Question

Difference between roasting and calcination

Answer 1

Roasting is the process in which sulphide ore is heated in excess oxygen, below melting point

Calcination is the process in which carbonates is heated in absence or limited oxygen, below melting point

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 !!