Recovery of alumina trihydrate during the bayer process using cross-linked polysaccharides
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United States of America Patent
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Oct 30, 2012
Grant Date -
Feb 9, 2012
app pub date -
Aug 9, 2010
filing date -
Aug 9, 2010
priority date (Note) -
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Abstract
The invention provides methods and compositions for improving the production of alumina hydrate. The invention involves adding one or more polysaccharides to liquor or slurry in the fluid circuit of the production process. The one or more polysaccharides can be a cross-linked polysaccharide (such as cross-linked dextran or cross-linked dihydroxypropyl cellulose). The various polysaccharides can impart a number of advantages including at least some of: greater flocculation effectiveness, increasing the maximum effective dosage, faster settling rate. The production process can be a Bayer process.
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