Iodine removal process for iodine-containing dissolving solution

The iodine removal process, which is enhanced by the synergistic effect of gas-liquid mass transfer and chemical reaction, has solved the problem of efficient removal of radioactive iodine isotopes in nuclear fuel reprocessing. It achieves high iodine removal rate and stable operation, and is suitable for engineering applications.

CN122158220APending Publication Date: 2026-06-05CHINA INSTITUTE OF ATOMIC ENERGY
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Patent Information

Application Number
CN202610162305.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-04
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing technologies are insufficient to efficiently remove radioactive iodine isotopes, especially 129I and 131I, generated during nuclear fuel reprocessing, which pose a threat to the environment and human health.

Method used

By employing the principle of synergistic enhancement of gas-liquid mass transfer and chemical reaction, and by controlling key process parameters such as temperature, gas-liquid ratio, and nitrogen oxide concentration, the efficient conversion and removal of iodine is achieved. The reaction is carried out in an iodine removal tower using a nitric acid solution containing iodate and trace amounts of organic iodine, mixed with nitrogen oxides and air.

Benefits of technology

It achieves an iodine removal rate of over 96%, operates stably, is suitable for engineering applications, has strong adaptability, and can operate stably within a wide range of iodine concentrations, ensuring the closed treatment of iodine.

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Abstract

The invention relates to an iodine removal process for an iodine-containing dissolving solution, and belongs to the field of spent fuel post-treatment. The iodine-containing dissolving solution is introduced into an iodine removal tower from the tower bottom; introducing the removal gas into the iodine removal tower from the middle part and the bottom of the iodine removal tower, and carrying out parallel flow contact on the removal gas and the iodine-containing solution through a gas distributor to carry out an iodine removal reaction; wherein the iodine-containing dissolving solution is a salpeter solution containing iodate and trace organic iodine, and the expelling gas comprises nitrogen oxides and air. According to the iodine removal process disclosed by the invention, hot air containing nitrogen oxide is used as removal gas, and bubbling removal is performed on the iodine-containing dissolving solution in the iodine removal tower under optimized reaction conditions. The conversion of iodine from a liquid phase to a gas phase is realized by controlling reaction conditions, the removal rate can reach more than 96%, the operation is stable and reliable, and the method is suitable for treating the iodine-containing radioactive solution in a nuclear fuel reprocessing plant.
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