Chromium hydroxide precipitate obtained by a continuous process for the removal of chromium from waste waters
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United States of America Patent
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Dec 24, 1985
Issued Date -
N/A
app pub date -
Apr 13, 1983
filing date -
May 12, 1980
priority date (Note) -
Expired
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Abstract
A chromium hydroxide precipitate obtained by a continuous process is described, wherein chromium containing waste waters are subjected to continuous hot treatment with acetic acid or with alkaline acetates and alkaline hydroxides at a temperature from 40.degree. C. to boiling point and at atmospheric pressure, at a pH higher than 6.5, preferably between 7 and 10, particularly about 7.5. Thus, a 'sandy' type of chromium hydroxide is obtained, having a titer in Cr.sub.2 O.sub.3 of 20 to 40% by weight, which quickly filters, is easily soluble in acids, and thereby affords an easy valorization both as a tanning agent and as a raw material for preparing other chromium compound.
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