Phase and Structure Transitions of High-Level Liquid Waste Calcine and Glass at Elevated Temperature

Abstract

Abstract: The vitrification of high-level liquid waste (HLLW) is one of the challenges in the reprocessing of spent nuclear fuel in China. The feed-to-glass conversion comprising quite complex chemical reactions and structure transitions has been of great concern. In this paper, the phase and structure transitions of the heat-treated feed (mixture of simulated HLLW calcine and glass frit) during vitrification were analyzed with DSC, in-situ XRD, NMR and Raman. The results show that the simulated HLLW calcine begins to dissolve in the glass frit at ~700 ℃, and the intermediate phases of aluminosilicates appeare at 800~900 ℃. During the reactions of HLLW calcine and glass frit at elevated temperatures, most of network modifiers from HLLW enter into the glass network of glass frit, resulting in a decrease of the network polymerization.

Key words: high-level liquid waste, vitrification, phase transition, glass structure, elevated temperature reaction, silicate glass

CLC Number:

TQ171

FANG Guang, XU Dongqing, TAN Shengheng, ZHANG Hua, JIA Ruidong, XU Kai. Phase and Structure Transitions of High-Level Liquid Waste Calcine and Glass at Elevated Temperature[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(11): 4075-4080.

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