Evaluations of glass vitrification techniques on iron ratio determinations
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 colorimetric 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 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.
- Research Organization:
- Westinghouse Savannah River Co., Aiken, SC (United States)
- Sponsoring Organization:
- DOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC09-89SR18035
- OSTI ID:
- 5341000
- Report Number(s):
- WSRC-MS-91-529; CONF-920430--82; ON: DE92013117
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
052002 -- Nuclear Fuels-- Waste Disposal & Storage
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
ABSORPTION SPECTROSCOPY
BOROSILICATE GLASS
CERAMIC MELTERS
CHARGED PARTICLES
CHEMICAL REACTIONS
CONCENTRATION RATIO
CRUCIBLES
ELECTRIC FURNACES
FURNACES
GLASS
HEATING
HIGH-LEVEL RADIOACTIVE WASTES
IONS
IRON IONS
MANAGEMENT
MATERIALS
MICROWAVE HEATING
PROCESSING
RADIOACTIVE MATERIALS
RADIOACTIVE WASTES
REDOX REACTIONS
SEALS
SPECTROSCOPY
VITRIFICATION
WASTE MANAGEMENT
WASTE PROCESSING
WASTES