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在Purex流程中,共去污循环的主要任务之一是从铀、钚中除去锆等裂片元素。本工作通过改变温度、水相硝酸浓度、铀饱和度,研究30%TBP对锆的萃取分配系数的影响及其分配规律。对大量铀中微量锆的分析方法进行了初步研究。水相样品用0.05mol/LTTA-二甲苯萃取分离Zr(Ⅳ),在4mol/LHNO3介质条件下萃取率为99.95%;继用8mol/LHNO3溶液反萃两次,Zr回收率可达89.42%。有机相样品先用0.5mol/LHNO3溶液对锆和铀进行反萃,锆的反萃率接近100%,再依水相样品的处理方法进行分析。采用ICP-AES法对与铀分离后的锆进行了分析。
In the Purex process, one of the main tasks of the total decontamination cycle is to remove elemental zirconium and other elements from uranium and plutonium. In this work, the influence of 30% TBP on the extraction partition coefficient of zirconium and its distribution were studied by changing the temperature, the nitric acid concentration in the water phase and the uranium saturation. A large number of uranium zirconium in the analysis of a preliminary study. The aqueous sample was extracted with 0.05mol / L TTA-xylene and the extraction rate was 99.95% under the condition of 4mol / L HNO3 medium. The stripping rate was 89.42% after 8mol / L HNO3 solution stripping twice. Samples of the organic phase were first stripped of zirconium and uranium by 0.5 mol / L HNO3 solution, and the stripping rate of zirconium was close to 100%, followed by analysis of the water phase sample. The zirconium separated from uranium was analyzed by ICP-AES.