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

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

040617262

ABSTRACT:
Goethite is obtained by reacting an aqueous solution of an iron (II) salt with an aqueous solution of an alkali metal hydroxide and oxidizing the resulting iron(II) hydroxide. The oxidation is carried out in three stages. In the first stage, from 4 to 15% by weight are oxidized in the course of from 0.4 to 5 hours, in the second stage from 60 to 85% by weight are oxidized in the course of from 1.5 to 6 hours and in a third stage the remaining amount of iron is oxidized.

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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