Abstract
AbstractThe corrosion mechanisms and kinetics of a Mg-rich alkali aluminoborosilicate glass simulating UK high-level waste (CaZn28) were investigated upon dissolution in synthetic cement solutions. Dissolution varied as a function the different pH and alkali/alkaline earth content of each cement solution. High resolution microscopy and spectroscopy techniques ascertained the nature of the interface between the glass and the cement solutions. TEM-EDS revealed alkali- and alkaline earth-rich silica gels, into which K, Ca and Mg were incorporated. TEM-SAED, combined with synchrotron micro-focus XRD, identified the ubiquitous precipitation of the Mg-aluminate layered double hydroxide phase, meixnerite (Mg6Al2(OH)18·4H2O), in addition to goethite (FeOOH) and crystalline silica. The C-S-H phase, tobermorite (Ca5Si6O16(OH)2·4H2O), was identified in the most Ca-rich solution only. These data give insight to the role of alkali/alkaline earth-rich solutions in the dissolution or radioactive waste glasses, of importance to the final disposition in a geological disposal facility.
Funder
RCUK | Engineering and Physical Sciences Research Council
U.S. Department of Energy
The funder is "The US Department of Energy, Office of Science User Facility"
The funder is "The US Department of Energy, Energy’s Office of Environmental Management (EM) Tank Waste Management program'
Publisher
Springer Science and Business Media LLC
Subject
Materials Chemistry,Materials Science (miscellaneous),Chemistry (miscellaneous),Ceramics and Composites
Reference68 articles.
1. Bel, J. J. P., Wickham, S. M. & Gens, R. M. F. Development of the supercontainer design for deep geological disposal of high-level heat emitting radioactive waste in Belgium. Mater. Res. Soc. Symp. Proc. 932, 23–32 (2006).
2. Van Geet, M. & Weetjens, E. Strategic choices in the Belgian supercontainer design and its treatment in the safety case. NEA/OECD Report number NEA/RWM/R(2012)3/REV, 1–6 (2012).
3. Geological disposal: steps towards implementation. Nuclear Decommissioning Authority Report. NDA/RWMD/013 (2010).
4. Gin, S. et al. The fate of silicon during glass corrosion under alkaline conditions: a mechanistic and kinetic study with the International Simple Glass. Geochim. Cosmochim. Acta 151, 68–85 (2015).
5. Corkhill, C. L., Cassingham, N. J., Heath, P. G. & Hyatt, N. C. Dissolution of UK high-level waste glass under simulated hyperalkaline conditions of a co-located geological disposal facility. Int. J. Appl. Glas. Sci. 4, 341–356 (2013).
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