Novel process for the preparation of high purity alumina from am

Details Novel process for the preparation of high purity alumina from am Novel process for the preparation of high purity alumina from am

1981-06-29

1983-03-22

Carter, Herbert T.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423625, 423600, C01F 732

Patent

active

043775667

ABSTRACT:
Process for preparing high purity aluminas from ammonium alum, the process comprising separately dehydrating the alum and thereafter thermally decomposing the dehydrate, wherein the thermal decomposition is carried out by forcing a gas through a layer of the dehydrated alum so as to continuously remove the gaseous reaction products formed without removal of solids by the carrier gas, and providing improved productivity of high purity transition aluminas having specific surfaces above 125 m.sup.2 /g and/or bulk densities above 0.2 g/cm.sup.3, the transition aluminas so obtained being characterized by their greater reactivity for the preparation of corundum so that corundum having a bulk density greater than 0.4 g/cm.sup.3 can be economically prepared.

REFERENCES:
patent: 1957767 (1934-05-01), Fleischer
patent: 1957768 (1934-05-01), Fleischer
patent: 2773741 (1956-12-01), Antonsen
patent: 3679361 (1972-07-01), Bonelli et al.
patent: 4085201 (1978-04-01), Griffiths
Tertian et al., "J. de Chimie Physique", vol. 55, No. 5, 1958, pp. 341-353.

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