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Radioactive waste curing method and application thereof

A technology of radioactive waste and solidification method, which is applied in radioactive purification, nuclear engineering and other directions, can solve the problems of rising disposal costs and increasing the volume of waste packages, and achieve the effects of improved anti-leaching performance, large waste containment rate and strong adaptability

Inactive Publication Date: 2020-01-03
CHINA NUCLEAR POWER ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The waste body produced by thermal compaction treatment of waste resin cannot directly meet the national requirements for near-surface disposal of radioactive waste, and high-integrity containers are required for secondary packaging, resulting in an increase in the volume of the final waste package and disposal costs. Substantial Increase

Method used

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  • Radioactive waste curing method and application thereof
  • Radioactive waste curing method and application thereof
  • Radioactive waste curing method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] like figure 1 Shown, the solidification method of the radioactive waste in the present embodiment comprises the following steps:

[0034] (1) Dehydration or drying of radioactive waste

[0035] If the radioactive waste contains a lot of free water, it needs to be dehydrated or dried before solidification; if the radioactive waste does not contain water, the following step (2) can be directly performed.

[0036] When the radioactive waste contains a lot of free water (such as waste resin, waste filter media, liquid concentrates and sediments transported by flushing and drainage), this method may not be able to solidify, so it is necessary to use draining before solidification. Dry or desiccated method for dehydration. Dehydration or drying can be carried out by means of filtration, negative pressure suction or evaporation according to different radioactive wastes. Specifically, in this embodiment, dehydration or drying is performed by draining or drying waste.

[003...

Embodiment 2

[0049] This embodiment provides a kind of curing that is applicable to the processed radioactive material (such as dried concentrated solution) that contains higher strong oxidizing agent (such as sodium nitrate), and the difference with the curing method in embodiment 1 is:

[0050] (1) Add flame retardant

[0051]In the step (2) of embodiment 1, according to containing higher strong oxidizing agent (such as containing more sodium nitrate concentrate etc.) To slow down the combustion performance of the final epoxy resin waste cured body. The flame retardant type adopts aluminum hydroxide flame retardant. The amount of the flame retardant is 40% of the total mass of the epoxy resin cured material.

[0052] It should be pointed out that the combustion performance of epoxy resin waste cured body is related to the characteristics of radioactive waste. body, it will burn violently and continuously after being ignited with fire. After adding a flame retardant to the epoxy resin...

Embodiment 3

[0056] like figure 2 As shown, the solidification method provided in this embodiment is suitable for processing materials with larger particle size, such as waste filter media such as drained granular activated carbon or zeolite, and the difference from the solidification method in Example 1 is:

[0057] (1) Select epoxy resin curing material

[0058] In the step (2) of embodiment 1, according to the characteristics of radioactive waste, this embodiment selects the E-51 (EP01441 310) epoxy resin monomer with better fluidity, and the curing agent adopts T-31 epoxy curing agent , the mass ratio of the two is 5:1, and a diluent of 10-20% epoxy resin monomer mass is added to improve the fluidity of the epoxy resin cured material.

[0059] (2) Mixing of curing material of epoxy resin and radioactive waste

[0060] In the step (4) of embodiment 1, the mixing of epoxy resin cured material and radioactive waste adopts negative pressure suction mode to carry out (see figure 2 ). ...

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Abstract

The invention discloses a radioactive waste curing method and application thereof. The radioactive waste curing method includes the following steps: (1) mixing an epoxy resin curing material and radioactive waste so as to obtain a mixture; and (2) performing maintenance curing on the mixture so as to obtain an epoxy resin waste cured body. According to the curing method, curing treatment is performed on low-and-medium level radioactive waste through the epoxy resin curing material, the curing method with high adaptability to the to-be-treated waste, a large tolerance rate of waste and excellent cured body performance is provided for treatment of the low-and-medium level radioactive waste, disposal requirements of the radioactive waste in China can be met, and no secondary waste is generated through the curing method.

Description

technical field [0001] The invention belongs to the technical field of radioactive waste treatment, and in particular relates to a solidification method and application of radioactive waste. Background technique [0002] Radioactive waste is produced from nuclear facilities (including nuclear power plants and spent fuel reprocessing plants, etc.). At present, most of the low- and medium-level radioactive waste produced by my country's nuclear facilities are treated with traditional cement solidification. For some special wastes, other processes are also used (such as waste resins are treated by thermal compaction, concentrates are treated by asphalt solidification, etc.). [0003] The cement solidification process is used to treat radioactive waste. Although the solidified body that can be produced can meet the requirements of GB14569.1 "Performance Requirements for Low and Medium Level Radioactive Solidified Body-Cement Solidified Body", the cement solidification process ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/16G21F9/08G21F9/30
CPCG21F9/08G21F9/167G21F9/307
Inventor 孙茂生李建发雷晓东严沧生张瑞战仕全潘俊超肖晨宇许花郁越胡金成岳彦伟刘华平缪烨杨玉茜
Owner CHINA NUCLEAR POWER ENG CO LTD
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