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Differentiate between roasting and Calcination. 

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Calcination:

(i) it involves heating of the ore in the absence of air 

(ii) it is generally used for carbonate ores 

Calcination: 

ZnCO→ ZnO(s) + CO2

Roasting: 

(i) it involves the heating of the ore in the presence of air 

(ii) it is generally used for sulphide ores

Roasting: 

2ZnS + 3O22ZnO + 2SO2

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