半自磨机中矿石颗粒形状对轴向偏析的影响研究

Study on the Effect of Ore Particle Shape on Axial Segregation in the SAG Mill

针对半自磨机内部矿石颗粒运动状态不易观察及颗粒分布不明确等问题,采用离散元法对比研究半自磨机中非球形与球形矿石颗粒对颗粒轴向偏析的影响。结果表明,非球形颗粒增大了颗粒床层的动态休止角,运动状态更为激烈,筒体颗粒具有更大的动能;颗粒粒径差异导致发生大颗粒聚集在筒体端盖附近区域而小颗粒积聚在筒体中间区域的轴向偏析现象,但非球形颗粒比球形颗粒的轴向偏析现象更为明显。

In view of the problems that it is difficult to observe the movement state of ore particles inside the semi-autogenous mill and the unclear distribution of particles,the discrete element method is used to study and compare the influence of non-spherical and spherical ore particles on axial segregation in the semi-autogenous mill.The results show that non-spherical particles increase the dynamic angle of repose of the particle bed,and the motion state is more intense,and the particles in the cylinder have greater kinetic energy.The difference in particle size leads to the axial segregation phenomenon that large particles accumulate in the area near the end cover of the cylinder,while small particles accumulate in the middle area of the cylinder.However,the axial segregation phenomenon of non-spherical particles is more obvious than that of spherical particles.