Ceramics-Silikáty 19, (1) 17 - 21 (1975) |
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| A STUDY OF GYPSUM DEHYDRATION IN AQUEOUS MEDIUM
III. THE EFFECT OF TEMPERATURE ON HEMIHYDRATE CRYSTAL GROWTH FROM GYPSUM-SATURATED SOLUTIONS
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Šatava Vladimír
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Joint Laboratory for Chemistry and Technology of Silicates, Czechoslovak Academy of Sciences and Institute of Chemical Technology, 166 28 Prague, Suchbátarova 1905
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The temperature dependence was investigated of steady state transformation rate of gypsum to hemihydrate within the temperature range of 97 °C to 115 °C in the medium of liquid water. The rate of hemihydrate growth in terms of its weight per unit surface area is described by the equation:
-dm/dt = 1.25×10²¹ × exp(-27 000/RT)×(cD-cH)³,
where cD is the solubility of dihydrate, cH is the solubility of hemihydrate, R is the gas constant, T is absolute temperature.
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