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Treatment method of radioactive waste negative ion exchange resin

An exchange resin and radioactive waste technology, which is applied in the field of radioactive waste anion exchange resin treatment, can solve the problems of lower oxidant utilization rate, fast oxidant drip rate, large amount of defoamer, etc., and achieve long continuous defoaming time and low price. Inexpensive, the effect of reducing the amount of use

Pending Publication Date: 2018-09-14
CHINA INST FOR RADIATION PROTECTION
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] 1. The amount of defoamer is large;
[0013] 2. The oxidizing agent has a fast dropping rate and a low utilization rate;
[0014] 3. Long response time
This treatment method uses organic acid to adjust the pH value of the system, and the organic acid itself will consume part of the oxidant, reducing the utilization rate of the oxidant; 24 hours of soaking pretreatment is required before the reaction, which prolongs the treatment time

Method used

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  • Treatment method of radioactive waste negative ion exchange resin
  • Treatment method of radioactive waste negative ion exchange resin
  • Treatment method of radioactive waste negative ion exchange resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Embodiment 1: the selection of reaction system pH

[0059] The ionic state of IRN-78 anion resin is OH - , contacting with aqueous solution can exchange OH - , the pH of the system rises. In the experiment, it was found that 10g of wet IRN-78 anion resin was added to 10mL of water, and after standing still for a period of time, the pH of the resin was greater than 11; at the same time, it was found that during the reaction, as the resin quaternary ammonium ion fell off, the pH would also rise. Therefore, it is necessary to adjust the pH value of the reaction system.

[0060] Such as figure 1 As shown, under the conditions of three different pH values, the variation trend of the residual liquid COD (chemical oxygen demand) in the reaction system is studied. It can be seen that: when the pH is controlled to be 1 and 2, the COD value of the reaction system at the same time point similar; comparatively speaking, the COD value of controlling pH to 3 is smaller. Therefor...

Embodiment 2

[0061] Embodiment 2: the selection of reaction system catalyst

[0062] The selection of catalysts includes the selection of catalyst types and the determination of the molar ratio of mixed catalysts (add sulfuric acid to control the pH of the reaction system to be 2). Depend on figure 2 It can be seen that Fe 2+ with Cu 2+ The catalytic effect of the mixed catalyst is higher than that of Fe 2+ or Cu 2+ The catalytic effect of a single catalyst is obviously better.

Embodiment 3

[0063] Embodiment 3: the selection of reaction system defoamer

[0064] Select acetic acid, tributyl phosphate and two kinds of organosilicon oil defoamers, totally four kinds of defoamers are carried out defoaming comparative test (add sulfuric acid to control reaction system pH to be 2; adopt Fe 2+ with Cu 2+ Mixed catalyst, the molar ratio of the two is 2:1), during the test, it was found that acetic acid could not eliminate the bubbles, and tributyl phosphate would quickly repeat the foaming. Therefore, the latter three defoamers were selected to carry out single factor experiments (adding sulfuric acid to control the pH of the reaction system was 2; using Fe 2+ with Cu 2+ Mixed catalyst, the molar ratio of the two is 2:1), the results are shown in Table 1.

[0065] It can be seen from Table 1 that compared with tributyl phosphate, silicone oil defoamer has the obvious advantages of less addition and longer defoaming duration. Among them, Dow Corning-3168 defoamer is c...

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Abstract

The invention belongs to the technical field of nuclear waste treatment, and relates to a treatment method of radioactive waste negative ion exchange resin. The method includes the steps: adding oxidizing agent hydrogen peroxide solution, catalysts and defoaming agents into the radioactive waste negative ion exchange resin; inorganically treating organic components in the radioactive waste negative ion exchange resin by controlling temperature and pH (potential of hydrogen) of reaction. The catalysts are mixture of Fe2+ and Cu2+. By the treatment method of the radioactive waste negative ion exchange resin, oxidative degradation efficiency of the radioactive waste negative ion exchange resin can be improved within a short reaction time, usage amount of the defoaming agents is reduced in thetreating process, and the utilization rate of oxidizing agents is increased in the treatment process.

Description

technical field [0001] The invention belongs to the technical field of nuclear waste treatment, and relates to a treatment method for radioactive waste anion exchange resin. Background technique [0002] Radioactive waste ion exchange resin (hereinafter referred to as "waste resin") is one of the main low- and medium-level solid wastes produced by nuclear facilities, especially nuclear power plants. Waste resin, as a special waste stream containing organic matter, has always been one of the difficulties and hot issues in the safe disposal of radioactive waste due to its adsorption of low and medium levels of radioactive nuclides. Up to now, domestic nuclear power plants mostly use traditional cement solidification technology to process waste resin, and the limited capacity of resin and volume expansion after curing constitute the bottleneck of this treatment technology. [0003] Under the guidance of the concept of "minimization of radioactive waste management", volume redu...

Claims

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Application Information

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IPC IPC(8): G21F9/30G21F9/34
CPCG21F9/30G21F9/34
Inventor 郭喜良贾少青冯文东安鸿翔闫晓俊杨卫兵高超梁栋柳兆峰刘建琴
Owner CHINA INST FOR RADIATION PROTECTION
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