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Which process is used in smelting during metallurgy of copper?
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$\mathrm{FeS}$ is converted into $\mathrm{FeO}$
Smelting of $\mathrm{Cu}$ results in slag formation and matte formation.
$\begin{aligned} \mathrm{FeS}+\mathrm{Cu}_2 \mathrm{O} \rightarrow & \mathrm{FeO}+\mathrm{Cu}_2 \mathrm{~S} \\ \mathrm{FeO}+\mathrm{SiO}_2 \rightarrow & \mathrm{FeSiO}_3 \\ & \text { (slag) }\end{aligned}$
$\begin{aligned} \mathrm{FeS}+\mathrm{Cu}_2 \mathrm{O} \rightarrow & \mathrm{FeO}+\mathrm{Cu}_2 \mathrm{~S} \\ \mathrm{FeO}+\mathrm{SiO}_2 \rightarrow & \mathrm{FeSiO}_3 \\ & \text { (slag) }\end{aligned}$
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