Recovery of titanium from titanium bearing materials

Details Recovery of titanium from titanium bearing materials Recovery of titanium from titanium bearing materials

C - Chemistry, Metallurgy

01

G

C01G 23/053 (2006.01) C01F 7/76 (2006.01) C01F 11/46 (2006.01) C01G 49/14 (2006.01) C22B 34/12 (2006.01)

Patent

CA 2457837

A method of recovering titanium dioxide from a raw material additionally containing aluminium includes the steps of grinding the titanium dioxide raw material, reacting the particulate raw feed material with sulphuric acid under specified conditions, digesting and filtering the resultant cake material containing titanyl sulphate, if present, treating the solution to remove calcium and/or iron, precipitating out the aluminium as aluminium ammonium sulphate, hydrolysing the remaining titanyl sulphate solution and, after washing the hydrolysate, calcining the hydrolysate to produce titanium dioxide.

L'invention concerne un procédé de récupération de dioxyde de titane à partir d'un matériau brut contenant également de l'aluminium. Le procédé selon l'invention consiste : à broyer le matériau brut de dioxyde de titane; à faire réagir le matériau d'alimentation brut particulier avec de l'acide sulfurique dans des conditions déterminées; à digérer et à filtrer le matériau comprimé résultant contenant du sulfate de titane, s'il y en a; à traiter la solution pour éliminer le calcium et/ou le fer; à précipiter l'aluminium sous forme de sulfate d'ammonium et d'aluminium; à hydrolyser la solution de sulfate de titane restante; puis, après lavage de l'hydrolysat, à calciner l'hydrolysat pour produire du dioxyde de titane.

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