Question

differentiate between roasting and calcination by giving chemical equation for each

Answer 1

Roasting takes place in presence of air
Calcination tales place in absence of air
2ZnS+3O2 》2ZnO+2SO2(roasting)
ZnCO3》FeO+CO2(calcination)

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 !!