| 摘要 |
<p>Procedure for separating finely divided matter from a suspension by filtration in a periodically operated pressure filter including a filter tank into which the suspension to be filtered is supplied along with lime sludge (or CaCO3) as a filtering auxiliary substance. The lime sludge forms a filtering layer on the surface of filtering elements and the suspension to be filtered passes through this layer for separating sediment. The pressure filter contains a plurality of filtering elements extending downwardly from the roof of the filter tank so that the filtrate flows through the elements to a superposed filtrate collecting tank. The lime sludge collects on the outer surface of the filtering elements and is periodically detached by a countercurrent washing operation. Green liquor, from which the soda sediment is to be separated, is used as the suspension to be filtered.</p> |
