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Example - Limestone of 84 CaCO 3 8 MgCO 3 8 H 2 O is calcined in a rotary kiln. Gaseous fuel is combusted with stoichiometric air to supply the required heat. The limestone fuel and air are supplied at 298 K lime is discharged at 1173 K and gases leave at 473 K. Calculate the energy required to calcine 1000 kg of limestone. Reactions CaCO 3.