Motion of Grinding Media in Axial Direction and its Effect on Comminution in an Agitation Beads Mill

Abstract

Grinding tests were carried out using a model agitation beads mill with a single disc. Four different discs were used to examine the effect of the motion of the grinding media in the axial direction. The median diameter of the ground products decreased with increasing movement of the grinding media in the axial direction under the same degree of filling of the grinding media and speed of rotation. Contamination in the product from the agitating element and grinding vessel increased with increasing energy input, irrespective of the shape of the agitating disc. Contamination from the grinding media increased with increase in the movement of grinding media in axial direction. The motion of grinding media in the axial direction is concluded to cause mutual collision and hence to increase abrasion of the grinding media.