Mining Science and Technology (China)最新文献

{"title":"Modeling the complex and long term swelling behavior of argillaceous rocks","authors":"R. Doostmohammadi, T. Mutschler, C. Osan","doi":"10.1016/J.MSTC.2011.10.007","DOIUrl":"https://doi.org/10.1016/J.MSTC.2011.10.007","url":null,"abstract":"","PeriodicalId":100930,"journal":{"name":"Mining Science and Technology (China)","volume":"62 1","pages":"655-659"},"PeriodicalIF":0.0,"publicationDate":"2011-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83993090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Abandoned coal mine tunnels＂ Future heating/power supply centers","authors":"Pingjia Luo, N. Chen","doi":"10.1016/J.MSTC.2011.10.011","DOIUrl":"https://doi.org/10.1016/J.MSTC.2011.10.011","url":null,"abstract":"","PeriodicalId":100930,"journal":{"name":"Mining Science and Technology (China)","volume":"18 1","pages":"637-640"},"PeriodicalIF":0.0,"publicationDate":"2011-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86607795","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Active velocity tomography for assessing rock burst hazards in a kilometer deep mine","authors":"He Hu ,&nbsp;Dou Linming ,&nbsp;Li Xuwei ,&nbsp;Qiao Qiuqiu ,&nbsp;Chen Tongjun ,&nbsp;Gong Siyuan","doi":"10.1016/j.mstc.2011.10.003","DOIUrl":"10.1016/j.mstc.2011.10.003","url":null,"abstract":"<div><p>Active velocity tomography was used to determine the stress state and rock burst hazards in a deep coal mine. The deepest longwall face, number 3207 in the Xingcun colliery, was the location of the field trials. The positive correlation between stress and seismic velocity was used to link the velocity data with stratum stresses. A GeoPen SE2404NT data acquisition system was used to collect seismic data from 300<!--> <!-->g explosive charges fired by instantaneous electric detonator and located in the tail entry. The geophones were installed on the rock bolts in the head entry of LW3207. Velocity inversion shows an inhomogeneous distribution of stress in the longwall face that could not be obtained from theory or numerical simulations. Three abnormally high P-wave velocity regions were identified that were located on the corners of the two roadways and at the face end near the rail entry side. The maximum velocity gradient is located at the open cut off near the rail entry and is the area most dangerous for rock burst. Mining-induced tremors recorded by a micro-seismic monitoring system demonstrated that the position of energy release during mining coincides with the high velocity gradient area. This technology aids technicians in the coal mine as they design measures to weaken or eliminate potential danger during subsequent mining.</p></div>","PeriodicalId":100930,"journal":{"name":"Mining Science and Technology (China)","volume":"21 5","pages":"Pages 673-676"},"PeriodicalIF":0.0,"publicationDate":"2011-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mstc.2011.10.003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86854442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Explosive characteristics of nanometer and micrometer aluminum-powder","authors":"Jiang Bingyou ,&nbsp;Lin Baiquan ,&nbsp;Shi Shulei ,&nbsp;Zhu Chuanjie ,&nbsp;Li Wenxia","doi":"10.1016/j.mstc.2011.10.006","DOIUrl":"10.1016/j.mstc.2011.10.006","url":null,"abstract":"<div><p>The explosive characteristics of aluminum powder have great significance in preventing and controlling aluminum-dust explosion accidents, especially the nano-aluminum powder. The explosion characteristics of 100<!--> <!-->nm and 75<!--> <!-->μm aluminum powders were investigated by using a 20 L spherical explosion cavity and a horizontal pipe whose cross-section area is 80<!--> <!-->mm<!--> <!-->×<!--> <!-->80<!--> <!-->mm and length is 8<!--> <!-->m. The results show that the maximum explosion pressure and its rising rate of 100<!--> <!-->nm aluminum powder gradually increase with increasing concentration of aluminum-powder at the beginning. When aluminum-powder concentration is 1<!--> <!-->kg/m³, the maximum explosion pressure reaches its maximum, and then gradually decreases. While when the concentration is 1.25<!--> <!-->kg/m³, the maximum rate of pressure rise obtains its maximum, and then decreases. After 100<!--> <!-->nm aluminum powder is exploded in pipes, the peak overpressure of blast wave first decreases and then increases to the maximum at a distance of 298<!--> <!-->cm from the ignition source, and then gradually decreases. The most violent concentration is about 0.4<!--> <!-->kg/m³ which is lower than 0.8<!--> <!-->kg/m³ of 75<!--> <!-->μm aluminum powder, so 100<!--> <!-->nm aluminum powders are more easily exploded. The change laws of maximum explosion pressure, maximum rate of pressure rise and blast-wave peak overpressure of 100<!--> <!-->nm aluminum powders with concentration are similar to those of 75<!--> <!-->μm aluminum powders, but these values are much higher than 75<!--> <!-->μm aluminum powders under the same concentration, so the aluminum-powders explosion of 100<!--> <!-->nm will produce more harms. In the process of production, storage and transportation of aluminum powder, some relevant preventive measures can be taken to reduce the loss caused by aluminum-dust explosion according to nano-aluminum dust.</p></div>","PeriodicalId":100930,"journal":{"name":"Mining Science and Technology (China)","volume":"21 5","pages":"Pages 661-666"},"PeriodicalIF":0.0,"publicationDate":"2011-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mstc.2011.10.006","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75858812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Beneficiation of a low grade limestone sample","authors":"Rao Danda Srinivas,&nbsp;Vijayakumar Tadiparthi Venkata,&nbsp;Subba Rao Sripada,&nbsp;Bhaskar Raju Guntamadugu,&nbsp;Prabhakar Swarna","doi":"10.1016/j.mstc.2011.10.012","DOIUrl":"10.1016/j.mstc.2011.10.012","url":null,"abstract":"<div><p>Pilot scale column flotation studies were conducted on a low grade siliceous limestone ore. Silica content was reduced to less than 1% in the concentrate so that it became satisfactory for use in the paper or rubber industries. The limestone sample was crystalline and constituted primarily of calcite that contained quartz, feldspar, pyroxene, and biotite as gangue minerals. Quartz is the major silicate gangue whereas feldspar, pyroxene, and biotite exist in minor to trace quantities. Traces of pyrite were also observed within the sample. A reverse flotation process was adopted where the silicate gangue minerals were floated using two different commercial cationic collectors: Chem-750 F or Floatamine-D. The studies clearly suggest it is possible to produce a limestone concentrate assaying around 96–97% CaCO₃ containing less than 1% SiO₂. The effect of feed flow rate, percent solids, froth depth, and wash water on the grade and recovery of the CaCO₃ concentrate is discussed.</p></div>","PeriodicalId":100930,"journal":{"name":"Mining Science and Technology (China)","volume":"21 5","pages":"Pages 631-636"},"PeriodicalIF":0.0,"publicationDate":"2011-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mstc.2011.10.012","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84584904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Parameters analysis of shearer drum loading performance","authors":"Songyong Liu, C. Du, Jia Jia Zhang, Hao Jiang","doi":"10.1016/J.MSTC.2011.10.005","DOIUrl":"https://doi.org/10.1016/J.MSTC.2011.10.005","url":null,"abstract":"","PeriodicalId":100930,"journal":{"name":"Mining Science and Technology (China)","volume":"27 1","pages":"621-624"},"PeriodicalIF":0.0,"publicationDate":"2011-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77824302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of sintered metal distributor on fluidization quality of the air dense medium fluidized bed","authors":"Yang Xuliang,&nbsp;Zhao Yuemin,&nbsp;Luo Zhenfu,&nbsp;Chen Zengqiang,&nbsp;Song Shulei","doi":"10.1016/j.mstc.2011.03.009","DOIUrl":"10.1016/j.mstc.2011.03.009","url":null,"abstract":"<div><p>Dry coal beneficiation using an air dense medium fluidized bed (ADMFB) requires the formation of a stable and uniform bed from the dense medium. Others have shown that the structure and geometric parameters of the air distributor have a significant influence on the experimentally observed fluidization quality. In this study we used a sintered metal distributor (SMD) in the ADMFB separator and study its effect on the fluidization quality. The results show that for the same open area ratio (OAR), a smaller aperture in the SMD will provide improved fluidization quality. If aperture size is held constant bigger open area ratios result in improved fluidization quality. And, the fluidization quality also improves when the pressure drop across the SMD increases. A model relating distributor pressure drop and the geometric parameters of the SMD is also proposed.</p></div>","PeriodicalId":100930,"journal":{"name":"Mining Science and Technology (China)","volume":"21 5","pages":"Pages 681-685"},"PeriodicalIF":0.0,"publicationDate":"2011-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mstc.2011.03.009","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72915524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Simulation of the screening process on a circularly vibrating screen using 3D-DEM","authors":"Zhao Lala ,&nbsp;Zhao Yuemin ,&nbsp;Liu Chusheng ,&nbsp;Li Jun ,&nbsp;Dong Hailin","doi":"10.1016/j.mstc.2011.03.010","DOIUrl":"10.1016/j.mstc.2011.03.010","url":null,"abstract":"<div><p>A numerical study of the motion particulates follow along a circularly vibrating screen deck was done using the three dimensional Discrete Element Method (DEM). The motion of the particles was analyzed. The effects of vibration amplitude, throwing index, and screen deck inclination angle on the screening process are discussed. The results show that the average velocity of the particles increases along the longitudinal direction of the deck. The screening efficiency is highest when the vibration amplitude, throwing index, and screen deck inclination angle are 3–3.5<!--> <!-->mm, 2.7 and 15°, respectively. This work is helpful for developing a deep understanding of particle motion and for optimizing screen separator designs.</p></div>","PeriodicalId":100930,"journal":{"name":"Mining Science and Technology (China)","volume":"21 5","pages":"Pages 677-680"},"PeriodicalIF":0.0,"publicationDate":"2011-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mstc.2011.03.010","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84508764","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of coal gangue on the level of main trace elements in the shallow groundwater of a mine reclamation area","authors":"Li Wei,&nbsp;Chen Longqian,&nbsp;Zhou Tianjian,&nbsp;Tang Qibao,&nbsp;Zhang Ting","doi":"10.1016/j.mstc.2011.03.004","DOIUrl":"10.1016/j.mstc.2011.03.004","url":null,"abstract":"<div><p>Coal gangue is the most used filling material during reclamation of areas suffering subsidence from mining. Main trace element levels (F, As, Hg, and Pb) in shallow groundwater in the reclamation area may be affected by leaching from the gangue. This can has an impact on the application of the water for agricultural irrigation or use as drinking water. Therefore, it is of great significance to understand the effect coal gangue has on the shallow groundwater of a reclaimed area. We studied the effect of coal gangue on fluorine, arsenic, mercury, and lead levels in the shallow groundwater of a reclamation area by testing the water and the coal gangue. One well near the reclamation area was used as a control well and element levels in water from this well and from the soil next to the well were also measured. The results show that the levels of these elements are increasing in the reclamation area over time. The increase in fluorine, arsenic, mercury, and lead in monitor wells varies from 7.42% to 8.26%, from 7.13% to 7.90%, from 4.85% to 6.48%, and from 4.69% to 6.42%, respectively. Fluorine and arsenic levels are lower in monitor wells than in the control water. The other elements are found in greater concentration than in the control. The Nemerow index also indicates that the shallow groundwater in the reclamation area I is moderately affected by the back-filling coal gangue, while the shallow groundwater in the reclamation area II and III are slightly affected by the back-filling coal gangue. This shallow groundwater could be used for agricultural irrigation or for drinking.</p></div>","PeriodicalId":100930,"journal":{"name":"Mining Science and Technology (China)","volume":"21 5","pages":"Pages 715-719"},"PeriodicalIF":0.0,"publicationDate":"2011-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mstc.2011.03.004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83634043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modeling seismic wave propagation in a coal-bearing porous medium by a staggered-grid finite difference method","authors":"Zou Guangui,&nbsp;Peng Suping,&nbsp;Yin Caiyun,&nbsp;Deng Xiaojuan,&nbsp;Chen Fengying,&nbsp;Xu Yanyong","doi":"10.1016/j.mstc.2011.03.002","DOIUrl":"10.1016/j.mstc.2011.03.002","url":null,"abstract":"<div><p>A staggered-grid finite difference method is used to model seismic wave records in a coal bearing, porous medium. The variables analyzed include the order of the difference calculations, the use of a perfect match layer to provide absorbing boundary conditions, the source location, the stability conditions, and dispersion in the medium. The results show that the location of the first derivative of the dynamic variable with respect to space is coincident with the location of the first derivative of the kinematic variable with respect to time. Outgoing waves are effectively absorbed and reflection at the boundary is very weak when more than 20 perfect match layer cells are used. Biot theory considers the liquid phase to be homogeneous so the ratio of liquid to solid exposure of the seismic source depends upon the medium porosity. Numerical dispersion and generation of false frequencies is reduced by increasing the accuracy of the difference calculations and by reducing the grid size and time step. Temporal second order accuracy, a tenth order spatial accuracy, and a wavelength over more than ten grid points gave acceptable numerical results. Larger grid step sizes in the lateral direction and smaller grid sizes in the vertical direction allow control of dispersion when the medium is a low speed body. This provides a useful way to simulate seismic waves in a porous coal bearing medium.</p></div>","PeriodicalId":100930,"journal":{"name":"Mining Science and Technology (China)","volume":"21 5","pages":"Pages 727-731"},"PeriodicalIF":0.0,"publicationDate":"2011-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mstc.2011.03.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81224842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}