Manufacture of .gamma.-Fe.sub.2 O.sub.3

Details Manufacture of .gamma.-Fe.sub.2 O.sub.3 Manufacture of .gamma.-Fe.sub.2 O.sub.3

1976-05-03

1977-10-18

Vertiz, O. R.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

C01G 4902

Patent

active

040546438

ABSTRACT:
A process for the preparation of essentially pure ferromagnetic .gamma.-Fe.sub.2 O.sub.3 by bringing a solution of a water soluble iron salt to a pH between about 8.0 and 11.0 to obtain a suspension of iron hydroxide, passing air through the iron hydroxide suspension at a temperature of from about 25.degree. to about 80.degree. C., and separating said pure .gamma.-Fe.sub.2 O.sub.3.

REFERENCES:
patent: 2560970 (1951-07-01), Martin
patent: 2560971 (1951-07-01), Martin
patent: 3082067 (1963-03-01), Hund
patent: 3743707 (1973-07-01), Iwase et al.
patent: 3912646 (1975-10-01), Leitner et al.
Mayne, "The Oxidation of Ferrous Hydroxide," J. of the Chemical Society, 1953, pp. 129-132.
Arden, "The Solubility Products of Ferrous and Ferrosic Hydroxides," J. of the Chemical Society, (1950), pp. 882-885.
Chemical Abstracts, vol. 53, pp. 15843-15844.

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