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

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

摘要

摘要: 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。

Abstract: STUDIES OF THE EXTRACTION BEHAVIOR OF Am~(3+) AND LANTHANIDES WITH 7804 EXTRACTANT 1．STUDIES ON EXTRACTION CONDITIONSHOU RUIQIN（Northwest lnstitute of Nuclear Technology，Xi’an，710024）JIAO RONGZHOU ; ZHU YONGJUN（Institute of Nuclear Energy Technology，Tsinghua University，Beijing，100084）ABSTRACT 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 Key words Americium Lanthanides Extraction 2-hydroxy-5-alkyl-acetophenone oxime（7804）

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