硝酸羟胺还原反萃高浓度钚

摘要

The effect factors on reductive stripping of high content plutonium with hydroxyl‐amine nitrate(HAN) from 30% TBP/OK were studied in this paper .The results show that prolonging the contact time ,reducing HNO3 concentration and increasing the temperature all are favorable to reductive stripping of Pu (Ⅳ) .Although increasing the HAN concentration is also in favor of reductive stripping of Pu (Ⅳ) ,it’s not visible for increasing percentage of reductive stripping Pu when the HAN concentration is more than 0.4 mol/L .Increasing the hydrazine concentration is also in favor of reductive stripping of Pu (Ⅳ) ,but the percentage of reductive stripping Pu is reduced with increasing of the hydrazine concentration w hen the hydrazine concentration is more than 0.2 mol/L .The effect of nitrate ion concentration on reductive stripping of Pu (Ⅳ ) is greatly and the percentage of reductive stripping reduces with the increasing of concentration of plutonium . The process of reductive stripping for high content plutonium is affected significantly by the distribution of plutonium between liq‐uid and organic .%对硝酸羟胺（HAN）从30％ TBP／煤油中还原反萃高浓度 Pu（Ⅳ）的影响因素进行了研究。结果表明：延长两相接触时间、降低酸度、升高温度均有利于 Pu（Ⅳ）的还原反萃；增大硝酸羟胺浓度虽然也有利于Pu（Ⅳ）的还原反萃，但是当HAN浓度大于0.4 mol／L后，反萃率增加不明显；增加肼的浓度也有利于Pu（Ⅳ）的还原反萃，但当肼浓度大于0.2 mol／L后，Pu（Ⅳ）的反萃率随肼浓度增加而降低；溶液中硝酸根浓度对 Pu（Ⅳ）反萃率的影响明显；随着钚浓度增加，反萃率降低。钚在水相和有机相的分配对 HAN还原反萃高浓度钚有显著影响。