Question

Silica is added to sulphide ore of copper in reverberatory furnace because:

• A. sulphide ore of copper contains iron as impurity which is removed as iron slag
• B. silica reacts with $C{u}_{2}O$ to form slag
• C. silica helps in reduction of $C{u}_{2}O$ to $Cu$
• D. sulphide ore of copper is separated from iron by reacting with silica

Answer 1

The correct option is A sulphide ore of copper contains iron as impurity which is removed as iron slag

$Si{O}_2$ (Silica) is a flux material. It removes impurities as slag. Here slag consists of Iron in Sulphide ore of $Cu$. here impurity is $FeO$.

$FeO+Si{O}_2\to FeSi{O}_3$