Brittle fracture in crystallization processes Part A. Attrition and abrasion of brittle solids

In chemical engineering processes in which solids are produced or handled, the strength of the substance plays a key role. The following presents a co mprehensive model for one of these processes, crystallization from suspensi ons. When crystallization kinetics are determined by the formation of fragm ents and their subsequent growth, the developed model equations can predict the whole crystallization process in a quantitative manner. The size depen dent growth behaviour of fragments is explained by the attrition process it self. The predicted influence of material properties on the fracture behavi our of a great number of crystalline substances as well as the suggested gr owth function for attrition fragments compare well with experimental result s. The model equations can be used to estimate when and how brittle fractur e will occur in chemical engineering processes and, more specifically, to s cale-up suspension crystallizers, (C) 1999 Elsevier Science Ltd. All rights reserved.