Method for producing powdered iron oxide

Details Method for producing powdered iron oxide Method for producing powdered iron oxide

1988-12-16

1991-07-16

Straub, Gary P.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Iron group metal

423140, 423632, 423633, 423DIG1, C01G 4902, C22B 100

Patent

active

050323679

ABSTRACT:
A method for producing a powdered iron oxide comprises the steps of adjusting the pH of a crude iron chloride solution to 2.5-4.5; reducing the P content of the solution by mechanical stirring or air bubbling and filtering; and oxidizing the solution into a powdered iron oxide having a maximum P content of 0.005 wt. %. The P content of the solution may also be reduced by ultrafilter treatment. The soft ferrite made by using the powdered iron oxide by this process shows excellent magnetic properties.

REFERENCES:
patent: 1773235 (1930-08-01), Mitchell
patent: 2423385 (1947-07-01), Hixon et al.
patent: 3781405 (1973-12-01), Allan et al.
patent: 3903236 (1975-09-01), McCutcheon et al.
patent: 4026773 (1977-05-01), Van Peteghem
Kawasaki Seitetsu Company Catalog Document.

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