Method for removing organic matter in uranium-containing nitric acid waste liquid by electro-catalytic oxidation

By treating uranium-containing and nitric acid-containing waste liquid generated from uranium purification and conversion through electrocatalytic oxidation and flocculation sedimentation, the problems of reduced evaporation and concentration efficiency and membrane clogging caused by high organic content have been solved, achieving deep treatment and stable operation of the waste liquid.

CN117923708BActive Publication Date: 2026-04-28THE 404 COMPANY LIMITED CHINA NAT NUCLEAR
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Patent Information

Application Number
CN202410094691.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-01-23
Publication Date
2026-04-28
Estimated Expiration
2044-01-23

AI Technical Summary

Technical Problem

In existing technologies, the uranium-containing nitric acid waste liquid generated from uranium purification and conversion has a high organic content, which leads to reduced evaporation and concentration efficiency and the risk of membrane blockage, making it difficult to meet the requirements of subsequent advanced treatment.

Method used

The waste liquid is treated by an electrocatalytic oxidation method, which uses an oil removal tower, an air flotation oil removal machine and a two-stage electrocatalytic oxidation device, combined with a flocculation sedimentation and evaporation concentration system to degrade organic matter to COD≤100mg/L.

Benefits of technology

It effectively removes organic matter from waste liquid, ensuring the stable operation of subsequent deep uranium removal processes, avoiding the risks of reduced evaporation and concentration efficiency and membrane blockage, and is simple to operate with no secondary pollution.

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Abstract

The present application relates to the technical field of uranium purification conversion, and particularly relates to a method for removing organic matters in uranium-containing nitric acid-containing waste liquid by electro-catalytic oxidation, which comprises the following steps: insoluble organic matters in the uranium-containing nitric acid-containing waste liquid are removed by an oil removal tower, and the water phase is used as an original liquid for extraction; suspended matters, oil and gum substances in the raffinate water after extraction are removed by a gas float oil removal machine; the water phase after removal of the suspended matters, oil and gum substances is degraded by an electro-catalytic oxidation device under the action of an applied electric field; the mixed liquid after electro-catalytic oxidation is subjected to flocculation and sedimentation, so that the flocculation in the mixed liquid is polymerized and removed by filtration, and then the filtrate is transported to an evaporation concentration system and a membrane treatment system for deep uranium removal. The present application removes the organic matters in the uranium-containing nitric acid-containing waste liquid by electro-catalytic oxidation, so that the chemical oxygen demand in the waste liquid is reduced to below 100 mg / L, and the feeding requirements of the subsequent uranium deep treatment process and the final discharge requirements are met.
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