Moessbauer study of iron redox in West Valley glass

Conference · Sat Dec 31 00:00:00 EST 1994

OSTI ID:39195

Yaschenko, E; Salahuddin, H; Muller, I S; Pegg, I L; Macedo, P B ^[1]

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1. Catholic Univ. of America, Washington, DC (United States)

High-level nuclear wastes at West Valley are high in iron which results in a target glass composition for the vitrification process that contains about 12 wt% Fe{sub 2}O{sub 3}. We have developed a series of high-iron glass formulations (up to 21 wt% Fe{sub 2}O{sub 3}) in order to accommodate all reasonable waste stream variability. An additional process control variable is the glass redox ratio, Fe{sup 2+}/(Fe{sup 2+}+Fe{sup 3+}), since this affects the resultant glass properties including durability, crystallization, glass transition temperature, and melt viscosity. In this study, a range of redox states was obtained by bubbling CO/CO{sub 2} mixtures through the melts. The redox state was determined by Moessbauer spectroscopy and correlations between redox state and CO/CO{sub 2} ratio, flow rate, and time were obtained. Analysis of the spectroscopic data provides additional information on changes in the occupation of tetrahedral and octahedral sites with redox state.

• OSTI ID: 39195
• Report Number(s): CONF-940416-; TRN: 95:000602-0030
• Resource Relation: Conference: 96. annual meeting of the American Ceramic Society (ACS), Indianapolis, IN (United States), 25-28 Apr 1994; Other Information: PBD: 1994; Related Information: Is Part Of Ceramic transactions: Environmental and waste management issues in the ceramic industry II. Volume 45; Bickford, D.; Bates, S.; Jain, V.; Smith, G. [eds.]; PB: 513 p.
• Country of Publication: United States
• Language: English

Related Subjects

05 NUCLEAR FUELS
40 CHEMISTRY
GLASS
CRYSTALLIZATION
CHEMICAL COMPOSITION
WEST VALLEY PROCESSING PLANT
RADIOACTIVE WASTE PROCESSING
RADIOACTIVE WASTES
VITRIFICATION
IRON
REDOX REACTIONS
IRON OXIDES
CARBON MONOXIDE
METALLURGICAL EFFECTS
CARBON DIOXIDE
PROCESS CONTROL
TRANSITION TEMPERATURE
GAMMA SPECTROSCOPY
COBALT 57
REACTION KINETICS