Liquid purification or separation – Flow – fluid pressure or material level – responsive – Discharge of treated material
Patent
1977-02-28
1978-07-11
Hart, Charles N.
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Discharge of treated material
68181R, 210342, D21C 918, B01D 3300
Patent
active
041000692
ABSTRACT:
An 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 Screened liquid is withdrawn from the hollow mounting arms, and the hollow mounting arms and screen sets are axially reciprocated during the screening operation.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 preventing fluid communication between the interior of screens of the different screen sets, and two separate withdrawal devices are 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.
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Hart Charles N.
Kamyr Inc.
Spitzer Robert H.
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