Filter cake scraping method and rotary drum filter using the same
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United States of America Patent
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-
Nov 16, 1993
Grant Date -
N/A
app pub date -
Feb 5, 1992
filing date -
Feb 16, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
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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Cited Art Landscape
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