Method for extracting uranium and thorium from southern ionic rare-earth lixivium
A technology of ionic rare earth and leaching solution, which is applied in the field of extracting uranium and thorium, can solve the problems of extraction and separation of uranium and thorium, and achieve the effect of high extraction rate, simple process and good separation effect
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Embodiment 1
[0010] Southern ionic type rare earth leach solution, in which the concentration of rare earth ions is 1.7mol / L, the concentration of uranium is 10mg / L, and the concentration of thorium is 12mg / L, [H + ] Concentration is 0.000015mol / L. The extraction agent of 15% naphthenic acid-15% octanol-70% kerosene and the southern ionic type rare earth leachate were extracted in a single stage at a volume ratio of 3:1. After extraction, the concentration of uranium in the water phase was determined to be 0.080mg / L , thorium concentration is 0.07mg / L, and the extraction rate of uranium and thorium is calculated to be 99%; then the loaded organic phase is compared with 2mol / L sulfuric acid solution in a volume ratio of 0.15:1 for single-stage back extraction, after back extraction, The organic phase is returned for reuse, and the aqueous phase is a solution enriched in uranium and thorium, which are further recovered.
Embodiment 2
[0012] Southern ionic rare earth leach solution, in which the concentration of rare earth ions is 1.2mol / L, the concentration of uranium is 18mg / L, and the concentration of thorium is 25mg / L, [H + ] The concentration is 0.03mol / L. The extraction agent of 25% naphthenic acid-25% isooctyl alcohol-50% kerosene and the southern ionic type rare earth leach solution were subjected to three-stage countercurrent extraction at a volume ratio of 5:1. After extraction, the concentration of uranium in the water phase was determined to be 0.075 The concentration of mg / L and thorium is 0.06mg / L, and the extraction rate of uranium and thorium is calculated to be 99%; then the loaded organic phase is compared with the hydrochloric acid solution with a concentration of 5mol / L at a volume ratio of 9:1 for 5-stage back extraction , after stripping, the organic phase is returned for reuse, and the aqueous phase is a solution enriched in uranium and thorium, and the uranium and thorium are further...
Embodiment 3
[0014] Southern ionic rare earth-leach solution, in which the concentration of rare earth ions is 0.85 mol / L, the concentration of uranium is 19 mg / L, and the concentration of thorium is 28 mg / L, [H + ] The concentration is 0.9mol / L. , the extractant of 25% naphthenic acid-15% octanol-60% kerosene and the southern ionic rare earth leachate were subjected to 7-stage countercurrent extraction at a volume ratio of 0.6:1. After extraction, the concentration of uranium in the water phase was determined to be 0.050 mg / L, thorium concentration is 0.06mg / L, the calculated uranium and thorium extraction rate reaches 99%; then the loaded organic phase is compared with the nitric acid solution with a concentration of 5mol / L at a volume ratio of 6:1 for 4-stage stripping , after stripping, the organic phase is returned for reuse, and the aqueous phase is a solution enriched in uranium and thorium, and the uranium and thorium are further recovered.
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