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- W16227844 abstract "Silicotitanate ion exchange materials are being considered for removal of radioactive Cs and Sr from tank wastes at the Hanford site. The phase evolution as a function of heat treatment temperature for several sol gel derived compositions within the Cs{sub 2}O-SiO{sub 2}-TiO{sub 2} system was investigated, in order to determine if an adequate waste form can be achieved by direct thermal conversion. The Cs leach rates and Cs loss during heat treatment of select materials were measured. Some compositions which contain large amounts of Ti melt to form a glass with reasonably low aqueous leach rates. A new Cs-silicotitanate material with a structure isomorphous to pollucite was discovered. This material forms at low temperatures (700--800 C) where Cs volatility is negligible. The silicotitanate-pollucite exhibits extremely low leach rates (1.42 g/m{sup 2}day ) at 90 C, and has been identified as a promising waste form for Cs containment." @default.
- W16227844 created "2016-06-24" @default.
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- W16227844 date "1995-04-01" @default.
- W16227844 modified "2023-09-25" @default.
- W16227844 title "Waste forms based on Cs-loaded silicotitanates" @default.
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- W16227844 doi "https://doi.org/10.2172/86952" @default.
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