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研究了Tc()对U()还原反萃Pu()的影响。研究结果表明,在单级反萃中,有机相中锝的初始质量浓度高达441mgL时,Pu()的反萃率无明显改变;两相混合放置时间足够长时,Pu()的反萃率会降低,而且开始降低的时间随锝浓度增加而缩短;体系中有机相和水相的酸浓度、Pu浓度、U()及U()浓度的变化在所研究的范围内对Pu()反萃率的影响都不大。逆流萃取的串级实验结果表明,当1BF中Tc()的质量浓度大于135mgL时,会严重影响Pu()的反萃;小于70mgL时,对Pu()的反萃无明显影响。研究还表明,引起Pu()反萃率降低的原因是肼在低价锝的催化作用下的破坏。降低Tc()含量和缩短放置时间都有助于减小PUREX流程中锝对U()反萃Pu()的影响。
The effect of Tc () on U (subscript (subscript x)) reduction stripping Pu () was studied. The results showed that the stripping efficiency of Pu () did not change significantly when the initial mass concentration of technetium in the organic phase was 441 mgL in single-stage stripping. When the mixing time of two phases was long enough, the stripping rate of Pu () (Ρ), but the time to begin to decrease is shortened with the increase of the concentration of technetium. The change of acid concentration, Pu concentration, U () and U The impact of the extraction rate is not large. The cascade experimental results of countercurrent extraction showed that the stripping of Pu () was seriously affected when the mass concentration of Tc () in 1BF was more than 135 mgL. However, the stripping of Pu () was not affected obviously when the mass concentration of Tc () in 1BF was less than 70 mgL. The study also showed that the reason for the reduction of Pu () stripping rate was the destruction of hydrazine by the catalytic action of low-cost technetium. Reducing the Tc () content and shortening the settling time all contribute to reducing the effect of technetium on U () stripping Pu (P) in the PUREX process.