液-液萃取从Th中分离Ac

用234Th、228Ac和139Ce 3做示踪剂,二(2-乙基己基)磷酸做萃取剂,研究了初始HNO3浓度对234Th、228Ac和139Ce 3萃取效率的影响。发现在广泛的酸度范围内,234Th均能被定量地萃取;当HNO3浓度大于2.0mol/L时,228Ac和139Ce3 的萃取效率下降到2%以下。研究了震荡时间对234Th萃取效率的影响,数据显示,1min便可达到萃取平衡。从含大量钍的溶液中分离痕量Ac的实验结果显示,用二(2-乙基己基)磷酸-苯的萃取流程,可使Ac与大量的钍分离,同时Ac的损失又较小。

Separation of Actinium from Thorium by the Liquid-liquid Extraction

Using 234Th, 228Ac and 139Ce 3 for tracer and HDEHP as an extractant, an effect of concentration of HNO3 solution on the extraction efficiency of 234Th, 228Ac and 39Ce 3 has been studied. It has been found that 234Th can be extracted quantitatively from HNO3 solution by HDEHP within extensive concentration of HNO3 solution. When the HNO3 concentration is higher than 2.0 mol/L, the extraction efficiency of 228Ac and 39Ce 3 is lower than 2.0%. The relation between shaking time and the extraction efficiency of 234Th was investigated. Experimental data shows that the extraction equilibrium can arrive within 1 min. The experimental result that the traces of actinium were separated from large amount of thorium, indicates that the separation of actinium from thorium is possible and loss of actinium is little.