关键词: 立式棒条搅拌磨机　, 磨机转速　, 陶瓷球充填率　, 离散元法　, 碰撞次数　, 能量损失

Abstract: In the field of fine grinding in metal mines,the vertical stirred mill is an efficient and energy-saving device, where mill speed and medium filling rate are the key factors affecting its grinding performance.This paper systematically inves tigates the effects of rotation speed and filling rate on the collision behavior of ceramic ball media in a vertical bar stirred mill using the discrete element method (DEM).The results show that under the operating conditions of the vertical bar stirred mill, the tangential energy loss of ceramic ball collisions is significantly greater than the normal energy loss,and the breakage mecha nism is dominated by attrition.Both rotation speed and filling rate follow a power function relationship with energy loss and are positively correlated;Rotation speed follows a GaussMod function relationship with collision frequency,while filling rate exhibits a positive linear correlation with collision frequency.Analysis combining simulation data and equipment structure reveals that the vertically and equidistantly distributed bars,constrained by interlayer spacing,exert non-uniform effects on the media.This necessitates tracking characteristic media particles at different heights within the cylinder,rather than using the entire medium assembly,for studies involving media motion trajectories.