VALUABLE METAL EXTRACTION AGENT AND VALUABLE METAL EXTRACTION METHOD USING SAID EXTRACTION AGENT

摘要

The objective of the present invention is to selectively extract light rare earth metals, and by extension, europium, from an acidic solution containing a plurality of types of rare earth metal. This valuable metal extraction agent is represented by the general formula. In the formula: R1 and R2 each indicate the same or different alkyl group; R3 indicates a hydrogen atom or an alkyl group; and R4 indicates a hydrogen atom or any given group other than an amino group bonded to the α carbon as an amino acid. Preferably, the general formula has a glycine unit, a histidine unit, a lysine unit, an aspartic acid unit, or an N-methylglycine unit. Preferably, when extracting europium using the extraction agent, the pH is adjusted into the range of 2.0-3.0 inclusive, and when selectively extracting light rare earth metals, the pH is adjusted to 1.7-2.7 inclusive.;

主权项

1. An extraction agent for europium or light rare earths, comprising an amide derivative represented by the following general formula (I):(wherein, R1 and R2 each represent the same or different alkyl groups;
the alkyl group is optionally a straight chain or a branched chain; R3 represents a hydrogen atom or an alkyl group; and R4 represents a hydrogen atom or any group other than an amino group, which is bound to the α carbon as an amino acid).