铀纯化循环中乙异羟肟酸净化锆的研究  

Decontamination of Zr by Acetohydroxamic Acid in Uranium Purification Cycle

作　　者：卞晓艳[1] 郑卫芳[1] 张宇[1] 晏太红[1] 杨素亮[1] 鲜亮[1] 迪莹[1] 左臣[1] 

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》2008年第4期193-196,共4页Journal of Nuclear and Radiochemistry

摘　　要：为了考察Purex流程铀纯化循环采用乙异羟肟酸(AHA)纯化铀时锆的净化效果,进行了模拟2D槽萃取段和洗涤段条件下锆的单级分配实验以及模拟2D槽工艺的试管串级实验。单级实验结果表明,增大AHA浓度或降低洗涤酸度都有利于降低锆的分配比;对含铀体系,当磷酸二丁酯(HDBP)的浓度低于0.1 mol/L时,基本不影响锆的净化效果。在以0.2 mol/L AHA-0.5 mol/L HNO3为洗涤液,第8级进料、8级萃取、8级洗涤,流比(2DF/2DX/2DS)为1∶0.48∶0.06工艺条件下进行了2次2D槽串级实验,结果表明,铀中锆的净化系数分别为3.2×104,4.3×104。The effect of the concentrations of acetohydroxamic acid（AHA）, HNO3 and HDBP on the distribution coefficient of Zr（Ⅳ） is studied by single-stage experiments. The result of the experiments simulating the scrubbing section of 2D extractor of the uranium purification cycle shows： D（Zr（Ⅳ）） decreases with the increase of AHA concentration or the decrease of HNO3 concentration. In uranium system, HDBP does not effect DF（Zr（Ⅳ）） when c（HDBP）≤0.1 mol/L. The results of the two times of counter current cascade experiments simulating the scrubbing section of 2D extractor show that DF（Zr（Ⅳ）） is 3.2×10^4 , 4.3×10^4 , respectively. Material balance of Zr（Ⅳ） is 100%, 98%, respectively. All the results indicate that the decon- tamination of Zr（Ⅳ） could be improved using AHA under the precondition of ensuring uranium recovering rate in the uranium purification cycle.

关 键 词：乙异羟肟酸(AHA) 锆 净化 

分 类 号：TL244[核科学技术—核燃料循环与材料]