Extraction of uranium from wet-process phosphoric acid

C - Chemistry – Metallurgy – 22 – B

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C22B 60/02 (2006.01) C01G 43/00 (2006.01)

Patent

CA 2731170

A process for the extraction of uranium compounds from wet-process phosphoric acid includes lowering the iron concentration of the wet-process phosphoric acid and reducing the valency of any remaining ferric iron in the wet-process phosphoric acid to ferrous iron, and then extracting uranium compounds from the wet- process phosphoric acid. The process can in-clude separating a side stream from a feed stream of wet-process phosphoric acid, wherein the side stream has a greater concentra-tion of the uranium compounds than the feed stream by filtration Extracting uranium compounds from the wet-process phospho-ric acid can be by ion exchange process or by solvent extraction

L'invention concerne un procédé permettant d'extraire des composés d'uranium à partir de l'acide phosphorique par voie humide, qui consiste notamment à abaisser la teneur en fer de l'acide phosphorique par voie humide et à réduire la valence de tout fer ferrique restant dans l'acide phosphorique par voie humide en fer ferreux, puis à extraire les composés d'uranium de l'acide phosphorique par voie humide. Le procédé peut consister notamment à séparer un flux latéral d'un flux d'alimentation de l'acide phosphorique par voie humide, le flux latéral présentant une teneur plus élevée en composés d'uranium que le flux d'alimentation par filtrage. L'extraction de composés d'uranium de l'acide phosphorique par voie humide peut se réaliser par un procédé d'échange ionique ou par extraction par solvant.

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