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- W2340463578 abstract "The static leaching behavior of seven formulations of SYNROC and two preparations of hollandite have been investigated under hydrothermal conditions. Each formulation was tested at several times (1 to 60 days) and temperatures (150 to 610/sup 0/C) at 100-MPa water pressure, using distilled water as the fluid. Both cored and powdered samples were employed in the hydrothermal experiments. Leach rates (g SYNROC/m/sup 2/ day) were calculated on the basis of element concentrations observed in the leachate. Postrun SEM and XRD observations of some core specimens revealed crystalline precipitates occurring on core surfaces, which are interpreted to be metastable phases and/or precipitates that were formed during quenching. As a result, calculated leach rates based on some elements in the fluid phase are not true leach rates. The temperature dependence of apparent leach rate was erratic. The time dependence of apparent leach rate was consistent and well defined for all SYNROC formulations; it decreased as a function of time. Analysis of hydrothermal results suggests that runs of 30 to 60 days are required to approach, or to attain, steady-state apparent leach rates. Sample form appears to have a demonstrable effect on leaching behavior. For comparable run conditions, powders generally have lower apparent leach rates but have a higher percentage of material leached than cores. The mineral hollandite appears to be very resistant to hydrothermal leaching, with only titanium found in the leachate." @default.
- W2340463578 created "2016-06-24" @default.
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- W2340463578 date "1980-12-01" @default.
- W2340463578 modified "2023-09-23" @default.
- W2340463578 title "Hydrothermal investigation of SYNROC formulations from 150/sup 0/ to 610/sup 0/ at 100-MPa water pressure" @default.
- W2340463578 doi "https://doi.org/10.2172/6393234" @default.
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