Question

Difference between roasting and calcination???

Answer 1

Roastlng is a pyrochemical process in which the ore is heated in the presence of oxygen or air is below its melting point the products like metal oxide and sulphide ore etc obtained are in solid state roastlng is done in rever berotory furnance

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 !!