Extraction of Lanthanides with a Binary Extractant Based on Diglycolic Acid N,N-Dioctylamide and Trioctylamine

Abstract

Extraction of lanthanum chloride and nitrate from neutral chloride and nitrate solutions with a binary extractant (R₃NHA) based on an equimolar mixture of diglycolic acid N,N-dioctylamide and tri-n-octylamine was studied. It was shown that the extraction of lanthanum chloride with R₃NHA proceeds by the mechanism of binary extraction of salts to give the LaA₃ extractable compound in the organic phase. In the case of lanthanum nitrate extraction, complexes of a different composition are formed in the organic phase, with the ratio of the metal concentration in the organic phase to the initial concentration of the binary extractant being 1 : 1. The extractability of lanthanides in the system with this binary extractant increased with increasing atomic number of the metal.