Thermal Dehydration of Calcium Hydroxide. 2. Surface Area Evolution

TLDR: The evolution of the specific surface area associated with the thermal decomposition of calcium hydroxide has been studied experimentally and described by kinetic models utilizing two different solids as discussed by the authors.

Abstract: The evolution of the specific surface area associated with the thermal decomposition of calcium hydroxide has been studied experimentally and described by kinetic models utilizing two different solids: commercial calcium hydroxide (So = 83 m2g-') and calcium hydroxide reagent (So = 187 m2g-') The surface area was observed to vary linearly with the fraction decomposed during the dehydration period Sintering phenomena have been experimentally measured by treating calcium oxide samples (So = 46 m2g-'), obtained after dehydration of calcium hydroxide under constant conditions, at temperatures in the range 500-900 "C for periods of time up to 24 h A previously developed model, German and Munir (1976), fits the experimental results well if the surface area decreases to less than 55% of the initial value An empirical kinetic model, where the surface area is linearly related to the heating time, correlates the experimental data, when AS/So L 55% Simulated curves using the obtained kinetic models and parameters, for the specific surface during dehydration and sintering, agree well within the experimental results