Question

1)What is roasting?
2)What is calcination?

Answer 1

Answer:

Roasting is a process of heating of sulfide ore to a high temperature in presence of air.

calcination is also used to mean a thermal treatment process in the absence or limited supply of air or oxygen applied to ores and other solid materials to bring about a thermal decomposition.

I hope it will help you

Answer 2

rostaing; It is a process in which ore is heated below it's melting point in presence of air to oxidise impurities .

Calcination : it is a process of heating ore below melting point in absence of air to remove volatile impurities.