Dewatering of alumina trihydrate
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United States of America Patent
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Apr 30, 1991
Grant Date -
N/A
app pub date -
Sep 15, 1989
filing date -
Jun 30, 1988
priority date (Note) -
Expired
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Abstract
This invention relates to a method of improving the dewatering of alumina trihydrate obtained by the Bayer process. The method comprises treating the alumina trihydrate with the product of mixing an alkaline liquor and a C.sub.8 to C.sub.20 fatty acid, fatty acid precursor such as an ester or amide, or a fatty acid blend. The product, a fatty acid salt, is an effective dewatering aid. The alumina trihydrate may be washed with a liquor including said product, or the product may be added to a Bayer liquor slurry prior to filtration of the alumina trihydrate. The invention also contemplates a watering aid consisting of the product of mixing an alkaline liquor with a C.sub.8 to C.sub.20 fatty acid or fatty acid precursor.
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