What is the difference between roasting and calcination?
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Roasting takes place under the absence of oxygen. Calcination takes place with presence of oxygen. Both are process of decomposition
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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 !!
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