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Glass solidified body and preparation method thereof

A vitrification and radionuclide technology, applied in radioactive purification, nuclear engineering, etc., can solve the problems of unfavorable industrialization and high melting temperature, and achieve the effects of low melting temperature, good chemical stability and good application prospects

Active Publication Date: 2012-07-04
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Under the ideal state of solidification, pure silica glass has the best chemical stability, but its melting temperature is too high, which is not conducive to industrialization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Analytical pure SiO after drying 2 74%, Al 2 o 3 15%, B 2 o 3 10%, CeO 2 1% is used as simulated radionuclide, and the raw materials are accurately weighed according to the ratio. After the raw materials are ground and mixed evenly by a ball mill, they are poured into a crucible, and then the crucible is placed in a lifting furnace, and the temperature is raised to 1400°C at a speed of 10°C / min, and kept for 3 hours, and then the glass liquid is poured into a copper mold preheated at 300°C , followed by annealing at 700°C for 2h to eliminate the internal stress of the glass, and finally cooling to room temperature at an average speed of 2°C / min. The obtained vitrified solidified body was analyzed according to the PCT method in the ASTM standard for anti-leaching performance, and the measured standardized leaching rate of 28d Ce element was 3.6×10 -5 g·m -2 d -1 .

Embodiment 2

[0022] Analytical pure SiO after drying 2 71.5%, Al 2 o 3 14%, B 2 o 3 9.5%, CeO 2 5% is simulated radionuclide, and the raw materials are accurately weighed according to the ratio. After the raw materials are ground and mixed evenly by a ball mill, they are poured into a crucible, and then the crucible is placed in a lifting furnace, and the temperature is raised to 1400°C at a speed of 10°C / min, and the temperature is kept for 3.5h, and then the glass liquid is poured into a copper mold preheated at 300°C , followed by annealing at 700°C for 2h to eliminate the internal stress of the glass, and finally cooled to room temperature at an average speed of 2°C / min. The obtained vitrified body was analyzed according to the PCT method in the ASTM standard for anti-leaching performance, and the measured standardized leaching rate of 28d Ce element was 6.6×10 -6 g·m -2 d -1 .

Embodiment 3

[0024] Analytical pure SiO after drying 2 70%, Al 2 o 3 14%, B 2 o 3 9%, CeO 2 7% is simulated radionuclide, and the raw materials are accurately weighed according to the ratio. After the raw materials are ground and mixed evenly by a ball mill, they are poured into a crucible, and then the crucible is placed in a lifting furnace, and the temperature is raised to 1350°C at a speed of 10°C / min, and kept for 3 hours, and then the glass liquid is poured into a copper mold preheated at 300°C , followed by annealing at 700°C for 2h to eliminate the internal stress of the glass, and finally cooling to room temperature at an average speed of 2°C / min. The obtained vitrified body was analyzed according to the PCT method in the ASTM standard for anti-leaching performance, and the measured standardized leaching rate of 28d Ce element was 8.9×10 -6 g·m -2 d -1 .

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Abstract

The invention discloses a glass solidified body and a preparation method thereof, which belong to the field of material preparation of solidified bodies. The glass solidified body comprises components: by mass percentage, 67-74% of Sio2, 13-15% of A12O3, 9-10% of B2O3, and 1-11% of CeO2. The preparation method includes: grinding the components according to proportion and mixing the same uniformly, melting the mixture for 2.5-3.5 hours at the temperature ranging from 1350 DEG C to 1400 DEG C, forming, annealing and cooling finally. The glass solidified body is used for solidification treatment of high-level waste, is fine in chemical stability, evident in solidifying effect and high in leaching rate resistance and has excellent application prospect. The preparation method of the glass solidified body is simple in process, low in melting temperature and easy to control during production.

Description

technical field [0001] The invention relates to the field of preparation of solidified body materials, in particular to a glass solidified body and a preparation method thereof. Background technique [0002] A small amount of actinides in high-level radioactive waste can exist in nature for a long time and cause radioactive damage to organisms, and the solidification of high-level radioactive waste can effectively dispose of the actinides. There are three commonly used curing methods: ceramic curing, glass ceramic curing and vitrification. Ceramic solidification has a large containment capacity for radioactive elements in high-level radioactive waste, and the thermal stability of crystals relative to glass is strong, but ceramic solidification has strong selectivity for radioactive elements, and most of the non-radioactive waste in actual high-level radioactive waste will The effect of ceramic curing has a great influence. Glass-ceramic solidification can well solve the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/34C03C14/00
Inventor 丁新更李鹏杨辉
Owner ZHEJIANG UNIV
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