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Why lime stone is added in the extraction of lead from galena ?

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Why lime stone is added in the extraction of lead from galena ?
A. It prevents the formation of `PbSO_4`
B. It remove the impurity of silica as fusible slag
C. It converts lead silicate to lead oxide
D. It remove the impurity of iron oxide as fusible slag
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Correct Answer - A,B,C
CaO converts the `PbSiO_3` to PbO, and also prevents the formation of `PbSO_4`
`CaO+SiO_2toCaSiO_3`(slag), `PbO+SiO_2toPbSiO_3, PbSiO_3 + CaO to PbO + CaSiO_3`
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