Process for the preparation of finely divided aluminas or alumin

Details Process for the preparation of finely divided aluminas or alumin Process for the preparation of finely divided aluminas or alumin

1984-06-21

1985-07-30

Carter, H. T.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423630, 423625, 423631, C01F 716, C01F 730, C01F 732

Patent

active

045321213

ABSTRACT:
Processes for the preparation of pure alumina powders or pure non-stoichiometric alumina-magnesia spinel powders starting with ammonium alum-based compositions which are dehydrated, the dehydration being carried out on dehydrated salts having a bulk density less than 0.2 kg/dm.sup.3 and wherein the dehydration is followed by a calcination with a heating schedule containing at least one intermediate stage at 750.degree. to 850.degree. C., the process of the invention permitting the reproducible production of such aluminas or spinels having specific surfaces of from 100 to 200 m.sup.2 /g and characterized by a very high homogeneity which guarantees a rigorously unimodal pore structure, such aluminas and spinels being useful in preparing isotopic enrichment barriers for gaseous diffusion, as well as metal polishes, catalysts, and catalyst supports.

REFERENCES:
patent: 1957767 (1934-05-01), Fleischer
patent: 1957768 (1934-05-01), Fleischer
patent: 2773741 (1956-12-01), Antonsen
patent: 3325247 (1967-06-01), Magee et al.
patent: 3679361 (1972-07-01), Bonelli
patent: 3898322 (1975-08-01), Leach
patent: 4085201 (1978-04-01), Griffiths
patent: 4377566 (1983-03-01), Bacheland et al.

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