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- W61219554 abstract "West Valley Nuclear Services Company, Inc., will construct and operate facilities to vitrify two tanks of liquid radioactive waste stored at West Valley, New York. Pacific Northwest Laboratory developed the borosilicate waste glass composition and vitrification process flowsheet. The initial flowsheet work with West Valley waste uncovered several unique processing problems, including difficulties in mixing and pumping the feed slurry, formation of a stable foam glass layer in the melter, and separation of secondary phases during melting. The large quantities of inorganic ion exchange resin used to decontaminate the supernatant phase in one of the tanks added to the complexity of this waste. Selection of the reference flowsheet and glass took more than 3 years, involving five major pilot-scale vitrification system tests and numerous laboratory- and engineering-scale experiments to achieve acceptable product and processing characteristics for this waste. Investigation of slurry processing characteristics led to the development of laboratory techniques for evaluating phase separation and glass melt foaming behavior. Organic species added to the feed effectively controlled foaming by altering the glass redox state. Under reduced conditions, however, an immiscible secondary phase formed in the melt and impaired processing. This phase, identified as calcium and rare-earth phosphates, was controlled bymore » minimizing calcium and rare-earth levels in the glass composition, increasing the alkali content of the glass, and decreasing the reductants. The inorganic ion exchanger used in decontaminating the PUREX supernatant was successfully incorporated in the glass at a 10-wt % level with minimal impacts on processing. Limited test results suggested that zeolites at levels as high as 20 wt % in the glass could be incorporated with high-sodium sulfate-containing feed. Slurry rheological problems were solved by adjusting the pH of the waste feed and grinding the zeolite.« less" @default.
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- W61219554 date "1986-06-01" @default.
- W61219554 modified "2023-09-26" @default.
- W61219554 title "Selection of a feed composition for the West Valley Demonstration Project slurry-fed melter" @default.
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