Reductive Stripping of High Content Pu(Ⅳ) With Hydroxysemicarbazide

The performance of reduction stripping of high concentration Pu(Ⅳ) from 30%TBP/kerosene was studied using hydroxysemicarbazide(HSC) aqueous solution of nitric acid, and was compared with HAN-HN and DMHAN-MMH respectively, in the plutonium purification cycle in PUREX process. The results show that it is beneficial for the reduction stripping of Pu(Ⅳ) by prolonging the phase contact time, reducing the ratio(o/a), decreasing the acidity and increasing the temperature at a certain concentration of HSC. As a stripping reductant, HSC can effectively strip high concentration of plutonium loading in 30%TBP/kerosen and its stripping effect is better than other reductants. HSC is promising for application in the plutonium purification cycle in advanced PUREX process based on organic reductants.