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olvls combined chemistry: extraction of iron in blast furnace -- a thread 
https://abs.twimg.com/emoji/v2/... draggable="false" alt="đ" title="LĂ€chelndes Gesicht mit herzförmigen Augen" aria-label="Emoji: LĂ€chelndes Gesicht mit herzförmigen Augen"> (steps and equations)
first the coke reacts with oxygen from the hot air to form carbon dioxide
C (s) + O2 (g) -> CO2 (g)
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)
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) â> 2Fe (s) + 2CO2 (g)
CO (g) + Fe2O3 (s) â> 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)
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)
CaO (s) + SiO2 (s) -> CaSiO3 (l)
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