C - Chemistry – Metallurgy – 01 – G
Patent
C - Chemistry, Metallurgy
01
G
23/268
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
Kohler Klaus
Schultz Karl-Heinz
Woditsch Peter
Aktiengesellschaft Bayer
Fetherstonhaugh & Co.
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