the froth layer was relatively the least.
    Application Study of a New Type Jig Bed Made of Iron Base Composite Material
    HUANG Run-Zhi, CHEN Jian-Hua, CHEN Jian-Ming, YANG Lin-Yuan
    2013, 42(06):  84-86+89. 
    Asbtract ( 1564 )   PDF  
    Related Articles | Metrics
    In view of the shortcomings of low density，unequal particle，irregular sharp，and easy-to-wear of the traditional natural sulfide ore jig bed in dressing plant of China Tin Group Co.，Ltd.，a new type of jig bed made of iron base composite material was developed，and the related industrial application tests were conducted based on the laboratory tests. The industrial application tests indicated that compared with the natural sulfide ore jig bed，the new type of jig beds increased the wastes removal rate by 19.04%，increased the grades of tin，lead and zinc by 0.34%，0.09% and 0.96% respectively，decreased the loss rate of tin，lead and zinc by 5.74%，7.13% and 6.05% and increased the tin concentration ratio by 0.83%. All these fully prove the advantages of the new jig bed in performance.
    Application of High Density Resistivity Method to the Survey of Geologic Disasters in Mine
    LI Bin, TUO Xian-Guo, ZHANG Geng, WANG Kai-Yang
    2013, 42(06):  87-89. 
    Asbtract ( 1031 )   PDF  
    Related Articles | Metrics
    Based on the high density resistivity method which is widely used in engineering survey，this paper used a special auxiliary grounding device to solve the ground obstacles of this method in the bedrock exposed area of the mine，and then this device has been applied to detect a known fault and an underground mined-out area in mining area.The interpretation results from the data show that high density resistivity method is feasible and efficient in finishing this type of survey.
    Application of Shallow Drilling X-ray Fluorescence Measurement in Aeromagnetic Anomaly Inspection
    YANG Hai, GE Liang-Quan, XIONG Sheng-Qing, GU Yi, ZHANG Qing-Xian
    2013, 42(06):  90-92. 
    Asbtract ( 1260 )   PDF  
    Related Articles | Metrics
    Since the one-man back rig is simple and portable，it has a low requirement of the terrain and makes the field X-ray fluorescence measurement be on-site，rapid and low cost.The profile survey of the mineralized area is made by field X-ray fluorescence analysis during the process of aeromagnetic anomaly inspection in west Tianshan，obtaining the mineralization information under the surface of 4 to 5 m.Unlike the traditional investigation pit，it is not only more efficient and economic without heavy workload，but also able to gain deeper mineralization information.An efficient and portable exploration method is provided for tracking and evaluating the ore-caused anomalies which are detected in the field work.
    Characteristics of Ore-forming Fluids and Forming Mechanism of Yuanzhuding Cu-Mo Ore Deposit
    CHU Ke-Lei, YU Chang-Fa, LIN Liang-Zhuang, LIN Xiu-Guang
    2013, 42(06):  93-95+103. 
    Asbtract ( 1064 )   PDF  
    Related Articles | Metrics
    Through the detailed observation of the geological characteristics of Yuanzhuding porphyry Cu-Mo deposit，and combining with the tests on the inclusions at each stage and H，O isotope，it is considered that the ore-forming fluids mainly come from the magma，and are mixed with small amounts of atmospheric precipitation.In Yuanzhuding deposit，the occurrence and its ore-forming mechanism of molybdenite are different from that of chalcopyrite.Molybdenite is mainly from the porphyry ore-body，and the atmospheric precipitation as well as the K-metasomation is the main reason for molybdenite precipitation.While chalcopyrite should be the product under the metasomatism of ore-forming fluids with surrounding rock for a long period of time.
    Development and Application of Mine Tailings Identification System Based on IDL
    CHANG Rui-Chun, CUI Zhi-Yi, WANG Mao-Zhi
    2013, 42(06):  96-99. 
    Asbtract ( 1313 )   PDF  
    Related Articles | Metrics
    The paper describes the key technologies (spectral characteristics analysis，image mask，mine tailings identification and distribution)，system flows and framework design of “the Hyperspectral Mine Tailings Identification and Distribution System” based on the IDL language，and discusses the design ideas of the system for the industrial applications in detail.With the aims for the hyperspectral mine tailings identification and distribution，the system is divided into four functional modules: the spectral characteristics analysis of remote sensing imagine，remote sensing image mask processing and mine tailings identify and distribution.And experiments are conducted in Dexing Copper Mine in the northeast of Jiangxi to get the mine tailings maps in the experimental area.Compared with the actual mine tailings distribution，the experiments proved that the system is feasible and practical.Meanwhile，the existing problems in the system are discussed as well.
    GPS Displacement Monitoring System for Tailings Dam of Tongxin Mining Industry Co.，Ltd.
    ZHOU Yu-Xin, XIANG Hong-Hai, WANG Bin
    2013, 42(06):  100-103. 
    Asbtract ( 1160 )   PDF  
    Related Articles | Metrics
    At current，there is mostly manual monitoring at tailings dam displacement monitoring.Its monitoring frequency and accuracy are difficult to meet the needs for the safety production and management of tailings pond.According to the specific situations of tailing dam in Tongxin Mining Industry Co.，Ltd.，the GPS displacement monitoring system is designed and installed for the tailing dams.From the analysis on tests data，it concludes that the data dispersion control of the system is good，and its maximum displacement is controlled within the limited range of accuracy.The system can fully reach the desired accuracy.
    Application of Coupling Connection in the Large Diameter High Pressure Seamless Steel Pipe of the Shaft
    TANG Xiao-Lin
    2013, 42(06):  104-105. 
    Asbtract ( 1261 )   PDF  
    Related Articles | Metrics
    A new coupling connection method is adopted in the tube installment of Zambia KONKOLA mine，rather than the traditional flanged or welded casing，or the quick joint method. The application of this new process provides a technical guarantee for the high-quality installment of large diameter high pressure seamless steel tube for the shaft.
    Installment of Steel Structure Facilities of Vertical Water Sump
    ZHANG Li-Yong
    2013, 42(06):  106-108. 
    Asbtract ( 1312 )   PDF  
    Related Articles | Metrics
    The paper introduces the installment conditions of steel structure facilities of vertical sump in KDMP 985m pump house project of Zambia KONKOLA Copper Mine. Due to adopting the reasonable construction scheme，method and procedures and effective and safe technical measures，the engineering accident is avoided，and the construction period is also shortened，realizing the safe，high-quality，rapid construction.
    Tests of the Temperature Gradient of Surrounding Rockmass and Analysis of the
    ZHAO Xing-Dong, XIU Guo-Lin, YANG Zhu-Zhou, HUA Hai-Yang, LIU Zi-Cheng, LI Wei
    2013, 42(06):  109-113. 
    Asbtract ( 1119 )   PDF  
    Related Articles | Metrics
    The engineering thermal and humid condition has been investigated to find out the basic reason of heat hazard at Sanshandao Gold Mine. According to the field investigation result of thermal circumstance，the position of surveying surrounding rockmass temperature is designed. Through the temperature curve regression at corresponding location of different middles，the normal surrounding rock temperature gradient is obtained as 2.2×10-2℃/m，and the geothermal gradient at underground geothermal area is 2.6×10-2℃/m. According to the analysis of different thermal resources，rockmass heat dissipation，equipment，air compression and geothermal resource are the main reasons leading to the temperature increasing at Sanshandao Gold Mine. The research provides a basic data for heat hazard analysis and its governance.
    Study on the Layer Interface Friction Strength Characteristics of Tailings Geotextiles Woven Bags
    ZHU Jun-Xing, ZHANG Mo, CAO Zuo-Zhong, LI Dong
    2013, 42(06):  114-117. 
    Asbtract ( 1493 )   PDF  
    Related Articles | Metrics
    In recent years，the tailings dry stockpiling technology was gradually popularized and applied.Compared with the traditional tailings stockpiling technology，the dry stockpiling technique can reduce water content in tailings，increase the mechanical parameters of tailings，and improve the overall stability of tailings pond.In the new technology of tailings dry stockpiling with filling of large geotextile woven bag，the interface frictional strength between layers of geotextile woven bag is the main indicator which influences and determines the stability of the entire tailings dry stockpiling.According to the easy production processing of large-scale geotechnical “resembling direct shear apparatus”，tailings geotextile woven friction shear strength test under different moisture content and normal pressure is carried out，drawing the relationship curve between interface friction coefficient and shear strength of the tailings layer of geotextile fabric woven bags，simultaneously the linear fitting friction and shear strength equation is in line with the Mohr-Coulomb criterion.The shear strength equation can reflect the physical-mechanical parameters and deformation characteristics of the geotextile layer interface friction，to provide the basis for the stability calculations of dry stockpiling damming with tailings geotextile woven bags.
    Reform on Ventilation System of Xishimen Iron Mine
    LU Jie, JIANG Zhong-An, NIU Wei, QI Jian-Dong, ZHANG Fa-Sheng
    2013, 42(06):  118-120+125. 
    Asbtract ( 1037 )   PDF  
    Related Articles | Metrics
    The returning air shaft in north of Xishimen iron mine has collapsed，the ventilation roadways in the central part have been destructed，and all original ventilation roadway at the middle section from 40m to 80m in the south of the mine have been totally destroyed，resulting that the ventilation system in each district became worse and worse. The poor ventilation system and the smoke generated by bombing threaten the life and health of the staff and also seriously influence to the safety production of the mine. Based on the exact measurement of the wind pressure，wind speed，temperature and humidity of the ventilation system of the underground mine and its roadway parameters，the ventilation status quo of the iron ore is specifically analyzed and the diagram of ventilation system and ventilation network are drawn to calculate the ventilation parameters and to determine the ventilation reforming program. The reforming program is based on the actual conditions of current mining activities and roadway layout in Xishimen Iron Mine. At the same time，the reforming program takes full consideration of the deep tunnel planning，and facilitates to joint the deep ventilation program with the current ventilation program together. It involves the factors of roadway layout，ventilation systems，ventilation facilities and equipment，the mining conditions，tunneling，the planning of overall mine，the exploitation plan and the relay planning etc.
    3D Dynamic Stability Analysis of the Tailing Dam under Earthquake Action
    ZHANG Li-Ting, LU Zhi-南, LI Qiang, ZHANG Jun
    2013, 42(06):  121-125. 
    Asbtract ( 1039 )   PDF  
    Related Articles | Metrics
    Based on secondary development of abaqus with the application of Fortran language，the Duncan E-υ model and the equivalent viscoelastic Umat subroutine are prepared. The 3D dynamic response and liquefaction analysis of tailings dam are made by the effective stress method. The acceleration，dynamic shear stress，the trend of the dynamic pore pressure and liquefaction zone of the Beipiao tailings dam in Liaoning province under normal conditions are calculated. The result of the dynamic computation shows that the magnification factor of along dam axis direction acceleration is 1.82 and the maximum values is on the slope surface of the embankment of 3/4 height of the dam; the maximum dynamic shear stress，which shows layered distribution，decreases gradually from the inside slope to the outside slope; dynamic pore pressure increases as irregular curve patterns，in the 2～6 s meizoseismal area undulated greatly，then leveled off. The liquefaction zone is mainly concentrated in the deposited beach shallow area and following the top of the dam infiltration，and not through the dam.
    New Process of Treating Wastewater from Lead-Zinc Concentrator of Jindong Mining Company
    WANG Zhi-Gang, CHEN Xiang-Xiang, ZHANG Yi-Wei, HAN Hui-Li, LIU Shu-Zhong
    2013, 42(06):  126-128+133. 
    Asbtract ( 1328 )   PDF  
    Related Articles | Metrics
    In order to better solve the problem of treating and recycling of wastewater from lead-zinc concentrator in Meixian Beneficiation Plant of Fujian Jindong Mining Co.，Ltd.，and based on analyzing the disadvantages of the former PAM wastewater treatment process，laboratory tests and industrial test on the new JCSS process were made. The effect of the recycled wastewater on the lead-zinc flotation was investigated. The results showed that the recycled wastewater treated with JCSS process could make the content of CODCr and Cu2+，Pb2+，Zn2+ greatly lower than the requirement of the reuse water. The recycled wastewater with JCSS process did not affect the index in beneficiation production. Furthermore，the running costs of JCSS process are lower than that of the former PAM about 1.484 yuan/t. According to the test results above，Meixian Beneficiation Plant decides to adopt JCSS process instead of the former PAM process.
    Study on Application of Cooling and Ventilation Technology in Deep Well of Gold Mine
    LIU Duo-Wen, LI Xu-Sheng, HAN Zong-Xin, ZHAO Zhen-Peng, SHI Lu-Bing
    2013, 42(06):  129-133. 
    Asbtract ( 1001 )   PDF  
    Related Articles | Metrics
    The actual situation of high temperature and high humidity in deep well of gold mine is comprehensively analyzed.With use of modern scientific methods，such as theoretical analysis，numerical simulation and field tests etc，and combining with the present situation of ventilation in mines，the deep well cooling technology with water source heat pump is studied and applied，achieving re-utilization of mine waste water.Its temperature，humidity and air flow can meet the requirement of the regulations and the need of production.This research provides a beneficial reference for similar mines.
    Research of Treatment and Comprehensive Utilization of Open Pits
    LIAN Jie, ZHENG Mao-Xing, WU Fei, LI Yun-Yun
    2013, 42(06):  134-137. 
    Asbtract ( 1261 )   PDF  
    Related Articles | Metrics
    In order to treat the open pit properly and efficiently，and to avoid various hazards，the techniques on treatment and comprehensive utilization of open pits are studied.According to the impacts of open pits on surrounding structures or buildings，open pits are classified into different categories，and the main hazards of open pits are analyzed.For different open pits in different areas，different measures on treatment and comprehensive utilization of open pits are put forwards.Meanwhile，the features and application conditions of the measure are exposited.In addition，taking the actual project as a case，the paper demonstrates the application of the measures.The research result enriches and develops the related theories of open pit treatment，and also it provides a good reference for the actual open pit treatment in different conditions.
    Research on Optimal Effect Simulation of Ventilation System in Yushiwa Iron Mine
    YANG Li, DING Wei, TAN Cong
    2013, 42(06):  138-142. 
    Asbtract ( 1139 )   PDF  
    Related Articles | Metrics
    Taking 22# stope as the research background，and on the basis of the gas movement and the solution theory，the computational fluid mechanics FLUENT model is used to make an effect simulation and reverse air simulation on the optimal scheme of 22# stope.Then，according to the contrasts of the simulation air volume with the designed air volume，the common air ventilation，and the reverse air volume，the air speed and volume at the section of each survey point are analyzed with the purpose of grasping the influence area and the ventilation condition，air direction，air volume and its stability in the reversed air situation.The simulation result and the design result are consistent with each other .In reverses air conditions，the air volume at each main return air-way can reach 60% of the air volume at the normal situation of the fan.And according to the actual condition，the air backing at the main return air-way can be realized within 10 min.The research indicated that this ventilating proposal is feasible and effective，and the ventilating circuit，direction and air volume can meet the design requirements.Meanwhile，when the fan is reversed，the air backing effect can also meet the requirements.
    Advances and Challenges in Water Chlorophyll-a Monitoring by Hyperspectral Remote Sensing in a Coal Mine Subsidence Area
    LIN Li-Xin, WANG Yun-Jia, XIONG Ji-Bing
    2013, 42(06):  143-147+150. 
    Asbtract ( 1103 )   PDF  
    Related Articles | Metrics
    Monitoring on the spatial and temporal distribution of chlorophyll a in coal mine subsidence area is always weak and difficult.Hyperspectral remote sensing technique offers timely，up-to-date，and highly accurate information for sustainable and effective management of this special water area.An overview is provided on the achievements of Hyperspectral RS applications in monitoring water chlorophyll-a and concludes the challenges of using this technique into coal mine subsidence area.And then，the main challenges are analyzed and some prospects about further studies are inferred.
    Research on Source and Composition of the Toxic and Harmful Gas and its Influence Factor in a Certain Gold Deposit
    ZHENG Jian-Jun, WANG Wei-Zhong, REN Zhong-Han, ZHOU Qi-Ming, CAO Shan-Zhong
    2013, 42(06):  148-150. 
    Asbtract ( 1584 )   PDF  
    Related Articles | Metrics
    The toxic and harmful gas is one of the main risk sources of gold mine. Through investigation，study and field measurement in a certain gold deposit，the composition of toxic and harmful gas is the oxides of C，N，S which mainly come from blasting fume and tail gas from trackless equipment. Their influence factors are different at different locations. The intercepted blasting fume releases slowly and results into high concentration of harmful gas within a short time in stope and tunneling. Due to numerous trackless equipment in transport roadway and ramps，the concentration of harmful gas is mainly affected by the quantity of trackless equipment，the total power of internal combustion engine，and ventilation volume. Among these，the concentration of CO has a great relationship with the ventilation volume.
    Research of the Mine Mobile Refuge Cabin and the Simulation of Underground Space Environment
    YOU Bo
    2013, 42(06):  151-154. 
    Asbtract ( 1392 )   PDF  
    Related Articles | Metrics
    The working environment of underground mine in China was reviewed，and the design principles of mine mobile refuge cabin was discussed，including the researches of oxygen system，monitoring system，the disposing of harmful gas，thermal insulation，pressure system，electromagnetic interference etc.Based on its own function of the mine mobile refuge cabin，the simulation conditions of underground space environment were putted forward，thus providing an experimental base for artificial intelligence simulation.
    The Seepage Calculation and the Drainage Design of Tailings Dam
    JIN Jia-Xu, LIANG Li, CHEN Tian-Yu, XU Hong-Da, DONG Tian-Wen
    2013, 42(06):  155-157. 
    Asbtract ( 1272 )   PDF  
    Related Articles | Metrics
    The seepage stability is the important factor which impacts the safety and stability of the tailings dam，and the position of the saturation line directly affects the safety and stability of the tailings dam.Taking the concrete tailings dam for example，and based on the measured data on drilling，the suitable calculation parameter and boundary condition are chosen to build a reasonable calculation model to analyze the seepage situation of the tailings dam when the drainage facility is normal or damaged.The conclusion is that the permeability of the primary dam has a close relationship with the seepage stability of the tailings dam.When the impermeable layer of the primary dam is blocked，the permeability at exit is reduced and the saturation line of the dam rises，and even the water may exude from the dam slope.The seepage scheme with the local horizontal holes can effectively reduce the saturation line and ensure the safety of the dam.
    Extraction of Pavement Cracks in Mining Area based on Point Cloud Data
    AO Jian-Feng, ZHOU Ming, XU Ya-Nan, YU Hai-Xia
    2013, 42(06):  158-160. 
    Asbtract ( 1106 )   PDF  
    Related Articles | Metrics
    The pavement cracks resulted from the surface subsidence in underground mining is one of the common damages to underground mining.First of all，according to the data acquisition mode by the terrestrial 3D laser scanner，the scan data is decomposed based on the scan lines，and pavement cracks information contained in each scan line is obtained by using wavelet transform with good detection function on signal mutations，which realizes good detection effect.
    Separation Experiment of Kaolin Tailing Quartz Sand in Guangxi Beihai
    LIU Si, GAO Hui-Min, HU Ting-Hai, GUAN Jun-Fang, JIN Jun-Xun, REN Zi-Jie
    2013, 42(06):  161-164+167. 
    Asbtract ( 1495 )   PDF  
    Related Articles | Metrics
    More than 95% of minerals in a Beihai kaolin tailing in Guangxi is quartz. In order to provide the basis for improving high added value of tailings，and based on the process mineralogy research，beneficiation tests for purification of quarts sands are carried out by the process of scrubbing-classification-rod mill-grading-high gradient high intensity magnetic separation-reverse flotation-acid scrubbing. Through this process，high whithness quartz sands with the particle size of 0.6~0.1 mm，SiO2 content of up to 99.91%，Fe2O3 content of 79.88 μg/g were gained. Combining with the benefinicaiton tests and the process mineralogy research，the process of both producing high-whithness quartz sand and the byproducts of ceramic materials，ordinary quartz sand，kaolin and others is recommanded for the actual production in future.
    Influences of the Particle Size Distribution on the Cementing Properties of Steel Slag Cement
    YI Long-Sheng, WEN Jian, WANG Zhou, WAN Lei
    2013, 42(06):  165-167. 
    Asbtract ( 1081 )   PDF  
    Related Articles | Metrics
    In order to provide guidance for optimizing the particle distribution of steel slag powder in steel slag cement，the particle size characteristics of the steel slag powder and the corresponding cementing performance of the steel slag cement under different grinding time are studied. Then，the gray relational analysis method is used to calculate the correlation of the slag powder with various size and the slag cement mortar strength. The results showed that: with the milling time prolongs，the specific surface area of slag is increased and its activity is enhanced，thus resulting that the slag cement mortar strength and the bending strength have been improved. Slag powder particles smaller than 20 μm，especially 10 ~ 20 μm grain size play a catalytic role in the strength of slag cement mortar. That greater than 20 μm play an inhibiting role in the strength of slag cement mortar. In order to make slag cement owning better gelling properties，how to improve the content of -20 μm particles，especially 10 ~ 20 μm grain，while reduce +20 μm grains should be considered.