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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/physics/physicochemical stationary reactors, nuclear engineering, etc., can solve the problems of less research on devices, complex instruments and equipment, and low degree of automation.

Active Publication Date: 2020-01-24
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 inlet of hydrogen peroxide, 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 ) of the acidifying catalyst solution to the acidifying catalyst feed port. Add 30% volume fraction of H 2 o 2 Solution 20~40ml / g 干树脂 To the inlet of hydrogen peroxide, 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 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 NR 50 strongly acidic cation exchange resin and ZG A NR 170 strongly basic anion exchange resin is treated 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 discloses a reaction device and a method for degrading a radioactive waste resin based on a Fenton method. The device comprises a mixing reaction module, a resin feeding module, an acidic catalyst adjustment module, a heating adjustment module, a hydrogen peroxide adjustment module, a reaction liquid treatment module and gas circulation module control equipment, wherein the control equipment is used for acquiring temperatures and pH values of reaction substances in an agitation tank main body in real time to regulate and controlconveying amounts of the acidic catalyst adjustment module, the heating adjustment module and the hydrogen peroxide adjustment module in real time. The method comprises the following steps: adding awaste resin, an acidic catalyst and hydrogen peroxide into the stirring reaction module according to a feeding order, regulating and controlling reaction temperatures and pH values of the components in real time, performing oxidation decomposition on waste resin particles, and performing aftertreatment on a product of the waste resin particles. By adopting the device and the method, the waste resin can be effectively degraded, pollutants can be reduced, and meanwhile, due to adoption of the highly automatic device, the risk of radioactive leakage can be reduced.

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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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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