Question

what is calcination. and. roasting

Answer 1

#Calcination
Process of heating the ore in the absence of air is called calcination .This process removes organic matter and moisture from the ores


#Roasting
Process of heating the ore in the presence of oxygen is called roasting

Answer 2

• Calcination: This is the method used to retain carbonate ores by burning in limited air.

ZnCO3—>ZnO+ CO2

• Roasting: This is the method used to retain sulphide ores by burning in excess air.

ZnSO4—>ZnO+SO2