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Write balanced equations for "the extrac...

Write balanced equations for "the extraction of copper from pyrites by self-reduction".

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Roasting :
`2CuFeS_(2)+O_(2) overset (Delta) rar Cu_(2)S +2FeS +SO_(2)`
`2Cu_(2)S+3O_(2) rarr 2Cu_(2)O +3SO_(2)`
`2FeS +3O_(2) rarr 2FeO +2SO_(2)`
Smelting :
`FeO + SiO_(2) rarr FeSiO_(3) (Slag)`
`Cu_(2)O + FeS rarr Cu_(2)S + FeO`
Bessemerisation :
Self-reduction
`Cu_(2)S + 2Cu_(2)O rarr 6Cu + SO_(2)`.
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