what is calcination and roasting
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Calcination - Done for carbonate ores
Roasting - Done for sulphide ores
Calcination - Done in absence of oxygen
Roasting - Done in presence of oxygen
Calcination - co2 is formed
Roasting - So2 is formed
Calcination - eg ZnCo3 - Zno + Co2
Roasting - eg 2HgS +3 O2 - 2HgO +2 So2
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