TBP辐解产物对U(Ⅳ)-肼和乙异羟肟酸反萃Pu(Ⅳ)的影响
Effect of Radiolysis Products of TBP on Complex Stripping of Pu(Ⅳ) by U(Ⅳ)-N2H4 and Acetohydroxamic Acid
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摘要: 研究了磷酸三丁酯(TBP)辐解产物磷酸二丁酯(HDBP)和磷酸一丁酯（H2MBP）对U(Ⅳ)-肼以及乙异羟肟酸(AHA)反萃Pu(Ⅳ)的影响，考察了相接触时间、相比(o∶a)、还原剂浓度、HNO3浓度、肼浓度、TBP辐解产物HDBP和H2MBP浓度等条件对含有HDBP或H2MBP的30%(体积分数)TBP/煤油中Pu(Ⅳ)反萃率的影响。结果表明：U(Ⅳ)对Pu(Ⅳ)有很强的还原反萃能力，降低相比、HNO3浓度、肼浓度有利于U(Ⅳ)对Pu(Ⅳ)的反萃，并且U(Ⅳ)可以快速有效地破坏HDBP、H2MBP与Pu(Ⅳ)的络合，将Pu(Ⅳ)反萃到水相。乙异羟肟酸对Pu(Ⅳ)有很强的络合反萃能力，通过降低酸度、延长相接触时间和增大AHA浓度能够有效降低HDBP和H2MBP对AHA络合反萃Pu(Ⅳ)的影响。Abstract: 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.
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