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Volatility of sodium, potassium, and cesium perrhenates determined by thermogravimetry

Journal Article · · Journal of Thermal Analysis and Calorimetry

Here, in this study, we investigated the volatility of sodium, potassium, and cesium perrhenates using thermogravimetry (TG) performed on single salts and their binary mixed salts. We performed simultaneous TG and differential scanning calorimetry under a ramp heating condition at 10°C/min up to 1200°C to characterize volatilization behavior as a function of temperature. We also performed isothermal TG over a temperature range of 700 to 975°C to estimate the vapor pressures of the alkali perrhenates based on a modified Langmuir equation that relates the rate of free evaporation from the open surface to vapor pressure. In this paper, we discuss the results of our study on the temperature of evaporation and temperature-dependent vapor pressure of sodium, potassium, and cesium perrhenates in relation to rhenium volatilization behavior observed during melting of simulated waste glass.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1907943
Report Number(s):
PNNL-SA-151081
Journal Information:
Journal of Thermal Analysis and Calorimetry, Journal Name: Journal of Thermal Analysis and Calorimetry Journal Issue: 17 Vol. 147; ISSN 1388-6150
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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