Device and method for preparing tetravalent uranium through electrolysis

Abstract

The invention relates to a method for preparing tetravalent uranium through electrolysis, which comprises the following steps of: feeding a feed liquid containing uranyl nitrate into a pole chamber (5) from a feed liquid inlet (6) through a circulating pump (4), carrying out constant-current electrolysis in the pole chamber (5), then returning the feed liquid to a feed liquid tank (3) from a feed liquid outlet (7), and maintaining circulation of the feed liquid between the feed liquid tank and the pole chamber. According to the device for preparing tetravalent uranium through electrolysis, a single-chamber structure is adopted, the structure is simple, operation and maintenance are very convenient, and stable operation can be achieved under the condition of high current density through the method; the feed liquid is independently stored in the feed liquid tank with a jacket, so that the feed liquid can be at a constant temperature; when the device and the method for preparing tetravalent uranium through electrolysis are used for preparing tetravalent uranium, the defect of dilution of feed liquid is avoided, and the preparation efficiency of tetravalent uranium is remarkably improved; and gas generated by reaction is discharged from the pole chamber, the system resistance is reduced, and the temperature rise of the solution is slowed down.

Description

technical field [0001] The present disclosure relates to the field of nuclear chemical industry, in particular to a device and method for electrolytically preparing tetravalent uranium. Background technique [0002] In the separation stage of uranium and plutonium in the PUREX process, because tetravalent uranium has the advantages of not introducing impurities and not increasing the salt content of waste liquid, all commercial reprocessing plants currently use tetravalent uranium as a reducing agent to reduce the tetravalent uranium in the organic phase. The plutonium is reduced to a trivalent that is not easy to extract, thereby realizing the mutual separation of uranium and plutonium. At present, the preparation methods of tetravalent uranium mainly include electrolytic reduction method, hydrazine reduction method and hydrogen reduction method. Hydrazine reduction method and hydrogen reduction method have the advantage of high yield of tetravalent uranium, but there are ...

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Problems solved by technology

[0010] Therefore, there are still problems such as the dilution of the feed liquid caused by electrolysis with a diaphragm, and the poor heat and mass transfer performance, low current density, and low production efficiency of the common electrolysis device without a diaphragm.

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