Process for producing ferrogmagnetic iron oxide powder comprisin

Details Process for producing ferrogmagnetic iron oxide powder comprisin Process for producing ferrogmagnetic iron oxide powder comprisin

1976-08-02

1978-11-14

Cooper, Jack

Compositions

Magnetic

Iron-oxygen compound containing

252 6256, 427127, C01G 4906, C01G 4908

Patent

active

041254740

ABSTRACT:
In a process for producing a ferromagnetic powder having a high coercive force which comprises adding an aqueous solution containing Co.sup.+2 ions, or both Co.sup.+2 ions and another cation(s), and an alkali solution to a suspension of a ferromagnetic iron oxide containing the metal(s) given by these ion(s), the improvement wherein said ferromagnetic iron oxide is treated with a reducing agent prior to the preparation of the suspension.

REFERENCES:
patent: 3075919 (1963-01-01), Gruber et al.
patent: 3243375 (1966-03-01), Jeschke
patent: 3725126 (1973-04-01), Haller et al.
Umeki, "Chem. Abstracts", vol. 82, 1975, 79751v

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