Abstract
Fine grinding is a complex engineering art about which little is known. The general comminution theories are reviewed. These include comminution of homogeneous substances considering particle shape, and heterogeneous materials broken under uniform stress as well as non-uniform stress. A general theorem is proven, demonstrating that the size distribution in the finer sizes is independent of many parameters that affect the larger size distribution. Recent three-dimensional comminution model work is reviewed, and its implication on the effect of particle characteristics such as shape are discussed. Fine particle grinding by conventional means such as jet and hammer milling are reviewed against the background of modern comminution theory. A discussion of recognitive and non-recognitive properties of fine particles is presented in the light of the need of better particle characterization. Recent work in experimental particle characterization is also reviewed.
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