# 6.17 Why copper matte is put in silica lined converter?

The copper matte composed of $Cu_{2}S$ and $FeS$. It is put in a silica-lined converter to remove the remaining ferrous oxide ($FeO$) and ferrous sulphide ($FeS$) present in copper matte as slag ($FeSiO_{3}$)
Some silica is also added and hot air blast is blown to convert the remaining $(FeS,FeO \&\ Cu_{2}S/Cu_{2}O)$ to the metallic copper.
$\\2FeS+3O_{2}\rightarrow 2FeO+2SO_{2}\\ FeO+SiO_{2}\rightarrow FeSiO_{3}\\ 2Cu_{2}S+3O_{2}\rightarrow 2Cu_{2}O+2SO_{2}\\ 2CU_{2}O+Cu_{2}S\rightarrow 6Cu+SO_{2}$