Difference between calcination and roasting 4 points?

1.	Difference between calcination and roasting 4 points?
Answer» Calcination: Conversion of metals into their oxides at high temperature in absence of air (or) limited supply of air is called calcination.Carbonates, bicarbonate ores are subjected to calcination process.Ex: ZnCO3 → ZnO + CO2Roasting: Conversion of metals into their oxides in presence of air is called roasting.Sulphide ores are subjected to roasting process.Ex: 2ZnS + 3O2 → 2ZnO + 2SO2

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