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Why is sulphide ore of copper heated in a furnace after mixing with silica?
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Silica (flux) being an acidic flux removes the basic impurities of iron oxide by reacting with it. Thus, iron silicate (slag) is formed.
$$
\underset{\text { Gangue }}{\mathrm{FeO}}+\underset{\text { Flux }}{\mathrm{SiO}_2} \longrightarrow \underset{\text { Slag }}{\mathrm{FeSiO}_3}
$$
$$
\underset{\text { Gangue }}{\mathrm{FeO}}+\underset{\text { Flux }}{\mathrm{SiO}_2} \longrightarrow \underset{\text { Slag }}{\mathrm{FeSiO}_3}
$$
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