Evaluations of glass vitrification techniques on iron ratio determinations
- Westinghouse Savannah River Co., Aiken, SC (United States)
High-level liquid waste at the Savannah River Site (SRS) will be processed into borosilicate glass at the Defense Waste Processing Facility (DWPF). Waste glass will be transported to a geologic repository for permanent disposal. Control of the redox properties of the melter feed is necessary for smooth operation of the melter. The Fe(II)/total Fe ratio in glass is a measure of the redox conditions in the melter. To simulate final glass product conditions, melter feed samples will be vitrified at the DWPF laboratory. A calorimetric method was used to determine the Fe(II)/total Fe ratio on vitrified melter feed samples. Because the crucible vitrification technique can have a large effect on the Fe(II)/total Fe ratio, crucible sealing during vitrification of the waste feed sample, and the type of heating applied during vitrification, were the variables investigated for Fe(II)/total Fe ratio measurement effects. Various lid sealants were used for determining crucible sealing effects. Microwave and conventional heating were tested for glass vitrifications. Microwave heating and a nepheline gel sealant, to exclude oxygen from the alumina crucibles during vitrification, was adopted for use at the DWPF laboratory. This paper discusses microwave vitrification and crucible sealing techniques.
- OSTI ID:
- 103045
- Report Number(s):
- CONF-920430--Vol.2
- Country of Publication:
- United States
- Language:
- English
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