Melter Feed Reactions at T ≤ 700°C for Nuclear Waste Vitrification
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Batch reactions and phase transitions in a nuclear waste feed heated at 5 K min-1 up to 600°C were investigated by optical microscopy, scanning electron microscopy with energy dispersive X-ray spectrometer, and X-ray diffraction. Quenched samples were leached in deionized water at room temperature and 80°C to extract soluble salts and early glass-forming melt, respectively. To determine the content and composition of leachable phases, the leachates were analyzed by the inductively-coupled plasma spectroscopy. By ~400°C, gibbsite and borax lost water and converted to amorphous and intermediate crystalline phases. Between 400°C and 600°C, the sodium borate early glass-forming melt reacted with amorphous aluminum oxide and calcium oxide to form intermediate products containing Al and Ca. At ~600°C, half Na and B converted to the early glass-forming melt, and quartz began to dissolve in the melt.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1229994
- Report Number(s):
- PNNL-SA-102293; 830403000
- Journal Information:
- Journal of the American Ceramic Society (Online), Vol. 98, Issue 10; ISSN 1551-2916
- Publisher:
- American Ceramic Society
- Country of Publication:
- United States
- Language:
- English
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