Abstract
The heat of dehydroxylation of two kinds of alunite has been obtained by differential thermal analysis (DTA) and differential dynamic calorimetry (DDC). As the values obtained differed for the two kinds of alunite, the influence of silica as a contaminant on the decrease of the heat of dehydroxylation and the temperature of decomposition has been studied. The equations of Claussius-Clapeyron or Van't Hoff should be avoided when deriving the heat of dehydroxylation of alunite because experiments have proved the dehydroxylation to be irreversible.
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