Process for preparing acicular iron oxide particles

Details Process for preparing acicular iron oxide particles Process for preparing acicular iron oxide particles

1980-11-06

1983-03-15

Cooper, Jack

Compositions

Magnetic

Iron-oxygen compound containing

252 6257, 252 6259, 252 6262, 252 6263, 423632, 423634, C01G 4906, C01G 4908

Patent

active

043767141

ABSTRACT:
This disclosure relates to a process for preparing acicular magnetic iron oxide particles by (a) adding an aqueous solution of a ferrous salt to an aqueous solution of a stoichiometric excess of alkaline hydroxide while substantially avoiding local excesses of the ferrous salt, to form an aqueous dispersion of ferrous hydroxide particles, (b) oxidizing these particles to form non-magnetic alpha ferric oxide hydrate particles, and (c) converting the non-magnetic particles to magnetic iron oxide particles by dehydration and reduction or dehydration, reduction and oxidation. The ferrous salt solution is subjected to reducing conditions prior to and/or during the addition to the alkaline hydroxide solution to reduce contaminating ferric ions that are normally present to ferrous ions.

REFERENCES:
patent: 2636892 (1953-04-01), Mayer
patent: 3843773 (1974-10-01), Pingaud
patent: 3928709 (1975-12-01), Audran et al.

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