Differentiate between roasting and Calcination.

1.	Differentiate between roasting and Calcination.
Answer» Calcination: (i) it involves heating of the ore in the absence of air (ii) it is generally used for carbonate ores Calcination: ZnCO₃→ ZnO(s) + CO₂ Roasting: (i) it involves the heating of the ore in the presence of air (ii) it is generally used for sulphide ores Roasting: 2ZnS + 3O₂→2ZnO + 2SO₂

Answer»

Calcination:

(i) it involves heating of the ore in the absence of air

(ii) it is generally used for carbonate ores

Calcination:

ZnCO₃→ ZnO(s) + CO₂

Roasting:

(i) it involves the heating of the ore in the presence of air

(ii) it is generally used for sulphide ores

Roasting:

2ZnS + 3O₂→2ZnO + 2SO₂

Discussion