Gadolinium zirconate-based nuclear waste solidified body and preparation method thereof

A gadolinium zirconate-based, nuclear waste technology, applied in nuclear engineering, radioactive purification, etc., can solve problems such as low preparation efficiency, and achieve the effects of excellent performance, improved preparation efficiency, and dense microstructure

Inactive Publication Date: 2021-02-12
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the technical problems of the existing low-efficiency preparation of gadolinium zirconate-based nuclear waste solidified body, to provide a preparation method of gadolinium zirconate-based nuclear waste solidified body, using high-voltage, low-current electric field-assisted sintering technology to Improve sintering efficiency and optimize material structure

Method used

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  • Gadolinium zirconate-based nuclear waste solidified body and preparation method thereof
  • Gadolinium zirconate-based nuclear waste solidified body and preparation method thereof
  • Gadolinium zirconate-based nuclear waste solidified body and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] with Gd 2 o 3 Powder and UO 2 The powder is the raw material (the particle size of the powder is 20-40nm), the total mass of the raw material powder is 10g, and the molar ratio is 1:2.

[0035] Put the raw material powder into a ball mill jar, add zirconia ball mill beads and 20 mL of absolute ethanol, and mill at a speed of 150 r / min for 20 h.

[0036] After ball milling and mixing, put the slurry into a constant temperature heating magnetic stirrer, set the temperature at 60°C, heat and stir for 15 minutes, and then put it into a blast drying oven to dry at 90°C for 40h.

[0037] Put the dried mixed powder into a cemented carbide mold coated with a release agent for compression molding, and press it into a green body with a mass of about 1g with an axial pressure of 4MPa; cold isostatic pressing of the green body, cold isostatic The compression pressure is 290MPa, and the pressure holding time is 6min;

[0038] After cold isostatic pressing, the green body was put...

Embodiment 2

[0042] with Gd 2 o 3 Powder and PuO 2 The powder is the raw material (the particle size of the powder is 40-100nm), the total mass of the raw material powder is 10g, and the molar ratio is 1:2.

[0043] Put the raw material powder into a ball mill jar, add zirconia ball mill beads, 20mL of isopropanol and 10ml of acetone, and ball mill at 200r / min for 24h.

[0044] After ball milling and mixing, put the slurry into a constant temperature heating magnetic stirrer, set the temperature at 70°C, heat and stir for 10 minutes, and then put it into a blast drying oven to dry at 90°C for 30h.

[0045] Put the dried mixed powder into a cemented carbide mold coated with a release agent for compression molding, and press it into a green body with a mass of about 1g with an axial pressure of 4MPa; cold isostatic pressing of the green body, cold isostatic The compression pressure is 250MPa, and the pressure holding time is 8min;

[0046] After cold isostatic pressing, the green body wa...

Embodiment 3

[0050] to UO 3 Powder and ZrO 2 The powder is the raw material (the particle size of the powder is 60-100nm), the total mass of the raw material powder is 10g, and the molar ratio is 1:2.

[0051] Put the raw material powder into a ball mill tank, add ball mill beads and 20mL of absolute ethanol, and mix for 20 hours;

[0052] After ball milling and mixing, put the slurry into a constant temperature heating magnetic stirrer, set the temperature at 90°C, heat and stir for 15 minutes, and then put it into a forced air drying oven to dry at 85°C for 30h.

[0053] Put the dried mixed powder into a cemented carbide mold coated with a release agent for compression molding, and press it into a green body with a mass of about 1g with an axial pressure of 4MPa; The static pressure is 300MPa, and the holding time is 5min.

[0054] After cold isostatic pressing, the green body was put into a box furnace and kept at 800°C for 30 minutes, with a heating and cooling rate of 4°C / min.

[...

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Abstract

The invention provides a preparation method of a gadolinium zirconate-based nuclear waste solidified body, and belongs to the technical field of nuclear waste treatment. The preparation method comprises the following steps: mixing: putting a matrix raw material and radioactive nuclear waste into a ball-milling tank, adding zirconium dioxide ball-milling beads and a dispersing agent, and carrying out ball-milling and mixing; drying: heating and stirring the obtained uniformly mixed slurry, and then drying; compression molding: carrying out compression molding on the dried mixed powder, demolding to obtain a biscuit of the rolled zircon pyrochlore, and carrying out isostatic cool pressing on the biscuit; and flash burning: sintering thebiscuit subjected to compression molding, electrifying from room temperature during sintering temperature rise, applying constant electric fields to two ends of the biscuit, and performing flash burning at the moment when the sintering temperature rises tothe flash burning temperature so as to quickly densify thebiscuit. According to the method, an electric field assisted sintering technology, namely flash sintering, is used, so that the furnace temperature during sintering of a solidified body can be remarkably reduced, the sintering time is shortened from 72 hours to 1-10 minutes, the preparation efficiency can be effectively improved, and an ideal material with a compact microstructure and excellent performance can be obtained.

Description

technical field [0001] The invention belongs to the technical field of nuclear waste treatment, in particular to a solidified body of gadolinium zirconate-based nuclear waste and a preparation method thereof. Background technique [0002] While nuclear energy has brought huge economic and social effects to mankind, it has also brought about the problem of nuclear waste disposal. The disposal of high-level radioactive waste has become a global problem. They cause direct or potential harm to human development and the environment. How to manage high-level radioactive waste is related to the sustainable development of the nuclear industry and even the entire human race. [0003] Artificial rock is considered to be the medium material of the second generation of immobilized high-level radioactive waste, and it is also an ideal immobilized substrate for the treatment of actinide nuclides. Therefore, it is generally believed that the artificial rock immobilization method has great ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/622G21F9/30
CPCC04B35/50C04B35/622G21F9/302C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/785
Inventor 徐晨王力潇白彬蔡仕魁
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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