Process for manufacturing crystalline alumina

Details Process for manufacturing crystalline alumina Process for manufacturing crystalline alumina

1983-08-12

1984-12-11

Carter, Herbert T.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423275, C01F 702

Patent

active

044877560

ABSTRACT:
The invention relates to a process for manufacturing crystalline alumina from aluminum hydroxide which after further conventional treatment is advantageously suitable for ceramic and refractory purposes or as a lapping and polishing agent. The process is such that aluminum hydroxide with a Na.sub.2 O content of .ltoreq.0.1 wt. % with respect to Al.sub.2 O.sub.3 is subjected either directly or after prior partial dehydration to a thermal treatment above the temperature for transformation to .alpha.--Al.sub.2 O.sub.3. The aluminum hydroxide has an addition of an ammonium containing mineralizer made to it, simultaneously in the presence of boron and/or fluorine, in particular an addition of NH.sub.4 BF.sub.4. The product is characterized by way of the essentially isometric shape of the single crystals.

REFERENCES:
patent: 2887361 (1959-05-01), Fenerty
patent: 4374119 (1983-02-01), Schepers et al.

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