Process for the manufacture of coarse aluminium hydroxide
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United States of America Patent
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Oct 2, 2001
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N/A
app pub date -
Oct 20, 1999
filing date -
Oct 28, 1998
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Abstract
A process for the manufacture of coarse aluminum hydroxide via the Bayer Process. The process involves the decomposition of a supersaturated alkaline aluminate liquor in a two stage precipitation process having an agglomeration stage and a growth stage. The agglomeration stage takes place in agglomeration tanks, where the liquor is seeded with fine aluminum hydroxide to induce precipitation and formation of a suspension, followed by a growth stage, where the suspension is seeded with a coarse aluminium hydroxide. Typically, the feed of the supersaturated alkaline aluminate liquor is split over a first agglomeration tank at a higher liquor temperature of 70.degree. to 100.degree. C. and a second agglomeration tank or one or more of a series of second agglomeration tanks at a lower liquor temperature of 50.degree. to 80.degree. C.
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