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

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.