Uranium and plutonium separating technology with hydroxyamino acetic acid serving as reverse extracting reagent

Abstract

The invention belongs to the field of nuclear fuel reprocessing and provides a uranium and plutonium separating technology with hydroxyamino acetic acid serving as a reverse extracting reagent to solve the problems in an existing salt-free reducing agent system in the uranium and plutonium separating technology. The technology includes the conditions that the concentration of hydroxyamino acetic acid of 1BX ranges from 0.5 mol / L to 0.8 mol / L, the concentration of uranium of 1BF ranges from 70 g / L to 95 g / L, the concentration of plutonium ranges from 0.1 g / L to 3 g / L, the concentration of nitric acid of 1BS ranges from 0.3 mol / L to 0.6 mol / L, the flow ratio of 1BF to 1BX to 1BS is 4-8:1:0.5, the reverse extracting level number is larger than or equal to 10, and the supplementing extracting level number is larger than or equal to 5. The uranium and plutonium separating technology is good in separating effect and particularly suitable for high-acid systems and achieves deep uranium and plutonium separating; and operation stability is good in the technology condition range, the use amount of the reagent is reduced, the economical efficiency is improved, and minimization of radioactive waste is facilitated.

Description

technical field [0001] The invention belongs to the field of nuclear fuel reprocessing, in particular to a process for separating uranium and plutonium using hydroxylamine acetic acid as a stripping reagent. Background technique [0002] The uranium-plutonium co-decontamination process for spent fuel reprocessing usually includes two key steps: uranium-plutonium co-extraction and uranium-plutonium separation. Wherein, the uranium-plutonium separation step uses a reducing agent to selectively reduce the plutonium and back-extract it into the water phase, thereby realizing the separation of uranium and plutonium. In the actual process of separating uranium and plutonium, the radiolysis of nitric acid in the water phase will produce a certain amount of nitrous acid. Since nitrous acid can quickly oxidize trivalent plutonium to tetravalent, which will affect the smooth progress of stripping, so in addition to the reducing agent , In the process of separating uranium and plutoni...

AI Technical Summary

Problems solved by technology

[0005] The uranium-plutonium separation process using the above-mentioned salt-free reducing agent system still has some problems to varying degrees, specifically: 1) The reducing agent system using the reducing agent + supporting reducing agent has a relatively complicated process and low economic efficiency; 2) ) The U(IV)-hydrazine system will cause reduction failure problems, and the purification coefficient of uranium in plutonium is low; 3) The hydroxylamine + hydrazine system cannot effectively realize the deep separation of uranium and plutonium; 4) The dimethyl hydroxylamine + monomethylhydrazine system It belongs to the double reagent system, and its danger is relatively high, and it is prone to explosion