Question

what is calcination and what is roasting

Answer 1

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here is your answer :

Calcination: Reduction of Carbonate ores into oxides .

Roasting :Reduction of sulphide ores into oxides.

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Answer 2

Calcination :- Calcination is a process for concentration of Carbonate ore. It involves heating of Carbonate ore in  absence of Oxygen. In this process CO₂ is released and metal is obtained.

For Ex :- ZnCO₃ ⇒ ZnO + CO₂

Roasting :- Roasting is a process for concentration of Sulphide Ore. It involves heating of Sulphide ore in presence of oxygen. In this process SO₂ gas is released and metal oxide is obtained.

Ex :- ZnS + O₂ ⇒ ZnO + SO₂

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