Method of preparing spheroidal alumina particles

Details Method of preparing spheroidal alumina particles Method of preparing spheroidal alumina particles

1979-05-17

1981-02-10

Shine, W. J.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252463, 423628, B01J 2104, B01J 3700, B01F 702

Patent

active

042500583

ABSTRACT:
A method of preparing spheroidal alumina particles of improved physical stability is disclosed. Alumina hydrogel particles prepared by the oil-drop method are aged in the forming oil at atmospheric pressure conditions and at a temperature of from about 95.degree. to 105.degree. C. until the hydrogel spheres achieve a pH in excess of 6 to about 7.5. The forming oil is thereafter displaced with an ammonium salt-buffered aqueous ammoniacal solution, and the hydrogel spheres aged therein for a brief period. After further aging in an aqueous ammoniacal solution in accordance with prior art practice, the spheres are water-washed, dried and calcined.

REFERENCES:
patent: 2620314 (1952-12-01), Hoekstra
patent: 3887493 (1975-06-01), Hayes

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