29 October 2017 to 3 November 2017
Australia/Sydney timezone

Effects of Li, Ca, Fe, and B on NaAlSiO4 nepheline crystallization in high level waste glasses

31 Oct 2017, 12:00
Oral Presentation National and international collaborative waste management programs Glass Wasteforms


Prof. John McCloy (Washington State University)


Owing to high concentrations of Al2O3 from dissolved fuel cladding and Na2O from basification of the waste, about half of the high-level waste by volume at Hanford, Washington, USA is rich in both Na and Al. Formulations of high waste-loading glasses result in lower amounts of SiO2, which often leads to undesirable precipitation of nepheline (NaAlSiO4). Nepheline crystallization can be affected by modifiers (Li, Ca) added to lower viscosity and improve electrical conductivity of the melt. Also, B is frequently added to reduce viscosity, and Fe is present in varying amounts from steel tank corrosion. Given the existence of various natural minerals of the stoichiometries (Na,Li,Ca0.5)(Al,Fe,B)SiO4, we sought to study the effects of substitution in the stoichiometric nepheline glass on the resulting crystallization. We summarize here several years of work, including characterization by nuclear magnetic resonance, vibrating sample magnetometry, Raman spectroscopy, thermal analysis, x-ray diffraction, electron microscopy, and electron microprobe.

Primary author

Prof. John McCloy (Washington State University)


Mr Ambar Deshkar (Rutgers University) Prof. Ashutosh Goel (Rutgers University) Mr Jose Marcial (Washington State University) Mr Mostafa Ahmadzadeh (Washington State University) Mr Yaquoot Shaharyar (Rutgers University)

Presentation Materials

Your browser is out of date!

Update your browser to view this website correctly. Update my browser now