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Pyrochlore-based glass ceramic for solidifying radioactive waste and preparation method of pyrochlore-based glass ceramic

A technology of radioactive waste and glass ceramics, applied in radioactive purification, nuclear engineering and other directions, can solve problems such as slow temperature adjustment, reduce energy consumption, reduce the time for crystal nucleation and growth, and achieve good safety.

Inactive Publication Date: 2022-01-11
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the traditional glass-ceramic solidification methods are sintering and crystallization methods, which require strict control of the nucleation and growth of ceramic phase crystals through slow temperature adjustment, and part of the preparation process is usually accompanied by high pressure and glass precursors. The preparation of the body, the entire preparation process lasts for several hours to tens of hours

Method used

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  • Pyrochlore-based glass ceramic for solidifying radioactive waste and preparation method of pyrochlore-based glass ceramic
  • Pyrochlore-based glass ceramic for solidifying radioactive waste and preparation method of pyrochlore-based glass ceramic
  • Pyrochlore-based glass ceramic for solidifying radioactive waste and preparation method of pyrochlore-based glass ceramic

Examples

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Embodiment 1

[0050] This embodiment provides a pyrochlore-based glass-ceramic for solidifying radioactive waste and a preparation method thereof, the preparation method comprising the following steps:

[0051] (1) Mix lanthanum oxide, yttrium oxide, zirconium oxide, titanium oxide, and aluminum oxide in a molar ratio of 1:1:2:2:1, and add absolute ethanol as a grinding medium to the material, and grind until the absolute ethanol is fully Volatilize, dry the material, repeat the grinding process, and press with a pressure of 10MPa to obtain a block sample;

[0052] (2) Place the block sample obtained in step (1) at the nozzle of the pneumatic suspension containerless heating equipment, use oxygen as the carrier gas to keep the sample in a suspended state, use a carbon dioxide laser to directly heat the sample, and wait until the sample is heated to a molten state and then Keep for 1 min until the materials are evenly mixed, and then cool and solidify at a cooling rate of 500K / s to obtain py...

Embodiment 2

[0055] This embodiment provides a pyrochlore-based glass-ceramic for solidifying radioactive waste and a preparation method thereof. In the preparation method, except that the cooling rate in step (2) is changed to 400K / s, the rest of the conditions are the same as in Example 1. So I won't go into details here.

[0056] The ceramic phase and glass phase of the pyrochlore-based glass ceramics obtained in this example are similar to those in Example 1.

Embodiment 3

[0058] This embodiment provides a pyrochlore-based glass-ceramic for solidifying radioactive waste and its preparation method. In addition to changing the cooling rate in step (2) to 300K / s in the preparation method, and the solidification cooling curve of the glass-ceramic solidified body Spectrum see figure 2 , and the rest of the conditions are the same as in Example 1, so details are not repeated here.

[0059] The ceramic phase and glass phase of the pyrochlore-based glass ceramics obtained in this example are similar to those in Example 1.

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Abstract

The invention provides pyrochlore-based glass ceramic for solidifying radioactive waste and a preparation method of the pyrochlore-based glass ceramic. The pyrochlore-based glass ceramic comprises the following components: actinide nuclide raw materials, zirconium oxide, titanium oxide and aluminum oxide, the molar ratio of the actinide nuclide raw material to the zirconium oxide to the titanium oxide to the aluminum oxide is (3-5): (3-5): (3-5): (1-3); the preparation method comprises the following steps: (1) mixing actinide nuclide raw materials, zirconium oxide, titanium oxide and aluminum oxide, and pressing to obtain a blocky sample; and (2) heating the blocky sample obtained in the step (1) to a molten state, and cooling and solidifying at a cooling rate of 200-500K / s to obtain the pyrochlore-based glass ceramic. According to the preparation method provided by the invention, the curing process is simplified, the operation difficulty is reduced, the curing safety and the curing efficiency are improved, and the energy consumption and the cost are reduced.

Description

[0001] This application claims the priority of the patent application with application number 202110881996.1 (the filing date of the earlier application is August 2, 2021, and the title of the invention is: a pyrochlore-based glass-ceramic for solidifying radioactive waste and its preparation method). technical field [0002] The invention belongs to the technical field of radioactive nuclear waste treatment, and relates to a pyrochlore-based glass-ceramic, in particular to a pyrochlore-based glass-ceramic for solidifying radioactive waste and a preparation method thereof. Background technique [0003] Nuclear power refers to the electricity generated by nuclear fission or nuclear fusion. Compared with traditional thermal power generation, nuclear power has the advantages of less fuel consumption, cleanness, and no pollution. The development of nuclear power is of great significance for ensuring energy supply and safety, protecting the environment, and optimizing the structur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C10/02G21F9/30
CPCC03C10/0063G21F9/30
Inventor 李建强郭永昶
Owner UNIV OF SCI & TECH BEIJING
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