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2 difference between calcination and roasting |
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Answer» \t Roasting Calcination One is heated in the presence of excess of oxygen or air.one is heated in the absence or limited supply of oxygen or airThis method is employed for sulphide ores.This method is employed for carbonate ores.Sulphur dioxide is produced along with metal oxide.Carbon dioxide is produced along with metal oxide. Example: For the ores ZnS (sphalerite) and Cu2S (chalcocite), balanced equations for the roasting are: 2ZnS+3O2-->2 Zno+ 2SO2 2 Cu2S + 3O2 → 2Cu2O + 2SO2 Example: ZnCO3--> ZnO+ C02 \t
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