Studies have shown a much enhanced differentiation between trivalent actinides and trivalent lanthanides when substituted alkyl dithiophosphinic acids are utilized as the active phasetransfer reagents.  We present a study evaluating the use of a synergistic combination ofbis(o-trifluoromethylphenyl)dithiophosphinic acid and trioctylphosphine oxidefor the complete actinide recovery from UREX-like raffinates.  A complete single-step separation of uranium, neptunium, plutonium and americium from aqueous mixtures containing 0.5 M nitric acid and a total fission product content of 5.5 g/L (45 mM) has beendemonstrated.

Complete recovery of actinides from simulated used fuel raffinates using a hard and soft donor ligands

247th National Meeting (2014)

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