Production of finely divided acicular magnetic iron oxides

Details Production of finely divided acicular magnetic iron oxides Production of finely divided acicular magnetic iron oxides

1973-01-11

1976-03-30

Vertiz, Oscar R.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

252 6259, 423633, 423634, C01G 4902

Patent

active

039475026

ABSTRACT:
In the production of acicular, ferromagnetic iron oxide of high coercive force by oxidizing an iron (II)-hydroxide suspension with an oxygen-containing gas to form acicular iron (III) oxide hydroxide and dehydrating the iron (III) oxide hydroxide, optionally tempering, reducing and/or reoxidizing this into magnetic iron oxide, the improvement which comprises effecting the oxidation of the iron (II)-hydroxide suspension at a pH of at least about 13, the suspension including SiO.sub.2 in the form of a sol or soluble salt, the resulting iron (III) oxide hydroxide having SiO.sub.2 deposited thereon.

REFERENCES:
patent: 3115470 (1963-12-01), Conley

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