# 6.9 State the role of silica in the metallurgy of copper.

The role of silica in metallurgy of copper is to remove the $FeO$ (iron oxide) produced during roasting as slag. If the sulphide ore contains iron, it mixed with silica ($SiO_{2}$) as flux before heating.  $FeO$ combines with silica and produce iron silicate ($FeSiO_{3}$
$FeO+SiO_{2}\rightarrow FeSiO_{3}(slag)$