The decomposition of limestone is an endothermic topochemical reaction:
CaCO3 + ΔHR = CaO + CO2
(solid) (reaction enthalpy) (solid) (gaseous)
The calcination process can be explained by using a partially decomposed piece of carbonate [1, 2]. The calcination profiles of CO2 partial pressure and temperature are shown in Figure 1. The specimen comprises a dense carbonate core surrounded by a porous lime layer. In the kiln the combustion gas with the temperature Tg transfers heat by convection (symbolized by α) to the solid surface with the...