A process for the production of titanium dioxide using...

C - Chemistry – Metallurgy – 01 – G

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C01G 23/053 (2006.01) C09C 1/24 (2006.01) C09C 1/36 (2006.01)

Patent

CA 2593639

A process is described for the production of titanium dioxide by the treatment with ammonium fluoride of titanium ores containing iron; the process comprises the following steps : (a) the titanium ore containing iron is reacted with an aqueous NH4F and/or NH4HF2 solution; (b) the aqueous dispersion thus obtained is filtered with consequent separation of a solid residue and an aqueous solution containing titanium salts; (c) the aqueous solution thus obtained is subjected to hydrolysis, the hydrolysis comprising a first stage at pH 7.0-8.5 and a second stage at pH 10.0- 13.0; (d) the aqueous dispersion thus obtained is filtered and the solid residue is subjected to pyrohydrolysis, the pyrohydrolysis comprising a first stage at a maximum temperature of 450 ~C and a second stage at a maximum temperature of 1000 ~C.

La présente invention a trait à un procédé pour la production de dioxyde de titane par le traitement de fluorure d'ammonium de minerais de titane contenant du fer; le procédé comprend les étapes suivantes: (a) on fait réagir le minerai de titane avec une solution aqueuse de NH4F et/ou NH4HF2; (b) la dispersion aqueuse ainsi obtenue est filtrée entraînant la séparation d'un résidu solide et d'une solution aqueuse contenant des sels de titane; (c) la solution aqueuse ainsi obtenue est soumise à une hydrolyse, l'hydrolyse comprenant un premier étage à un pH compris entre 7,0 et 8,5 et un deuxième étage à un pH compris entre 10,0 et 13,0; (d) la dispersion aqueuse ainsi obtenue est filtrée et le résidu solide est soumis à une pyrohydrolyse, la pyrohydrolyse comprenant un premier étage à une température maximale de 450 °C et un deuxième étage à une température maximale de 1000 °C.

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