In the stepwise preparation of pure calcium carbonate from limestone,the step referred to as calcination involves:

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Calcination is the process of heating a substance to a high temperature in the absence or limited supply of air or oxygen, to decompose it or transform it into another substance. In the stepwise preparation of pure calcium carbonate from limestone, calcination involves heating calcium carbonate (limestone) to a high temperature (around 900-1000°C) in a kiln, which results in the thermal decomposition of calcium carbonate to calcium oxide (quicklime) and carbon dioxide gas: 
CaCO3 (limestone) → CaO (quicklime) + CO2

In the Stepwise Preparation of Pure Calcium Carbonate from Limestone,the