Method for the production of green liquor
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United States of America Patent
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-
Sep 18, 2007
Grant Date -
Apr 13, 2006
app pub date -
Nov 21, 2003
filing date -
Nov 25, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The method is for production of green liquor in association with a causticizing process during recovery of chemicals in manufacture of sulphate pulp. A smelt (14) of chemicals principally consisting of Na2S and Na.sub.2CO.sub.3 from a soda boiler (1) is provided. Weak liquor (15) that contains dissolved NaOH and CaO is provided. A dissolving tank (2) is provided in which the smelt (14) from the soda boiler (1) is dissolved in the weak liquor (15) it order to form green liquor (16). A solution of NaOH is added to the weak liquor (15), at a position before the weak liquor (15) is added to the dissolving tank, in order to increase the concentration of NaOH in the weak liquor (15) such that a fraction of CaO that is presently dissolved in the weak liquor (15) precipitates.
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