Abstract
Washing is an operation that takes place in all kinds of pulp production. The design and operation of a washing plant is of great importance, especially when considering production of chemical pulp such as kraft pulp and sulfite pulp. Also, mechanical pulps need to be washed before further treatment. Pulp washing is used in brown stock washing after cooking, after oxygen delignification, and in bleaching. General introduction on pulp washing, methods of pulp washing, washing efficiency calculations, washing system variables, washing equipment, use of additives/processing aids in washing are presented in this chapter.
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