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一、前言 在核燃料后处理Purex流程中,铀纯化段的回收铀中常含有少量钌,使铀钌分离成为纯化铀的一个重要问题。实验表明,辐照铀经HNO_3溶解后,裂变产物钌主要以亚硝酰钌RuNO~(3+)状态存在。它与溶液中的NO_3~-,NO_2~-,OH~-和H_2O等离子或分子形成配位数为6的多种配合物。各种RuNO~(3+)的硝酸基配合物的比例取决于溶液中NO~-和H~+离子的浓度。而NO_2~-与RuNO~(3+)的配合能力比NO_3~-与RuNO~(3+)的强。在一定条件下,两类配合物之间可以相互转化。铀主要是以UO_2~(2+)的NO_3~-配合物存在。
I. INTRODUCTION In the post-treatment Purex process for nuclear fuel, the recovered uranium in the uranium purification section often contains a small amount of ruthenium, making the separation of uranium and ruthenium an important issue in the purification of uranium. Experiments show that, after the irradiated uranium is dissolved by HNO_3, the ruthenium of the fission product mainly exists in the state of RuNO 3+. It forms a number of complexes with coordination number 6 with NO_3 ~ -, NO_2 ~ -, OH ~ - and H_2O in plasma or molecule. The ratio of nitric acid complexes of various RuNO ~ (3+) depends on the concentrations of NO ~ - and H ~ + ions in the solution. However, the binding ability of NO_2 ~ - with RuNO ~ (3+) is stronger than that of NO_3 ~ - and RuNO ~ (3+). Under certain conditions, two types of complexes can be transformed into each other. Uranium is mainly based on the NO_3 ~ - complex of UO_2 ~ (2+).