Method for producing iron oxide pigments from waste acid...

C - Chemistry – Metallurgy – 01 – G

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C01G 49/06 (2006.01) C01G 49/08 (2006.01)

Patent

CA 2324215

The invention relates to a method for producing iron oxide pigments from the waste acid resulting from the production of titanium dioxide according to the sulfate process. The invention is characterized in that in a first step the sulphuric acid contained in the waste acid is partially neutralized with metallic iron compounds and/or iron compounds and possibly neutralized further with another alkaline compound. The precipitate containing Ti, Al, Cr and V compounds is separated from the reaction product obtained in this way. From the resulting iron-sulfate-containing solution an iron oxide yellow pigment or a black iron oxide pigment is precipitated by addition of alkaline compounds and an oxidizing agent. Both pigments can be converted by calcination into an iron oxide red pigment.

Procédé permettant de fabriquer des pigments à base d'oxyde de fer à partir de l'acide dilué provenant de la fabrication d'oxyde de titane selon le procédé au sulfate. Durant une première étape, l'acide sulfurique contenu dans l'acide dilué est partiellement neutralisé par des composés du fer métallique et/ou des composés à base de fer, puis il est éventuellement neutralisé par un autre composé alcalin. Le précipité contenant les composés à base de Ti, Al, Cr et V est séparé du produit de réaction obtenu. Un pigment à base d'oxyde de fer jaune ou à base d'oxyde de fer noir est précipité à partir de la solution obtenue, contenant du sulfate de fer, au moyen de composés alcalins et d'un oxydant. Le pigment peut être converti par calcination en un pigment d'oxyde de fer rouge.

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