What is the Role of Limestone in the Extraction of Iron from Its Oxides?

What is the role of limestone in the extraction of iron from its oxides?

Limestone decomposes to form CaO which reacts with silicate impurity in the blast furnace to form slag.

CaCO₃ → CaO + CO₂

CaO + SiO₂ → CaSiO₃ (slag)

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Q 14 | 3 marks

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(i) \[\ce{CaCo3 -> CaO + CO2}\]

(ii) \[\ce{2FeS2 + 11/2 O2 -> Fe2O3 + 4SO2}\]

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