Controlling fines concentration in waste paper suspensions, separates two streams from washer for direct return and adjustment of fines content

摘要

Filtrate (6) from the wash unit (1) is divided into supplementary (A) and dilution (B) fractions. The supplementary fraction (A) is returned directly to the acceptable material (5). The dilution fraction (B) is adjusted before addition, such that the thickened suspension (S') in the filter unit (2) has the required fines content.