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 https://doi.org/10.1016/j.jnoncrysol.2019.04.040

[img] Text
pdfft_md5=e26d23c57e833c03e76b49f8bc11d3b8&pid=1-s2.0-S0022309319302674-main.pdf
Restricted to Repository staff only

Download (7kB) | Request a copy
[img] Text
Revised+Li-Mg-EM+paper+-+Tom+Gout+17-04-19.pdf - Published Version
Restricted to Registered users only

Download (1MB) | Request a copy
Official URL: https://doi.org/10.1016/j.jnoncrysol.2019.04.040

Abstract

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: https://doi.org/10.1016/j.jnoncrysol.2019.04.040
Depositing User: Sarah Humbert
Date Deposited: 17 May 2019 12:33
Last Modified: 17 May 2019 12:33
URI: http://eprints.esc.cam.ac.uk/id/eprint/4492

Actions (login required)

View Item View Item

About cookies