AMPHIPHILIC ASYMMETRICAL DIGLYCOLAMIDES AND USE THEREOF FOR EXTRACTING RARE EARTH METALS FROM ACIDIC AQUEOUS SOLUTIONS

摘要

The invention relates to novel asymmetric diglycolamides with optimized amphiphilic character, suitable for use as rare earth extractants. These diglycolamides correspond to general formulas (I) and (II) in which: R1 = alkyl group, linear or branched, C2 to C4; R2 = alkyl group, linear or branched, C9 to C14; with the exception, however, of diglycolamide of general formula (I) in which R1 = n-butyl group and R2 = n-dodecyl group and diglycolamide of general formula (II) in which R1 = ethyl group and R2 = n-dodecyl group . The invention also relates to the use of these diglycolamides for extracting rare earths from acidic aqueous solutions. Applications: production of rare earths from concentrates from “urban minerals”, concentrates from natural ores rich in rare earths or from concentrates from natural mineral residues.