A method for purifying and concentrating plutonium using dioxime imide as reducing and stripping agent

Abstract

The invention belongs to the speciality of nuclear fuel reprocessing, and discloses a plutonium purification and concentration method utilizing dioxime imide as a reduction and reextraction agent. The method comprises the two steps of extraction and reextraction. In the step of extraction, Pu(IV) and U(VI) in a salpeter solution are extracted to enter an organic phase 30%TBP-kerosene solution, so that uranium and plutonium are separated from other components. In the step of reextraction, dioxime imide is utilized as the reduction and reextraction agent, the salpeter solution containing dioxime imide is utilized as a water phase to quickly reduce Pu(IV) in an organic phase into Pu(III) to enter the water phase, and therefore plutonium purification and concentration are achieved, wherein the volume ratio of the organic phase to the water phase is 10:1-1:1. The method has the beneficial effects that the single-stage two-phase contact time is short, the amount of generated radioactive liquid waste is small, and solvent radiolysis damage is small.

Description

technical field [0001] The invention belongs to the specialty of nuclear fuel reprocessing, and in particular relates to a plutonium purification and concentration method using dioxime imide as a reducing and stripping agent. Background technique [0002] The current nuclear fuel reprocessing process uses TBP as the main extraction agent PUREX process, the core of which is to use 30% TBP / kerosene solution as the organic phase to selectively extract hexavalent uranium (U(VI) ) and tetravalent plutonium (Pu(IV)), and then reduce the Pu(IV) in the organic phase to Pu(III) with a reducing stripping agent, and strip it from the organic phase to the water phase to realize the separation of uranium separation. Solvent extraction is usually used for plutonium separation, purification and concentration when the concentration of plutonium is relatively high, and a large amount of α-rays released by plutonium are easily absorbed by the solvent and the extraction agent, so the extracti...

AI Technical Summary

Problems solved by technology

However, the volume ratio of the organic phase to the water phase during the reduction and stripping process of these organic reduction and stripping agents is mostly 1:1, resulting in a heavy burden on the radioactive waste liquid to be treated.

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