Plutonium purification cycle process using formaldoxime as back extraction reagent

Abstract

Belonging to the field of nuclear fuel reprocessing, the invention provides a plutonium purification cycle process using formaldoxime as a back extraction reagent to solve the problems of low plutonium concentration level, poor safety and the like in existing Purex process plutonium purification cycle adopting a salt-free reduction reagent. The process includes: a 2BX's formaldoxime concentration of 0.5-0.7mol / L, a 2BF's nitric acid concentration of 0.15-0.3mol / L, a 2BX's nitric acid concentration of 0.1-0.5mol / L, a flow ratio 2BF:2BX of 3-5:1, a back extraction level of more than 10, and a supplement extraction level of 3-5. The plutonium purification cycle process provided by the invention can realize plutonium concentration by more than 5 times during back extraction, the obtained plutonium product liquid has a plutonium concentration up to 60g / L, a high plutonium yield and good uranium removal effect can be achieved. Within a technological condition range, the process has good operation stability, and has good economical efficiency.

Description

technical field [0001] The invention belongs to the field of nuclear fuel reprocessing, in particular to a plutonium purification cycle process using formaldehyde oxime as a stripping reagent. Background technique [0002] The Purex process is currently the main process used in reprocessing plants, which includes a co-decontamination cycle, a uranium purification cycle and a plutonium purification cycle. Among them, the purpose of the plutonium purification cycle is to purify and concentrate the crude plutonium products obtained from the co-decontamination cycle through extraction and stripping processes, and finally obtain qualified plutonium products. figure 1 . [0003] In order to ensure the plutonium yield of the entire reprocessing process, it is generally required that the plutonium yield of the plutonium purification cycle must reach 99.9%. Since the plutonium purification cycle has the characteristics of high concentration of plutonium in the organic phase (above ...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems of low plutonium concentration level and poor security in the existing Purex process plutonium purification cycle using salt-free reducing reagents, taking into account the plutonium concentration effect and process safety, the invention provides a stripping reagent using formaldehyde oxime plutonium purification recycling process

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