Mixing of Solids

Abstract

Publisher Summary This chapter describes mixing of solids. It discusses state of mixing of a batch of solids, theoretical frequency distributions, rate equations, and equipment. Wherever a solids mixer is necessary, focus must be to the handling of the batch after mixing. The mixer may turn out an excellent product, but subsequent handling may render it unsatisfactory for the next step in the process. Dumping, shaking during transportation, vibrating, and flow through silos are some of the steps frequently following batch mixing. The process control point of view of mixing solids looks for statistical ways to treat the solids mixing operation, to produce an output within certain specifications. The equipment building point of view relies on individual tests, with non-statistical judgment as to whether the final product is well mixed. Useful methods are now available to carry out fruitful investigation of both the experimental and theoretical aspects of the unit operation of solids mixing. This chapter illustrates sampling considerations, statistical techniques, rate equations, theoretical frequency distributions, equipments required and critical evaluation of processes of mixing of solids.