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Table of Content

    15 June 2014, Volume 30 Issue 06
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    Research on the Selection of Joint Protection Layers of Coal Seams Group under the Complicated Geological Conditions
    ZHAO Zhi-Fa
    2014, 30(06):  1-3. 
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    Combing the actual mining situations of coal seams group of the Yushe middle well of Gemudi mining area,the methods are discussed so as to eliminate the outburst dangers of coal seam from the perspective of the mining protection coal layers.The research results show that,the upper protection coal seams and lower protection coal seams are unable to relief the pressure of the central minable seams fully.The K9 and K40 coal seam are taken as the protection coal seams so as to conduct the double stack protection of the middle coal seams and eliminate the outburst coal seams dangers by mining at the same time.
    Simulation on Evolution Regularity of Mining-induced Fissure of Seam Floor
    LI Fei, ZHANG Jin-Ling, DUAN Li-Hong
    2014, 30(06):  4-6. 
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    The maximum damage depth and its evolution regularity of the rock mass of Longmeng coal mine seam floor are numerical simulated by RFPA2D and FLAC3D software. Besides that, the numerical simulation results are compared with the results of the experience formula of coal floor damage depth. The research results indicated that,the numerical simulation results are consistent with the results of experience formula.
    Research on the Connecting Technique of Increasing Production of Transition from Open-pit to Underground Mining
    LI Nan
    2014, 30(06):  7-9. 
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    It is difficult to realize increasing production of transition period from open-pit to underground mining by conventional method.So,taking Xiaowanggou iron mine as an example,a new method that forming overburden layers by induced caving is proposed so as to reduce mutual influence scope of open-pit and underground mining and extend the time of open-pit and underground mining.Through optimizing open-pit and underground mining technologies,the ultimate boundary is designed according to the principle of convenience for exploiting and benefit maximization.Besides that,some relative measures are taken to accelerate the underground mining process and realize the goal of transition period production of open-pit to underground mining is increased greatly year by year.
    Application of BK430 in Bauxite Reverse Flotation for Desilication
    LI Song-Qing, CHENG Xin-Chao
    2014, 30(06):  10-14. 
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    Flotation behavior of three typical bauxite resources in China was investigated using BK430 as collector. Monomineral experiment results showed that: BK430 have more intensively collecting ability for kaolinite and illite than diaspore with no depressor and weak acid conditions; the collecting ability was enlarged further when added with depressor DF for diaspore; artificial mixed minerals and monomineral test results fit well. Reverse flotation tests for desilication have been carried out on a bauxite, Henan, with alumina silica ratio of 4.43. After desliming—reverse flotation process, concentrate with Al2O3/SiO2 of 9.21, Al2O3 recovery of 62.49% was received. BK430 is expected to become a reverse flotation collector for desilication of bauxite under nearly neutral condition.
    Experiments of Recycling Tin from Tin Tailings
    ZHOU Xi-Lin
    2014, 30(06):  15-19. 
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    A tin ore of complex composition is from Yunnan province, with rich valuable metals, and valuable minerals mainly exists in form of skarn & skarn—sulphide ore type which are finely disseminated. Although after flotation—gravity concentration—flotation—magnetic separation treatment, there are also valuable minerals in the ore. Economic benefits was achieved through comprehensive recycling and utilization of the ore by gravity—magnetic combined separation process.
    Iron Recovery from a Tailing of Sulfuric Acid Slag for Iron Concentration
    ZHONG Su-Jiao, GAO Chun-Qing, WANG Hai-Liang, HOU Geng-He, SUN Bing-Quan
    2014, 30(06):  20-22+28. 
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    After spiral chute gravity concentration of a sulfuric acid raw slag with 57.10% iron grade, iron concentrate with iron grade of above 62% is received but iron grade of tailings is high and iron recovery of concentrate is only 47.95%. Beneficiation comparison experiments of gravity concentration using centrifugal separator, magnetic—flotation separation, and desliming—flotation process were conducted for iron recovery increasing. The results showed that optimal result can received by desliming—flotation process, iron concentrate with iron grade of 59.97%, iron recovery of 42.65% was received for iron increase of tailings, thus mixed concentrate with iron grade of 61.52%, comprehensive recovery of 70.15% was achieved.
    Au-As Paragenesis and Separation Mechanism in Dashui Gold Deposit in Gansu Province
    YANG Bin, PENG Xiu-Hong, ZHONG Yan-Liang
    2014, 30(06):  47-49. 
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    Au-As paragenesis and separation mechanism is analyzed from the perspective of distributing characteristic, migration forms and precipitation mechanism.The research results show that,the content of Au and As grows and declines simultaneously in early stage while grows and declines respectively in later stage. Besides that, they are not overlap in space.Temperature, pressure, pH as well as the similarity of crystal chemistry and geochemistry properties decide that Au and As are able to form clathrate of ［AuAs］2-、［Au(AsS2)］0、［Au(AsS3)］2- to migrate.In the main metallogenic period, due to the abundant selenium and scarce sulfur in ore-forming hydrothermal and the change of physical and chemical conditions, Au and As mineralize in earth crust by separating and precipitating.Au and As experience three stages of symbiosis separation and concentration in early stage、main stage and later stage of mineralization, which explains the origin of DaShui gold ore to some extent, puts forward the possibility mechanism of lacking sulfur from the angle of As and provides new idea for exploring similar ore deposit and finding new As ore deposit.
    Research on the Fluid Inclusions and Geological Characteristics of Sanshier zhan Gold Deposit
    JIN Hai-Bin, ZHANG Wen-Qiang, LIU Tao, WANG Chang-Jin, NIE Chun-Yu, XIN You-Tao
    2014, 30(06):  50-53. 
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    Based on the analysis on the mining area geological characteristics and ore deposit geological characteristics of Sanshier'zhan gold deposit,the petrographic characteristics,geological properties and the parameters values such as uniform temperature,salinity and density of the fluid inclusions in Sanshier'zhan gold deposit are discussed.Besides that,genius of mineral deposit of Sanshier'zhan gold deposit is analyzed in detail.
    Application of Close-range Photogrammetry in Dry Beach of Tailings Pond Monitoring
    ZHANG Ji-Feng, LI Shao-Bo
    2014, 30(06):  54-57. 
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    Close-range photogrammetry method is applied to monitor the dry beach of mine tailing pond.The dry beach online monitoring system includes some control points,two network cameras and devices of communication,power supply and display.The stereo images are matched by extracting and identifying the line and surface-based features of stereo images by means of software.According to the features extracting and images matching results,the targets of stereo images are measured and positioned automatically to obtain the the parameters of dry beach. Combined with practical application,the measurement data are processed and measurement accuracy are analyzed.The research results show that,close-range photogrammetry method has a good prospect in monitoring dry beach of tailings.
    Research on the Strata Behavior Regularity and Control Technology of the Fully Mechanized Caving Faces
    LIU Hua-Jiang
    2014, 30(06):  78-80. 
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    Based on computing and analyzing the mine pressure observation data of 2401 working face,the strata behavior regularity and the surface displacement regularity of mining roadway are researched, besides that,the the adaptability of powered supports are analyzed.The research results show that,selecting of powered supports are reasonable and adaptability of the powered supports are good,which can provide a reference to the similar conditions for controlling of the mine pressure and selection of the hydraulic supports.
    Research on the Prevention and Control Technique of the Impact Ground Pressure of the Deep Irregular Island Mining Face
    SUN Bing-Xing
    2014, 30(06):  81-83+89. 
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    Combing with the field practice, the theoretical analysis method and numerical simulation method are adopted to analyze occurrence mechanism of the impact ground pressure of the deep irregular island mining face and explore the prevention and control technique of the impact ground pressure of the deep irregular island mining face. The working face roadways are deployed in low stress areas and the unloading lanes are diverted in irregular areas so as to form stress buffer to prevent and control the impact ground pressure. The research results of this paper can provide some reference for the design of irregular island mining face in deep mine.
    Research on the Treatment Measures and Landslide Causes of Hongtao Mountain in Nanping City
    YANG Yun-Lin
    2014, 30(06):  84-86+89. 
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    The geological environment conditions of Hongtao mountain landslide in Nanping city are investigated and the soil structure,perimeter, deformation characteristics, influence factors and mechanism of deformation and fracture of the landslide are analyzed in depth. The analysis results show that, the landslide is shown as “slipping-cracking-cutting”. According to the landslide causes, some related measures are taken, the upside of landslide is conducted cutting and load shedding, the local part of landslide is dealt with anchor rod latticing and slide-resistant pile, the slope toe of landslide is reinforced by slide-resistant pile. So, the good application effects are obtained.
    Application of Analytic Hierarchy Process in the Evaluation on the Effects of Wetting Dust Suppression
    YAO Jian, WU Ai-Xiang, HU Yan-Kang, TIAN Dong-Mei
    2014, 30(06):  87-89. 
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    According to the principle of analytic hierarchy process, the comprehensive evaluation model of influence factors of dust wetting dust suppression is established so as to analyze the surface tension, wetting time and the degree of coal metamorphism. The research results show that, the effects of wetting dust suppression can be evaluated compressively by this model.
    Monitoring and Analysis on the Stability of the Bottom Structural of the Stope of Multi-step Stoping
    ZHANG Liang-Gui
    2014, 30(06):  90-91+97. 
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    The roadway surrounding rocks deformation of stope bottom structure of lines to 50 and 52 of -760 m level of Dongguashan copper mine are monitored.The cumulative displacement and deformation rate are adopted so as to analyze the stability of roadway surrounding rocks.Besides that,the stability of surrounding rocks of roadway is evaluated by roadway surrounding stability index.
    Analysis on Mechanical Characteristics and Proportion of Paste Filling Similar Material
    LI Jiao
    2014, 30(06):  117-119+130. 
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    According to the actual situation of 2351 working faces of a mine,the mechanical characteristics and formula ratio of paste filling similar material are analyzed. So, the optimal proportion of filling material P10 is obtained under the conditions of laboratory similarity.