2－羟基－5－烷基苯乙肟萃取Am^（3＋）和镧系元素的研究Ⅰ．萃取条件的确定

STUDIES OF THE EXTRACTION BEHAVIOR OF Am￣(3+) AND LANTHANIDES WITH 7804 EXTRACTANT 1.STUDIES ON EXTRACTION CONDITIONS

研究了２－羟基－５－烷基苯乙肟（商品代号７８０４）萃取Ａｍ￣（３＋）和镧系元素时，平衡时间、温度、ｐＨ值、萃取剂浓度及料液中起始Ａｍ￣（３＋）和镧系元素浓度对各元素分配比的影响。研究结果表明，合适的萃取条件为：平衡时间３０ｍｉｎ、温度２０±１°Ｃ、萃取剂浓度０．２ｍｏｌ／ｌ、ｐＨ４．８—５．１。在此条件下，７８０４与Ａｍ￣（３＋）或镧系元素形成２：１配合物。７８０４萃取Ａｍ￣（３＋）及镧系元素的顺序为：Ａｍ＞Ｅｕ＞Ｓｍ＞Ｎｄ＞Ｐｒ＞Ｃｅ＞Ｌａ。

The extraction behavior of Am￣(3+) and lanthanides from nitrate solution using β-oxime extrac-tant, 7804,is studied.Distribution ratios are examined as a function of contact time,concentrationof extractant,pH and extraction temperature. The suitable extraction conditions are as follows :equilibrium time,30min;temperature,20土1℃;extractant concentration,0.2mol/l,pH,4.8 5.1.Under these experimental conditions,7804 forms 2 :1 complex with Am￣(3+) or lanthanides.The extractability sequence is in the order of Am>Eu>Sm>Nd>Pr>Ce>La