Abstract
The paper presents the results of studies of the effect of water-soluble impurities on the thermal dehydration of phosphogypsum in a self-generated atmosphere, which are obtained by thermogravimetry and differential scanning calorimetry. For comparison, the results of the thermal dehydration of gypsum are given. The information about the change in activation energy depending on the extent of the dehydration and the effect of temperature on the mechanism of the dehydration is obtained by the use of integral isoconversional and model-fitting methods. It has been established that water-soluble impurities have a significant influence on the kinetics of the dehydration. It has been shown that in the thermal dehydration of gypsum an abnormal change in the reaction rate and activation energy is observed. In the dehydration of phosphogypsum, this phenomenon is not observed. This is due to the impact of the water-soluble impurities on the recrystallization of an intermediate amorphous phase during the thermal decomposition.
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