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What is the role of Limestone in the ext...

What is the role of Limestone in the extraction of Iron from its oxide `Fe_(2)O_(3)` ?

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In this extraction, a basic flux, limestone (CaO) is used, since the gangue present in the ore is silica is which acidic in nature. The limestone combines with it to form calcium silicate (slag)
`underset("flux")(CaO_((s))) + underset("Gangue")(SiO_(2(s))) rarr underset("Slag")(CaSiO_(3(s)))`
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