Abstract
Selenite was boiled in KCl solutions of different concentrations at the respective boiling temperatures and atmospheric pressure. The products were subjected to X-ray diffraction analysis, qualitative infrared analysis, differential thermal analysis and microscopic examination. The product obtained in 1.0 M KCl solution was the β-form of calcium sulphate hemihydrate (α-CaSO4·0.5H2O). In more concentrated KCl solution (1.5, 2.0, 2.5, 3.0, 3.5 or 4.0 M), the α-form of calcium sulphate hemihydrate (α-CaSO4·0.5H2O) was formed, and a reaction took place between KCl and CaSO4, which gave a double salt: potassium pentacalcium sulphate monohydrate (K2SO4·5CaSO4·H2O).
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Marinković, S., Kostić-Pulek, A., Durić, S. et al. Products of Hydrothermal Treatment of Selenite in Potassium Chloride Solutions. Journal of Thermal Analysis and Calorimetry 57, 559–567 (1999). https://doi.org/10.1023/A:1010136612578
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DOI: https://doi.org/10.1023/A:1010136612578