Economical process for alpha alumina production
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United States of America Patent
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Jul 11, 1989
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N/A
app pub date -
Dec 23, 1987
filing date -
Dec 23, 1987
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Expired
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Abstract
A process for making alpha alumina particles wherein a Bayer process caustic aluminate solution is treated with both alumina hydrate seed material and alpha alumina promoter particles to precipitate alumina hydrate particles. The precipitated particles are separated from the solution and then dried and calcined to produced alpha alumina particles. Addition of promoter particles in the precipitation step lowers the calcination temperture necessary to produce alpha alumina and results in smaller sized crystallites in the product.
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