Reaction device and method for degrading radioactive waste resin based on fenton method

A technology of radioactive waste resin and reaction device, which is applied in the fields of radioactive purification, chemical/physical/physical-chemical stationary reactors, nuclear engineering, etc., can solve the problems of less research on devices, low degree of automation, and complex equipment and equipment.

Active Publication Date: 2021-04-06
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few studies on the devices for the treatment of solid organic waste by the Fenton method
The existing device for treating radioactive waste ion exchange resin, such as patent 201610895835.7, which introduces ultraviolet light and ozone into the Fenton system to treat the radioactive waste ion exchange resin by wet oxidation reaction, but the equipment is complicated and ozone needs to be added and ultraviolet irradiation equipment, and the degree of automation is not high, which cannot meet the actual industrial production requirements

Method used

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  • Reaction device and method for degrading radioactive waste resin based on fenton method
  • Reaction device and method for degrading radioactive waste resin based on fenton method
  • Reaction device and method for degrading radioactive waste resin based on fenton method

Examples

Experimental program
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Effect test

Embodiment 1

[0050] Use the above-mentioned reaction device to process ZG C NR 50 strongly acidic cation exchange resin, the catalyst is Fe 2+ 、Cu 2 + 、Ce 3+ , Mn 2+ One or several in the solution, using H 2 SO 4 or HNO 3 Acidify the catalyst solution so that the catalyst is not easily oxidized before adding to the main body of the stirring tank, add 0.05~0.05mol / (L·g 干废树脂 ) of the acidifying catalyst solution to the acidifying catalyst feed port. Add 30% volume fraction of H 2 o 2 Solution 5~20ml / g 干废树脂 To the hydrogen peroxide inlet, through the catalyst and H 2 o 2 The hydroxyl radicals (·OH) produced by the Fenton reaction oxidize and decompose the resin particles. The pH value in the reactor is controlled at 0-2, and the temperature is controlled at 60°C-99°C. After reacting for a certain period of time, the weight loss rate of the cation resin is 35% to 95%.

Embodiment 2

[0052] Adopt above-mentioned reaction device to process ZG A NR 170 strongly basic anion exchange resin, catalyst is Fe 2+ 、Cu 2 + 、Ce 3+ , Mn 2+ One or several kinds in the solution, add 0.1~0.3mol / (L·g 干废树脂 ) of H 2 SO 4 or HNO 3 Acidify the catalyst solution so that the catalyst is not easily oxidized before adding to the main body of the stirring tank, add 0.005~0.05mol / (L·g 干废树脂 ) to the acidifying catalyst feed port. Add 30% volume fraction of H 2 o 2 Solution 20~40ml / g 干树脂 To the hydrogen peroxide inlet, through the catalyst and H 2 o 2 Hydroxyl radicals (·OH) generated by the Fenton reaction oxidize and decompose the resin particles. The pH value in the reactor is controlled at 0-1, and the temperature is controlled at 80°C-99°C. After reacting for a certain period of time, the weight loss rate of the anion resin is 20% to 60%.

Embodiment 3

[0054]The mixed resin of ZG C NR50 strongly acidic cation exchange resin and ZG A NR170 strongly basic anion exchange resin is processed by the above-mentioned reaction device, and the mass ratio is 1:1. The catalyst is Fe 2+ 、Cu 2+ 、Ce 3+ , Mn 2+ One or several kinds in the solution, add 0.05~0.2mol / (L·g 干废树脂 ) of H 2 SO 4 or HNO 3 Acidify the catalyst solution so that the catalyst is not easily oxidized before adding to the main body of the stirring tank, add 0.005~0.05mol / (L·g 干废树脂 ) of the acidifying catalyst solution to the acidifying catalyst feed port. Add 30% volume fraction of H 2 o 2 Solution 10~30ml / g 干废树脂 To the hydrogen peroxide inlet, through the catalyst and H 2 o 2 The hydroxyl radicals (·OH) produced by the Fenton reaction oxidize and decompose the resin particles. The pH value in the reactor is controlled at 0-1, and the temperature is controlled at 65°C-99°C. After reacting for a certain period of time, the weight loss rate of the mixed resin i...

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Abstract

The invention belongs to the field of nuclear waste treatment, and specifically discloses a reaction device and method for degrading radioactive waste resin based on the Fenton method. The device includes a stirring reaction module, a resin feeding module, an acidifying catalyst regulating module, a heating regulating module, a hydrogen peroxide regulating module, a reaction liquid processing module, and a reaction gas circulation module control equipment, and the control equipment is used for real-time collection of the reaction substances in the main body of the stirring tank. The temperature and pH value are used to regulate the delivery volume of the acidification catalyst regulation module, the heating regulation module and the hydrogen peroxide regulation module in real time. The method includes adding waste resin, acidification catalyst and hydrogen peroxide into the stirring reaction module according to the feeding order, and real-time regulation of the reaction temperature and pH value, and post-processing the product after the waste resin particles are oxidized and decomposed. The invention can effectively degrade the waste resin, reduce the generation of pollutants, and at the same time reduce the risk of radioactive leakage through a highly automated device.

Description

technical field [0001] The invention belongs to the field of nuclear waste treatment, and more specifically relates to a reaction device and method for degrading radioactive waste resin based on the Fenton method. Background technique [0002] During the operation of nuclear power plants, ion exchange resins are mainly used to purify radioactive nuclides in water, which are treated as waste after one-time use, and contain various radioactive nuclides (such as U-235, U-238, Co-58, Co-60, Cs-134, Cs-137, Sr-89, Sr-90, etc.) and toxic metals (such as B, Ca, Fe, Mn, etc.). At present, the cement solidification method is mainly used for the treatment of waste resin, but because the waste resin absorbs water and easily swells and loses water, it is easy to shrink. Dispose of waste resin. [0003] Compared with pyrolysis, incineration, etc., the Fenton method does not produce secondary pollutants such as sulfides and nitrogen oxides in the treatment process. It is a method for de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21F9/30B01J19/18
CPCB01J19/18G21F9/30
Inventor 徐乐瑾任瑞涛孟想
Owner HUAZHONG UNIV OF SCI & TECH
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