What is the difference between roasting and calcination
??
At least 2
aarshisahu:
in roasting ore is heated in the presence of excess of oxygen
and in calcinaation in the absence of oxygen
roasting is employed for sulphide ores and calcinaation is employed for carbonate ores
exp of roasting is zns plus oxygen
thanks
Answers
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Roasting means the process of heating of ore in presence of oxygen is called roasting This method is suitable for sulphide ores. Calcination means the process of heating of the ore in absence of air is called calcination. This method is suitable for carbonated ores.
Answered by
1
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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