Impacts of lithium on Magnox waste glass dissolution
Source abstract
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.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Glass properties and applications · Nuclear materials and radiation effects · Luminescence Properties of Advanced Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (46)
Show source-provided references
1. An international initiative on long-term behavior of high-level nuclear waste glass10.1016/j.mattod.2013.06.008 ↗
2. Chemical corrosion of highly radioactive borosilicate nuclear waste glass under simulated repository conditions10.1557/JMR.1990.1130 ↗
3. A mechanistic model for long-term nuclear waste glass dissolution integrating chemical affinity and interfacial diffusion barrier10.1016/j.jnucmat.2017.01.001 ↗
4. Mechanical properties of nuclear waste glasses10.1016/j.jnucmat.2010.11.034 ↗
5. History of nuclear waste glass in France10.1016/j.mspro.2014.10.002 ↗
6. Potential natural changes and implications for a UK GDF
7. Modelling the potential for permafrost development on a radioactive waste geological disposal facility in Great Britain10.1016/j.pgeola.2015.06.001 ↗
8. NDA (RWM) Report no. NDA/RWM/146
9. MET office
10. J. Busby, Geothermal prospects in the United Kingdom, Proc. World Geotherm. Congr. (2010) 25–29. http://www.geothermal-energy.org/304,iga_geothermal_conference_database.html.
11. The kinetics and mechanisms of simulated British Magnox waste glass dissolution as a function of pH, silicic acid activity and time in low temperature aqueous systems10.1016/S0883-2927(99)00118-3 ↗
12. Single-pass flow-through experiments on a simulated waste glass in alkaline media at 40 °C. II. Experiments conducted with buffer solutions containing controlled quantities of Si and Al10.1016/S0022-3115(00)00040-4 ↗
13. Geologic disposal of high-level radioactive waste: status, key issues, and trends10.1146/annurev-environ-090611-143314 ↗
14. Temperature effects on the leaching behavior of a high-level waste glass form10.13182/NT98-A2900 ↗
15. Protective properties and dissolution ability of the gel formed during nuclear glass alteration10.1016/j.jnucmat.2005.03.018 ↗
16. Effect of composition on the short-term and long-term dissolution rates of ten borosilicate glasses of increasing complexity from 3 to 30 oxides10.1016/j.jnoncrysol.2012.05.024 ↗
17. Present understanding of R7T7 glass alteration kinetics and their impact on long-term behavior modeling10.1016/S0022-3115(01)00643-2 ↗
18. Molecular mechanisms for corrosion of silica and silicate glasses10.1016/0022-3093(94)90708-0 ↗
19. Initial dissolution rate of the international simple glass as a function of ph and temperature measured using microchannel flow-through test method10.1111/ijag.12043 ↗
20. Dissolution of a complex borosilicate glass at 60 °C: The influence of pH and proton adsorption on the congruence of short-term leaching
21. The controversial role of inter-diffusion in glass alteration10.1016/j.chemgeo.2016.07.014 ↗
22. Origin and consequences of silicate glass passivation by surface layers10.1038/ncomms7360 ↗
23. Nanometre-scale evidence for interfacial dissolution–reprecipitation control of silicate glass corrosion10.1038/nmat4172 ↗
24. Vitrification of high level waste in the UK10.1016/j.mspro.2014.10.003 ↗
25. Scales · 2011
26. Composition-structure relationships in simplified nuclear waste glasses: 1. Mixed alkali borosilicate glasses10.1111/j.1551-2916.2010.04066.x ↗
27. The effect of composition on short- and long-term durability of UK HLW glass10.1016/j.mspro.2014.10.025 ↗
28. Review of the development of UK high level waste vitrified product
29. The effect on long term aqueous durability of variations in the composition of UK vitrified HLW product
30. Limit on lithium in HAL and impact on glass product quality
31. Composition changes and future challenges for the Sellafield waste Vitrification plant10.1557/PROC-1193-267 ↗
32. Preliminary surface study of short term dissolution of UK high level waste glass10.1016/j.mspro.2014.10.030 ↗
33. The effect of magnesium on the local structure and initial dissolution rate of simplified UK Magnox waste glasses10.1016/j.jnoncrysol.2018.03.002 ↗
34. ASTM · 2002
35. Modelling one- and two-dimensional solid-state NMR spectra10.1002/mrc.984 ↗
36. Boron speciation in soda-lime borosilicate glasses containing zirconium10.1111/j.1551-2916.2010.03771.x ↗
37. Site preference and Si/B mixing in mixed-alkali borosilicate glasses: a high-resolution 11B and 17O NMR study10.1021/cm034427r ↗
38. Solid-state NMR study of metastable immiscibility in alkali borosilicate glasses10.1016/S0022-3093(02)01604-6 ↗
39. Contribution of atom-probe tomography to a better understanding of glass alteration mechanisms: application to a nuclear glass specimen altered 25 years in a granitic environment10.1016/j.chemgeo.2013.04.001 ↗
40. The structural properties of Cations in nuclear glasses10.1016/j.mspro.2014.10.005 ↗
41. Competition for charge compensation in borosilicate glasses: wide-angle x-ray scattering and molecular dynamics calculations10.1103/PhysRevB.61.14495 ↗
42. SON68 glass dissolution driven by magnesium silicate precipitation10.1016/j.jnucmat.2013.08.029 ↗
43. SON68 nuclear glass dissolution kinetics: current state of knowledge and basis of the new GRAAL model10.1016/j.jnucmat.2008.06.044 ↗
44. Vernaz · 2001
45. Long-term alteration of basaltic glass: mechanisms and rates10.1016/j.gca.2014.12.011 ↗
46. Investigation of mixed alkali effect on mechanical, structural and thermal properties of three-alkali borate glass system10.1016/j.jallcom.2015.11.014 ↗