Particle size distribution of coal and gangue after impact-crush separation  

作　　者：YANG Dao-long LI Jian-ping DU Chang-long ZHENG Ke-hong LIU Song-yong 杨道龙;李建平;杜长龙;郑克洪;刘送永

机构地区：[1]School of Mechatronic Engineering, China University of Mining & Technology [2]College of Mines and Earth Sciences, University of Utah

出　　处：《Journal of Central South University》2017年第6期1252-1262,共11页中南大学学报（英文版）

基　　金：Project(2012AA062102)supported by High-Tech Research and Development Program of China;Project(KYLX_1379)supported by the Innovation Training Project of Graduate Student in Jiangsu Province,China;Project supported by the Priority Academic Program Development of Jiangsu Higher Education Institutions,China

摘　　要：Based on the separation and backfilling system of coal and gangue, the mineral material impact experiments were conducted utilizing the hardness difference between coal and gangue according to the uniaxial compression experiments. The broken coal and gangue particles were collected and screened by different size meshes. The particle size distributions of coal and gangue under different impact velocities were researched according to the Rosin-Rammler distribution. The relationships between separation indicators and impact velocities were discussed. It is found from experiments that there is a fully broken boundary of coal material. The experimental results indicate that the Rosin-Rammler distribution could accurately describe the particle size distribution of broken coal and gangue under different impact velocities, and there is a minimum overlap region when the impact velocity is 12.10 m/s which leads to the minimum mixed degree of coal and gangue, and consequently the benefit of coal and gangue separation.Based on the separation and backfilling system of coal and gangue, the mineral material impact experiments were conducted utilizing the hardness difference between coal and gangue according to the uniaxial compression experiments. The broken coal and gangue particles were collected and screened by different size meshes. The particle size distributions of coal and gangue under different impact velocities were researched according to the Rosin-Rammler distribution. The relationships between separation indicators and impact velocities were discussed. It is found from experiments that there is a fully broken boundary of coal material. The experimental results indicate that the Rosin-Rammler distribution could accurately describe the particle size distribution of broken coal and gangue under different impact velocities, and there is a minimum overlap region when the impact velocity is 12.10 m/s which leads to the minimum mixed degree of coal and gangue, and consequently the benefit of coal and gangue separation.

关 键 词：Rosin-Rammler distribution impact CRUSH SEPARATION indicator COAL and GANGUE SEPARATION and BACKFILLING system 

分 类 号：TD94[矿业工程—选矿]