Impacts of lithium on Magnox waste glass dissolution

Goût, Thomas L. and Harrison, Mike T. and Farnan, Ian (2019) Impacts of lithium on Magnox waste glass dissolution. Journal of Non-Crystalline Solids, 517. pp. 96-105. ISSN 0022-3093 DOI

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The safe storage of vitrified waste demands a thorough understanding of the effects of wasteform composition on chemical durability. One of the major compositional differences between UK glass and international glasses is the presence of Li. Based upon a 25 wt% loading UK Magnox waste glass, two seven-component analogues of molar Li:Na 1.0 and 1.5 were leached to investigate the effects of Li on chemical durability. A comprehensive 11B nuclear magnetic resonance study then took place to investigate the B network before and after dissolution. Here we show that the proportion of IIIB to IVB units did not evolve as the Li:Na ratio was varied; suggesting that Na preferentially charge compensates the B network. However, the B network was shown to leach incongruently at 90 °C. Despite Li being shown to be detrimental to durability during the earlier dissolution regimes, the residual rates of alteration implied excess Li contents had no long-term effects on chemical durability. The observed incongruent dissolution of the B network and initially decreased chemical durability could be attributed to Li preferentially modifying the Si network, thereby promoting glass hydration and B network dissolution whilst the Na compensated IVB units were less affected than IIIB units.

Item Type: Article
Uncontrolled Keywords: 2019AREP; IA75
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
12 - PhD
Journal or Publication Title: Journal of Non-Crystalline Solids
Volume: 517
Page Range: pp. 96-105
Identification Number:
Depositing User: Sarah Humbert
Date Deposited: 17 May 2019 12:33
Last Modified: 17 May 2019 12:33

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