olvls combined chemistry: extraction of iron in blast furnace -- a thread (steps and equations)

first the coke reacts with oxygen from the hot air to form carbon dioxide

C (s) + O2 (g) -> CO2 (g)

then the carbon dioxide rises and reacts with more hot coke to form carbon monoxide

CO2 (g) + C (s) -> 2CO (g)

the carbon monoxide acts as a reducing agent, and reduces iron (III) oxide to form molten iron. the main source of carbon dioxide is also formed as a product
CO (g) + Fe2O3 (s) —> 2Fe (s) + 2CO2 (g)

CLEAN-UP PROCESS:

limestone (calcium carbonate) decomposes in heat to form calcium oxide and carbon dioxide

CaCO3 (s) -> CaO (s) + CO2 (g)

calcium oxide reacts with acidic impurities (sand/SiO2/silicon dioxide) to form molten slag (calcium silicate) so that pure iron can be obtained

CaO (s) + SiO2 (s) -> CaSiO3 (l)

end of thread