Differentiate between cacination and roasti g.give 5 points

1.	Differentiate between cacination and roasti g.give 5 points
Answer» Roasting vs CalcinationRoastingCalcinationOne is heated in the presence of excess of oxygen or air.\tone is heated in the absence or limited supply of oxygen or airThis method is employed for sulphide ores.\tThis method is employed for carbonate ores.Sulphur dioxide is produced along with metal oxide.\tCarbon 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+ 2SO22 Cu2S + 3O2 → 2 Cu2O + 2 SO2Example: ZnCO3--> ZnO+ C02

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