Question

what is the difference between calcination and roasting

Answer 1

Calcination:-The process of calcining - heating a substance to a high temperature, but below its melting point, to bring about thermal decomposition.

Roast:-To heat to excess; to heat violently; to burn.

Answer 2

roasting
it is the process of removing impurities by heating it below it's melting point in presence of air
calcination
it is the process of removing the impurity by
heating it below it's melting point in the absence of air to remove volatile impurities