Process for preparing high purity alpha-alumina

Details Process for preparing high purity alpha-alumina Process for preparing high purity alpha-alumina

1986-02-03

1986-10-07

Carter, H. T.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

2523131, 423627, C01F 702

Patent

active

046158758

ABSTRACT:
High purity alumina with a low sodium content and with a friable, easily ball milled structure is produced in this invention through a modified sol-gel procedure which includes digestion of the contaminant containing aluminum metal with hydrochloric acid in the presence of excess aluminum, removal of the contaminants, seeding the resulting sol with high purity alumina, drying to a solid, and then calcining said seeded sol solids to produce said high purity alpha alumina.

REFERENCES:
patent: 3340205 (1967-09-01), Hayes et al.
patent: 3925256 (1975-12-01), Rolf et al.
patent: 4028216 (1977-06-01), Michalko
patent: 4032472 (1977-06-01), McCallister
patent: 4151267 (1979-04-01), Puskas

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