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

040617254

ABSTRACT:
Acicular gamma-iron(III) oxide is manufactured by reacting an iron(II) salt solution with an aqueous solution of an alkali metal hydroxide and oxidizing the resulting suspension of iron(II) hydroxide in three stages. In a first stage, at most from 0.1 to 4% by weight of the amount of iron(II) hydroxide originally present is oxidized in the course of from 0.1 to 4 hours, in a second stage from 10 to 25% by weight of the said original amount are oxidized in the course of from 1.5 to 6 hours and in a third stage the remaining amount is oxidized. After the oxidation, the goethite formed is reduced to magnetite and the latter 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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