Process for the production of black iron oxide pigments

Details Process for the production of black iron oxide pigments Process for the production of black iron oxide pigments

C - Chemistry, Metallurgy

09

C

C09C 1/24 (2006.01) C01G 49/06 (2006.01) C01G 49/08 (2006.01) C04B 14/30 (2006.01)

Patent

CA 2318638

A process for the production of a black iron oxide pigment from Fe2O3 hematite iron oxide which may be an impure oxide produced by the "Ruthner" process or by other means, or which may be a mineral hematite. The process may be used to upgrade poor quality synthetic or natural hematite, or to improve their performance as red pigments, by conversion to black pigment with subsequent oxidation of the magnetite so produced back to hematite. The process uses a low temperature aqueous slurry reaction in which the hematite is contacted with a soluble source of Fe(II) ions in the presence of a soluble source of Fe(III) ions in an aqueous alkaline medium to convert the same to Fe3O4.

L'invention porte sur un procédé de production de pigments d'oxyde noir de fer à partir d'hématite (Fe¿2?O¿3?) qui peut être un oxyde non pur obtenu par le procédé "Ruthner" ou d'autres moyens, ou de l'hématite naturelle. Le procédé peut servir à améliorer la qualité d'hématites naturelles ou de synthèse de médiocre qualité, ou augmentant leurs qualités comme en tant que pigment rouge par conversion en pigment noir et oxydation subséquente de la magnétite ainsi produite redonnant de l'hématite. Le processus se base sur la réaction à basse température d'une bouillie aqueuse où l'hématite est en contact avec une source soluble d'ions de Fe(II), en présence d'une source d'ions de Fe(III), dans un milieu aqueux alcalin afin de la convertir en Fe¿3?O¿4?.

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