Submixture model to predict nepheline precipitation in waste glasses

Vienna, John D.; Kroll, Jared O.; Hrma, Pavel R.; Lang, Jesse B.; Crum, Jarrod V.

doi:10.1111/ijag.12207

Submixture model to predict nepheline precipitation in waste glasses

Journal Article · Wed May 11 00:00:00 EDT 2016 · International Journal of Applied Glass Science

DOI:https://doi.org/10.1111/ijag.12207· OSTI ID:1400970

Vienna, John D. ^[1]; Kroll, Jared O. ^[1]; Hrma, Pavel R. ^[1]; Lang, Jesse B. ^[1]; Crum, Jarrod V. ^[1]

Pacific Northwest National Laboratory Richland Washington

Abstract

High‐alumina high‐level waste ( HLW ) glasses are prone to nepheline precipitation during canister‐centerline cooling ( CCC ). If sufficient nepheline forms, the chemical durability of the glass will be significantly impacted. Overly conservative constraints have been developed and used to avoid the deleterious effects of nepheline formation in U.S. HLW glasses. The constraints used have been shown to significantly limit the loading of waste in glass at Hanford and therefore the cost and schedule of cleanup. A 90‐glass study was performed to develop an improved understanding of the impacts of glass composition on the formation of nepheline during CCC . The CCC crystallinity data from these glasses were combined with 657 glasses found in the literature. The trends showed significant effects of Na ₂ O, Al ₂ O ₃ , SiO ₂ , B ₂ O ₃ , CaO, Li ₂ O, and potentially K ₂ O on the propensity for nepheline formation. A pseudo‐ternary submixture model was proposed to identify the glass composition region prone to nepheline precipitation. This pseudo‐ternary with axes of SiO ₂ + 1.98B ₂ O ₃ , Na ₂ O + 0.653Li ₂ O + 0.158CaO, and Al ₂ O ₃ was found to divide glasses that precipitate nepheline during CCC from those that do not. Application of this constraint is anticipated to increase the loading of Hanford high‐alumina HLW s in glass by roughly one‐third.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1400970

Alternate ID(s):: OSTI ID: 1372992

Journal Information:: International Journal of Applied Glass Science, Journal Name: International Journal of Applied Glass Science Journal Issue: 2 Vol. 8; ISSN 2041-1286

Publisher:: Wiley-BlackwellCopyright Statement

Country of Publication:: United States

Language:: English

References (15)

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