SYNERGISTIC AND ANTAGONISTIC BEHAVIOUR IN THE STRIPPING OF HEAVY RARE EARTH ELEMENTS FROM SOLVENT MIXTURES CONTAINING PHOSPHONIC AND PHOSPHiNIC ACIDS AND TRIALKYLPHOSPHINE OXIDES

摘要

The stripping behaviour of ytterbium loaded organic solvent mixtures containing the mono-(2-ethylhexyl) ester of 2-ethylhexylphosphonic acid and bis-(2,4,4-trimethylpentyl)phosphinic acid was examined as a function of trialkylphosphine oxide concentration. Depending on the acid used, either a synergetic or antagonistic effect was observed. Stripping with HC1 of varying concentrations showed a synergic effect as trialkylphosphine oxide concentration increased, while stripping with HNO_3 showed an antagonistic effect.