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A kind of borosilicate glass ceramic solidified base material and its preparation method and application

A technology for solidifying borosilicate glass and ceramics, used in radioactive purification, nuclear engineering, etc., can solve the problems of safety doubts, lack of long-term safety and stability evaluation, low glass solidified body capacity, etc., to reduce the leaching rate, Improve chemical stability and encapsulation capacity, and achieve the effect of minimization

Active Publication Date: 2021-11-19
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Vitrification is currently the best measure for the solidification of high-level radioactive waste in the nuclear industry, but its safety is questioned by the outside world due to its low containment capacity and lack of long-term safety and stability evaluation.

Method used

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  • A kind of borosilicate glass ceramic solidified base material and its preparation method and application
  • A kind of borosilicate glass ceramic solidified base material and its preparation method and application
  • A kind of borosilicate glass ceramic solidified base material and its preparation method and application

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preparation example Construction

[0036] The present invention also proposes a method for preparing a borosilicate glass-ceramic solidified substrate, which specifically includes the following steps:

[0037] (1) SiO 2 , B 2 o 3 、Na 2 O, CaO, TiO 2 , ZrO 2 ,P 2 o 5 、Cr 2 o 3 , Fe 2 o 3 and CaF 2 After fully grinding and mixing evenly, melt to form a liquid melt;

[0038] In the embodiment of the present invention, by mass percentage, SiO 2 50-65%, B 2 o 3 10-15%, Na 2 O 10-15%, CaO 7-10%, TiO 2 10-13%, ZrO 2 4~6%, P 2 o 5 0~2.5%, Cr 2 o 3 0~2.5%, Fe 2 o 3 0~2.5%, CaF 2 0~2.5%.

[0039] Preferably, SiO 2 50.5~60%, B 2 o 3 11~14%, Na 2 O 12~14%, CaO 7~9%, TiO 2 10-12%, ZrO 2 4-5%, Cr 2 o 3 1-2.5%.

[0040] Further preferably, in mass percent, SiO 2 50.5%, B 2 o 3 12%, Na 2 O 14%, CaO 7%, TiO 2 10%, ZrO 2 4%, Cr 2 o 3 2.5%.

[0041] (2) pouring the liquid melt into a preheated mold, cooling and molding, and annealing to obtain a borosilicate glass cerami...

Embodiment 1

[0061] A method for preparing a borosilicate glass-ceramic solidified substrate, specifically comprising the following steps:

[0062] (1) select the raw material of borosilicate glass-ceramic solidified base material, by mass percentage, described raw material comprises the following components: SiO 2 53%, B 2 o 3 12%, Na 2 O 14%, CaO 7%, TiO 2 10%, ZrO 2 4%;

[0063] (2) Put the raw materials into a blender to fully grind and mix them; place them in a furnace and melt them at 1300° C. for 3 hours to completely melt the batching materials into a liquid melt;

[0064] (3) The liquid melt is poured into a preheated mold, cooled and molded, placed in an annealing furnace at 550° C. for 2 hours, and cooled to room temperature with the furnace to obtain a silicate glass ceramic solidified body substrate.

Embodiment 2

[0066] A method for preparing a borosilicate glass-ceramic solidified substrate, specifically comprising the following steps:

[0067] (1) select the raw material of borosilicate glass-ceramic solidified base material, by mass percentage, described raw material comprises the following components: SiO 2 53%, B 2 o 3 12%, Na 2 O 14%, CaO 7%, TiO 2 10%, ZrO 2 4%;

[0068] (2) Put the raw materials into a mixer to grind and mix thoroughly; place them in a furnace and melt them at 1250° C. for 3.5 hours to completely melt the batching materials into a liquid melt;

[0069] (3) The liquid melt is poured into a preheated mold, cooled and molded, placed in an annealing furnace at 530° C. for 2.5 hours, and cooled to room temperature with the furnace to obtain a silicate glass-ceramic solidified substrate.

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Abstract

The invention relates to a solidified substrate of borosilicate glass ceramics and its preparation method and application. The borosilicate glass ceramic solidified substrate, in mass percentage, includes the following components: SiO 2 50-65%, B 2 o 3 10-15%, Na 2 O 10-15%, CaO 7-10%, TiO 2 10-13%, ZrO 2 4~6%, P 2 o 5 0~2.5%, Cr 2 o 3 0~2.5%, Fe 2 o 3 0~2.5%, CaF 2 0-2.5%. The preparation process of the solidified borosilicate glass ceramic base material of the invention is simple, and can be widely used in the solidification treatment of high-level radioactive waste. The present invention adopts multi-component curing base material, by adjusting the composition and content of the curing base material, and adjusting the melting process, multiple radionuclides can be solidified at the same time; the radionuclides are imprisoned in the crystal structure, which can effectively cure high The actinide elements in the waste greatly improve the chemical stability and containment capacity of the nuclear waste in the solidified body.

Description

technical field [0001] The invention belongs to the treatment and disposal of radioactive waste, and in particular relates to a borosilicate glass ceramic solidified base material and its preparation method and application, especially to a glass ceramic solidified material for the treatment of high radioactive nuclear waste produced by Chinese power reactors . Background technique [0002] High-level radioactive waste mainly refers to the high-level radioactive waste liquid and its solidified body produced by the reprocessing of spent fuel, spent fuel to be disposed of directly (one-pass type), and other wastes with corresponding radioactive levels. Although the volume of high-level radioactive waste is less than 1% of the volume of radioactive waste produced by the nuclear fuel cycle, the amount of radioactivity contained in it exceeds 99% of the total radioactive amount of the nuclear fuel cycle. High-level radioactive waste contains neptunium, plutonium, americium, techn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C10/04C03C3/115C03C3/089G21F9/30
CPCC03C3/089C03C3/115C03C10/0009G21F9/302
Inventor 朱永昌韩勖崔竹刘峻
Owner CHINA BUILDING MATERIALS ACAD