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Discuss the process of roasting with sui...

Discuss the process of roasting with suitable example.

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Sulphide ores are generally roasted in reverberatory furnace in free supply of air below its melting point. Ore changes to oxide with larger surface area and volatile impurities are removed.
`2ZnS + 3O_(2) overset(Delta)rarr 2ZnO + 2SO_(2)`
`2PbS + 3O_(2) overset(Delta)rarr PbO + 2SO_(2)`
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