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    • 1. 发明公开
    • 경 희토류 원소의 추출 및 분리 방법
    • 提取和分离轻稀土元素的方法
    • KR1020130001694A
    • 2013-01-04
    • KR1020120068273
    • 2012-06-26
    • 신에쓰 가가꾸 고교 가부시끼가이샤
    • 스가하라히로토사카키카즈아키미노와타케히사
    • C22B59/00C22B3/26
    • C01F17/0006C22B3/0022C22B59/00Y02P10/234
    • 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.
    • 目的:提供一种提取和分离LREE的方法,以减少用于回收具有所需纯度的目标LREE的提取步骤的数量,并减少所用的酸和碱的量。 构成:用于提取和分离LREE的方法是通过溶剂萃取从含有选自La,Ce,Pr和Nd中的至少两种LREE的水溶液中分离目标LREE。 使有机相与酸性水溶液接触以反萃取目标元素。 在萃取步骤中使用的碱性溶液中的碱的量和用于反萃取步骤的酸性水溶液中的酸的量相对于水相中的LREE为1.2〜3.5当量。 提取剂是具有式(I)的化合物,其中R 1和R 2各自为-CH 2 CH(C 2 H 5)C 4 H 9,即二-2-乙基己基二甘醇酰胺酸。