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Ball mill tests on laboratory scale were carried out in order to study the influence of particle shape on grindability. The sample used was 1362g, 10, 000 pieces of 4×6 mesh limestone. The shape index defined by (diameter of a circumcircle/thickness) was measured manually with great care by slide caliper and the particles were classified into two groups on the basis of the shape index. The grinding mill used was made of stainless steel and its volume was about 2.7 liters. The grinding medium charged also consisted of 144 stainless steel balls of diameter 1.9cm. The mill was always run at a rotational speed of 112rev./min. It was found that the shape index of feed material affects the decreasing rate of mass fraction of feed size and the increasing rate of fine particles.

Influence of Particle Shape on Ball Mill Grindability.