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

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

Grade:12

1 Answers

Chhavi Jain
92 Points
6 years ago
 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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