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Why limestone is used in the manufacture of pig iron from haematite.
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 Chemistry Consultantaskiitians
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