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

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...

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

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