Manufacture of acicular, ferrimagnetic iron oxide

Details Manufacture of acicular, ferrimagnetic iron oxide Manufacture of acicular, ferrimagnetic iron oxide

1978-08-03

1980-07-22

Cooper, Jack

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

252 6256, C01G 4906

Patent

active

042139597

ABSTRACT:
A process for the manufacture of acicular ferrimagnetic iron oxide by dehydrating acicular iron(III) oxide hydroxides to give acicular iron(III) oxides, then reducing these iron(III) oxides at from 300.degree. to 650.degree. C. by means of an organic compound which decomposes in this temperature range, and oxidizing the reduced product with an oxygen-containing gas at from 200.degree. to 500.degree. C., wherein the acicular iron(III) oxide hydroxides employed consist of a mixture of goethite and lepidocrocite, containing at least 60% of the latter, and the dehydration is carried out at from 250.degree. to 700.degree. C.

REFERENCES:
patent: 2900236 (1959-08-01), Speed et al.
patent: 3117933 (1964-01-01), Abeck et al.

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