Question
Calcination and Roasting
| Calcination | Roasting |
| (i) The process by which carbonate ores are first converted into oxides is called calcination. | (i) The process by which sulphide ores are converted into oxides is called Roasting. |
| (ii) In this process, the ore is strongly heated in a limited supply of air. | (ii) In this process, ore is strongly heated in air |
| (iii) During calcination $CO _2$ is evolved. | (iii) During roasting $SO _2$ is evolved. |
| (iv) Example : $ZnCO _3 \rightarrow ZnO + CO _2 \uparrow$ | (iv) Example : $2 ZnS +3 O _2 \rightarrow 2 ZnO +2 SO _2$ |
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