Abstract
The processes of solid-phase interaction between calcium and rare-earth fluorides and ammonium sulfate have been studied. Based on thermogravimetric and X-ray diffraction data, the stages and intermediate products of these processes have been identified. It has been established that the heating of ammonium sulfate in a mixture with calcium and rare-earth fluorides to 400°C leads to the conversion of the latter into sulfates.
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Funding
This study was performed within the state task to the Institute of Chemistry (Far East Branch, Russian Academy of Sciences) (project no. 0265-2019-0002).
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Krysenko, G.F., Epov, D.G., Merkulov, E.B. et al. Studying the Possibility for Defluorination of Calcium and Rare-Earth Fluorides by Ammonium Sulfate. Theor Found Chem Eng 55, 996–1001 (2021). https://doi.org/10.1134/S0040579521320026
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DOI: https://doi.org/10.1134/S0040579521320026