Dual alkali scrubber liquor regeneration with production of gypsum
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United States of America Patent
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-
Sep 10, 1985
Issued Date -
N/A
app pub date -
Jul 30, 1984
filing date -
Jun 10, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for the recovery of gypsum as a product of a dual alkali system for regeneration of a sodium base alkaline scrubber liquor in which the liquor reacts with ground limestone in two serially connected sludge blankets containing from 15%-40% solids in a liquor matrix and overlain by a relatively clear supernatant pool. Upon completion of regeneration the liquor is discharged from the second blanket to the scrubber cycle while a proportionate amount of the slurry is further treated to reduce its pH and/or increase its density and/or to displace regenerated scrubber from the matrix after which the slurry is transferred to a separate tank and there oxidized to gypsum then it is filtered. The filtrate is returned to the liquor regeneration cycle and the gypsum recovered as product.
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