Manufacture of iron oxides

Details Manufacture of iron oxides Manufacture of iron oxides

1975-04-24

1976-08-10

Vertiz, Oscar R.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

C01G 4902

Patent

active

039742679

ABSTRACT:
Ferrous hydroxide, formed from ferrous sulfate and sodium hydroxide at high alkalinity, is air-oxidized at a high rate to form ferric hydroxide seed crystals. The air rate is then decreased, and the seeds are allowed to grow to the desired acicular hydrated yellow ferric oxide.

REFERENCES:
patent: 1420985 (1922-06-01), Fireman
patent: 2255607 (1941-09-01), Ayers et al.
patent: 2388659 (1945-11-01), Ryan et al.
patent: 2558302 (1951-06-01), Marcot et al.
patent: 2656282 (1953-10-01), Clarke
patent: 2696426 (1954-12-01), Marcot

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