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Roasting of copper pyrite ores is for th...

Roasting of copper pyrite ores is for the following purpose

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`CuFeS_(2)+O_(2)rarrCu_(2)S+FeO +SO_(2)uarr`
`[Fe_(3)O_(4)+O_(4)rarrFe_(2)O_(3)`,
`FeCO_(3)+O_(2)rarrFe_(2)O_(3)+CO_(2)]`
`FeO` conversion into `Fe_(2)O_(3)` to prevent losss of iron in form of slag `(FeSiO_(3))`
`SnO_(2)+O_(2)rarr` No reaction
`{:(FeS),(Cu_(2)S):}}+O_(2) rarr "sulphate, removed by treating with hot" H_(2)O`
`Pbs + O_(2)rarrPbO+SO_(2)`
`ZnS+O_(2)rarrZnO+SO_(2)`
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