Two-stage pulp thickening

Details Two-stage pulp thickening Two-stage pulp thickening

D - Textiles, Paper

21

C

92/60

D21C 9/18 (2006.01) B01D 35/22 (2006.01)

Patent

CA 1063408

ABSTRACT OF THE DISCLOSURE A method and apparatus for thickening pulp at the bottom of a diffusion washing tower. Two sets of concentric screens are provided, each screen set comprising a plurality of radially spaced screens, the screens of one of the screen sets being radially offset from the screens of other screen sets. A plurality of hollow mounting arms each commonly mount the screen sets and are in operative fluid communication with at least some of the screens of the screen sets. Screened liquid is withdrawn from the hollow mounting arms, and the hollow mounting arms and screen sets are axially reciprocated during the screening operation. Control of the homogeneity of the pulp is effected by pre- venting fluid communication between the interior of screens of the different screen sets, and two separate withdrawal devices axe provided, one for withdrawing liquid only from one of the screen sets, and one for withdrawing liquid only from the other of the screen sets. The operation of the two withdrawal structures can be controlled so that extraction flow rates from the sets are substantially equal.

297371

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