Recovery of uranium from enriched solution by a membrane...

Details Recovery of uranium from enriched solution by a membrane... Recovery of uranium from enriched solution by a membrane...

C - Chemistry, Metallurgy

22

B

53/214, 182/15.3

C22B 60/02 (2006.01) B01D 13/00 (1980.01)

Patent

CA 1140865

13 48,226 ABSTRACT OF THE DISCLOSURE This invention describes a method of concentrating uranium by the passage of a solution containing uranium through at least one separation system, containing at least one semipermeable membrane capable of concentrating uranium, to concentrate uranium and pass a substantial portion of the solution, and to provide a uranium concentrate solution stream. In one embodiment, the solution is enriched solu- tion mining lixiviant. Optionally, calcium may be removed from enriched lixiviant by pretreating the lixiviant with substances effective to raise the pH of the lixiviant, to form a filterable precipitate; or calcium may be made more soluble in the lixiviant by pretreating lixiviant with a substance effective to lower the pH of the lixiviant, so that calcium passes through the semipermeable membrane of the separation system.

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