Heating of carbonate ores to remove carbon is called as:

Calcination is a process in which the ore is heated strongly in the absence of air.(i) It removes the volatile impurities such as CO2, SO2, organic matter, moisture from the ore.(ii) It removes water from the hydrated ore.(iii) It removes carbon as CO2 from a carbonate ore.CaCO3⟶ΔCaO+CO2 Limestone