Process for the production of coarse crystalline alumina

Details Process for the production of coarse crystalline alumina Process for the production of coarse crystalline alumina

1981-09-16

1983-02-15

Carter, Herbert T.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423275, C01F 702

Patent

active

043741193

ABSTRACT:
The invention describes a process for the production of coarse crystalline alumina from aluminum hydroxide, which after preparation by known methods is advantageously useful for abrasives, lapping and polishing purposes or for refractory materials. The process is characterized by aluminum hydroxide, either directly or after previous partial dehydration in the range 200.degree.-550.degree. C., being added with a mineralizer of compound type x(BF.sub.4).sub.n, wherein x stands for NH.sub.4 and metallic elements and n is for the formal valence of x, and subsequently is subjected to an elevated temperature treatment between 750.degree. C. and a value higher than the phase change temperature to .alpha.-Al.sub.2 O.sub.3.

REFERENCES:
patent: 2069060 (1937-01-01), Fessler
patent: 2833622 (1958-05-01), Roberts et al.
patent: 2887361 (1959-05-01), Fenerty
patent: 3262754 (1966-07-01), Sindsay et al.
patent: 3384454 (1968-05-01), Barrington
patent: 3950507 (1976-04-01), Boresker et al.
patent: 4045234 (1977-08-01), Ring
patent: 4130402 (1978-12-01), Schepers et al.
patent: 4308088 (1981-12-01), Cherdron et al.

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