Abstract
Glassy waste forms based on SrF2-Fe2O3-PbO/Bi2O3-P2O5 system were prepared by using a one-step melting quench method. Glass forming ability, actual composition, structure and thermal stability of the samples were studied by using X-Ray fluorescence (XRF) spectroscopy, X-Ray diffractometry (XRD), infrared spectroscopy (IR), dilatometry and differential thermal analysis (DTA). Water resistance of the samples was evaluated by using dissolution rate and Product Consistency Test (PCT) methods. Melting temperature of the simulated 90SrF2 waste forms was reduced to 1000–1050 °C and their melting time was shortened to 0.5 h. Water resistance of the waste forms met the requirements of national industrial standard EJ1186–2005, while their thermal stability was much higher than those of the phosphate waste forms vitrified with >20 wt.% halide wastes reported in the open literature. It is concluded that waste forms with mixed structure of orthophosphate and pyrophosphate glasses have high water resistance and high thermal stability.
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