By Team Aakash Byju's
Roasting is the process of heating ore to a temperature below its melting point in the presence of air or oxygen.
Calcination is a process in which ore is heated without the presence of air or with a little supply of air.
The roasting process is mostly used to extract sulfide minerals.
Calcination is the process of removing carbon from limestone through combustion.
Dehydration of ore is not required to carry out the roasting process.
Where as, moisture is taken out of ore during the process of calcination.
A massive amount of poisonous, metallic, and acidic elements are emitted during roasting.
On the other hand, carbon dioxide is released during calcination.
The transformation of zinc sulfide to zinc oxide is an example of roasting.
Decomposition of limestone to lime and carbon dioxide is an example of calcination.