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在先进二循环Purex流程中,甲基肼作为支持还原剂可迅速消除体系中的亚硝酸,将对钚稳定在低价状态起重要作用。相关研究同时证明,甲基肼可还原Tc(Ⅶ),因此,它对锝的价态以及走向也将产生影响。本工作研究硝酸介质中Tc(Ⅶ)与甲基肼(硝酸甲基肼,下同)的反应,实验考察锝初始浓度、酸度、甲基肼浓度和温度对反应的影响。
In the advanced two-cycle Purex process, methyl hydrazine as a supportive reducer quickly removes nitrous acid from the system and will play an important role in stabilizing plutonium at low prices. Related research also shows that methyl hydrazine can reduce Tc (Ⅶ), therefore, it will also affect the valence state and the trend of technetium. In this work, the reaction of Tc (Ⅶ) with methyl hydrazine (methylhydrazine nitrate, the same below) in nitric acid medium was studied. The effects of initial concentration of technetium, acidity, concentration of methyl hydrazine and temperature on the reaction were investigated experimentally.