Purification of Ru in Uranium Purification Cycle of PUREX Process With Hydroxysemicarbazide as Single Reductant

Ruthenium(Ru) is one of the important fission products. In the uranium purification cycle of nuclear fuel reprocessing, the decontamination efficiency of Ru can be improved by changing the chemical species of Ru through pretreatment process. In this work, the effects of reductant concentration, pretreatment acidity, temperature and other factors on the decontamination efficiency of Ru were studied with hydroxysemicarbazide(HSC) as the reductant. The bench test of the uranium purification cycle was carried out. The results show that HSC as a pretreatment reagent has an obvious effect on improving the decontamination factor(DF) of Ru， and the DF of Ru is 1 455 in the bench test of the uranium purification cycle.