Abstract
The possibility of using carbohydrazide as a reducing agent for plutonium in Purex process was examined. Kinetics of the reaction between Pu(IV) and carbohydrazide in HNO3 aqueous solution was studied spectrophotometrically, the rate law was established, and the rate constant and activation energy values were calculated. Plutonium stripping efficiency by carbohydrazide as defined is higher in the two-phase system: 30 % TBP with Pu(IV) nitric acid aqueous solution, in the presence of glycine. A laboratory scale counter-current experiment performed with the use of simulated WWER-1000 SNF reprocessing solutions demonstrated the possibility of carbohydrazide–glycine mixture using for plutonium concentrating back-extraction process.
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