MODELS FOR DEAGGLOMERATION AND FRACTURE OF PARTICULATE SOLIDS

Models for deagglomeration of aggregates of particles by compressible flow systems and for the fracture of particles by impact grinding have been developed, leading to a prediction of particle-size distributions, i.e., quasi- logarithmico-normal distributions, with a mean geometric standard deviation of 1.6 0.1. For aerodynamic deagglomeration, the size distribution is related to the compressible flow properties and intrinsic properties of the particulate solids. Impact grinding is shown to be governed by the impact probabilities proportional to the square of the Stokes equivalent spherical particle diameter. Data are presented in support of the models, and departures from the models are discussed.