Method for continuously precipitating plutonium oxalate

Abstract

The invention relates to a plutonium oxalate continuous precipitation method which comprises the following steps: adding a combined reagent into a plutonium oxalate precipitation reactor and stirring to enable the combined reagent to form a flow field; then continuously adding the plutonium nitrate (IV) feed liquid and the oxalic acid feed liquid into a plutonium oxalate precipitation reactor for continuous precipitation reaction; the reaction conditions of the continuous precipitation reaction are as follows: the ratio of the flow of the plutonium (IV) nitrate feed liquid to the flow of the oxalic acid feed liquid is (1-1.5): 1, the reaction temperature is 40-58 DEG C, and the reaction time is 10-50 minutes. By adopting the method disclosed by the invention for continuous precipitation of the plutonium oxalate, the production quantity of the plutonium oxalate in unit time can be increased, the precipitation quantity of large plutonium oxalate particles can be increased, and the phenomena of wall sticking and caking of the plutonium oxalate precipitation particles on the inner wall of a plutonium oxalate precipitation reactor can be reduced.

Description

technical field [0001] The present disclosure relates to the field of nuclear waste treatment, in particular to a method for continuous precipitation of plutonium oxalate. Background technique [0002] In order to finally convert the plutonium-containing feed solution into PuO 2 Plutonium powder is stored or made into fast reactor nuclear fuel elements, usually using oxalic acid as a precipitant to directly convert plutonium(III) nitrate into plutonium(III) oxalate for precipitation; or oxidize plutonium(III) nitrate into plutonium(IV) nitrate And then converted to plutonium oxalate precipitation. The generated plutonium (III, IV) oxalate precipitate particles and mother liquor are then passed through the next continuous filtration process section and continuous calcination process section, and finally converted into PuO 2 The powder realizes the conversion of plutonium ions in solution to solid plutonium oxide. Compared with the plutonium(III) oxalate precipitation metho...

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Problems solved by technology

[0008] The purpose of this disclosure is to provide a method for continuous precipitation of plutonium oxalate. The purpose is to solve the problem that during the continuous precipitation of plutonium oxalate, the particle size of plutonium oxalate precipitation particles is small, and the production capacity of plutonium oxalate per unit time is not high. It is easy to have problems such as sticking or agglomeration on the reactor wall

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