Method for curing radioactive elements through hydrothermal-sintering combination

A technology for radioactive elements and radioactive materials, applied in the field of nuclear waste solidification, can solve the problems of poor solidification capacity, limited solidification capacity, low strength of hydrothermal synthesis solidified body, etc., and achieves the effects of convenient operation, simple process method and simple equipment

Pending Publication Date: 2021-06-29
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the strength of the hydrothermally synthesized cured body is low, and the structure of the cured body is poor, especially for Cl - Poor curing ability, so the curing ability of CsCl is limited

Method used

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  • Method for curing radioactive elements through hydrothermal-sintering combination
  • Method for curing radioactive elements through hydrothermal-sintering combination
  • Method for curing radioactive elements through hydrothermal-sintering combination

Examples

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Embodiment 1

[0035] A method for solidifying radioactive elements by hydrothermal-sintering combination, comprising the following steps:

[0036] (1) get solid raw material activation kaolin, cesium chloride and sodium hydroxide, be 2.4NaOH·3.2CsCl·2SiO according to the molar ratio of chemical elements 2 ·Al 2 o 3 After carrying out proportioning and weighing, add deionized after 0.6 water-solid ratio and stir;

[0037] (2) After stirring evenly, pour out the slurry and place it in a mold, and dry it at a temperature of 70-90°C for 24 hours to solidify;

[0038] (3) After drying, place the cured body in the abrasive tool in a reaction kettle, and heat it with water at a temperature of 200° C. for 24 hours;

[0039] (4) After hydroheating, sintering is carried out, the sintering temperature is set at 1200° C., and the sintering time is 2 hours to obtain a sample, which is designated as Embodiment 1.

Embodiment 2

[0041] A method for solidifying radioactive elements by hydrothermal-sintering combination, comprising the following steps:

[0042] (1) get solid raw material activation kaolin, cesium chloride and sodium hydroxide, be 1.6NaOH·4.8CsCl·2.3SiO according to the molar ratio of chemical elements 2 ·Al 2 o 3 After carrying out proportioning and weighing, add deionized after 0.6 water-solid ratio and stir;

[0043] (2) After stirring evenly, pour out the slurry and place it in a mold, and dry it at a temperature of 70-90°C for 24 hours to solidify;

[0044] (3) After drying, place the cured body in the abrasive tool in a reaction kettle, and heat it with water at a temperature of 200° C. for 24 hours;

[0045] (4) After hydroheating, sintering is carried out, the sintering temperature is set at 1200° C., and the sintering time is 2 hours to obtain a sample, which is designated as Embodiment 2.

Embodiment 3

[0047] A method for solidifying radioactive elements by hydrothermal-sintering combination, comprising the following steps:

[0048] (1) Get solid raw materials to activate kaolin, cesium chloride and sodium hydroxide, according to the molar ratio of chemical elements, it is 0.8NaOH·6.4CsCl·2.6SiO 2 ·Al 2 o 3 After carrying out proportioning and weighing, add deionized after 0.6 water-solid ratio and stir;

[0049] (2) After stirring evenly, pour out the slurry and place it in a mold, and dry it at a temperature of 70-90°C for 24 hours to solidify;

[0050] (3) After drying, place the cured body in the abrasive tool in a reaction kettle, and heat it with water at a temperature of 200° C. for 24 hours;

[0051] (4) After hydroheating, sintering is carried out, the sintering temperature is set at 1200° C., and the sintering time is 2 hours to obtain a sample, which is designated as Embodiment 3.

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Abstract

The invention discloses a method for curing radioactive elements through hydrothermal-sintering combination. The method comprises the following steps that S1, activated kaolin, CsCl and alkali are evenly mixed, and the molar ratio of the alkali to the CsCl to Al2O3 to SiO2 in the mixture is (0.01-10):(0.01-10):(1-3):(2-6); S2, water is added into the mixture obtained in the S1 according to the water-solid ratio of 0.1-1.2, stirring forming is conducted, solidification is conducted, and a solidified body is obtained; and S3, hydrothermal curing is conducted on the cured body obtained in the step S2 at 150-300 DEG C, and sintering is conducted at 1200-1500 DEG C after curing for 20-30 hours. On the basis of hydrothermal synthesis, an ion exchange mechanism of NaOH and CsCl can be utilized to promote Cs<+> to form related precursors under the hydrothermal synthesis condition, a pollucite structure is further formed in a sintering mode, meanwhile, the compactness of the structure is enhanced, and therefore good curing performance is generated.

Description

technical field [0001] The invention belongs to the technical field of nuclear waste solidification, and in particular relates to a method for solidifying radioactive elements through hydrothermal-sintering combination. Background technique [0002] In order to achieve sustainable development, human beings urgently need new alternative energy sources. At present, the energy that has reached industrial applications and can replace fossil fuels on a large scale is mainly nuclear energy. Nuclear power development complies well with certain principles of sustainable development, but there are still some important aspects to consider. They are uranium supply, nuclear waste disposal, nuclear fuel safety cycle and nuclear power plant operation safety. in, 137 Cs belongs to medium and high toxicity, with a long half-life of 30.5a, and the radioactivity accounts for a large proportion of the total radioactivity of mixed fission products. Generally, it takes hundreds of years or ev...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G21F9/30C04B35/44C04B35/622
CPCG21F9/302C04B35/44C04B35/62204C04B2235/3217C04B2235/3201C04B2235/3418C04B2235/349
Inventor陈松孙逍文
OwnerSOUTHWEST JIAOTONG UNIV