Method for Extracting and Separating Light Rare Earth Element

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PURPOSE : A method for extracting and separating an LREE is provided to reduce the number of extracting steps for recovering a target LREE with a desired purity, and decrease the amount of acid and alkali used.CONSTITUTION : A method for extracting and separating an LREE is such that a target LREE is separated through a solvent extraction from an aqueous solution which contains at least two kinds of LREEs which are selected from a group of La, Ce, Pr and Nd. An organic phase is brought into contact with an acid aqueous solution for back-extracting a target element. The amount of alkali in an alkaline solution used in an extracting step and the amount of acid in the acid aqueous solution used in a back-extracting step are each 1.2 to 3.5 equivalents relative to the LREE in an aqueous phase. An extractant is a compound having formula(I) wherein R1 and R2 each are -CH2CH(C2H5)C4H9, that is, di-2-ethylhexyl diglycol amic acid.COPYRIGHT KIPO 2013