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What is the role of silica in the metall...

What is the role of silica in the metallurgy of copper?

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Copper is extracted from copper matte which contains iron as impurity. Silica is added to remove this impurity as iron silica in the form of fusible slag.
`underset("Impurity")(FeO) + SiO_(2) to underset("(slag)")(underset("Iron silicate")(FeSiO_(3)))`
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