Effect of Radiolysis Products of TBP on Complex Stripping of Pu(Ⅳ) by U(Ⅳ)-N₂H₄ and Acetohydroxamic Acid

The effects of HDBP and H₂MBP on the stripping of plutonium(Ⅳ) by U(Ⅳ)-N₂H₄ and AHA were studied. Several experiments were carried out to investigate the effects of contact time, phase ratio(o∶a), reductant concentration, HNO₃ concentration, hydrazine concentration, HDBP and H₂MBP concentrations on the stripping of Pu(Ⅳ). The results show that U(Ⅳ) has a strong ability of stripping Pu(Ⅳ), reducing the phase ratio(o∶a), concentration of HNO₃ and hydrazine is conducive to the stripping of Pu(Ⅳ), and U(Ⅳ) can quickly and effectively destroy the complexation of HDBP and H₂MBP with Pu(Ⅳ), then strip Pu(Ⅳ) to the aqueous phase. The influence of HDBP and H₂MBP on the complexation and stripping of Pu(Ⅳ) can be effectively reduced by reducing the acidity, prolonging the contact time and increasing the concentration of AHA.