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Gadolinium zirconate ceramic for curing TRPO simulated waste, and preparation method thereof

A technology of gadolinium zirconate and waste, applied in the field of nuclear energy, can solve the problems of inability to cure TRPO waste, the generation of impurity, and the influence of ceramic radiation resistance, so as to improve radiation resistance, inhibit the accumulation of point defects, The effect of improving the ability to resist radiation damage

Active Publication Date: 2020-04-21
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is currently no research on the use of Gd 2 Zr 2 o 7 Ceramics have been reported to realize the solidification of TRPO waste, which is due to the addition of TRPO waste, which will make Gd 2 Zr 2 o 7 The crystal structure of the ceramic itself changes, which not only produces impurity phases, but also makes Gd 2 Zr 2 o 7 The radiation resistance of ceramics is seriously affected, and then the purpose of solidifying TRPO waste cannot be achieved

Method used

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  • Gadolinium zirconate ceramic for curing TRPO simulated waste, and preparation method thereof
  • Gadolinium zirconate ceramic for curing TRPO simulated waste, and preparation method thereof
  • Gadolinium zirconate ceramic for curing TRPO simulated waste, and preparation method thereof

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Embodiment 1

[0065] This embodiment is used to prepare gadolinium zirconate ceramics for solidifying 10wt% TRPO simulated waste, comprising the following steps:

[0066] (1) Preparation of precursor powder

[0067] It is planned to prepare 25g of precursor powder, Gd in the precursor powder 2 Zr 2 o 7 Occupying the mass percent is 90wt%, and the mass percent accounting for TRPO simulated waste is 10wt%, then Gd 2 Zr 2 o 7 The mass of TRPO is 22.5g, and the mass of TRPO simulated waste is 2.5g. Gd can be calculated 2 Zr 2 o 7 Gd is 11.475g, Zr is 6.658g; TRPO simulated waste is calculated according to Table 2, Y is 0.095g, La is 0.248g, Ce is 0.477g, Pr is 0.2343g, Nd is 0.8123g, Eu is 0.03 g, Gd is 0.0373g, Sm is 0.1475g, Mo is 0.291g, Ru is 0.0567g, and Pd is 0.0743g. Among them, molybdenum, ruthenium and palladium use the corresponding oxides because there is no nitrate. According to the concentration of corresponding elements in the above-mentioned prepared nitrate solution a...

Embodiment 2

[0074] This embodiment is used to prepare gadolinium zirconate ceramics for solidifying 20wt% TRPO simulated waste, comprising the following steps:

[0075] (1) Preparation of precursor powder

[0076] It is planned to prepare 25g of precursor powder, Gd in the precursor powder 2 Zr 2 o 7 Occupying the mass percent is 80wt%, and the mass percent accounting for TRPO simulated waste is 20wt%, then Gd 2 Zr 2 o 7 The mass of TRPO is 20g, and the mass of TRPO simulated waste is 5g. Gd can be calculated 2 Zr 2 o 7 Gd is 10.328g, Zr is 5.992g; TRPO simulated waste is calculated according to Table 2, Y is 0.19g, La is 0.495g, Ce is 0.954g, Pr is 0.4685g, Nd is 1.6245g, Eu is 0.06 g, Gd is 0.0745g, Sm is 0.295g, Mo is 0.582g, Ru is 0.1135g, and Pd is 0.1485g. Among them, molybdenum, ruthenium and palladium use the corresponding oxides because there is no nitrate. According to the concentration of corresponding elements in the above-mentioned prepared nitrate solution and the...

Embodiment 3

[0083] This embodiment is used to prepare gadolinium zirconate ceramics for solidifying 30wt% TRPO simulated waste, comprising the following steps:

[0084] (1) Preparation of precursor powder

[0085] It is planned to prepare 25g of precursor powder, Gd in the precursor powder 2 Zr 2 o 7 Occupying the mass percent is 70wt%, and the mass percent accounting for TRPO simulated waste is 30wt%, then Gd 2 Zr 2 o 7 The mass of TRPO is 17.5g, and the mass of TRPO simulated waste is 7.5g. Gd can be calculated 2 Zr 2 o 7 Gd is 9.037g, Zr is 5.243g; TRPO simulated waste is calculated according to Table 2, Y is 0.285g, La is 0.745g, Ce is 1.431g, Pr is 0.7028g, Nd is 2.4368g, Eu is 0.09 g, Gd is 0.1118g, Sm is 0.4425g, Mo is 0.783g, Ru is 0.1703g, and Pd is 0.2228g. Among them, molybdenum, ruthenium and palladium use the corresponding oxides because there is no nitrate. According to the concentration of corresponding elements in the above-mentioned prepared nitrate solution an...

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Abstract

The invention discloses a gadolinium zirconate ceramic for curing TRPO simulated waste, and a preparation method thereof. The preparation method comprises the following steps: (1) preparing precursorpowder by solid solution of radioactive elements in a liquid manner; (2) preparing a biscuit from the precursor powder obtained in step (1) by adopting dry pressing; and (3) preparing the gadolinium zirconate ceramic for curing the TRPO simulated waste by adopting a microwave sintering method. The prepared gadolinium zirconate ceramic for curing the TRPO waste has the advantages of no block cracking, high compactness and high hardness, and still keeps a single fluorite structure when the solid solution content reaches 60%. The preparation method provides a basic reference scheme for treating high-level radioactive waste liquids, especially curing actinide nuclides with long service life.

Description

technical field [0001] The invention belongs to the technical field of nuclear energy and relates to the solidification of nuclear waste, in particular to gadolinium zirconate ceramics for solidifying TRPO simulated waste and its preparation method and application. Background technique [0002] As a kind of green energy, the development of nuclear power ushered in a new spring, but the safe disposal of radioactive waste in the spent fuel generated by nuclear power is a key issue restricting the sustainable development of nuclear energy. As for the spent fuel generated by nuclear power, it is generally processed through the PUREX (plutonium uranium recovery by extraction) process, and the uranium and plutonium are extracted and turned into high-level liquid waste (High-level liquid waste, HLLW). More than 95% of the spent fuel is concentrated in the waste liquid The radioactive material contains residual uranium and plutonium (0.25%-0.5%), minor actinides (MA) such as Np, Am,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/50C04B35/622C04B35/64G21F9/16B28B3/00
CPCB28B3/00C04B35/48C04B35/50C04B35/62204C04B35/64C04B2235/667G21F9/165
Inventor 卢铁城张宇彤黄章益李秋瑶齐建起
Owner SICHUAN UNIV
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