微量锆在钚纯化循环中的行为

研究了相接触时间、相比、硝酸浓度对锆萃取性能的影响,并通过台架试验研究了流比、料液酸度、洗涤级数、萃取级数、铀浓度对Pu产品中Zr净化效果的影响。结果表明:流比(2AF∶2AX)、料液(2AF)中HNO3浓度、洗涤级数对Zr的净化具有显著的影响,而铀浓度对Zr的净化效果影响有限。台架温试验证明,选择的优化工艺可以满足Pu的收率和Pu产品中Zr的净化因子大于100的要求。

Behavior of Trace Zirconium in Plutonium Purification Cycle

The influences of the time of phase contact, the phase ratio, the concentration of HNO3 on the extraction of Zr in nitric acid solution and the influences of flow ratio, the concentration of HNO₃ in 2AF, the stage number of the extraction and scrubbing sections and the concentration of uranium in 2AF on counter current extraction process have been studied in this work. The results show that there is a significant impact for the removal of Zr by flow ratio (2AF∶2AX), the concentration of HNO₃ in 2AF, the stage number of the scrubbing section. Though there is a limited impact for the removal of Zr by the concentration of uranium in 2AF. The better extraction technology was verified through bench scale test. The decontamination factor (DF) of Zr is about 163,  much higher than the design value.