Ceramics-Silikáty 41 (4) 121-123 (1997)

HYDRATION KINETICS OF MAGNESIUM OXIDE, PART 3 - HYDRATION RATE OF MgO IN TERMS OF TEMPERATURE AND TIME OF ITS FIRING

M. Maryška, J. Bláha

The rate of hydration of magnesium oxide depends on the temperature and time of its firing. To describe the kinetics of hydration over the entire temperature range measured, use can be made of the equation ln(1/(1 - a) = (kt)ⁿ, which was proposed for similar heterogeneous systems by Yerofeyev. The temperature dependence of rate constants conforms to the Arrhenius equation. The activation energy also depends on temperature and the time of firing of MgO, and its values range from 50 to 93 kJ mol-1.

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