Question

Differentiate between calcination and roasting (with suitable chemical equation).

Answer 1

In both calcination and roasting, an ore is converted into its oxide, albeit through different chemical pathway. ... In the process of roasting concentrated ore is heated strongly, below its melting point, in presence of air with or without some other additives, in order to bring about some desired changes.

Answer 2

Hey !!

ROASTING  

It is the process of heating the ore below its melting point with excess of air.

Sulphide ore are converted into oxide form.  

          2Zns + 3O₂ ---(HEAT)--> 2ZnO + 2SO₂↑

Volatile impurities are removed as oxides SO₂ , As₂O₃ etc.

CALCINATION

It is the process of heating the ore below its melting point in the absence or limited supply of air.

Carbonate ores are converted into oxide

         ZnCO₃ ---(Heat)--> ZnO + CO₂↑

Water and organic impurities are removed.

Hope it helps you !!