When the ore haematite is burnt in air with coke around 2000 K along with lime, the process not only produces steel but also produces a sililcate slag that is useful in making building materials such as cement. Discuss the same and show through balanced chemical equations.

When the ore haematite is burnt in air with coke around 2000 K along w

1.	When the ore haematite is burnt in air with coke around 2000 K along with lime, the process not only produces steel but also produces a sililcate slag that is useful in making building materials such as cement. Discuss the same and show through balanced chemical equations.
Answer» Solution :First by calcination and roasting, the ferrous oxide is oxidised to FERRIC oxide. Then in blast furnace, smelting is done, where it is reduced to get iron. `4FeO+O_2to2Fe_2O_3` `Fe_2O_3+COto2Fe_2O_4+CO_2` `Fe_2O_3+COto2FeO+CO_2` `FeO+COtoFe+CO_2` In the basic BESSEMER process for the manufacture of steel, the lining of the converter is MADE up of LIME. The SLAG formed consists of `Ca_3(PO_4)_2`. Phosphorous is oxidised to `P_4O_(10)` which react with lime to form slag. `P_4+SO_2toP_40_(10),6CaO+P_4O_(10)to2Ca_3(PO_4)_2`