Oxidation of metallic iron to black oxide pigments

Details Oxidation of metallic iron to black oxide pigments Oxidation of metallic iron to black oxide pigments

1977-04-14

1978-10-31

Vertiz, O. R.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Iron group metal

423632, C01G 4902

Patent

active

041235010

ABSTRACT:
A metallic iron-containing starting material such as iron filings, iron powder or a reduced ore such as ilmenite is oxidized with air in the presence of 5 to 40% of iron oxide and/or iron oxide hydroxide nuclei and about 2.5 to 200% of an electrolyte, percentages being based on metallic iron by weight. The oxidation is effected in aqueous suspension at 75.degree. to 100.degree. C and a pH of 4 to 6.5. If the nuclei are magnetite-free, at least the first quarter of the oxidation should be at pH 5 to 6.5. Preferred electrolytes are transition metal salts. The pigments are more intense in color and have a more pronounced blue tinge.

REFERENCES:
patent: 1368748 (1921-02-01), Penniman et al.
patent: 2045807 (1936-06-01), Smyly
patent: 2133267 (1938-10-01), Ayers
patent: 3692683 (1972-09-01), Geus
patent: 3734996 (1973-05-01), Bade et al.
patent: 4024232 (1977-05-01), Garberi et al.

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