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Lime stone is added in the extraction of lead from galena why?
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$\begin{aligned} & \mathrm{CaO}+\mathrm{SiO}_2 \longrightarrow \mathrm{CaSiO}_3 \text { (Slag) } \\ & \mathrm{PbO}+\mathrm{SiO}_2 \longrightarrow \mathrm{PbSiO}_3 \\ & \mathrm{CaO} \text { converts } \mathrm{PbSiO}_3 \text { to } \mathrm{PbO}, \\ & \mathrm{PbSiO}_3+\mathrm{CaO} \longrightarrow \mathrm{PbO}+\mathrm{CaSiO}_3\end{aligned}$
and also prevents the formation of $\mathrm{PbSO}_4$.
and also prevents the formation of $\mathrm{PbSO}_4$.
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