Leaching of a titaniferous material

Details Leaching of a titaniferous material Leaching of a titaniferous material

C - Chemistry, Metallurgy

22

B

C22B 1/02 (2006.01) C22B 3/04 (2006.01) C22B 3/06 (2006.01) C22B 34/12 (2006.01)

Patent

CA 2187892

An industrially realistic process for upgrading of titaniferous materials is disclosed. The process comprises the following steps: (i) a pretreatment which has the effect of rendering silica amenable to leaching under the particular conditions of a subsequent leach, and (ii) an aqueous leach in the presence of an acid, the conditions of which are chosen such that silica which enters solution is not hydrolysed or precipitated as a silicate. The pretreatment step (i) may comprise alkaline leaching, roasting or smelting. The leaching step (ii) may be conducted at low solids densities.

L'invention se rapporte à un procédé réalisable à l'échelle industrielle, permettant de valoriser des matériaux titanifères. Ce procédé comprend les étapes suivantes: (i) un prétraitement visant à prédisposer la silice à un lessivage ultérieur soumis à des conditions particulières, et (ii) un lessivage aqueux en présence d'un acide, dont les conditions sont choisies de façon que la silice formant une solution ne soit ni hydrolysée, ni précipitée sous forme d'un silicate. L'étape de prétraitement (i) peut comprendre un lessivage alcalin, la calcination ou la fonte. L'étape de lessivage (ii) peut être effectuée avec des matières solides de faible masse volumique.

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