Haematite (Fe2O3), limestone (CaCO3) coke (C) and hot air are added to the blast furnace.
Firstly, the coke reacts with the oxygen in the hot air to produce carbon dioxide.
The carbon dioxide then reacts with the coke to produce carbon monoxide.
The carbon monoxide then reacts with the haematite to form iron and carbon dioxide.
The haematite contains silicon dioxide which is reacted with calcium oxide to form calcium silicate (****.) This floats to the top of the blast furnace where it can be removed.
Adding magnesium reacts with the sulphur impurities, preventing the formation of sulphur dioxide, which causes acid rain to form.
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