Mr 10 Departure Betwixt Roasting As Well As Calcination
Roasting is the procedure inward which the ore is heated below its melting betoken inward presence of air to oxidise the impurities. eg: carbon, sulphur etc removed equally their gaseous oxides. Calcination is the procedure of heating the ore below its melting betoken an absence of air to take volatile impurities similar arsenic etc. Roasting vs Calcination Roasting Calcination One is heated inward the presence of excess of oxygen or air. 1 is heated inward the absence or express render of oxygen or air This method is employed for sulphide ores. This method is employed for carbonate ores. Sulphur dioxide is produced along amongst metallic oxide. Carbon dioxide is produced along amongst metallic oxide. Example: For the ores ZnS (sphalerite) in addition to Cu 2 S (chalcocite), balanced equations for the roasting are: 2ZnS+3O2-->2 Zno+ 2SO2 2 Cu 2 S + 3 O 2 → two Cu 2 O + two SO 2 Example: ZnCO3--> ZnO+ C02