Iron oxide based pigment and process for preparing such a...

C - Chemistry – Metallurgy – 09 – C

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6/210, 204/74

C09C 1/22 (2006.01) C09C 1/24 (2006.01) C09C 3/04 (2006.01) C22B 19/20 (2006.01)

Patent

CA 1047706

ABSTRACT OF THE DISCLOSURE An iron oxide based pigment in alpha-Fe2O3 form, which contains the water insoluble part obtained by calcination of basic iron sulfate and/or jarosite based residues, this pigment being prepared by a process comprising calcining at a temperature from 600° to 800°C and during a period from 2 to 240 minutes basic iron sulfate and/or jarosite based residues, so as to decompose in an incomplete manner such basic iron sulfates and/or jarosite and to obtain in the calcined product an iron bonded sulfur content of more than 0.6%, and solubilizing the not decomposed iron sulfates with other soluble sulfated metals, such as zinc sulfate, by lixiviating the calcined product, these water-soluble compounds being then separated by appropriate processes. Various colors of pigments may be obtained using the same raw material by varying the calcination conditions.

242739

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