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Why are sulphide ores converted to oxide form before reduction to metal? |
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Answer» SOLUTION :(i) Sulphide ores thermodynamically are more stable than `CS_(2)` and hence cannot be converted by using COKE as reducing agent. (ii) Moreover `CO_(2)` is more volatile and thermodynamically more stable than `CS_(2)`. (iii) Thus `DeltaG^(@)` of a metal sulphided is not compensated by the energy of REACTION of metal sulphide with coke. (iv) Hence, it is better to convert the sulphide ORE to OXIDE form and then subject to smelting (i.e) carbon reduction method. |
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