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Explain the following (i) Chalcocite i...

Explain the following
`(i)` Chalcocite is roasted and not calcined during recovery of copper.
`(ii)` Magnesium oxide is used for lining in steel making furnace

Text Solution

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`(i)` Chalcocite being a sulphide ore of copper needs roasting (heating in excess of air) and not calcination.
`(ii)` Basic lining of magnesia `(MgO)` is used to remove the acidic impurities such as `P_(4)O_(10)` and `SO_(2)`.
`MgO+SO_(2)toMgSO_(3)`
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