The fundamentals of wet classification are described and a scientific basis for solving classification is presented. For the practical engineer, there is an overview of the technical solutions available.Preface. Definitions. Classification theory. Classifier performance. Material balance calculations. Wet classifier types. Gravitational classifiers. Centrifugal classifiers. Mathematical modelling for classifiers. The effects of classifier operation on grinding circuit behaviour. China clay classification. Appendix 1: Formulas for pulp. References. Index.