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Table of Content

    15 September 2012, Volume 41 Issue 09
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    Application of Natural Caving Method on the Thick and Broken Orebody
    YU Shao-Feng, WU Ai-Xiang, HAN Bin
    2012, 41(09):  1-4. 
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    The natural caving method is an underground mining method with the lowest cost in a Copper and Molybdenum mine.Two indexes-rock quality designation and gravity stress field of rock mass were used to research the cavability of the mine, and the natural caving method to exploit the mine were determined.Combine the yield way of shallow holes and medium-length holes to remove the ore, and employ the combination of spray support, setting spot holder, and optimizing pull bottom structure to control the ground pressure.Fabulous effects are achieved with the application of this method.This method improves ore rock stability, increases the allowed exposed area of the roof and hanging wall, improves ore drawing efficiency, enhances mining operations security, and enhances the management experience of the ground pressure controlling, construction and ore supplying.
    Numerical Analysis on Pillar Failure Process of Stope in Hongtoushan Copper Mine
    ZHAO Xing-Dong, LI Yuan-Hui, LIU Jian-Po
    2012, 41(09):  5-8+20. 
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    In this paper, the on-site investigation on the failure modes in the stope of Hongtoushan copper mine showed that there are mainly three failure modes under high stress, like spalling, splitting and shear failure.In order to study the failure modes of pillar, 3 kinds of combined model of ore-and-rock were set-up according to the on-the-spot investigation in Hongtoushan copper mine.Based on these, a numerical analysis based on the finite element method was applied to analyze the failure modes of 3 kinds of the combined model.The results indicated that, for Pillar I (copper ore), its failure is 'X shape' shear failure mode; for Pillar II (upper of pillar is rock and its bottom is ore), the initial failure occurs in the upper rock of pillar and only some cracks appear in the bottom of pillar; for Pillar III (upper and bottom of pillar is rock and its central part is ore), the initial creak occurs in the upper and bottom of pillar, then the creak propagates toward the central ore until the crack coalescence.This numerical result provided some basis knowledge for the pillar design of other similar mines
    Support Parameter Optimization of Extremely Large-section Open-off Cut in Secondary Tunneling
    ZHU Jian-Ming, YANG Chong
    2012, 41(09):  9-12+145. 
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    As more and more 5~7 m coal seam adopting gradually coal mining with all height at one time, the technology of large-section open-off cut is gradually adopted.So the study of large-section open-off cut supporting and driving technology is the key of the implementation of this technology.According to the specific geological characteristics of large-section open-off cut on the working face of Luan group coal mine, a support scheme using the bolt-steel mesh-anchor combined support was proposed.With the three-dimensional numerical calculation method, the rational supporting parameters are determined.In order to verify the rationality of supporting scheme, the actual monitoring was conducted.The results show that the supporting scheme is reasonable and reliable.It can fully meet the need of safe production, and it also provides reference for the similar conditions
    Field Test Experimental of Tunnel Surrounding Rock Loosing Circle of Deep Well and Supporting Scheme Improvement
    JIANG Bang-You, GU Shi-Tan, LI Nan-Nan, WANG Chun-Qiu
    2012, 41(09):  13-15+56. 
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    Coal and rock of tunnel periphery deformation and failure occurs, surrounding rock will be broken and cracked, and then loose circle formed after excavation of tunnel surrounding rock stress distribution again, when stress is more than the limit of coal and rock stress.Loose circle will be influenced by strength of surrounding rock, original rock stress size, tunnel section, excavation and supporting of tunnel.Based on the electromagnetic wave propagation in GPR loose circle detection mechanism analysis rock loose circle was detected in different position of track tunnel, surrounding rock loose circle is in the range of 1.1 m to 1.6 m.According to the test results, the supporting scheme of pillar improves.
    Study of Production Capacity Constraint Index in  Coal Mine From Flat Seam to Inclined Seam
    ZHAO Hong-Ze, ZHANG Rui-Xin, ZHEN Xuan, XUE Wan-Hai, YAN Ning
    2012, 41(09):  16-20. 
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    The coal seam of Antaibao open-pit mine in china change from flat seam to inclined seam during the mining area of Luzigou anticline.The main restricted factors of production capacity of inclined seam was analyzes，and the formula of level advanced speed, vertical advanced speed and digging trench speed were summarizes.Furthermore, a case study and sensitivity analysis of the impact factor were conducted.The results show that the maximum level advanced speed is 520 m，and the maximum vertical advanced speed is 40 m.In the existing equipment capacity for Antaibao open-pit coal mine，which can be improved by increasing the working slope angle.The theoretical formula verified by compared with actual data.It provides a basis for confirming production capacity in surface mine.
    Pipe-Conveying Parameter Calculation and Simulation Validation of Deep Mining Filling System of Hongshaping Mine
    TAO Ping-Kai
    2012, 41(09):  21-23. 
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    Through the research filling pipes two phase flow of the basic theory, the filling pipe filling in the settlement of rules and forms of exercise was analyses, huangshaping ore critical flow velocity and two phase flow hydraulic gradients was calculated.Filling flow patterns and rheological properties in the pipe of filling body was analysis.Reynolds number as a numerical calculation pastes the theoretical basis of the flow pattern was choose.ANSYS finite element software Flotran fluid mechanics module was used in the numerical calculation.it provides theory support for huangshaping ore deep filling pipes.
    The Optimum Selection of Mining Method and Rock Mechanics Analysis of a Gold Mine
    LIU Guo-Xi, DONG Shan
    2012, 41(09):  24-28+36. 
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    The Mining engineering in this deposit belongs to deep mining.Selection of mining methods plays an important role in ground pressure control.Based on geological analysis in this area, combining with the actual production in Sanshandao Gold Mine, Jiaojia Gold Mine and other similar mines, the upward drift stoping with backfill is adopted, according to the relevant provisions of the local safety supervision departments.Through the mechanical analysis and the numerical simulation method, the influential factors on the drift stoping are analyzed from the mining structure parameters, filling materials and filling operation, then some suggestions are put forward.
    Application of Three-dimensional Structure in the Hydrodynamic Affect the Tunnel
    TANG Bai-Xiao
    2012, 41(09):  29-31+36. 
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    The dynamic pressure heading damage mechanism and supporting principle was analysis, and through the Ⅳ 3 Huaibei by dynamic pressure influence wheel-driven, the characteristics of the steel grids tunnel 3D bolt-shotcrete support new structure was research and design.This supporting structure has greatly improved spray layer, and the bending capacity overall has certain shrink retractable, thus the supporting structure can bear larger deformation pressure and dynamic pressure load.It effectively controls the dynamic pressure of tunnel instability problems, and a repair tunnel success is realized.
    Risk Assessment Model of the Strategic Area Selection for Overseas Iron Ore Resource Exploitation
    ZHENG Ming-Gui
    2012, 41(09):  32-36. 
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     “Going out” for overseas mineral resource exploitation is an arduous and complex task, many difficulties may be faced, and doing a good job in the strategic area selection is the first and foremost task.Based on the principle of the strategic area selection for foreign iron ore resource exploitation, firstly, the expert investigation method was used to identify the main risk factors, and then a risk assessment index system including 15 second-level indexes was established, the weight of which was determined by the Delphi method; secondly, the 15 second-level indexes were classified, and a risk assessment model was established; thirdly, 8 countries whose iron ore resource is rich are assessed.The research results show that:the risk assessment model can be used for the strategic area selection overseas iron ore resource exploitation, which can provide corresponding decision supports for the mining enterprises and government to carry out overseas iron ore resources exploitation.
    Numerical Simulation of Overburden Rock Strata Fracture Dynamic Progressive Process Induced by Caving
    LI Wen-Zeng, LI Qi, MA Qun
    2012, 41(09):  37-39+42. 
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    Dynamic progressive process of overburden rock strata fracture induced by caving is simulated by rock Rock Fracture Process Analysis system（RFPA2D）code.Moreover，it is simulated by the same code that controlling mining pressure and falling of rock layer above the ore bed by the reserved coal pillars.The simulated results reveal that RFPA2D can realistically simulate deformation，vertical discontinuous displacement，fracture and surface subsidence law of overburden rock strata from geometrical characteristic，rock mechanical property，deformation，fracture mechanism and support characteristic.Therefore，it can conclude that RFPA2D is a new approach to research overburden rock strata fracture.
    Blasting Effect Comparison of Different Spatial Position Relationship between Rock Strata Dip and Bench Slop
    DING Yi-Ming, CHI 恩An, ZHANG Xiu-Yu, PAN Yu-Zhong
    2012, 41(09):  40-42. 
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    In the open pit soil-rock blasting process, the blasting effect will have a direct impact on the project construction period, economic benefit and other processes.And various factors such as the structural surface of rock, bedding-joint, air face, hole nets parameters restrict the blasting effect.Effect comparison and blasting experiment on different relationship of spatial position between rock strata dip and bench slop obtain the best position relationship between rock strata dip and bench slop, the hole parameter designs at each position, and the construction working points.
    The Influence of Foam on Strength and Rheological Characteristics of Filling Cementing Materials
    LI Mao-Hui, GAO Qian, 南Shi-Qing
    2012, 41(09):  43-47. 
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    The composite filling cementing material with slag is a new kind of cementing material.Compared with cement, this filling material is much better with feature of higher strength, no pollution and lower cost.The analysis on the new tailings foam filling cementing material mortar by strength comparison and rheological experiments indicated that:with appropriate foam agent added, the strength of the cementing material is not reduced, but the uniformity of the slurry is increased.Under the same conditions, the consumption of cementing material can be reduced and its rheological properties increased.
    Mineral Processing Experiments on a Ilmenite Ore from Shanxi
    HUANG Si-Jie, YE Zhi-Yong, YOU Man-Li
    2012, 41(09):  48-51. 
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    Aiming at the characteristics of a low grade primary ilmenite ore from Shanxi, a series of experiment, including low intensity magnetic separation for priority selection of titanomagnetite, high gradient magnetic preconcentration of low intensity magnetic separation tailings, flotation desulfurization of the rough ores from preconcentration, flotation separation of ilimentite were carried out to evaluate a beneficiation scheme.The results showed that a Panxi titanomagnetite concentrate with TFe grade of 52.46% and TiO2 grade of 11.35% was obtained while the recovery rate of TFe and TiO2 were 27.63% and 16.41%.A titaniferous iron concentrate with TiO2 grade of 46.28%, recovery rate of the TiO2 45.30% were also obtained.
    Experiment on Mineral Processing  of High-Sulfur Copper Zinc Ore from Xinjiang
    YU Jiang-Hong, HUANG Jian-Fen
    2012, 41(09):  51-56. 
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    According to the characteristics of a high-sulfur copper zinc ore from Xinjiang, the ore was studied by the principle flowsheet of copper-zinc bulk floatation-regrinding of the rough copper-zinc concentrate-copper-zinc separation-extracting sulfur from copper-zinc bulk floatation tailings.Studies show that, the appropriate grinding fineness of copper-zinc bulk floatation and regrinding of the rough copper-zinc concentrate are-0.074 mm90% and -0.043 mm95%;J102 and butyl xanthate are copper-zinc mixed flotation effective collectors;T-21 and zinc sulfate combination has strong inhibition on sphalerite;J102 on copper mineral selective collector can better achieve the separation of copper and zinc.Using the closed-circuit flowsheet that determined by the tests treating the ore, it can obtain the copper concentrate with copper 20.09% and recovery 86.46%,  the  zinc concentrate with zinc 20.09% and recovery 86.46%, the sulfur concentrate with sulfur 45.95% and recovery 74.09%.
    Experimental Study on Complex Copper-zinc Sulfide Ore from Tibet
    LI Fu-Lan, HU Bao-Shuan, LI Guo-Dong, LU Pei-Pei
    2012, 41(09):  57-60+79. 
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    Based on the study of the property of a complex copper-zinc sulfide ore from tibet, the process flowsheet of preferential flotation Cu and the tailings of flotation Cu treated by flotation Zn was adopted and the technical conditions of Cu-Zn mineral roughing and cleaning were researched.A copper concentrate contenting copper 20.10%with recovery 70.26% and contenting silver 90.20 g/t,  a zinc concentrate contenting zinc 42.33% with  recovery 75.35% and contenting silver 14.80 g/t can be obtained by the finally definitive closed circuit test.Although the copper-zinc separation was successful realized, the recovery of silver in copper,zinc concentrate needs to be further improved.
    Test on a Low Grade Refractory Copper-sulfur Ore from Gansu
    YUAN Yan, LI Guo-Dong, GUO Hai-Ning
    2012, 41(09):  61-64. 
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    In view of a low grade refractory Cu-S ore characteristics, the separation conditions of Cu-S bulk flotation and separation flotation of Cu-S were studied,the technological conditions which was determined can solve effectively the problem that the difficulty of Cu-S separation due to high content secondary copper sulphide.In the condition of the grinding fineness of Cu-S bulk flotation was 70%-0.074 mm and the regrinding fineness of Cu-S concentrate was 90%-0.043 mm,the process flowsheet with once roughing, twice cleaning and once scavenging of Cu-S bulk flotation, the Cu-S concentrate after reginding with once roughing, twice cleaning and once scavenging of Cu-S separation ,middlings return in order was adopted, the test result can be obtained:Cu concentrate with copper grade 16.25% and recovery 63.07%,S concentrate with sulfur grade 37.45% and recovery 80.03%．
    Experimental Study on a Refractory Rich Silver-bearing Lead-Zinc Ore of Gansu
    SUN Yun-Li, LI Guo-Dong
    2012, 41(09):  65-68. 
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    According to mineral characteristics of low grade,high oxidation rate and close intergrowth of a refractory lead-zinc ore.The process flowsheet of part lead selective flotation and lead-zinc bluk flotation was adopted.Test results indicate that under the conditions of appropriate grinding and reagent system, a lead concentrate contenting Pb 58.71%with recovery 21.81%and contenting silver 7 476.81 g/t with recovery 14.39%，and a lead zinc mixed concentrate contenting Pb 25.61%，Zn 23.64%，Ag 5 593.42 g/t with the corresponding recovery 54.39%,65.67%,59.49% can be obtained.The total recovery of lead is 76.20%, the total recovery of zinc is 67.24% and the total recovery of associate silver is 73.88%.
    Beneficiation Test of a Skarn Type Scheelite from Henan
    ZHOU Xin-Min, SONG Xiang-Yu, LI Cui-Fen
    2012, 41(09):  69-71. 
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    According to the ore properties of a skarn scheelite from henan, studied the suitable gringding fineness, roughing test conditons of scheelite after flotation desulfurization and cleaning test conditons of crude scheelite concentrate. Based on those conditions, carried out the flowsheet of one stage grinding, once roughing once cleaning pre-desulfurization, three times roughing of scheelite,  thickening-desliming of scheelite rough concentrate, twice cleaning once scavenging, and get the scheelite concentrate with WO3 grade 52.15%, recovery 70.53%.
    Research on Beneficiation-Metallurgy Technology for Low-Grade Oxidized Wulfenite in Xiaoqinling Area
    CAO Yao-Hua, 吕Liang , LIU Hong-Zhao, YUE Tie-Bing
    2012, 41(09):  72-75. 
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    The low-grade oxidized wulfenite in Xiaoqinling area contains Mo 0.078% and Pb 0.34%, the rate of Mo and lead oxide are 64.02% and 58.06% respectively, and the useful mineral is fine-grained and disseminated closely.This ore is studied by the beneficiation-metallurgy combination process:molybdenum lead bulk flotation- leaching molybdenum oxide by sodium sulfide method-recovery of molybdenum sulfide and lead sulfide by flotation from the leaching residue.As the results showed, the molybdenum oxide with the grade of Mo 64.03%, the molybdenum sulfide with the grade of Mo 12.56% and the lead concentration with the grade of lead 43.07% were obtained under the conditions determined by experiments, and the total recovery rate of Mo and lead were 75.06% and 66.17% respectively.
    Removing Impurity Ions From the Constant-pressured Acid Leaching Lixivium of a Laterite Nickel Ore in South of Ganzhou
    ZHOU Xiao-Wen, LIU Zhi-Lin
    2012, 41(09):  76-79. 
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    The constant-pressured acid leaching lixivium of a laterite nickel in south of Ganzhou contains impurities Fe,Mg,Cu,Pb,Zn ions which are separated with the nickel ions difficulty.Used the amarillite craft to wipe off the ferric ions, the removal rate of ferric ions could reach 99 %,used sodium fluoride craft to wipe off heavy metal ions, the removal rate of cupper ion, lead ion and zinc ion all could reach 90%,used sodium fluoride craft to wipe off the magnesium ions, the removal rate of magnesium ions could reach 90%, the loss rate of nickel ions in every craft was about 15%,12%and 5%.
    Desilication Research by Reverse Flotation on Bauxite from Yunnan
    ZHU Peng-Cheng, GE Ying-Yong, LUO Ming-Kun
    2012, 41(09):  80-82+86. 
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    Diaspore from Yunnan is one kind of high silicon and aluminium while low w (Al2O3)/ w (SiO2) bauxite.Studied the technological conditions on the reverse flotation process in increasing aluminium grade and decreasing silicon content in bauxite.The results demonstrate that at these optimal conditions of 85% -0.074 mm grinding size, pH=5.5, 150 g/t of combination collector GE-601 and E3 with a mass ration of 2∶1, 600 g/t of OP as depressor, after once roughing, once cleaning and three times scavengings, middlings order to return could get the Al2O3 grade of 67.65% and 67.52%, and recovery of 82.04% and 81.77% with a w (Al2O3)/w (SiO2) of 10.72 and 10.58 when reaction at room temperature and 8 ℃, separately.These results indicate that our combination collector works better in low temperature.
    Sodium Roast and Extraction of Vanadium from Low Grade Stone Coal with High Calcium from Hubei
    HAN Shi-Hua, ZHANG Yi-Min, BAO Shen-Xu, HU Yang-Jia
    2012, 41(09):  83-86. 
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    Sodium roast using NaCl, Na2SO4 and compound of both as roasting additives was studied in vanadium extraction from low grade stone coal with high calcium from Hubei Province.On the condition of roasting with sodium chloride, the water leaching rate of vanadium was affected because of too much free calcium oxide in the raw ore, which inclines to combine with vanadium, producing water-insoluble calcium vanadate.On the condition of roasting with sodium sulfate, even though it can fix calcium, the dosage of sodium sulfate was too large, and economic costs and environmental costs were very high.When roasting with the mixture of 7% NaCl and 16% Na2SO4 at the conditions of roasting temperature of 850 ℃ and roasting time of 3 h, the water leaching rate increased to 51.47%, and the total leaching rate of vanadium could reach 79.81%.The leaching results were good at small dosage of roasting compound additives.On one hand, roasting with Na2SO4 can fix calcium, so as to inhibit the formation of water-insoluble calcium vanadate.On the other hand, the strong oxidizing atmosphere of HCl and Cl2 produced by adding NaCl can strengthen the destruction of the crystal structure of mica and promote the oxidation of vanadium.
    Test on Hydrometallurgical Leaching of Vanadium from a Stone Coal in HuBei
    WEI Qing, DAI Zi-Lin, LI Gui-Ying, WU Hai-Ying
    2012, 41(09):  87-89+102. 
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    The vanadium stone-coal in Hubei mainly occurs in the aluminum silicate minerals.The vanadium leaching rate of sulfuric acid leaching is only about 30%.The study investigated the effect of aid-leaching reagent A, B or mixture of A and B on vanadium leaching rate, separately.The results showed that both aid-leaching reagent A or B enhanced the leaching rate of vanadium.The vanadium leaching rate reached 88.5% in the experimental condition that sulfuric acid concentration was 30%, stone coal particle size 0.178 mm, temperature 90 ℃, time 8h, liquid-solid ratio 1∶1, while adding the aid-leaching reagent A 4% and B 2%.The study provided a guarantee for the realization of vanadium's extraction with a hydrometallurgical separation method.
    Characteristics of REE and Trace Elements in Southern Qiansunjia-Wasunjia Fracture
    WANG Zi-Guo, WANG Xiu-Juan, QIAN Jian-Ping
    2012, 41(09):  90-92. 
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    Based on the study about geochemical characteristics of REE and trace elements of Qiansunjia-Jinhuashan gold mining area, the article thinks that HREE closely related to mineralization in the two mining area, phyllic alteration is later than potassic alteration, sulphophile elements related Au elements are activate and brought during the alteration process, it has guiding significance for retrospectiving the source of ore and a further prospecting in this region.
    The Fluid Inclusion Physicochemical Characteristics of Dongzhongla Lead-Zinc Deposit
    HUO Yan, WEN Chun-Qi, CHEN Hong-De, FEI Guang-Chun
    2012, 41(09):  93-95+98. 
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    Through the study and the comparison about the fluid inclusion common characteristics, temperature, pressure, salinity, density, fugacity, pH, Eh, total sulfur and total carbon of pyrrhotite-chalcopyrite phase (I phase), sphalerite, galena-sphalerite stage (II stage)and calcite stage (Ⅲ stage)in Dongzhongla lead-Zinc deposit , we can draw a conclusion that Dongzhongla is a medium-low temperature epithermal deposit.
    Application of Underground Water Sounding Using Transient Electromagnetic Method in Desert Zone
    LIU Wen-Bo, LI Lei-Tao
    2012, 41(09):  96-98. 
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    Engineering geology and distribution of deep underground water in the Xilinhaote desert of Inner Mongolia is investigated and explored by transient electromagnetic method.Though disposing and inversing the data of sounding, the distribution of underground water will be learned，and the largest water inflow of average drilling depth is 300m by inverse calculation.Then the results of sounding provide an important introduction for choosing of borehole position.
    Research of Underground Personnel Positioning System based on the WiFi Technology
    ZHANG He-Dan, LU Cai-Wu
    2012, 41(09):  99-102. 
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    In order to optimize the underground mine management, enhance the security of underground work, and improve the personnel positioning accuracy, a underground personnel positioning system based on the WiFi technology with the fast transmission speed, long effective distance and high reliability is built after comparing with several kinds of major wireless location technology.The off-line training and on-line positioning was made with the algorithm for fingerprint recognition, and the position calculation was done with Euclidean distance formula.Experiments prove that this system is feasible and the positioning accuracy is improved effectively with positioning error less than 5 m.
    The Prediction and Visualization of Coal Mining Subsidence based on ArcGIS 
    SHI Xiu-Wei, LI Jing, ZHAO Huan-Xin, WANG Feng-Jiao, ZHANG Rui-Ya
    2012, 41(09):  103-106+166. 
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    The mining subsidence at first mining district of a coal mine at Shandong plain mining area was forecast by the Mining Subsidence Forecasting System software based on the probability integral method.The prediction results were analyzed by the 3D model of ArcGIS, which reflected the situation of mining subsidence in the form of Three-dimensional graphics.Compared with the actual situation, the accuracy of the forecast result is verified.It reduces the losses caused by mining subsidence and provides an intuitive and effective basis for controlling mining subsidence.
    Intelligent Tailings Pond Monitoring System Based on Agent
    ZHOU Yi-Peng, HU Juan
    2012, 41(09):  107-110+157. 
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    In view of the distributed management and decision-making requirements, as well as the rapid development of the monitoring technologies, a intelligent monitoring system based on Agent for tailings pond is proposed.The agents are used to describe different monitoring models, and monitoring tasks are completed through intelligent collaboration between the agents.In this way, adaptability and group decision-making ability of the system are enhanced.This system plays an important role for completely understanding the tailings pond' status and shares information among all of the departments.
    Application of Remote Sense and GIS to Site Selection of Large Scale Abandoned Dreg Field
    ZHANG Jia-Ming, REN Yong-Qiang, FU Ke-Jian, LIU Jiang
    2012, 41(09):  111-113+116. 
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    Site selection planning of abandoned dreg field during expressway construction concerns the economic benefits and the environment contamination et al..GIS has powerful space analysis function, such as space superposition and buffer analysis et al., which is helpful for site selection of abandoned dreg field.With Zhengjiaya tunnel abandoned dreg field of Yichang-Badong expressway as a case, remote sensing image processing and GIS were utilized to process relief map vectorially in site selection area to build Digital Elevation Model (DEM) of the selected area.Based on relative GIS spatial analysis including overlay analysis of remote sense image and DEM, and buffer analysis, the optimum site for site selection planning was selected, and the volume at the chosen site was calculated, which can hold the expected volume of abandoned dreg.This method with combination of remote sensing image processing and GIS provides new ways for site selection planning, and the research results have a practical value for improving the design and construction of expressway abandoned dreg field.
    Pressure Model of Correcting Block in Double Wall Drilling Tool
    MA Guang-Jun, REN Hong, WANG Jing-Yin, ZHU Li-Hong
    2012, 41(09):  114-116. 
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    Air drilling, as a member of under balance pressure drilling family, is different from conventional drilling methods.The drilling fluid along double wall drilling tool annular gap reach the hole bottom.There is a positioning device which is also called correcting block between the inner tube and the outer tube of the double wall, and because of the correcting block, the flow field is more complex.The pressure parameter of correcting block between the inner tube and the outer tube of the double wall is researched.Based on the fluid dynamics, pressure model is built through mathematical derivation.Combined with practical engineering examples, programming calculations, the model is solved.The total pressure loss value as a result of correcting blocks is obtained.It provides a strong basis to further explore the entire circulatory system pressure model.
    Mining Reclamation Auxiliary Information System Based on GIS
    XU Dong, WU Kan, YANG Yong-Jun
    2012, 41(09):  117-120. 
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    In order to meet the needs of mine land reclamation program development and improve the level of mine land reclamation information technology, this paper focuses on solving land damage prediction, land reclamation suitability assessment, engineering calculation, and land reclamation maps production.The geographic information system, remote sensing and 3D data visualization technology are applied to achieve mining reclamation auxiliary information system.With ArcGIS Engine, Visual Studio 2008, ENVI/IDL, we combined geographic information system, remote sensing and mathematical model with spatial database technology to build a set of land reclamation ancillary information system with strong scientific and versatility performance and functions of land damage prediction, land reclamation evaluation, planning, supervision and inspection.Through constructing a mining reclamation auxiliary information system, the planning efficiency and scientificity are improved, thus providing reference for information technology of mine land reclamation.
    Technology and Application of Multi-grades Dynamic State Magnetizing Roasting
    ZHANG Han-Quan
    2012, 41(09):  121-123+128. 
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    Multi-grades dynamic state magnetizing roasting is suitable for handling the powder low-grade oxidized ore.Refractory iron ore material about -3 mm diameter is declined by gravity through drying and dehydrating stage,preheating and roasting stage,cooling stage, traveled against to ascending high temperature wind current in furnace.Reactions of heat transfer and mass transfer are finished efficiently.The technology has properties such as high efficiency,low unit energy exhaustion,fast reaction,full magnetic reduction and can be used to deal with many kinds of oxidized iron.Designs of temperature and wind current matching are fulfilled in this system, balance and stabilization of temperature,pressure and reductive atmosphere are ensured in the processing.The roasted product can be separated by low intensity magnetic separator efficiently.Advantages such as high efficiency,low exhaustion and environmental protection are proved in research.Good separation indexes are also obtained in production.
    Study on 3D Geological Modeling for Mining Optimization of a Multilayer Complex Ore Deposit
    WU Jian-Fei, YE Yi-Cheng, WANG Qi-Hu, ZHANG Jie, LI Dan-Qing
    2012, 41(09):  124-128. 
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    Based on the 3DMine software platform and aimed at optimizing mining design and mining technology, a detailed geological database has been set up according to Shanghengshan multilayer complex ore deposit.The construction of geological solid model and block model of the mining area realized the 3D visualization under geological conditions at deposit.The V2O5 grade distribution in the mining area has been precisely evaluated by the distance power inverse ratio method, thus to make real-time dynamic assessment of the resource reserve.The established 3D geological model of mining area can be used as a foundation of mining optimization for its visualization and accuracy.
    Magnetic Matrices of High Gradient Magnetic Separator:Its Research Review and Developing Tendency
    LI Wen-Bo, HAN Yue-Xin, TANG Yu-He, YUAN Zhi-Tao, GAO Ying
    2012, 41(09):  129-133+153. 
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    The classification of magnetic matrices of high gradient magnetic separator is introduced.The research status of material，shape，magnetic field characteristic and capture mechanism is reviewed.The problems in the field of magnetic matrices of high gradient magnetic separation are discussed briefly.Its developing tendency is also discussed.
    Research and Development of the Typical Magnetic Separators at Home and Abroad
    HU Yong-Hui
    2012, 41(09):  134-138+153. 
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    Horizontal ring magnetic separator, vertical ring magnetic separator, roll type separator, column type and drum type separator are the five typical types of magnetic separation equipment widely used at home and abroad.The researches and applications of some key machine styles from several magnetic separation equipment manufacturers in different historical stage are focused.
    Production Environment Monitoring System of Underground Coal Mine Based on WiFi
    WANG Tao, LU Cai-Wu, FENG Zhi-Dong
    2012, 41(09):  139-142. 
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    In view of the problems and the insufficiency existed in present production environment monitoring systems of underground coal mine, according to company status and the actual demand, using C# language and the advantage of WiFi wireless communication technology and wireless sensor network, a production environment monitoring system is designed, which combines underground equipment orientation, production environment monitoring system with emergency rescuing.The system can not only meet the needs of efficient management in mine, and also realize the real-time display and early warning of every site environment parameter monitored underground coal mine and host computers.It provides strong safeguard for the security of equipment performance, personnel efficient work and life safety.Applications show that the system has stable performance, reliable technology and simple using method.And it can satisfy the practical needs of production monitoring in the current coal mine.
    Casing Pipe Plugging Method of Flood Discharging Tunnel in Tailing Dam
    LUO Dong-Lan, HU Hu
    2012, 41(09):  143-145. 
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    The plugging method of flood discharging tunnel commonly used in tailing dam at present requires personal coming into the flood discharging system to deal with.Hence, the plugging project needs to be finished at drying seasons.When an accident occurred or security risks existed in the drainage system, the plugging construction in the cave is largely limited in considerations of personal safety.In view of these shortcomings, the casing pipe plugging method with combination of temporary support by steel casing pipe and concrete sealing was proposed, which has been applied into the emergency rescue of tailings leakage in Yinshan Lead-zinc Mine.In this accident, the tailings leak risks are relieved rapidly and safely by adopting the casing pipe plugging, and the system works well till now.The plugging method provides a safe construction environment before personals come into the cave, and it is ideal for emergency rescue in the tailings leakage accident.Meanwhile, this method provides a fast, safe and effective sealing method and idea for dealing with the old security risks in flood discharging system of tailings dam.
    Landscape Terrain Restoration of Land Reclamation in Open-pit Mining
    WANG Yun-Feng, WEI Zhong-Yi
    2012, 41(09):  146-149. 
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    The concept of landscape terrain restoration in mine land reclamation was explained, its research progress at home and abroad was reviewed, and the goals, procedures, methods, measures and guarantee of landscape restoration in open-pit mining area were discussed.The landscape terrain and the hydrologic system restoration is the foundational goals for mine land reclamation, and the planning of landscape restoration combined with mining operations is the key step.
    Quick Diagnosis Technology of the High Density Resistivity Method for Tailing Reservoir Stability in the Earthquake-stricken Area
    WU Yu-Liang, DING Yuan-Wei
    2012, 41(09):  150-153. 
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    The tailing reservoir has been destroyed in different degrees due to 5.12 Wenchuan earthquake.The status quo of tailings dams, drainage systems and tailings reservoir safety management of Sichuan Hanyuan Jintai Mining Co., Ltd' tailing reservoir was inspected and evaluated, which can provide a basis to determine the security level of the tailing reservoir.Then the high density resistivity method was adopted to detect the structural safety of dam, and analyze the status of the security situation of the tailing reservoir in Jintai mining.Based on the risk assessment and the rapid diagnosis results by high-density resistivity method, the safety technical measures for tailings reservoir were given.
    Sliding Force Monitoring of Cut Tests on a Bedding Rock Slope
    FU Guo-Long, WANG Chang-Jun, TAO Zhi-Gang, XIE Xing, YAO Yuan
    2012, 41(09):  154-157. 
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    Two typical bedding rock slopes to take the excavation test also proceed in situ real-time monitoring by the remote monitoring and warning system of sliding force was choosed in Nanfen open pit iron mine in Liaoning province.The result shows that the bedding rock slopes usually occur local shallow pull-type damage under the influence of ground excavation disturbance, and sliding deformation through all the slope surface (vertical height about 12m).During the failure process with the emerging, expansion, breakthrough, instability of the cracks, the monitoring curve of sliding force issue the advance warning message completely.It can avoid serious security accident effectively which cause by landslide disaster.
    Arsenic Geochemical Behaviour and Prevention of Arsenic Pollution from Sulfide Tailings
    XU Pei-Bin, LEI Liang-Qi, MO Bin-Ji, LUO Yuan-Hong
    2012, 41(09):  158-161. 
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    Arsenic is carcinogenic and teratogenic and toxic elements and the arsenic pollution exists generally in the metal sulfide mining.When the physical-chemical environment being changed，the different morphology and valence state of arsenic also can be transformed,and it can gather in soil and water and lead to arsenic pollution .The common arsenide arsenopyrite can generate scorodite in the effect of oxygen and water.Under acidic conditions hydrolyze into arsenic acid, thus it can leaching and migration by wastewater.According to mechanism of arsenic contamination, demonstration that from mine tailings and source control and prevention of arsenic pollution and the importance of feasibility.In the arsenic pollution prevention and control, new mine tailings under water storage, acid neutralization and surface sealing technology, existing pollution tailings permeable reactive barrier technology and bioremediation technology, they are more mature, practical arsenic pollution control technology.
    One Rind of Steel Slag-kadin Badin Based Geopolymer Material
    HE Tian-Hui, HUANG Zi-Li, FENG Ding-Wu, LIU Yuan-Yuan, SUN Kai, WANG Xiao-Feng
    2012, 41(09):  162-166. 
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    Kaolin was thermally activated with the addition of sodium hydroxide through solid reactions, and geopolymeric materials were prepared with the thermal activation products and steel slags through mixing, hydration and pressure molding.The surface bonding, mineralogy, and microstructure and morphology of the raw material and synthesized geopolymers were fully characterized by using Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD) and Scanning Electron Microscope (SEM).The geopolymeric material with 5wt.% kaolin thermal activation products and 95wt.% steel slags presents the best compressive strength，and the 3 d,7 d and 28 d compressive strength is 20，30 and 28.9MPa, reached the nonbearing wall material level MU20, MU25 and MU30, respectively.The bonding information shows that three dimensional Si(Al)—O structures of geopolymer were generated during the hydration reaction; calcium silicate in the steel slag was activated by alkali to form C-S-H structures and the other substance as filling materials well increased the compressive strength.