One-step method for preparing pyrochlore-phase borosilicate glass-ceramic solidified substrate

A silicate glass and ceramic solidification technology, applied in radioactive purification, nuclear engineering, etc., can solve the problems of difficult realization of high-level radioactive nuclear waste solidification treatment engineering, unfavorable control of crystal phase and composition, and unsuccinct process, etc., to achieve Excellent chemical stability, uniform crystal phase size, and good structural stability

Active Publication Date: 2022-02-08
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, the pyrochlore-rich borosilicate glass-ceramic solidified substrate is difficult to synthesize, and the mainstream methods for preparing glass-ceramic solidified bodies are still melting-crystallization and sintering
The melting-crystallization method requires high-temperature reheating, which is not conducive to the control of crystal phase and composition; the sintering method is similar to the ceramic solidification process, and the process is cumbersome and requires high equipment
The history of research and practice in this field shows that these two processes are not simple enough to be easily engineered for the immobilization of high-level nuclear waste

Method used

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  • One-step method for preparing pyrochlore-phase borosilicate glass-ceramic solidified substrate
  • One-step method for preparing pyrochlore-phase borosilicate glass-ceramic solidified substrate
  • One-step method for preparing pyrochlore-phase borosilicate glass-ceramic solidified substrate

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Experimental program
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Embodiment 1

[0027] A method for preparing a pyrochlore-phase borosilicate glass-ceramic solidified base material in one step, comprising the following steps:

[0028] a. Ingredients: Na 2 SiO 3 , CaF 2 、H 3 BO 3 , Nb 2 o 5 、TiO 2 、Nd 2 o 3 , Al(OH) 3 , SiO 2 as raw material, according to Na 2 SiO 3 33.8 parts by weight, CaF 2 8.8 parts by weight, H 3 BO 3 6.2 parts by weight, Nb 2 o 5 21.6 parts by weight, TiO 2 4.5 parts by weight, Nd 2 o 3 15.0 parts by weight, Al(OH) 3 4.3 parts by weight, SiO 2 The proportioning of 5.8 parts by weight gets each raw material;

[0029]b. Mixing: put each raw material into a ball milling equipment with absolute ethanol as a medium for ball milling and mixing for 4 hours to obtain a homogeneously mixed compound slurry;

[0030] c. Drying: Dry the compound slurry in a constant temperature drying oven for 24 hours, discharge the absolute ethanol and water in the raw materials, and prepare the compound;

[0031] d. Melting: Heat...

Embodiment 2

[0034] A method for preparing a pyrochlore-phase borosilicate glass-ceramic solidified base material in one step, comprising the following steps:

[0035] a. Ingredients: Na 2 SiO 3 , CaF 2 、H 3 BO 3 , Nb 2 o 5 、TiO 2 、Nd 2 o 3 , Al(OH) 3 , SiO 2 as raw material, according to Na 2 SiO 3 34.6 parts by weight, CaF 2 7.7 parts by weight, H 3 BO 3 7.0 parts by weight, Nb 2 o 5 22.4 parts by weight, TiO 2 4.4 parts by weight, Nd 2 o 3 14.5 parts by weight, Al(OH) 3 3.4 parts by weight, SiO 2 The proportioning of 6.0 parts by weight gets each raw material;

[0036] b. Mixing: put each raw material into a ball milling equipment with absolute ethanol as a medium for ball milling and mixing for 6 hours to obtain a homogeneously mixed compound slurry;

[0037] c. Drying: Dry the batch slurry in a constant temperature drying oven for 36 hours, and discharge the absolute ethanol and water in the raw materials to prepare the batch.

[0038] d. Melting: Heat th...

Embodiment 3

[0041] A method for preparing a pyrochlore-phase borosilicate glass-ceramic solidified base material in one step, comprising the following steps:

[0042] a. Ingredients: Na 2 SiO 3 , CaF 2 、H 3 BO 3 , Nb 2 o 5 、TiO 2 、Nd 2 o 3 , Al(OH) 3 , SiO 2 as raw material, according to Na 2 SiO 3 34.9 parts by weight, CaF 2 8.4 parts by weight, H 3 BO 3 6.9 parts by weight, Nb 2 o 5 24.6 parts by weight, TiO 2 3.5 parts by weight, Nd 2 o 3 12.8 parts by weight, Al(OH) 3 3.4 parts by weight, SiO 2 The proportioning of 5.5 parts by weight gets each raw material;

[0043] Others are the same as embodiment 1 or 2, omitted.

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Abstract

The invention discloses a method for preparing a pyrochlore-phase borosilicate glass ceramic solidified base material in one step, and is characterized in that: 2 SiO 3 30~40 parts, CaF 2 7~9.5 parts, H 3 BO 3 6~8.5 parts, Nb 2 o 5 15~25 parts, TiO 2 3.5~6 parts, Nd 2 o 3 12~18.5 parts, Al(OH) 3 2~4.5 parts, SiO 2 3.5 to 6.5 parts by weight of each raw material; use absolute ethanol or / and water as the medium, put the raw materials into a ball mill for ball milling; dry; keep warm at 1200°C to 1400°C for 1 to 3 hours; transfer to a holding furnace In the process, lower the temperature to 450-500°C and keep it warm for 1-4 hours, then cool it down to obtain it. The pyrochlore-phase borosilicate glass ceramic solidified base material prepared by the invention has good structural stability, good chemical stability and high reliability, and can be used for solidification treatment of high-level radioactive nuclear waste.

Description

technical field [0001] The invention belongs to the preparation of glass ceramic solidified base material of high radioactive nuclear waste, and relates to a method for preparing pyrochlore-phase borosilicate glass ceramic solidified base material in one step. The invention uses pyrochlore-phase borosilicate glass ceramics as a solidification base material for solidification treatment of radioactive nuclear waste, and is suitable for solidification treatment of high-level radioactive nuclear waste discharged from nuclear industry and other fields. Background technique [0002] Nuclear energy is an efficient and clean energy. The peaceful use of nuclear energy has had a profound impact on the country's adjustment of energy structure, promotion of energy conservation and emission reduction, and response to climate change. For nearly half a century, with the development of nuclear power plants and the decommissioning of military nuclear weapons, more and more high-level nuclear...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C10/16C03C10/04C03C6/04C03C6/06C03C6/02C03B25/00G21F9/16
CPCC03C10/16C03C1/00C03B25/00G21F9/162
Inventor 廖其龙吴康明竹含真王辅
Owner SOUTHWEAT UNIV OF SCI & TECH
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