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)-N_(2)H_(4) and Acetohydroxamic Acid

作　　者：宁勇智 张虎[1] 陈锦 李传博[1] NING Yong-zhi;ZHANG Hu;CHEN Jin;LI Chuan-bo(China Institute of Atomic Energy,P.O.Box 275(26),Beijing 102413,China)

机构地区：[1]中国原子能科学研究院放射化学研究所,北京102413

出　　处：《核化学与放射化学》2021年第4期330-337,共8页Journal of Nuclear and Radiochemistry

基　　金：国家自然科学基金资助项目(21790371)。

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(H_(2)MBP)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、HNO_(3)浓度、肼浓度、TBP辐解产物HDBP和H_(2)MBP浓度等条件对含有HDBP或H_(2)MBP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、HNO_(3)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、H_(2)MBP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H_(2)MBP对AHA络合反萃Pu(Ⅳ)的影响。The effects of HDBP and H 2MBP on the stripping of plutonium(Ⅳ)by U(Ⅳ)-N_(2)H_(4) and AHA were studied.Several experiments were carried out to investigate the effects of contact time,phase ratio(o∶a),reductant concentration,HNO_(3) concentration,hydrazine concentration,HDBP and H 2MBP 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 HNO_(3) and hydrazine is conducive to the stripping of Pu(Ⅳ),and U(Ⅳ)can quickly and effectively destroy the complexation of HDBP and H 2MBP with Pu(Ⅳ),then strip Pu(Ⅳ)to the aqueous phase.The influence of HDBP and H 2MBP 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.

关 键 词：U(Ⅳ)-肼 AHA 反萃取 Pu(Ⅳ) HDBP H_(2)MBP 

分 类 号：TL241[核科学技术—核燃料循环与材料]