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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_2overset(Delta)toCu_2S+2Fes+SO_2`
`2Cu_2S+3O_2to2Cu_2O+3SO_2`
`2FeS+3O_2to2FeO+2SO_2`
Smelting:
`FeO+SiO_2toFeSiO_3` (Slag)
`Cu_2O+FeStoCu_2S+FeO`
Bessemerisation:
`Cu_2S+2Cu_2Oto6Cu+SO_2`
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