Process for the preparation of pigment grade iron oxides...

Details Process for the preparation of pigment grade iron oxides... Process for the preparation of pigment grade iron oxides...

C - Chemistry, Metallurgy

01

G

23/269

C01G 49/06 (2006.01) A23L 1/275 (2006.01) C09C 1/24 (2006.01)

Patent

CA 1115932

Abstract of the Disclosure This invention relates to a novel process for producing pigment grade Fe203 from waste ferrous sulfate by a roasting process. Waste ferrous sulfate is partially converted to the oxide by roasting and after elimination of soluble constituents by washing, the oxide is subjected to pigmentary calcination and then crushed and if desired, micronized. The process produces red pigments of excellent quality which are characterized by pure tints ranging from orange-red to purplish-red with low oil absorption levels. The pigments find a variety of uses and in view of their low toxicity, may effectively be used in foodstuffs. The process provides a useful means to convert previously waste by-products into commercially viable products more effectively than any other prior art process. The products thus produced exhibit excellent qualities for use as pigments.

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