Process for removing and washing dregs from green liquor in a kraft pulp mill
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United States of America Patent
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Jan 6, 1998
Grant Date -
N/A
app pub date -
Jun 15, 1994
filing date -
Jun 15, 1994
priority date (Note) -
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Abstract
In a kraft pulp mill, a process and apparatus for removing and washing dregs from green liquor so that the pH of the dregs is below 'hazardous waste' levels. Specifically, green liquor clarifier underflow is filtered using a simple non-precoat cassette filter to form a first dregs cake. The dregs cake is diluted, preferably with water. The diluted dregs cake is then filtered in a precoat dregs filter to produce a dregs cake that is at least 50% solid and has a pH of about 12.0 or less.
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