Method for isolating valuable metal

摘要

Provided is a method that selectively extracts and, at a low cost, recovers indium from an acidic solution containing indium and gallium. The present invention is a method that is for isolating a valuable metal and that, by means of subjecting an acidic solution containing indium and gallium to a solvent extraction that is by means of an extraction agent comprising an amide derivative represented by a general formula, extracts indium from the acidic solution. In the formula, R1 and R2 each indicate the same or a 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. The general formula preferably has a glycine unit, a histidine unit, a lysine unit, an aspartic acid unit, or an N-methylglycine unit.

主权项

1. A method for isolating a valuable metal, wherein an acidic solution having an acidic pH and containing indium and gallium is subjected to solvent extraction by an extraction agent comprising an amide derivative represented by the following general formula (I) to isolate indium and gallium from the acidic solution: wherein R1 and R2 each represent the same or different alkyl group, 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 bonded to an α chain as an amino acid.