Preparation of acicular gamma-iron(III) oxide of high coercive f

Details Preparation of acicular gamma-iron(III) oxide of high coercive f Preparation of acicular gamma-iron(III) oxide of high coercive f

1981-11-10

1982-12-07

Cooper, Jack

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

C01G 4906

Patent

active

043627080

ABSTRACT:
A process for the preparation of acicular gamma-iron(III) oxide of high coercive force by reducing acicular iron(III) oxide hydroxide, as it is being passed continuously through a furnace having two or more heating zones at from 190.degree. to 700.degree. C., by means of a gas mixture which is produced by passing a stream of inert gas, heated to above 250.degree. C., through an organic substance also heated to above 250.degree. C. in a vessel, and, on introduction into the furnace, is first brought into contact with the .alpha.-iron(III) oxide formed from the iron(III) oxide hydroxide by elimination of water in the first heating zone of the furnace at from 190.degree. to 250.degree. C., the .alpha.-iron(III) oxide thereby being converted to magnetite which is subsequently oxidized with an oxygen-containing gas at from 150.degree. to 400.degree. C., to give gamma-iron(III) oxide.

REFERENCES:
patent: 3399142 (1968-08-01), Conley
patent: 3498748 (1970-03-01), Greiner
patent: 4221776 (1980-09-01), Autzen et al.

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