About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Glasses and Optical Materials: Challenges, Advances, and Applications
|
| Presentation Title |
Liquidus Temperature of Phosphate Crystalline Phases in Borosilicate Waste Glasses |
| Author(s) |
Jincheng Bai, Jarrod Crum, Xiaonan Lu, John Vienna, Albert Kruger |
| On-Site Speaker (Planned) |
Jincheng Bai |
| Abstract Scope |
The formation of phosphate crystals in high-level waste (HLW) glass may hinder the steady operation of the melter and deteriorate the chemical durability of the final waste form. Exploring the liquidus temperature (TL) of phosphate crystals is important to estimate the solubility limit of phosphorus in borosilicate waste glass across complex compositions. In this study, a borosilicate waste glass matrix was statistically designed to augment existing data using the space filling method. The crystal fraction data from isothermal heat-treatment test was used for the extrapolation of phosphate TL. A combined phosphate TL dataset with new and existing data was used to develop empirical models to predict phosphate TL as function of glass composition using least squares regression method. Model results shown the addition of CaO and P2O5 strongly increased, while Li2O and MgO lowered, TL of the phosphate phases. Additionally, high Li2O plus P2O5 led to phase separation of Li3PO4. |