Cassingham, N., Corkhill, C.L., Backhouse, D.J. et al. (4 more authors) (2015) The initial dissolution rates of simulated UK Magnox-ThORP blend nuclear waste glass as a function of pH, temperature and waste loading. Mineralogical Magazine, 79 (6). pp. 1529-1542. ISSN 0026-461X
Abstract
The first comprehensive assessment of the dissolution kinetics of simulant Magnox–ThORP blended UK high-level waste glass, obtained by performing a range of single-pass flow-through experiments, is reported here. Inherent forward rates of glass dissolution were determined over a temperature range of 23 to 70°C and an alkaline pH range of 8.0 to 12.0. Linear regression techniques were applied to the TST kinetic rate law to obtain fundamental parameters necessary to model the dissolution kinetics of UK high-level waste glass (the activation energy (E a), pH power law coefficient (η) and the intrinsic rate constant (k0)), which is of importance to the post-closure safety case for the geological disposal of vitreous products. The activation energies based on B release ranged from 55 ± 3 to 83 ± 9 kJ mol–1, indicating that Magnox–THORP blend glass dissolution has a surface-controlled mechanism, similar to that of other high-level waste simulant glass compositions such as the French SON68 and LAW in the US. Forward dissolution rates, based on Si, B and Na release, suggested that the dissolution mechanism under dilute conditions, and pH and temperature ranges of this study, was not sensitive to composition as defined by HLW-incorporation rate.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2015 The Mineralogical Society. This is an open access article. |
Keywords: | glass; dissolution mechanism; geological disposal |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield) |
Funding Information: | Funder Grant number UNIVERSITY OF LEEDS RG.IPSE.474251 ROYAL ACADEMY OF ENGINEERING (THE) UNSPECIFIED ROYAL ACADEMY OF ENGINEERING (THE) 10144 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/L014041/1 ROYAL ACADEMY OF ENGINEERING (THE) UNSPECIFIED |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 23 Feb 2016 10:15 |
Last Modified: | 30 Jan 2019 14:54 |
Published Version: | http://dx.doi.org/10.1180/minmag.2015.079.6.28 |
Status: | Published |
Publisher: | Mineralogical Society |
Refereed: | Yes |
Identification Number: | 10.1180/minmag.2015.079.6.28 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:95469 |
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Filename: Corkhill et al (2017) accepted in press Mineralogical Magazine.pdf
Description: Corrigendum