Abstract
Solvent extraction of rare earth metal cation was carried out by using Versatic Acid 10 and PC-88A in the presence of additive tri-n-octyl amine. When the extraction reaction of the rare earth metal cation occurs by the acidic extractant, proton is released from molecular of the acidic extractant, and the proton is caught by the tri-n-octyl amine in the organic phase. Under the circumstances pH value of the aqueous phase is not fallen, because the proton is caught in the organic phase and is not discharged into the aqueous phase. Therefore the extraction reaction is continued without addition of alkali such as NaOH, NH3 for correction of falling of the pH value in the aqueous phase.The batch simulation test for continuous countercurrent multistage extraction of the cerium group cation was carried out by application of this method, and the possibility of mutual separation and purification of Nd and Sm was verified.
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