Grinding Efficiency of an Agitation-Beads Mill (I)

Characteristics of the Particle Size Distribution of the Ground Product

Abstract

Particle size distributions of CaCO₃ ground by an agitation-beads mill were analyzed. A horizontal type mill equipped with perforated discs was used. Calcium carbonate was put into the mill with water to give 10% slurry, and the CaCO₃ was ground under various conditions. Particle size distribution was approximated by a mono or bimodal-logarithmic normal distribution. Geometric mean and standard deviation of the smaller particle size group were determined only by the energy consumption. The bimodal distribution with the undesired larger particle fraction, F_L, appeared when the degree of media filling was small. The fraction F_L, depended on the residence time of the specimen but not on energy consumption.