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State the role of silica in the metallurgy of copper.

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The roasted ore is mixed with coke and silica (sand) SiO2 and is introduced in to a blast furnace .The hot air is blasted and FeO is converted in to ferrous silicate (FeSiO3)
`Cu_(2)+FeSrarrCu_(2)S+FeO`
`FeO+SiO_(2)rarrFeSiO_(3)`
`FeSiO_(3)` (slag) floats over the moltern matter of copper

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