Question

Distinguish between:

Roasting and Calcination.

Answer 1

Roasting:

1. In this process, the ore is heated strongly in the presence of air. 

2. In this process, sulphide ore is converted into metal oxide. 

3. During this process SO₂ is given out.

Calcination:

1. In this process, the ore is heated strongly in the limited supply of air. 

2. In this process, carbonate ore is converted into metal oxide. 

3. During this process CO₂ is given out.