|About this Abstract
||MS&T23: Materials Science & Technology
||Ceramics for New Generation Nuclear Energy System Application
||Iron-phosphate Glasses for the Immobilization of Dehalogenated Chloride-based Waste Salt
||Harmony S. Werth, Paige Murray, Jade Beland, Brian Riley, Krista Carlson
|On-Site Speaker (Planned)
||Harmony S. Werth
Dehalogenated salt iron phosphate glass forms (DPFs) are promising materials to immobilize salt waste produced from the electrochemical reprocessing of used nuclear fuel. However, the leading candidate glasses devitrify during realistic cooling conditions, which can lead to challenges associated with processing and chemical durability. In this talk, we will discuss dehalogenation results and previously unreported alkali iron phosphate glass-forming compositions with good thermal stability and chlorine tolerance. Dehalogenation was performed by mixing phosphoric acid with a simulated alkali chloride-based salt waste and heating between 300-600˚C, depending on the desired level of dechlorination. Glass components were combined with the dehalogenated product and vitrified. Dehalogenation and DPF synthesis were performed in air and argon. The collected data was used to develop composition-property models, as well as property and composition constraints. This information is critical to advance the phosphate-based dehalogenation approach towards a higher Technology Readiness Level.