Title: Structural drivers controlling sulfur solubility in alkali aluminoborosilicate glasses

Journal Article · · Journal of the American Ceramic Society
DOI: https://doi.org/10.1111/jace.17778 · OSTI ID:1787156
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [1]
  1. Department of Materials Science and Engineering Rutgers, The State University of New Jersey Piscataway NJ USA
  2. Science and Technology Division Corning Incorporated Corning NY USA
  3. Centre of Excellence Sterlite Technologies Ltd, MIDC Waluj Aurangabad India

Abstract If the direct feed approach to vitrify the Hanford's tank waste is implemented, the low activity waste (LAW) will comprise higher concentrations of alkali/alkaline‐earth sulfates than expected under the previously proposed vitrification scheme. To ensure a minimal impact of higher sulfate concentrations on the downstream operations and overall cost of vitrification, advanced glass formulations with enhanced sulfate loadings (solubility) are needed. While, the current sulfate solubility predictive models have been successful in designing LAW glasses with sulfate loadings <2 wt.%, it will be difficult for them to design glass compositions with enhanced loadings due to our limited understanding of the fundamental science governing these processes. In this pursuit, this article unearths the underlying compositional and structural drivers controlling the sulfate solubility in model LAW glasses. It has been shown that the preferentially removes non‐framework cations from the modifier sites in the silicate network, thus, leading to the polymerization in the glass network via the formation of ring‐structured borosilicate units. Furthermore, though the sulfate solubility slightly decreases with increasing Li + /Na + in the glasses, the prefers to be charge compensated by Na + , as it is easier for to break Na–O bonds instead of Li–O bonds.

Sponsoring Organization:
USDOE
Grant/Contract Number:
89304018CEM000006
OSTI ID:
1787156
Journal Information:
Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 10 Vol. 104; ISSN 0002-7820
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United States
Language:
English

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