Process for the production of large boehmite particles
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United States of America Patent
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Feb 19, 1991
Issued Date -
N/A
app pub date -
Aug 30, 1988
filing date -
Apr 4, 1985
priority date (Note) -
Expired
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Abstract
A process for the production of large boehmite crystal aggregates, useful for soft polishing applications is provided herein. A caustic aluminate liquor is contacted with an oxygen-containing gas at elevated temperatures and pressures in the presence of about 1-50 mg/L of copper ions. The liquor is oxidized until a molar ratio of Na.sub.2 O.sub.free to Al.sub.2 O.sub.3 of less than or equal to 1 is achieved, and the oxidized liquor is cooled under quiescent conditions of little or no agitation which causes the crystallization and precipitation or novel large boehmite particles.
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