Treatment of waste paper
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United States of America Patent
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-
Nov 4, 1997
Grant Date -
N/A
app pub date -
May 10, 1996
filing date -
May 12, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for recovering inorganic material from an effluent suspension produced in the treatment of waste paper. The effluent suspension, in the form of an aqueous suspension containing at least 2% by weight of dry solids, is contacted with an oxygen-containing gas at an elevated temperature, and at an elevated pressure sufficient to keep the water component of the sludge in the liquid phase, for a time sufficient to effect substantially complete oxidation of the organic material in the suspension. The resulting product is dewatered and then resuspended in water, whereafter there is separated from the suspension water containing fine carbon particles in suspension to leave the desired inorganic material.
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