Date

2020-09-01

Author

Sargın, Irmak
Lonergan, Charmayne E.
Vienna, John D.
McCloy, John S.
Beckman, Scott P.

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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High-level waste (HLW) glasses with high alumina content are prone to nepheline crystallization during the slow canister cooling that is experienced during large-scale production. Because of its detrimental effects on glass durability, nepheline (NaAlSiO4) precipitation must be avoided; however, developing robust, predictive models for nepheline crystallization behavior in compositionally complex HLW glasses is difficult. Using overly conservative constraints to predict nepheline formation can limit the waste loading to lower than the achievable capacity. In this study, a robust data-driven model using five compositional features has been developed to predict nepheline formation. A new descriptor is introduced called the "difference based on correlation", which has higher accuracy compared to previous descriptors and also has more balanced false positive and false negative rates. The analysis of the model and the data show an overlap, instead of a distinct compositional boundary, between glasses that form and do not form nepheline. As a result, the model's predictive accuracy is not the same throughout the feature space and instead is dependent on the location of the glass composition in the dimensionally reduced feature space.

Subject Keywords

data-science, classification, high-level waste glass, nepheline, THERMODYNAMIC ASSESSMENT, LIQUIDUS, SODIUM, IRON, SPECIATION

URI

https://hdl.handle.net/11511/96209

Collections

Department of Metallurgical and Materials Engineering, Article