| 摘要 |
<p>In a waste paper recovery floatation process a fibrous suspension is aerated in a multi-stage process (P1-P4, S1-S2), each with a discrete liquid circulation system (6). Each stage selectively removes a particular impurity in or between a primary or secondary cell. Also claimed is a commensurate assembly in which the concentration of suspended fibres is reduced to 0.8-1.3% prior to admission to secondary cells. The process further incorporates one or more intermediate cleaners (12) that are located in accordance with the particular process requirements and the degree of cleansing required in the primary cells. Alternatively or in addition, a cleaner (12') may be installed in a secondary cell circuit immediately after an injector pump (13) operating at higher pressure than prior art.</p> |
