Abstract
Vibration ball milling was carried out using three mills of cylindrical, capsule and spherical type respectively with the same internal volume, and the specific surface area of the product was examined. An empirical equation of grinding rate applicable in the region of short grinding time (t <1800s) was proposed to investigate the effect of mill shape on grinding rate. It was found that the specific surface area was apparently influenced by the mill shape. Under the same operating conditions the specific surface areas of product by capsule and spherical mills were greater than that by the conventional cylindrical mill. The grinding rate by the spherical mill was found to be about 30% greater than that by the clindrical mill in terms of the empirical equation proposed.
