Liquid purification or separation – Filter – Movable medium
Patent
1988-06-29
1989-07-04
Fisher, Richard V.
Liquid purification or separation
Filter
Movable medium
210411, 162261, 209271, B01D 3324, B01D 4104
Patent
active
048447897
ABSTRACT:
A slurry of comminuted cellulosic fibrous material (e.g. paper pulp) is acted upon so that particles contained in the slurry are separated out from the slurry and introduced into a second liquid flow, while maintained under superatmospheric pressure. A partition divides a liquid tight pressure resistant vessel into first and second distinct chambers isolated from each other except by a slit at a mid-portion. An inlet for the slurry and an outlet for the first liquid are connected to the first chamber, and an inlet for the second liquid and an outlet for the second slurry to the second chamber. A screening disk is mounted for rotation in the vessel so that it fills the slit, with portions disposed in both the first and second chambers. The screening disk comprises a screen sandwiched between first and second circular plates which have aligned through-extending openings, the openings in the first plate, and the screen, defining pockets in which separated particles are captured for transfer from the first chamber to the second chamber. The first chamber may be much larger than the second chamber so that thickening of the pulp slurry can be accomplished.
REFERENCES:
patent: 2051079 (1936-08-01), Faber et al.
patent: 2183578 (1939-12-01), McNeal
patent: 2184177 (1939-12-01), Burrell
patent: 2382656 (1945-08-01), Obenshain et al.
patent: 4543181 (1985-09-01), Greenwood
patent: 4657636 (1987-04-01), Satomi
patent: 4680108 (1987-07-01), Ahs
patent: 4699324 (1987-10-01), Ahs
patent: 4781825 (1988-11-01), Grimes et al.
Kamyr Bulletin, No. 8, Apr., 1949, J. Richter, pp. 1 and 7.
Rydholm, "Continuous Pulping Processes", Special Technical Association Publication, Stap No. 7, copyright 1970, pp. 1 and 2.
Fisher Richard V.
Kamyr AB
Millard Wanda L.
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