Question
Compare roasting and calcination.
| 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. | In this method, carbonate ores decompose to form metal oxide. |
| E.g. 2ZnS+3O_(2)longrightarrow2ZnO+2SO_(2)uarr | E.g.ZnCO_(3)longrightarrow ZnO+CO_(2)uarr |
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