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Leaching studies of sphene-based glass-ceramics

Authors
Journal
Nuclear and Chemical Waste Management
0191-815X
Publisher
Elsevier
Publication Date
Volume
5
Issue
1
Identifiers
DOI: 10.1016/0191-815x(84)90005-6

Abstract

Abstract Glass-ceramics with sphene (CaTiSi0 5) as the major crystalline phase are being developed in Canada as candidate materials for immobilizing the wastes arising from possible future fuel recycling. Leaching studies and secondary-ion mass spectrometry depth profiling of leaching glass-ceramic samples confirm that leaching is predominantly confined to the glass phase, and is most severe with deionized water. Concentrated CaNaCl brines have a passivating effect on leaching and surface alteration phenomena, and precipitation of new phases on the sphene crystallites is observed. Crystallization, waste-element partitioning, leaching results, surface analyses and depth-profile measurements are compared and discussed.

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