Chromium Phase Behavior in a Multi-Component Borosilicate Glass Melt

Journal Article · Mon Jul 31 04:00:00 EDT 2006 · Journal of Non-Crystalline Solids

DOI:https://doi.org/10.1016/j.jnoncrysol.2006.02.051· OSTI ID:889047

Hrma, Pavel R; Vienna, John D; Wilson, B K; Plaisted, Trevor J; Heald, Steve M

This paper reports the phase behavior of a multicomponent borosilicate glass melt with 0.3 mass% Cr2O3 at 800 1500°C in equilibrium with air. Both upper and lower liquidus temperatures were observed. When the temperature was between the upper and lower liquidus temperatures, eskolaite (Cr2O3) formed in melts with >2 mass% Cr2O3. Below the lower liquidus temperature, a dispersed chromate phase appeared in the melt that eventually became macroscopically segregated. The chemical durability of the glasses was virtually unaffected by chromium concentration. The particular glass studied was prototypic for the vitrification of high-Cr high-level radioactive wastes stored in underground tanks at the Hanford site. The results suggest a significant potential cost benefit for Hanford tank waste cleanup.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 889047
• Report Number(s): PNNL-SA-46889; 2302; KP1302000
• Journal Information: Journal of Non-Crystalline Solids, Journal Name: Journal of Non-Crystalline Solids Journal Issue: 21-22 Vol. 352; ISSN 0022-3093; ISSN JNCSBJ
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
AIR
BOROSILICATE GLASS
CHROMATES
CHROMIUM
Chromium
Glass
Phase
Eskolaite
Spinel
Redox
Equilibrium
Silicate
Borosilicate
Melt
Environmental Molecular Sciences Laboratory
GLASS
HIGH-LEVEL RADIOACTIVE WASTES
TANKS
VITRIFICATION
WASTES