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Why is sulphide ore of copper heated in ...

Why is sulphide ore of copper heated in a furnace afer mixing with silica?

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Silica (flux) being and acidic flux removes the impurities of iron oxide the basic impurity, bu reacting with it. Thus, iron silica (slag) is formed .
` underset("Gangue")(FeO)+ underset("Flux")(SiO_(2)) to underset("Slag")(FeSiO_(3))`
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