氧化镧中放射性的去除——Ⅱ.几种常用有机磷萃取剂对镧和锕的萃取分离研究
THE REMOVAL OF RADIOACTIVITY FROM LANTHANUM OXIDE II.A STUDY ON THE EXTRACTION SEPARATION OF LANTHANUM AND ACTINIUM BY SOME CONVENTIONAL ORGANOPHOSPHOROUS EXTRACTANTS
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摘要: 本文比较了工业上常用的几种有机磷萃取剂对镧锕的分离能力,选定2-乙基已基膦酸单(2-乙基己基)酯(P_(507))作为氧化镧除放的萃取剂,并对P_(507)萃取分离镧锕的影响因素(如平衡水相pH值,平衡水相中镧浓度及萃取剂浓度等)进行了深入研究。给出了镧锕分配比和分离系数的数学模型,为氧化镧除放射性的工艺流程设计提供了可靠的依据。Abstract: Conventional organophosphorous extractants are compared in the extraction and selectivity of La and Ac. HEHEHP(P507)is selected as extractant for the removal of radioactivity from La2O3. Some factors effecting extraction are studied, such as pH value, lanthanum concentration of the equilibrated aqueous phase and concentraction of the extractant. The mathematical model on the distribution ratio and separation factor of La and Ac is deduced from the experimental results. It provides a dependable basis for the design of the technological process.
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