Population balance modelling of dense clay slurries flocculation

Abstract

A novel mathematical model based on first principles is developed to simulate flocculation process of dense clay slurries. The model takes into account all major physical processes taking place during flocculation. In addition to multi-phase flow and turbulence, the model accounts for polymer mixing, floc formation and fractal growth of aggregates, floc breakage, rheological changes during flocculation, and changes of the flow regime. Population Balance Method is employed to track the evolution of floc size distribution numerically. The developed model is applied to a batch flocculation process in a mixing vessel with an impeller, and the results are analyzed and compared with experiments. The model helps understanding of the complex interactions between different phenomena taking place during flocculation.