Global recovery of uranium, yttrium, thorium and rare earths...

C - Chemistry – Metallurgy – 22 – B

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53/211, 53/369

C22B 3/00 (2006.01) C01B 25/222 (2006.01) C22B 59/00 (2006.01) C22B 60/00 (2006.01) C22B 60/02 (2006.01)

Patent

CA 1222376

PRECIS DE LA DIVULGATION: L' invention concerne un procédé de récupération globale de l'uranium, de l'yttrium, du thorium et des terres rares contenus dans un minorai phosphaté au cours de la préparation d'acide phosphorique par voie humide. Selon l'invention, lors de l'attaque acide du minerai, on ajoute dans le milieu d'attaque,de l'aluminium et/ou du fer de telle façon que la quantité d'aluminium et/ou de fer présente dans ce milieu d'attaque varie entre 0,8 et 1,5 % en poids expri- mé en Al2O3 et/ou Fe2O3 par rapport au minerai soumis à l'attaque.

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