Process for producing SiO.sub.2 coated iron oxide powder for use

Details Process for producing SiO.sub.2 coated iron oxide powder for use Process for producing SiO.sub.2 coated iron oxide powder for use

1980-11-25

1982-01-05

Cooper, Jack

Coating processes

Particles, flakes, or granules coated or encapsulated

Inorganic base

75 05AA, 148105, 252 6259, 423632, 423633, 423274, 423275, 427127, C01G 4902, C01G 4906

Patent

active

043094597

ABSTRACT:
An SiO.sub.2 coated iron oxide powder used for the preparation of an acicular metallic iron powder or an acicular magnetic iron oxide powder, is produced by forming a slurry of hydrated iron oxide as a starting material or a iron oxide powder having pH of 8 to 14; admixing a water soluble silicate at a ratio of 0.1 to 10 mol % as SiO.sub.2 based on Fe; hydrothermally reacting said mixed slurry at 100.degree. to 250.degree. C. for 5 minutes or longer in a closed reactor, and washing, filtering and drying the product.

REFERENCES:
patent: 3947502 (1976-03-01), Leitner et al.
patent: 4043846 (1977-08-01), Amemiya et al.
patent: 4133677 (1979-01-01), Matsui et al.
patent: 4136158 (1979-01-01), Okuda
patent: 4169912 (1979-10-01), Schonafinger et al.

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