Abstract

The applicability of the first-order law of grinding kinetics is widely observed. On the other hand, tests of compressive strengths of particles of a given size show a distribution of strengths, so that some particles appear weak and others strong, which would not lead to first-order kinetics of grinding. It is proposed that this paradox is partially resolved by considering the distribution of compressive strengths to arise from orientation of particles, so that a given particle would have an apparent distribution of strenghts if it could be fractured in different orientations.

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