Grade 12Physical Chemistry
Why limestone is used in the manufacture of pig iron from haematite.
Why limestone is used in the manufacture of pig iron from haematite.
1 Answer
Chhavi Jain
Dear Student
Lime stone ( CaCO3 ) when added to molten iron it decomposes into CO2 and CaO ( also called as quick lime). It is also used as a flux.
CaCO3 ----> CaO + CO2
CaO combines with the impurities of the ore called gangue to form slag like calcium silicates (CaSiO3) and calcium aluminates which floats on the top of the molten iron.
flux + gangue ---> Slag
CaO + SiO2 -----> CaSiO3
CaO + Al2O3 ------> Ca(AlO2)2
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