Method of producing hydrated iron oxide

Details Method of producing hydrated iron oxide Method of producing hydrated iron oxide

1984-09-17

1986-07-01

Cooper, Jack

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423632, C01G 4902

Patent

active

045979588

ABSTRACT:
In a method of producing a hydrated iron oxide as a starting material for a magnetic powder by aging a suspension of a ferric hydroxide prepared by reacting a ferric salt with an aqueous solution of alkali, the aging temperature is controlled between 20.degree. and 100.degree. C. and pH is controlled between 1 and 6 for the first 5 to 240 minutes while nuclei of hydrated iron oxide crystals generate, and then the aqueous solution of alkali is added again to adjust the pH value to 10 to 13.5 to make the crystals grow. This production method is capable of producing an acicular hydrated iron oxide having a reduced particle-size distribution range and also capable of controlling the length of the crystals as desired.

REFERENCES:
patent: 4251504 (1981-02-01), Hamabata et al.

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