what is calcination and roasting
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the process heating of carbonate ore in absence of air is called calcination
the process of heating of sulphide ore in presence of excess air is called roasting
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calcination is the heating of carbonate ores in the absence of oxygen.
CaCO3-----> CaO + CO2
roasting is the heating of sulphate ores in the presence of oxygen
ZnS + O2------> ZnO + SO2
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