Abstract
The impact energy of grinding ball and the moving state of medium are the direct factors that affect the grinding effect of ball mill. The structure of liner is closely related to both. In order to further study the influences of impact energy and medium motion on the grinding effect of liner structure, especially stepped liner structure, the paper studies the effect that the friction angle of liner, the height difference of liner and the arc angle of liner on these two aspects of the ball mill by the method of control variables and discrete element analysis. Through the research of the paper, the power of the ball mill increases with the increase of the friction angle. The higher the energy is, the less the number of impact is, the number of impact on the liner with the lower friction angle will reduce quickly. The effect of the mill's power is minimal; the stepped liner has a high number of impact at low energy and a low number of impact at high energy. The research results provide theoretical support and scientific basis for the reasonable design of liner and the efficiency of ball mill.
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