Liquid purification or separation – Processes – Separating
Patent
1992-02-05
1993-11-16
Dawson, Robert A.
Liquid purification or separation
Processes
Separating
210784, 210791, 210402, 210408, B01D 3702, B01D 2102
Patent
active
052620697
ABSTRACT:
Disclosed are a filter cake scraping method which can scrape a filter cake layer deposited on the surface of a filter drum with a scrape blade even if the particles of the cake are fine, and a rotary drum filter using this method. When pressure inside a suspension vessel rises above a predetermined value, a control means quickly reduces the pressure. Accordingly, precoated material or the like, which has been deposited on the filter drum, expands to push a layer of filter cake outward, thus permitting a scrape blade provided beside the filter drum to scrape the expanded cake layer.
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patent: 4895647 (1990-01-01), Uchiyama
patent: 5078878 (1992-01-01), Charette
Dawson Robert A.
Fortuna Ana M.
FSK Inc.
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