Production of calcined alumina with a crystallite size which can

Details Production of calcined alumina with a crystallite size which can Production of calcined alumina with a crystallite size which can

1997-10-30

1999-06-29

Marcantoni, Paul

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423626, 501127, C01F 702

Patent

active

059165367

ABSTRACT:
The invention concerns a process for the production of alumina for ceramics by calcining alumina trihydrate in the presence of a mineralizer such as a halogenated compound and/or a boron compound, the calcined alumina being constituted by friable agglomerates of elementary particles, or crystallites, of alpha alumina, the average size of which can be fixed as required, with a unimodal narrow distribution of crystallite sizes, characterized in that calcining of the alumina trihydrate is carried out in an industrial kiln in a renewed oxidising atmosphere at a temperature in the range 800.degree. C. to 1300.degree. C. for a period of 0.5 hour to 4 hours in the simultaneous presence of a halogenated compound acting as a mineralizer and a silica based alumina recrystallisation modifier which is uniformly and intimately distributed in the alumina trihydrate charge.

REFERENCES:
patent: 3859427 (1975-01-01), Francis et al.
patent: 3961036 (1976-06-01), Hamner et al.
patent: 4308088 (1981-12-01), Cherdron et al.
patent: 5538709 (1996-07-01), Mohri et al.

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