Process for extracting pure, coarse grain silicic acid crystals from spent lye
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United States of America Patent
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Mar 24, 1998
Grant Date -
N/A
app pub date -
Jun 21, 1996
filing date -
Dec 23, 1993
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Expired
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Abstract
A process is disclosed for extracting pure, coarse-grain silicic acid crystals from silicic acid-containing spent lye in cellulose production, comprising adding coarse-grain silicic acid to alkalized spent lye, lowering the pH of the alkalized spent lye to about 9 such that a sediment is formed, separating the sediment formed into coarse grain and fine grain silicic acid with little lignin and lignin-containing spent lye free from silicic acid, and separating the coarse grain and fine grain silicic acid with little lignin into course grain silicic acid and lignin. At least part of the course grain silicic acid separated is fed back to the alkalinized spent lye to be desilicified.
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