Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group iiia metal or beryllium
Patent
1986-12-12
1988-03-22
Garvin, Patrick P.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group iiia metal or beryllium
423124, 423624, C01F 302
Patent
active
047327421
ABSTRACT:
A process for the production of pure aluminum trihydroxide having a controlled median diameter of less than 4 microns with a unimodal distribution and a minimum deviation. The process comprises contacting, for a short time, sodium aluminate solution with a small quantity of ground aluminum trihydroxide having a specific BET surface area of at least 8 m.sup.2 /g, separating the sodium aluminate solution from the solid phase comprising ground aluminum trihydroxide and aluminum trihydroxide precipitate containing impurities, then decomposing the purified sodium aluminate solution in the presence of a quantity of pure ground aluminum trihydroxide from a preceding decomposition operation to precipitate a very pure aluminum trihydroxide having the specified median diameter.
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patent: 4574074 (1986-03-01), Cristol et al.
patent: 4582697 (1986-04-01), Cristol et al.
patent: 4617179 (1986-10-01), Veyrier
Aluminum Pechiney
Garvin Patrick P.
Harvey Paige C.
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