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Table of Content

    08 July 2011, Volume 40 Issue 07
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    Study on Smooth transition Production in Transition from Surface to Underground Mining at E Kou Iron Mine
    DAI Bi-Bo, CHEN Shun-Yu, SUN Li-Jun, LI He-Lin
    2011, 40(07):  1-7. 
    Asbtract ( 1933 )  
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    The output connection in transitional period was one of the key technical difficulties during the transition from open-pit to underground mining.Taking E'kou Iron Mine as a case，two proposals for the smooth transition were given based on the comprehensive analysis of the mine resources，opencast production status，opencast stripping schedule and underground mining district.One was the underground output production with the aid of open-pit production，and the other was open-pit production with the aid of underground production.These two proposals were applied to the mine to obtain the most realistic programs for smooth transition.
    Research on Safety and Stability of Phosphorite Ore Pillar Replacement
    CHAI Xiu-Wei, ZHANG Dian-Ji, ZHOU Lin, YU Lian-San, CUI Zheng-Rong
    2011, 40(07):  8-11. 
    Asbtract ( 1917 )  
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    The rational span size of Zhangcunping mining is determined by the rock beam thoery analysis and the finite element calculation.Through the comparation of the compression strength between ore pillar and the C20 concrete artifical pillar，under the condition of 120m thick of cover rock，the size of C20 concrete artifical pillar greater than 5 m×5 m could make the safety factor of concrete pillar reach the number 1.0，which shows the replace of ore pillar by C20 concrete artifical pillar is feasible and could fulfill with the safety and stability during the recovery work of ore pillar，then can obtain the great economic benefit.
    Study on the Resistance Loss of Hydraulic Transport for Coarse Particles in Horizontal Pipeline
    YE Jian, XIA Jian-Xin, Malczewska Beata
    2011, 40(07):  12-18. 
    Asbtract ( 2594 )  
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    Taking the solid-liquid phase flow pipeline transport technology of deep-sea mining as the applied background，the law of resistance loss changing in horizontal pipeline under conditions of different particle size，volume and concentration，and conveying velocity were investigated by building the simulation system of hydraulic pipeline transport.The results showed that the higher volume concentration or the greater transportation velocity is，the more resistance loss would be.The relationships between the resistance loss and each parameter are as following.If other conditions stay the same，there is the exponential relationship between the resistance loss and the concentration or the velocity.Particle's movement has a certain effect on the rate of resistance changing.Based on the experimental data and the theoretical analysis，the formula for calculating the resistance loss was proposed.
    Optimal Selection of Mining Method of Transition from Open-pit to Underground Mining in Shirengou
    YANG Li, WANG Xin-Min, ZHAO Jian-Wen
    2011, 40(07):  19-23. 
    Asbtract ( 2005 )  
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    Based on the specific mining environment of the transition from open-pit to underground in Shirengou mining model，the AHP and the Fuzzy mathematics methods fundamental theory were used to make a synthetic assessment.During this process，lots of dynamic and static，fix and non-fix quantified influence factors working on the mining method were taken into synthetic account，such as the technical and economic factors and degree of slope stability etc.The influence factor indexes of the mining methods were transformed into the matrix of the membership degrees；the weight of the influence factors matrix was established according to the AHP method.With the weights matrix and the matrix of the membership degrees，the Fuzzy synthetic judge model was established，and the synthetic superior degree of the mining methods based on the influence factors was got by the numeration with the Fuzzy mathematics methods，so the third mining model comes to the first place.
    Current Situation for and Existing Problems in the Reaction-Diffusion and Evolution of Pore Structure of Ores
    JIANG Yuan-Yong, XU Zeng-He
    2011, 40(07):  24-27. 
    Asbtract ( 1794 )  
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    Considering the superiority of solution mining and its application potentiality， the paper describes the reaction-diffusion and the evolution process of pore structure in ores fissure system in mineral leaching process.Through analyzing the current research progresses at home and abroad， it is pointed out that the reaction-diffusion has a close and interactive relationship with the evolution of pore structure.The present research findings can't be applied directly， so that some new ideas are raised to research such issue further.
    Study on the Numerical Simulation of Bolting Shotcrete Net Support of Powder Ores' Rock Tunnel
    CHEN Jin-Ping, SHENG Jian-Long
    2011, 40(07):  28-31+35. 
    Asbtract ( 2312 )  
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    According to the wall-rock supporting features and wall-rock deformation mechanism of powder ores' rock tunnel in Jinshandian Iron Mine，the numerical simulation on the wall-rock surroundings is made.And the poyting-thomson constitutive model is defined based on FLAC3D background.Through the contrast and summary on the bolting shotcrete support schemes that are initially designed，the optimal supporting proposal is obtained through the adjusting supporting parameters.This method can be applied in the other mining tunnel to select the appropriate supporting and then to be improved.It has advantages of low-cost，simplicity，high capacity of post-processing.
    Numerical Simulation of the Impact of Excavation on Stability of Rock Slope
    ZHAO Hong-Bao, PAN Wei-Dong
    2011, 40(07):  32-35. 
    Asbtract ( 1957 )  
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    Taking rock slope formed in the process of excavation in the west as project background，the numerical simulation on the law of stress evolution and deformation on the excavating direction of rock slope was carried out by numerical simulation software- FLAC3D.The results showed that the stress of rock slope formed by excavation was significantly reduced in the process of open excavation，showing like “W” from up to down，and tensile stress zone was formed in the middle of model，which was one of key reasons that caused rock slope failure.Significant expansion deformation of rock slope appeared in the process of excavation，and it was bigger as the increase of depth.The deformation along the direction of excavation at foot of the rock slope was maximum because of the rule of complicated stress evolution.
    Application Study of Pillarless Sublevel Caving Method in Transition from Open Pit to Underground Mining
    SONG Hua, REN Gao-Feng, REN Shao-Feng, XU Jun-Jie
    2011, 40(07):  36-38. 
    Asbtract ( 1612 )  
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    Rongguan Iron-zinc Mine adopts the transition mining method from open pit to underground.Combining with its engineering geological situation，the paper studied the application of pillarless sublevel caving in this mine，and introduced its structural parameters of the two working benches.Then，some of parameters were optimized，such as lateral opening angle and bench height，by which the bulk rate and the ores loss and dilution rate were lowered，with a better economic benefit obtained.
    Structural Parameter Optimization of Ore Block by Backfill Mining Method
    LI Xin, LI Jun-Hua
    2011, 40(07):  39-42. 
    Asbtract ( 1869 )  
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    To control the surface movement caused by mining，the backfill mining method was adopted for underground mining in Sijiaying Changyu iron mine.On the basis of safety production，selecting appropriate parameters of ore block structure is particularly important for the design and construction of the mine.Through the application of FLAC3D to simulating different sizes of ore block structures，the block structure optimal parameters of filling mining method were obtained，which provided the basis to the design and development of mine.
    Industrial Test of High-efficient Submarine Exploitation in Sanshandao Gold Mine
    QIAO Wei-Guo, 吕Yan-Xin , WEI Lie-Chang, WANG Ping
    2011, 40(07):  43-46. 
    Asbtract ( 1977 )  
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    Submarine mining exploitation is rare at domestic and overseas.Xinli mining area of Sanshandao Gold Mine，is the first metal mine carrying out submarine mining exploitation in our country.It is necessary to make a full investigation on submarine safety of metal mining.According to production practice and relevant experience at home and abroad，the perturbation layered back-filling method of low room pillar settlement in quasi strata outside vein is proposed and reasonable mining quasi scheme and recovery sequence are determined.Industrial test results show that the perturbation layered back-filling method of low room pillar settlement in quasi strata outside vein has significant advantages of more working faces，higher mining intensity per unit area，higher mining efficiency and so on.It is of great significance for submarine exploitation and owns remarkable economic and social benefit.
    Discussion on the Treatment Scheme of Mined-out Area of No.2 Ore Body of a Multi-metal Mine in Inner Mongolia
    ZHANG Fei, TIAN Rui, JIAN Yu-Rong, WANG Jian-Jun
    2011, 40(07):  47-50+73. 
    Asbtract ( 2667 )  
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    The exposed upper plate and roof area of the No.2 ore body mined-out area of a multi-metal mine in Inner Mongolia is about 0.1 million square meters，and the mined-out area is in irregular shape with wide distribution and staggered overlapping.According to the status of mined-out and the existing production facilities，the method of compulsory caving rock on the plate and inducing rock avalanche on the disk gradually filling mined-out area is recommended through comparative analysis，forming the buffer security cushion with a certain thickness above the operation area.Also，how to determine the safe thickness of the buffer cushion is researched，thus providing a reference for the similar large mined-out area.
     3D Reconstruction Algorithm on Irregular Cross Section Tunnel Based on Discrete Points
    GU Qing-Hua, GUO Jin-Ping, LU Cai-Wu
    2011, 40(07):  51-53+65. 
    Asbtract ( 1860 )  
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    In view of the request of 3D visualization on tunnel in underground，according to the topology structure of tunnels and the raw data of tunnels，a 3D reconstruction algorithm on irregular cross section tunnel based on discrete points was proposed.In this algorithm，a collaboration strategy of the shortest diagonal line and adjacent contour is adopted，which can effectively approach to the real tunnel entities.The simulation detection shows that this algorithm is stable in performance，and can effectively realize the 3D fast reconstruction of irregular cross section of underground tunnel.
    The Methods for the Infiltration Upper-Edge-Line in Numerical Simulation  of the 3D Seepage Field in Tailings Reservoir
    ZHANG Li-Ting, QI Qing-Lan, LI Qiang
    2011, 40(07):  54-57+81. 
    Asbtract ( 1630 )  
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    Using the infiltration upper-edge-line by the existing methods in the numerical simulation of the 3-D seepage field，the larger errors of the numerical results would be caused compared by the testing results.According to this problems，a new indirect conversion method is presented to determine the more accurate location of the infiltration upper-edge-line.Based on the seepage theory and the finite element method，the numerical simulation is carried out to analyze the 3-D seepage field by selecting three different location of the infiltration upper-udge-lines.And the numerical results are compared with the testing results，which shows the validity of the method presented in the paper to accurately determine the infiltration upper-edge-line in the numerical simulation.
    Optimization Arrangement of Ground Pressure Monitoring Spots in Lingbao Iron Mine
    Ou Yang-Zhi-Hua , ZHANG Qing-Qing, CHEN Ping
    2011, 40(07):  58-60+65. 
    Asbtract ( 1570 )  
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    3D numerical analysis model of Lingbao Iron Mine was built by ANSYS software.And the stress concentration area in the level of 80 m was found through calculating the stress distribution of rocks.Combining with the investigation results at the middle section of mined-out area，four acoustic emission monitor spots are optimally arranged，thus providing a base for strengthening the mine rocks and monitoring acoustic emission of ground pressure activities to ensure the safe recovery of mine.
    Application Test of Remote Sensing Rock Mechanics in Mine
    LIU Shan-Jun, XU Zhong-Yin, WU Li-Xin, MA Bao-Dong, LIU Xin
    2011, 40(07):  61-65. 
    Asbtract ( 2028 )  
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    The experimental research of remote sensing rock mechanics indicates that the infrared radiation of rock varied characteristically in the process of rock loading and catastrophe happening，and the infrared technology can detect the stress and catastrophe of rock.In this paper the infrared detection tests were carried out in Yu'ernie gold mine of Hebei province and Qidashan iron mine of Liaoning province on the basis of past experimental research to the issue of mine safety related to rock fracture and destabilization.The result showed that thermal imager could detect effectively the high-stress area of tunnel，roof caving，water seeping，fault and landslip of opencast mine.The thermal images in these area were different form that of normal rock around.If the detection is carried out dynamically for a long time，the thermal imaging technology can predict the happening of mine disaster.The test results provide a new method to detect and predict the disasters happening of mine.
    Analysis of Mining Investment Timing based on the Real Option
    CHEN Hai-Yan, XIE Zhi-Qin, CAI Si-Jing
    2011, 40(07):  66-68+117. 
    Asbtract ( 1518 )  
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    The mining investment that can be delayed is equal to a real option.Based on the improved decision-making model of best mining investment timing，the critical price and value of zinc mine investment at abroad were analyzed.The results showed that the critical price of the zinc mining investment P* is $2 069.69 and the critical value V(P*) is $348.60.It is feasible to invest the zinc mining project in 2010.The critical price of the zinc mining is most sensitive to production cost C.If the production cost C decreases by 1%，the critical price will be reduced by 0.772 1%.The critical value is most sensitive to convenience yield δ.If the convenience yield decreases by 1%，the critical value will be increased by 1.329 7%.
    Analysis on Motion Law of Mineral Particles during the Flash-wind Magnetizing Roasting Process
    QI Chao-Ying, YU Yong-Fu
    2011, 40(07):  69-73. 
    Asbtract ( 1913 )  
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    Based on the introduction to the basic theory of flash-wind magnetizing roaster，the influences of mineral particles' initial velocity，and gas flow velocity，particles' diameters and other factors on the motion law were investigated from the angle of the sport dynamics，where the single mineral particle in the vertical pipe of furnace was considered as the research target.Then，the movement law of mineral particle groups was derived，and the basic principles of the determination of terminal velocity of particle settling，the wind-cone design and the air flow control were proposed during the design process of the flash-wind roaster.
    Reseach of Technological Mineralogy on the First-stage Opencast of Sijiaying Iron Ores
    CHEN Yue, CHU Hai-Xia, CHEN Yan-Ting, LIU Xiao-Min
    2011, 40(07):  74-77. 
    Asbtract ( 2032 )  
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    Systematically studied the chemical composition，mineral composition，main mineral dissemination characteristics and dissemination size of ores from Sijiaying Iron Ore Mine first-stage opencast.Based on the analysis of techno-mineralogical properties and washability，the ores in opencast are divided into three types：easy to disintegrate and easy to select，easy to disintegrate and hard to beneficiate，hard to disintegrate and hard to beneficiate.And analyze the mining selectivity of the three types，identify their distribution as well.These investigation results provide ways for optimizing the mineral processing technology，and can be a useful reference for developing this type of iron ores.
    Separation Tests of a Mixed Copper-lead Concentrate in Xinjiang
    HE Ting-Shu, WEI Zhuan-Hua, WANG Sen
    2011, 40(07):  78-81. 
    Asbtract ( 1590 )  
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    According to the properties of copper-lead mixed rough concentrate of a large-scale mines in Xinjiang，a reasonable test process is proposed to carry out the tests on the consumption of active carbon for reagent removal and combined inhibitors for lead suppression in Cu-Pb separation process，and the grinding fineness tests on the mixed rough concentrate to effectively make a separation of copper and lead.Through the optimal closed-circuit process，copper concentrate with Cu grade of 21.50%，lead content of 4.57%，and Cu recovery of 69.92% and lead concentrate with Pb grade of 46.89%，Cu content of 0.82% and Pb recovery of 55.39% were obtained from this mixed rough concentrate.
    Experimental Tests of Beneficiation of a Polymetallic Sulfide Ore
    LI Hong-Ling, LIANG You-Wei
    2011, 40(07):  82-85. 
    Asbtract ( 1691 )  
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    Based on the simple process mineralogical studies on a polymetallic sulfide ore with copper of 0.16%，lead of 0.86%，zinc of 2.92%，the technical conditions for recovering the valuable components are emphasized.The closed-circuit test process of copper-lead bulk flotation by one-roughing，three-cleaning and two scavenging，copper concentration by one-roughing，two-cleaning，and one-scavenging，lead concentration by one-roughing，two-cleaning，and one-scavenging，and zinc separation by one-roughing，four-cleaning and two scavenging is carried out.Finally，three concentrates of copper，lead and zinc with Cu grade of 22.17%，Pb grade of 52.19%，Zn grade of 39.15% at a recovery of 75.65%，84.25%，44.63% respectively are obtained.
    Research on the Leaching Effect of Extracellular Polymers of Acidithiobacillus Ferrooxidans
    WANG Li, WEN Jian-Kang
    2011, 40(07):  86-89+97. 
    Asbtract ( 1852 )  
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    The leaching solution of Zijinshan Copper Mine is adopted as the mother liquor to extract the Acidithiobacillus ferrooxidans to identify the purification and physiological features of bacterial strains.Then the nature of the extracted EPS and its fractions are analyzed and surveyed.Under 6 group combining conditions with addition of Fe3+ and the strain or not，deactivation of the strains or not，EPS separating from living cells or not，the law of potential variation of oxidization and reduction in leaching process of Zijinshan copper samples are investigated.Then the reasons for reforming this law are revealed one by one.The studies show that the leaching of EPS to the metallic sulfide ore can not do without its secreted living cells. 
    Vanadium Leaching Tests from Stone Coal with Hydrofluoric Acid
    HE Dong-Sheng, QU Yan-Hua, FENG Qi-Ming, ZHANG Guo-Fan
    2011, 40(07):  90-92. 
    Asbtract ( 2044 )  
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    Leaching vanadium from stone coal ore with HF as acid lixiviant were carried out，and the effects of fineness，HF acid concentration，leaching time，leaching temperature and liquid to solid ratio on vanadium leaching rate were investigated.The results indicated that the above factors have obvious effects on vanadium leaching rate，and the appropriate leaching condition is as -0.074 mm particles in the sample for 75%，HF acid concentration of 3.5 mol/L，leaching time for 8 h，leaching temperature at 60 ℃，liquid to solid ratio of 3∶1，and agitation speed of 600 r/min.And under these conditions，vanadium leaching rate can reach 97.91%.HF acid can effectively act with the vanadium-contained minerals and destroy its crystal structure，which is good for improving vanadium leaching rate.
    Research on the Separation Tests of a Low-grade Kyanite Mine from Jiangsu
    REN Zi-Jie, GAO Hui-Min, WANG Fang, HONG Li, GUAN Jun-Fang, ZHANG Ling-Yan
    2011, 40(07):  93-97. 
    Asbtract ( 1625 )  
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    The separation tests of desliming-magnetic separation-flotation with alkaline medium for a low-grade refractory kyanite ore of Jiangsu were adopted to explore the appropriate technical conditions for grinding，desliming，magnetic separation，and flotation.Based on this，the open-circuit process of grinding，desliming，high intensity magnetic separation and flotation with one-roughing and four-cleaning was made.Then，kyanite concentrate with Al2O3 grade of 55.13% were ultimately obtained.
    Superiority Research on Rare Earth and Aluminium Separation in Modified Naphthenic Acid Extraction System
    LI Jian-Hong, ZHANG Xing
    2011, 40(07):  98-100+109. 
    Asbtract ( 1603 )  
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    Distribution ratio and separation coefficient of aluminium，rare earth in naphthenic and chloronaphthenic acid systems with different extractant saponification value have been studied respectively in different acidity and aluminium concentration.The results show that optimized process parameters are all MAl=12.5 mmol/L，pH=0.10 and 0.35 extractant saponidication value in the two extractant systems.Moreover，separation coefficient of aluminium，rare earth in chloronaphthenic acid is about 4.5 times than naphthenic acid systems.Besides these，avoiding emulsion problem is also advantage of chloronaphthenic acid.So chloronaphthenic acid system has more superiorty.
    Influence of the Dispersants to the Flotation Properties of Lizardite in the System of Ethyl Xanthate
    ZHAO Li-Bing, YUAN Zhi-Tao, HAN Yue-Xin
    2011, 40(07):  101-105. 
    Asbtract ( 2080 )  
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    The influences of the different dosage and acidity of suldeg dispersants including sodium hexametaphosphate，sodium carbonate，CMC，DB-6024，DB-60，DB-504，DB-503 to the flotation recovery of lizardite are systematically studied in the butyl xanthate system.It is obtained that the activation of serpentine was decreased gradually by DB-504，DB-503，DB-60，sodium carbonate，DB-6024 in turn，while sodium hexametaphosphate had a weak inhibition effect and CMC had a strong inhibiting effect.Then，briefly introduced the action mechanism of butyl xanthate，sodium hexametaphosphate，CMC，DB-503 with lizardite.
    Floatation Study of Three Kinds of Collectors Towards Bastnaesite
    JIA Li-Pan, CHE Xiao-Kui, ZHENG Qi, ZHANG Lei
    2011, 40(07):  106-109. 
    Asbtract ( 1860 )  
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    Under different conditions，the floatation laws of sodium oleate，salicylhydroxami acid and Maoniuping rare earth collector（principal components are hydroxyl naphthalene-containing hydroximic acid) as collectors for bastnaesite are researched and the relative flotation mechanism are studied.Experimental results show：the dosage of collecting agent and sodium silicate has great influence towards bastnaesite floatation；the floatation effect of sodium oleate and Maoniuping rare earth collector is better than that of salicylhydroxami acid；round point of zero charge of bastnaesite where pH=8.5，the three kind of collecting agent have best floatation effect for bastnaesite；for collecting agents as hydroximic acid，complex reaction occers at bastnaesite surface，whereas sodium oleate may react in the manner of electrostatic adsorption and molecular adsorption；Competitive adsorption at mineral surface and formation of complex destroy association hydroxyl，salicylhydroxami acid and Maoniuping rare earth collector has new peak at 2 356 cm-1，and pentatonic chelate loop maybe formats.
    Metallogenic Significance of Eocene Granites from the East Sag-uplift of Nyainqenanglha Arc-back
    LEI Chuan-Yang, WANG Xiong-Wu, ZHANG Jun-Cheng, GOU Zheng-Bin, ZHU Si-Bao
    2011, 40(07):  110-113+138. 
    Asbtract ( 1775 )  
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    The petrological characteristics of Eocene Granites from the East Sag-uplift of Nyainqenanglha Arc-back study and the whole-rock geochemical analysis on Granitoid rocks showed that the REE patterns of granite presents right decline with Eu as a boundary of left-steep and right-slow style.Granitoid was formed in late stage of collision under tectonic environment of short stress relaxation and stretching.It is generated by the syntexis of the mantle and crustal material during subduction process，and the partial melting of the thickened crust salic.Besides，the deep-sea sediments in upper part of subducted slab also participated in the formation of the magma.Wall rocks consist of the acidic-intermediate volcanic rocks and silty slate stones，sandstone，and limestone.Its structure and growth are in favor of forming the epithermal deposit related porphyry deposit，porphyry-type deposits and skarn deposits.
    Method for Metal Mine Surveying Based on 3D Laser Scanning Technique
    YAO Ji-Li, LIU Ke-Li, ZHANG Lei, LIU Shou-Zhong
    2011, 40(07):  114-117. 
    Asbtract ( 1927 )  
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    There are many characteristics in 3D laser technology，such as rapid，non-contact，real-time，dynamic，initiative，high-density，high-precision，digital，automation，and so on，so it can be applied in the surface and underground surveying of open-pit.Based on the data of 3D laser scanner，a high accuracy 3D model is set up to provide the information for the mine design，mine production and dynamic data management.In addition，3D laser scan technology can be used to the underground tunnel survey with tunnel models created rapidly.Its spatial relations among tunnels are obtained through the model，providing the comprehensive and high-precision spatial data for digital mine.Lastly，the method for improving the accuracy and the principle of coordinate correction are presented.
    Application of TEM to the Mineral Exploration of Xiangshuihe Region
    WANG Guo-Fu, ZHANG Hai-Ru, ZHANG Fa-Quan, YE Jin-Cai
    2011, 40(07):  118-119+160. 
    Asbtract ( 1588 )  
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    Through the Transient Electromagnetic  Measurements（TEM) and the corresponding data processing，the corresponding relationship between the apparent resistivity of -350~-600 m and different lithologies are set up.According to the regional differences in apparent resistivity of lithology，it is divided into four fracture zones.Due to the apparent resistivity difference between rock and ore greater than two orders of magnitude，the spatial location of the ore is determined.With the actual verification of deep drilling，the rate of ore-finding reaches 75% with the efficiency of mining exploration greatly improved.
    Application of Geo-gas Survey in Prospecting for Deep Concealed Ore Deposits
    TANG Zhen, ZHOU Si-Chun, LIU Xiao-Hui, LIU Bin
    2011, 40(07):  120-122+142. 
    Asbtract ( 1515 )  
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    The paper introduced the theoretical basis，instrument and devices of geo-gas survey technology，and the geochemical graphic method of the rare earth，and made a discriminate analysis on the basic principle and method of these two nuclear processing data.The detection of the geo-gas of the concealed metallic ore and the geophysical anomaly in the HSP region confirmed that the analysis of the geo-gas survey data plays an important role in prospecting for the deep concealed metallic ore.
    Application Study on WIFI Wireless Location Technology in Open Pit
    WANG Bin, WANG Chun-Yi
    2011, 40(07):  123-126+134. 
    Asbtract ( 1984 )  
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    In view of the request of production management in open pit，the integration of digital surveillance dispatching platform is designed based on WIFI wireless communications technology.The system includes truck positioning，voice production scheduling and video monitoring in open pit.The system can not only conduct production scheduling in mining area，but also achieve mining equipment and personnel wireless location and wireless video monitoring.Thus，the mining enterprises reinforces safety management and improves the productivity efficiency by use of the system.At the same time，the spending of production is reduced.
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    Ou Yang-Zhen-Hua
    2011, 40(07):  127-130. 
    Asbtract ( 1637 )  
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    Tailing pond is an artificial debris flow hazard with high potential energy，so it is very important to monitor its stability to prevent the occurrence of dam breaking.Based on the GSM/GPRS communication network platform，the wireless remote transmission technology of monitoring data，which includes deep displacement and surface displacement of tailing dam，phreatic line，seepage pressure，water level of tailing pond，rainfall capacity，beach length and safety altitude difference，were researched with new-type monitoring technology and methods.Round-the-clock，automatic，remote monitoring of the stability of tailing dam was realized.High precision on-line monitoring system of tailings stability with the function of monitoring data timing acquisition and real-time transmission was constructed.This on-line monitoring system provided an effective technical mean to obtain the dynamic evolution information in the process of tailing pond operation.
    Analysis of Atomization Cooling Effect of Airflow in Partial Mining Face
    HENG Shuai, GAO Feng, LIU Guan-Nan
    2011, 40(07):  131-134. 
    Asbtract ( 1988 )  
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    In order to analyze the effect of atomization cooling in the partial high-temperature mining face，a describing technique of two-phase flow called Eulerian-Lagrangian method is adopted to simulate the effect of atomization cooling，and the coupling of droplet and wet air is taken into account in the process of calculation.The results of the numerical calculation show that the temperature of flow declines 4 ℃ rapidly after once atomization cooling，which satisfies the demand of cooling in mine.And the effective distance of every row of atomizers is 10 m in the direction of caving face.The temperature of flow goes up 1.5 ℃ after cooling.As a whole，the temperature of flow in caving face goes up statutorily.The cooling effect changes with flux of atomizer as a format of minus exponent.The effect of atomization cooling is obvious in the range of 70°~90° for the spraying angle，and a high pressure mist atomizer can improve the effect of atomization cooling distinctly.
    Cleaning Efficiency Test and Analysis of the Horizontal Pulse-jet Cartridge Filter
    YANG Long-Jun, YANG Jun-Rui
    2011, 40(07):  135-138. 
    Asbtract ( 1568 )  
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    Stability Analysis and Treatment of Mined-out Area in Qingshuichazuiyao Limestone Mine
    YANG Yue-Ping, REN Qing-Yun, YANG Shi-Jiao, TAO Gan-Qiang, WANG Zheng-Qing
    2011, 40(07):  139-142. 
    Asbtract ( 1598 )  
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    To research the stability of mined-out area in Qingshuichazuiyao limestone mine，and based on field investigation on the goaf and its mining environment，the field point load tests and the indoor uniaxial tensile and compressive strength tests were carried out to obtain the rock mechanics parameters.Three-dimensional finite element method was adopted to make the numerical simulation on this limestone mine.The simulation results indicated that Qingshuichazuiyao limestone mine was in low stability，and the concentrated tensile stress in the part roof of mined-out area maybe result in roof falling or wall caving with large ground subsidence.According to the analysis results and the on-site investigation，the corresponding countermeasures for mine safety was put forward，which provided a guide for mine safety production.
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    ZHOU Guo-Hua, ZHANG Chun-Yan, MEI Guang-Jun, LIU Hong
    2011, 40(07):  143-145+156. 
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    WO3 powder prepared under the optimal thermal decomposition conditions，was used as butyl xanthate to simulate the photocatalytic degradation of under visible light irradiation（λ≥420 nm）.The effect of various variables on the butyl xanthate degradation is investigated such as WO3 dose，initial butyl xanthate concentration，pH value and degradation time.Under conditions of the butyl xanthate concentration of 40 mg/L，1.0 g/L WO3 at pH=7 with the degradation time of 5 h，the degradation efficiency of xanthate reached 92%，and the removal efficiency of chemical oxygen demand(COD) was found to be 84%.Among these variables，the influence of solution pH on degradation butyl xanthate is most significant.The degradation of butyl xanthate is rapid at acidic solution media.The degradation rate reached 90% when pH=4 for 30 min.The kinetics studies showed that the butyl degradation of butyl xanthate followed the first class kinetic model at room temperature.The investigation of UV-Visible Absorption Spectrum on the degradation of butyl xanthate showed that only degradation product CS2 appeared in process of degradation butyl xanthate.
    Industrial Experiments for Treatment of Mine Wastewater from Dexing Copper Mine
    ZHANG Cheng, LIU Jian-She, PAN Bin, WANG Zhao-Hui, ZHAN You-Hong, ZHANG Wu-Gang
    2011, 40(07):  146-149. 
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    Taking the mine wastewater from the industrial waste-water treatment station of Dexing Copper Mine as research target， and the index of Chemical Oxygen Demand (COD)， heavy metals ion and SO2-4 and suspended solid(SS) as water  quality monitoring index， the feasibility of applying the integrated Fenton oxidation- neutralization-PAM flocculation techniques to attain standard discharge is studied. The industrial experiments for 48 h indicated that with the rational addition of H2O2， calcium carbide and PAM， a high removal rate of COD，SO2-4， the heavy metal ion and SS was realized. Then each index of the treated water can meet I-class criteria specified in Integrated Wastewater Discharge Standard(GB 8978-1996) in China.
    Research on Collecting Iron Mineral Technology for No.1 Ore Dressing Workshop Tailings of Gongchangling Concentration
    WANG Ze-Hong, YUAN Zhi-Tao, YU Fu-Jia, HAN Yue-Xin, WANG Yang
    2011, 40(07):  150-152. 
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    The properties of primary concentrate from the recovery machine in No.1 Ore Dressing Workshop of Gongchangling Concentration was studied systematically in this paper.The effects of grinding size and low magnetic field intensity as well as pulsating current and rising water flow rate of electromagnetic sorting machine on the separation index were also investigated.Using the flowsheet including one-stage low magnetic pre-concentration，one-stage grinding，two-stage low magnetic separation，one-stage electromagnetic sorting，tailings of which was returned to grinding to treat the primary concentrate，the high quality concentrate product with grade＞67% and recovery 72% was obtained.This study provided a technical solution for No.1 Ore Dressing Workshop Tailings in Gongchangling Concentration to recovery the strongly magnetic mineral more effectively and more steadily.
    Study on the Comprehensive Recovery Process of Tailings from a Certain Iron Mine
    ZHANG Ya-Hui, SHI Wei, ZHOU Chao, LI Yan, JI Ting-Ting
    2011, 40(07):  153-156. 
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    The chemical composition of tailings sands with Fe 21.77%，Cu 0.20%，S 1.03% and the phase of main mineral were analyzed，and then a process of low intensity magnetic separation-high intensity magnetic separation-reduction roasting-low intensity magnetic separation-bulk flotation of copper and sulfur-separation of copper and sulfur is made to get Fe，Cu and S.Under the optimal technical conditions obtained from tests，iron concentrate with a yield of 20.39%，Fe grade of 61.62%，Fe recovery of 57.71%，copper concentrate with Cu grade of 14.57%，Cu recovery of 3.21%，and Sulfur concentrate with S grade of 38.21% and S recovery of 10.95% are achieved.The conclusion is that the recovery of iron minerals reaches remarkable economic benefits，but the recovery of copper and sulfide minerals are not ideal.
    Preparation of Poly Aluminum Ferric Sulfate with Washed Tailings of Bauxite Ore
    DENG Hai-Bo, WU Cheng-Gui, YANG Wen, LIN Kai-Ping, ZHU Hai-Ling, HE Xiao-Min
    2011, 40(07):  157-160. 
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    Taking Guangxi karst accumulative bauxite tailings as raw materials，a systematic study on the technical conditions for the preparation of poly aluminum ferric sulfate（PAFS） by rational acid leaching of aluminum and iron is carried out.Through the turbidity and COD removal tests，the flocculation performance of self-made PAFS and polymer aluminum sulfate（PAS) at market is compared.The results show that the PAFS has a better performance in turbidity and COD removals than PAS.Therefore，the widespread application of this technique can not only make full use of resources and promote resources recovery，but also systematically find a way to deal with the tailings.
    Influence of the Fineness of Silica Materials to the Properties of Aerated Concrete with Low-silicon Copper Tailings
    QIAN Jia-Wei, NI Wen, LI De-Zhong, HUANG Xiao-Yan
    2011, 40(07):  161-164. 
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    The influences of the Shouwang Fen low-silicon copper tailings and the fineness of high-silicon silica sand to the properties of the mobility，stability，bone-dry strength and bone-dry ratio strength of the aerated concrete slurry are tested in the experiments.It is obtained that the optimum grading fineness of the aerated concrete with the low silicon copper mine tailings and silica sand as silicon materials are copper tailings grinding for 20 min（+0.074 mm 1.1%)，silica sand grinding for 30 min（+0.074 mm 5.2%).
    Research on Cementing Property of Cement with Tailings Powder of Desulphurization and Slag Skimming
    LIU Xiao, HAN Yue-Xin, LI Li-Xia, SONG Ning-Bo
    2011, 40(07):  165-167. 
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    The composition of the desulphurized and skimmed slag tailing from Ansteel is similar to the silicate cement， and the water requirement of normal consistency， soundness， setting time and strength of slag tailings-blended cement were researched respectively by adopting the tailings slag powder stead of silicate cement.The comprehensive analysis indicated that the tailings powder of desuphurization and slag skimming can replace some of the cement.But it has a negative effect on the compressive strength and rupture strength of cement mortar at different days.Therefore， the maximum amount of tailings to be blended is recommended at less than 30%.