Stable aqueous alumina sol and method for preparing the same

Details Stable aqueous alumina sol and method for preparing the same Stable aqueous alumina sol and method for preparing the same

1992-07-21

1995-04-18

Stoll, Robert L.

Compositions

Preservative agents

Anti-corrosion

423115, 4231181, 423124, B01J 1300

Patent

active

054076005

ABSTRACT:
A stable aqueous sol of amorphous alumina containing Al.sub.2 O.sub.3 up to 15% by weight and 0.1 to 0.5 gram equivalent of an anion of acid to 1 mol of aluminum in the sol, in which the colloidal particles of amorphous alumina have a controlled thickness in a range of 20 to 100 millimicrons and a uniform length in a range of 200 to 500 millimicrons is produced by a process comprising feeding an aqueous solution of an acid into an aqueous slurry containing 1 to 7% by weight of metallic aluminum, 10 to 200 ppm by weight as Si0.sub.2 of a water-soluble silicate and 0 to 20 ppm by weight of a water-soluble sulfate as S0.sub.4 to the water in the slurry while maintaining the slurry at a temperature of 80.degree. C. to boiling point under normal pressure, said acid being in an amount of 0.1 to 0.5 gram equivalent to 1 mol of the metallic aluminum in said slurry, at a rate of 0.001 to 0.03 gram equivalent of the acid to 1,000 g of the water in the slurry per minute, and continuing heating the slurry after completion of the feeding of the acid at a temperature of 80.degree. C. to boiling point of the slurry until a sol of amorphous alumina having a uniform length of 200 to 500 millimicrons is formed.

REFERENCES:
patent: 2798049 (1957-07-01), White et al.
patent: 2915475 (1959-12-01), Bugosh
patent: 2992262 (1961-07-01), Sears et al.
patent: 3020242 (1962-02-01), McCarthney et al.
patent: 3031417 (1962-04-01), Bruce
patent: 3031418 (1962-04-01), Bugosh
patent: 3207578 (1965-09-01), Brown et al.

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