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在热铀处理的Purex流程中,放射性钌(~(103+106)Ru)在硝酸溶液中的化学状态极其复杂,了解其萃取行为对提高裂变产物的去污系数十分重要。在提钚的萃取过程中引入了亚硝酸钠,但是在NaNO_2存在下研究放射性钌在TBP-HNO_3体系中的萃取行为尚未报道。本文首先测定了在NaNO_2-HNO_3溶液中30％(V/V)TBP-煤油对HNO_2和HNO_3的萃取平衡,然后测定了硝酸浓度、NaNO_2浓度以及RuNO原始料液经不同方法处理后对钌分配比的影响,并且探讨了在NaNO_2存在下提高Purex萃取流程中放射性钌去污系数的一些可能途径。此外还采用Kenny-Martin技术来研究RuNO各类络合物的萃取行为。
In the uranium-treated Purex process, the chemical state of radioactive ruthenium (~ (103 + 106) Ru) in nitric acid solution is extremely complicated. Understanding its extraction behavior is very important for improving the fouling coefficient of fission products. The introduction of sodium nitrite into plutonium extraction process, but the extraction of radioactive ruthenium in TBP-HNO 3 system has not been reported in the presence of NaNO 2. In this paper, the equilibrium of extraction of HNO_2 and HNO_3 with 30% (V / V) TBP-kerosene in NaNO_2-HNO_3 solution was determined firstly. Then the nitric acid concentration, NaNO_2 concentration and the distribution of ruthenium , And some possible ways to improve the radioactive ruthenium decontamination coefficient in Purex extraction process in the presence of NaNO_2 were discussed. The Kenny-Martin technique was also used to study the extraction behavior of various RuNO complexes.