About this Abstract |
Meeting |
MS&T24: Materials Science & Technology
|
Symposium
|
Ceramic Materials for Nuclear Energy Systems
|
Presentation Title |
Composition and Properties of Iron Phosphate Waste Forms for Radioactive Salt Waste Immobilization |
Author(s) |
Harmony S. Werth, Paige Murray, Jade Beland, Charmayne Lonergan, Brian Riley, Michael Simpson, Krista Carlson |
On-Site Speaker (Planned) |
Harmony S. Werth |
Abstract Scope |
Dehalogenated salt iron phosphate glass waste forms (DPFs) are promising materials for the immobilization of radioactive salt waste. The leading candidate glasses devitrify during realistic cooling conditions, which can lead to challenges associated with processing and chemical durability. Furthermore, molten DPFs attack many common crucible materials. Dehalogenation was performed by mixing phosphoric acid with a simulated alkali chloride salt waste containing surrogate fission products and heating at 400˚C. Iron oxide was combined with the dehalogenated product and vitrified. In materials interaction experiments, a rod of the selected material was immersed in the molten DPF. Experiments were performed in air and argon atmospheres. The resulting DPFs were analyzed with SEM/EDS, HPLC, ICP-MS, and Mössbauer spectroscopy. 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. |