Question

distinguish between roasting and calcination

Answer 1

Roasting is a process of heating the metal ore in sufficient oxygen ...
Calcination is the process of heating metal oxide in insufficient or absence of air
moreover,roasting is done for sulphide ores and calcination is used for carbonates or hydrated ores

Answer 2

In roasting the sulphide ores are converted into oxdies by heating strongly in the presence of excess air this process is called roasting

In calcination the carbon ores changed into oxdies by heating strongly in limited air this process is called calcination