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Method for Treating Radioactive Mixed Ion Exchange Resin Using Fenton-like Oxidation

A technology of mixed ion exchange and exchange resin, which is used in radioactive purification, nuclear engineering and other directions to reduce residual solid slag, ensure degradation effect, and have strong applicability.

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

The method combines radioactive mixed ion exchange resins with acidified Fe 2+ or Fe 2+ / Cu 2+ The mixed solution was stirred in the reaction vessel at the same time, and H was added dropwise to the reaction vessel. 2 o 2 The solution starts a Fenton-like reaction while continuing to add acidified Fe 2+ or Fe 2 + / Cu 2+ Mixed solution, through Fe 2+ / Cu 2+ with H 2 o 2 The oxidative free radicals (such as OH) produced by the reaction will oxidatively degrade the mixed resin, the operating conditions are mild, and the resin does not require additional treatment before the reaction, the waste resin is completely decomposed without secondary pollution, and the decomposition residue is clear and transparent, and there is almost no Solid residue, economical and feasible, the nuclide contained in the resin is almost completely enriched in the decomposition residue and residue, and the gas phase does not contain any radioactive nuclides, the treatment effect on mixed resin is good, and it has a good application prospect. To a certain extent Solved the problem of secondary pollutant treatment

Method used

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  • Method for Treating Radioactive Mixed Ion Exchange Resin Using Fenton-like Oxidation
  • Method for Treating Radioactive Mixed Ion Exchange Resin Using Fenton-like Oxidation
  • Method for Treating Radioactive Mixed Ion Exchange Resin Using Fenton-like Oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The mixed resin of ZG C NR 50 strongly acidic cation exchange resin and ZG A NR 170 strongly basic anion exchange resin is processed by Fenton-like oxidation method, the total treatment capacity is 20g, and the mass ratio of cation exchange resin and anion exchange resin is 1: 1. The water content is 51.6wt% and 55wt%. In order to investigate the effect of acid addition and no acid addition on the oxidative degradation of mixed ion exchange resins, a group of experiments directly added Fe at a concentration of 0.1mol / L to the reactor. 2+ and Cu at a concentration of 0.1mol / L 2+ solution (i.e. catalyst solution) 50mL, then continue to dropwise add this catalyst solution 50mL and volume fraction be 30% H 2 o 2 Solution 200mL, the initial pH value of reaction solution in this reactor is 1.85; Another group of experiments directly adds the catalyst solution (Fe 2+ and Cu 2+ The concentration is 0.1mol / L, H 2 SO 4 The concentration is 1mol / L), then continue to drip thi...

Embodiment 2

[0055] The mixture of cation exchange resin and anion exchange resin is treated by Fenton-like oxidation method, the total treatment capacity is 20g, the mass ratio of cation exchange resin and anion exchange resin is 1:1, and a total amount of 50mL of sulfuric acid is added to the reactor Catalyst solution after acidification (wherein Fe 2+ and Cu 2+ concentration is 0.2mol / L), and then continue to dropwise add this catalyst solution 50mL and volume fraction be 30% H 2 o 2 The solution is 200mL; mechanical stirring is carried out during the reaction, the reaction temperature is 96±1°C, after 240min of reaction, record the concentration of H 2 SO 4 The catalyst solution of acidification is to the treatment result of mixed ion exchange resin, see table 2:

[0056] Table 2 Example 2 test results

[0057] h 2 SO 4 Concentration (mol / L)

[0058] The results in Table 2 show that after reacting for 240min, the concentration of 0.5-2mol / L H 2 SO 4 Solution, the d...

Embodiment 3

[0060] The mixture of cation exchange resin and anion exchange resin is treated by Fenton-like oxidation method, the total treatment capacity is 20g, the mass ratio of cation exchange resin and anion exchange resin is 1:1, and a total amount of 50mL of sulfuric acid is added to the reactor Acidified catalyst solution (wherein H 2 SO 4 The concentration is 1mol / L), then continue to dropwise add catalyst solution 50mL and volume fraction be 30% H 2 o 2 The solution is 200mL; mechanical stirring is carried out during the reaction, and the reaction temperature is 96±1°C. After reacting for 240 minutes, record the treatment results using different types of catalyst solutions respectively, as shown in Table 3:

[0061] Table 3 Example 3 test results

[0062] Catalyst type pH value COD value (mg / L) Weight loss rate (%) 0.1mol / L Cu 2+

[0063] The results in Table 3 show that for the oxidative decomposition of mixed ion exchange resins, Fe 2+ or Fe 2+ / Cu ...

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Abstract

The invention belongs to the technical field related to radioactive waste treatment, and discloses a method for treating radioactive mixed ion exchange resins by using a Fenton-like oxidation method. The method includes the following steps: combining radioactive mixed ion exchange resins with acidified Fe 2+ solution or Fe 2+ / Cu 2+ The mixed solution is placed in the reaction vessel at the same time, and then H is added to the reaction vessel 2 o 2 solution to initiate a Fenton-like reaction while adding acidified Fe 2+ solution or Fe 2+ / Cu 2+ mixed solution, whereby Fe 2+ or / and Cu 2+ with the H 2 o 2 The oxidizing free radicals generated by the solution reaction oxidize and degrade the mixed resin. The method provided by the invention has mild operating conditions, and does not require additional treatment of the resin before the reaction. The waste resin is completely decomposed without secondary pollution. The decomposition residue is clear and transparent, and there is almost no solid residue in the end. It is economically feasible and has good application prospects.

Description

technical field [0001] The invention belongs to the technical field related to radioactive waste treatment, and more specifically relates to a method for treating radioactive mixed ion exchange resins by a Fenton-like oxidation method. Background technique [0002] Nuclear grade ion exchange resins are widely used in nuclear power plant operation, spent fuel treatment, decontamination and decommissioning of nuclear facilities, radioactive waste liquid treatment, isotope preparation, radiochemical research, and nuclear industrial plants and mines. At present, in the treatment system of pressurized water reactor nuclear power plants, ion exchange resins are mainly used for the desalination, purification and fine treatment of primary and secondary circuit coolants and waste liquids, the removal and purification of radioactive elements and the recovery of nuclear waste. In the primary loop chemical and volume control system, the ion exchange resin is mainly loaded in the purific...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21F9/20G21F9/06
CPCG21F9/06G21F9/20
Inventor 徐乐瑾孟想邓鹏刘佩晗喻建鑫李明亮
Owner HUAZHONG UNIV OF SCI & TECH
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