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Table of Content

    16 October 2013, Volume 29 Issue 10
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    Analysis on the Current Situation of Tailing Reservoirs and Existing Problems in China
    HOU Xing-Yu
    2013, 29(10):  1-4. 
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    The tailing reservoir is one of the worst hazards influencing mine production and safety. According to the current situation of tailing reservoirs in China, the identification of risk factor, the division of tailing reservoirs in our country, stability analysis and development, utilization and reclamation of tailing ponds are summarized in detail. Ten, the major problems of tailing reservoirs which China is facing, such as design and safety assessment are analyzed in detail. Finally, some relative suggestions and consideration on improving tailings reservoirs' database, adopting the dry stockpiling are put forward.
    The Numerical Simulation Optimization Research on the Number of Rome and Pillar Method of the Stope Pillar
    HAO Shi-Bo
    2013, 29(10):  5-9. 
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    The dip angle of Liujia mining orebody of Shangdong province Xintal gold mining is 0°～22° and the average thickness is 4.17 meters.The liujia mining orebody is belongs to the Monzonitic granite type deposits, so, the room and pillar open stope filling later method is adopted by using the scraper. The stope area is 400 square meters an has 14 pillars. Due to number of the pillar is too much, so it makes the mine production more difficult. Through numerical simulation optimization, the number of pillar reduce to 4, the diameter of pillar increased to 5 meters. The research results indicated that, reducing the number of pillar is good for increasing the stope operation area,and good to the ore transportation in the stope.In addition, according to the experimental results, the round supporting mechanics is better than the square one, witch provide convenient conditions for forming the arch stope roof.
    Analysis on the Influence of Mining Height on the Movement Deformation of Overburden
    ZHANG De-Qing
    2013, 29(10):  10-13. 
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    The Flac3D of movement deformation of overburden rock is built, so as to do some relative research on the 31071 fully mechanized coal face of Henan Xindeng coal mine.The deformation and failure of the stress and displacement of strata under the condition of different mining height are studied in detail.The research findings show that, the overburden of caving zone,fracture zone increases accordingly,and the changes is obvious.At the same time,the distance of above the coal seam roof stress to redistribute also increased gradually with the increasing mining height.
    Research on the Supporting Technology and the Position Arrangement of the Layered Extraction Roadway
    LIU Wen-Long, DING Guo-Feng, ZHONG Yao-Hua
    2013, 29(10):  14-16+35. 
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    The deformation of the surrounding rock of the layered extraction roadway is severe, so it is so difficult to maintain the stability of roadway. The mechanical model of basic roof arc triangle block based on the analysis of the activity rules of the layered extraction roadway. The mechanical model is applied to do some research on the reasonable position arrangement of layered roadway along with the numerical simulation analysis. Take the supporting of Nan'aosi mine for instance, the high water quick-setting material is used to roof grouting so as to reinforce the broken zone. The hydraulic expansion bolt and rebar anchor are applied to the roof and the both sides respectively. The research results manifest that,the new technology in this paper can improve the integrity and the mechanical parameters of the broken surrounding rock. In addition, it is make the bearing capacity of surrounding rock strengthened and the deformation of surrounding rock controlled effectively, obtain the expected technical and economic effect.
    Experimental Study on the Adsorption of Pb2+ by Magnetic Chitosan Microspheres
    DENG Qin-Wen, WANG Jin-Song, XIONG Ya-Qin, 吕Jun-Wen , YANG Jin-Hui
    2013, 29(10):  17-20. 
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    The adsorption effects on the absorbent self-made absorb Pb2+ was researched by the absorb temperature, dosage, pH, reaction time, initial concentration. The results showed that the optimal adsorb condition is the initial pH of 5.0，the reaction time of 20 min, dosage of the absorbent is 0.900 g, initial concentration of Pb2+ is 50 mg/L. The adsorption isotherms of magnetic chitosan microsphere adsorb Pb2+ well fit Langmuir's, and Temin's models, belongs to pesuo-second-order reaction.
    Study on a New Method of Synthesis for Thiocarbamate Flotation Reagents
    ZHANG Xing-Rong, WEI Ming-An, ZHENG Gui-Bing, LIU Long-Li
    2013, 29(10):  21-23+55. 
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    Thiocarbamate flotation reagents were prepared by the reaction of xanthate and primary amine, or secondary amine, at 　　aminoethane, sodium xanthate, disulfur compound dosage of 1.1〖DK（〗∶〖DK）〗1.0〖DK（〗∶〖DK）〗1.0, in water at 30~35 ℃ for 1.5h with a self-prepared disulfur compound (ZS) as reaction accelerator. The synthetic rate is more than 93.0% and the purity is greater than 98.0%. The sythesis process was operation simplified, reaction mild, production quality stable, environmental friendly.
    Study on the Separation of Mixed Concentrate of Galena and Jamesonite
    CAO Yang, WANG Qing-Liang, TAO Hong-Biao, CAO Xue-Feng, HU E-Ming
    2013, 29(10):  24-26. 
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    The valuable element of a mixed concentrate, composition of galena and jamesonite, in Tibet was lead and antimony. After reagent removal by active carbon, galena concentrate with Pb grade of 72.09%, recovery of 50.96%, and jamesonite concentrate Sb grade of 10.89%, recovery of 76.67% was achieved by whole flotation process.
    The Application of 3DVent in the 3-dimensional Visualization of Mine Ventilation
    TAN Hai-Lin, HU Nai-Lian, WANG Xiao-Dong, LI Cheng-Long
    2013, 29(10):  27-29+39. 
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    The theory of Hardy-Cross of 3dVent 3D ventilation software is researched and the procedure of the breaking circle way is discussed in detail based on the analysis of the research status of 3D visualization. Take an actual mine ventilation system as an example, the 3-dimensional ventilation system model is built, so as to calculate the ventilation network and realize the 3-dimensional animation simulation of the calculation results.
    Research on Size Effect of Strength Test of Irregular Rock Point Load
    LUO Wen-Zhong
    2013, 29(10):  30-31+184. 
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    The point load strength test is implemented on the fresh rock picked up from the scene.The experimental results is analyzed detailedly based on the data of the size of the test block.The results of the research show that,The length of the rock is almost has no effect on the result of the research,so,the thickness and width are the main factors influencing the point load strength.To be specific,the best test results can be obtained under the conditions of the with in 50~100 milliammeter and the thickness in 30~50 milliammeter.Then,the strength of point load changes along with the changes of the size.On the whole,the research results in this paper can provide some refence for the further research in irregular rock point load strength.
    Local Expansion Stability Analysis on the High and Steep Open-pit Slope
    ZHANG Chun-Yue, SONG Wei-Dong, WU Shan
    2013, 29(10):  32-35. 
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    After the initial mining, Xiangbishan open-pit slope has formed a near 50°high and steep slope. If it continues to mining, it is necesary to calculate its stability so as to ensure the safety of production. According to the terrain and lithologic features, two typical geologic sections in the south side of Xiangbishan are selected, and the slope stability under different conditions is analyzed by using the Geo-slope software.The research results indicated that,the values of slope safety coefficient under different conditions were larger than the critical value 1.1, which means that the entire slope is stable after the expansion.
    Research on the Prevention of Rock burst at Caving Face Under the Legacy Pillar of Deep Mine
    ZHANG Yong-Cai, MA Zhuang, ZHANG Xiao-Lei, YU Yue-Feng
    2013, 29(10):  36-39. 
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    The pressure on a caving face under the legacy pillar of a deep mine is analyzed in detail. The high stress is explained by using the superposition of the static and dynamic loads theory. In order to deal with the high stress, the danger zone of below coal pillar mining working face is divided based on the vibration wave tomographic imaging technology. At the same time, a series of measures is taken to unload the stress. The effect of the measures is proved at basis of the analysis on the mine tremors and stress of caving face. Finally, the theory of dynamic prevention methods on high stress in deep mine is put forward.
    Numerical simulation analysis on Anchor Solid Buckling Mode of Layered roof in Coal Roadway
    ZHANG San-Yao
    2013, 29(10):  40-43+47. 
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    The anchor solid bucking mode of layered roof is researched systematically at the basis of theoretical analysis and numerical simulation experiment. To be specific, in the research process, the main influence factors of the buckling mode of layered roof are grouped, the characteristics of the stress and displacement is obtained based on the UDEC numerical simulation software.
    Numerical Simulation Research on Supporting effect of Row Spacing Between Short Anchor Cable of Whole Section
    ZHANG Dong-Liang
    2013, 29(10):  44-47. 
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    The deformation of the end of the drainage of Heibei Group six mine 2145 is obvious,and the deformation is becoming bigger and bigger. Therefore,to deal with this situation,some relative research work is conducted,that is the numerical simulation research on supporting effect of row spacing between short anchor cable of whole section based on FLAC3D software.Combining the numerical simulation results with the actual construction condition and economic benefit analysis, the row spacing of anchor cable is determined to be 1.4 meters so as to meet the production needs. The research results indicated that, the force of the anchor cable is stable,the deformation of surrounding rock is controlled effectively, at the same time the stability of the roadway is ensured.
    Research on the Safety Assessment Model of Gas Explosion Accident in Coal Mine
    WANG Wen-Cai, FENG Wei, LIU Wei, ZHENG Yan-Tao, ZHU Yu-Chen
    2013, 29(10):  48-53+61. 
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    The model is built through the improved analytic hierarchy process and comprehensive fuzzy evaluation based on three kinds of hazard theory of gas in coal mine so as to assessment the gas explosion accident in coal mine.In order to test the effect of the model,so the assessment is carried on for the five roadways of a coal mine in Shanxi. The experimental results indicated that the performance of the model is better than the tranditional ones and more similar to the real situations. According to the theoretical analysis and experimental results,the assessment model in this paper is capable to deal the actual situation.
    Rsearch on the Calculation Method of Tailings Deposited Beach Gradient
    JU Wei-Wei, XU Zhong-An, WANG Bo
    2013, 29(10):  54-55. 
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    The deposited beach gradient is the important parameter of tailings pond design and operation process.At present,there is no proper method to calculate the deposited beach gradient of new tailings pond. So,a new calculation method based on many factors is introduced so as to compute the deposited beach gradient in this paper. Some relative experimental results show that the performance of the method is good and the method is a reasonable and reliable thinking to deal with calculating the deposited beach gradient.