Preparation and Characterization of High Stability SrF2-Na2O-Fe2O3-P2O5 System Fluorphosphate Glass

Abstract

Abstract: ⁹⁰SrF₂ and waste with high content of Na₂O, Fe₂O₃, P₂O₅ are two kinds of waste generated from nuclear power plants. Glass wasteforms composed mainly of SrF₂, Na₂O, Fe₂O₃ and P₂O₅ can be prepared when the two kinds of wastes are combined to solidify. Glass forming ability, actual composition, structure and thermal stability of samples in SrF₂-Na₂O-Fe₂O₃-P₂O₅ system were investigated by X-ray fluorescence spectrometer, X-ray diffractive spectrometer, infrared spectrometer, thermal expansion instrument and differential thermal analyzer. The water resistance was studied by dissolution rate method and product consistency test method. The results show that the mass loss of Sr is little but the mass loss of F is as high as 30%~34% in glass after melting at 1 000 ℃ for 0.5 h. With the decrease of P₂O₅/SrF₂ molar ratio, the thermal stability of glass decreases sharply, but the water resistance improves obviously. Samples with pyrophosphate glass structure have good stability, and the glass with 30% (mole fraction) SrF₂ has both high water resistance and high thermal stability.

Key words: fluorphosphate glass, high level radioactive waste, waste immobilization, high waste loading, chemical stability, thermal stability

CLC Number:

TQ174.75

LI Xiuying, TAO Xinyue, XIAO Zhuohao, HE Yifeng, LI Chaoyuan, XIA Ying, KONG Lingbing. Preparation and Characterization of High Stability SrF₂-Na₂O-Fe₂O₃-P₂O₅ System Fluorphosphate Glass[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(10): 3699-3707.

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Preparation and Characterization of High Stability SrF₂-Na₂O-Fe₂O₃-P₂O₅ System Fluorphosphate Glass

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