Compare roasting and calcination. - Vidyadip

Question

Compare roasting and calcination.

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Answer

	Roasting	Calcination
1.	This method is generally used for sulphide ores	This method is generally used for carbonate ores.
2.	In this method, ores are heated in excess of air.	In this method, ores are heated in a limited supply of air.
3.	In roasting, generally sulphur dioxide gas is evolved.	In calcination, generally carbon dioxide gas is evolved.
4.	In this method, sulphide ores are oxidized to form metal oxides. E.g. $2 ZnS +3 O _2 \longrightarrow 2 ZnO +2 SO _2 \uparrow$	In this method, carbonate ores decompose to form metal oxide. E.g. $ZnCO _3 \longrightarrow ZnO + CO _2 \uparrow$

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