Predictive modeling of crystal accumulation in high-level waste glass melters processing radioactive waste

The effectiveness of high-level waste vitrification at Hanford's Waste Treatment and Immobilization Plant may be limited by precipitation/accumulation of spinel crystals [(Fe, Ni, Mn, Zn)(Fe, Cr)2O4] in the glass discharge riser of Joule-heated ceramic melters during idling. These crystals do n...

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Published in:Journal of nuclear materials 2017-11, Vol.495, p.322-331
Main Authors: Matyáš, Josef, Gervasio, Vivianaluxa, Sannoh, Sulaiman E., Kruger, Albert A.
Format: Article
Language:English
Subjects:
Accumulation
Agglomerates
Agglomeration
Cans
Chemical precipitation
Crystals
Discharge
Durability
Glass
Immobilization
Iron
Level (quantity)
MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
Manganese
MATERIALS SCIENCE
Mathematical models
Nickel
Radioactive wastes
Single crystals
Vitrification
Waste treatment
Zinc
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description The effectiveness of high-level waste vitrification at Hanford's Waste Treatment and Immobilization Plant may be limited by precipitation/accumulation of spinel crystals [(Fe, Ni, Mn, Zn)(Fe, Cr)2O4] in the glass discharge riser of Joule-heated ceramic melters during idling. These crystals do not affect glass durability; however, if accumulated in thick layers, they can clog the melter and prevent discharge of molten glass into canisters. To address this problem, an empirical model was developed that can predict thicknesses of accumulated layers as a function of glass composition. This model predicts well the accumulation of single crystals and/or small-scale agglomerates, but excessive agglomeration observed in high-Ni-Fe glass resulted in an underprediction of accumulated layers, which gradually worsened over time as an increased number of agglomerates formed. The accumulation rate of ∼53.8 ± 3.7 μm/h determined for this glass will result in a ∼26 mm-thick layer after 20 days of melter idling. [Display omitted] •Spinel formers can encourage high agglomeration of crystals, producing thick layers.•Liquidus temperature constraint cannot prevent crystal accumulation.•Model developed predicts well the accumulation of single crystals and small agglomerates.•Noble metals optimization of concentration can eliminate crystal accumulation.
doi_str_mv 10.1016/j.jnucmat.2017.08.034
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source ScienceDirect Journals
subjects Accumulation
Agglomerates
Agglomeration
Cans
Chemical precipitation
Crystals
Discharge
Durability
Glass
Immobilization
Iron
Level (quantity)
MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
Manganese
MATERIALS SCIENCE
Mathematical models
Nickel
Radioactive wastes
Single crystals
Vitrification
Waste treatment
Zinc
title Predictive modeling of crystal accumulation in high-level waste glass melters processing radioactive waste
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