Method for treating process water in connection with pulp bleaching
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United States of America Patent
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Sep 18, 2001
Issued Date -
N/A
app pub date -
Aug 31, 2000
filing date -
Mar 2, 1998
priority date (Note) -
Expired
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Abstract
A method treats process water containing metal ions, in connection with bleaching of lignocellulosic pulp. The method is characterized by the steps of a) adjusting the Mg.sup.2+ content of the process water to form a flocculating base for metals and an organic substance; b) supplying a carbonate source to the process water to precipiate calcium as calcium carbonate; c) increasing the pH of the process water by adding white liquor to precipipate metals such as metal hydroxides; d) adding a flocculating agent to the process water; and e) separating the precipitated, flocculated metal compounds from the process water by flotation.
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