Manufacture of .gamma.-iron(III) oxide

Details Manufacture of .gamma.-iron(III) oxide Manufacture of .gamma.-iron(III) oxide

1976-10-15

1977-12-06

Thomas, Earl C.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423633, C01G 4902

Patent

active

040617270

ABSTRACT:
Acicular .gamma.-iron(III) oxide is manufactured by reacting an iron(II) salt solution with aqueous solutions of alkali metal hydroxides and oxidizing the resulting suspension of iron(II) hyroxides in 3 stages. In the first stage not more than 8 percent by weight of the iron(II) hydroxide originally present is oxidized over a period of 0.5 to 4 hours, in the second stage from 25 to 55 percent by weight over a period of 1.5 to 6 hours and the remainder thereof in a third stage. Following this oxidation, the goethite formed is reduced to magnetite, which is then oxidized to acicular .gamma.-iron(III) oxide.

REFERENCES:
patent: 3845198 (1974-10-01), Marcot
patent: 3912646 (1975-10-01), Leitner et al.
patent: 3947502 (1976-03-01), Leitner et al.

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