Method and system for continuous evaporation concentration and oxalic acid destruction of plutonium-containing feed liquid

By using the plutonium-containing material solution to continuously evaporate and concentrate and oxalic acid in the plutonium tail process, the oxalic acid damage and evaporate concentration of the material solution is solved in the prior art, and the problems of insufficient concentration of plutonium precipitation mother liquor and low oxalic acid damage in the prior art are achieved, efficient plutonium material solution concentration and oxalic acid damage, reducing equipment fatigue damage and waste liquid volume.

CN119633413APending Publication Date: 2025-03-18CHINA NUCLEAR POWER ENGINEERING CO LTD
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Patent Information

Application Number
CN202411755945.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-02
Publication Date
2025-03-18

AI Technical Summary

Technical Problem

The prior art has problems such as insufficient concentration of plutonium precipitation mother liquor and low oxalic acid damage rate in the plutonium purification cycle process, resulting in large processing volume and increased waste liquid volume, and high equipment fatigue.

Method used

A method of continuous evaporation and concentration of plutonium-containing material liquid and oxalic acid destruction is adopted. By adding manganese solution and nitric acid to the evaporator, oxalic acid destruction is carried out under the action of manganese catalyst, and the continuous evaporation and concentration of the material liquid is achieved. The concentration ratio is large, the oxalic acid destruction rate is high, the working flux is large, and the equipment fatigue damage is small.

Benefits of technology

It achieves efficient plutonium material liquid concentration, significantly reduces the processing volume and waste liquid volume of the plutonium purification cycle process, improves the oxalic acid damage, reduces equipment fatigue damage, and is suitable for continuous operation and meets the needs of the reprocessing plant.

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Abstract

The invention discloses a plutonium-containing feed liquid continuous evaporation concentration and oxalic acid destruction method and system.The method comprises the steps that a manganese solution and nitric acid are added into the plutonium-containing feed liquid for seasoning, and mixed feed liquid is obtained; continuously adding the mixed material liquid into an evaporator, heating and maintaining a preset temperature, so that the mixed material liquid is evaporated and concentrated in the evaporator, and oxalic acid destruction is completed; when the concentration of the feed liquid in the evaporator reaches the required multiple and the damage of oxalic acid meets the requirement, the concentrated feed liquid starts to be continuously discharged to a concentrated liquid receiving tank, continuous feeding and discharging are achieved, the discharging speed is equal to the feeding speed / the concentration multiple, the feeding speed of the mixed feed liquid and the discharging speed of the concentrated liquid are adjusted, and the feeding speed of the mixed feed liquid and the discharging speed of the concentrated liquid are adjusted; and the liquid level is constant at the preset liquid level value. The method has the advantages of large concentration multiple, high oxalic acid damage rate, large working flux, small equipment fatigue damage, stable equipment, continuous operation and simple operation, can meet the operation requirements of a post-treatment plant, greatly reduces the treatment amount of a plutonium purification cycle flow, and reduces the wastewater amount.
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