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

C - Chemistry, Metallurgy

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C01G 49/02 (2006.01) C01G 49/08 (2006.01)

Patent

CA 1096585

Bayer 2998-LH/jc OXIDATION OF METALLIC IRON TO BLACK OXIDE PIGMENTS Abstract of the Disclosure 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 to 100°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. Le A 17 128

276601

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