Process for recovering uranium using an alkyl pyrophosphoric...

Details Process for recovering uranium using an alkyl pyrophosphoric... Process for recovering uranium using an alkyl pyrophosphoric...

C - Chemistry, Metallurgy

22

B

53/218

C22B 60/02 (2006.01)

Patent

CA 1179148

PROCESS FOR RECOVERING URANIUM USING AN ALKYL PYROPHOSPHORIC ACID AND ALKALINE STRIPPING SOLUTION Abstract A process is described for the recovery of uranium from wet-process phosphoric acid utilizing an alkyl pyrophosphoric acid extractant. The extractant also contains a modifier for retaining the alkyl pvrophosphoric acid ester in solution in an essentially water-immiscible organic diluent during stripping. After extracting the uranium from wet-process acid, the APPA extractant is treated with an oxidizing agent such as hydrogen peroxide and the uranium stripped into an alkaline stripping solution. The alkaline stripping solution is an aqueous solution of an alkali metal or ammonium carbonate or hydroxide. The barren extractant is recycled for contacting with fresh wet-process acid. Any ferric iron present is precipitated in the stripping solution and then separated from the solution. The uranium is recovered, dried and calcined to a U308 product.

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