Process for filtering green liquor using lime sludge as a...

Details Process for filtering green liquor using lime sludge as a... Process for filtering green liquor using lime sludge as a...

B - Operations, Transporting

01

D

9/36.7

B01D 37/02 (2006.01) B01D 29/00 (2006.01)

Patent

CA 1180855

ABSTRACT OF THE DISCLOSURE The present invention provides a process for separa- tirg finely divided material from a suspension by filtration in a periodically operating pressure filter comprising a filter tank, into which is supplied to act as auxiliary filtering substance, lime sludge or CaC03, to form a filtering layer on the surface of the filtering elements, and the suspension to be filtered. The pressure filter contains a plurality of suspend- ed filtering elements suitably hanging down from the roof and through which the filtrate flows, the interior of said filtering elements commnunicates with a filtrate collecting tank disposed thereabove. The filtering elements collect sludge on their outer surface, which sludge is periodically detached by count- ercurrent washing. The suspension to be filtered is green liquor, from which the soda sediment is separated.

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