The main reactions occuring in blast furnace during extraction of iron from haematite ore…..

Options

A. ` Fe _ 2 O _ 3 + CO to 2 Fe + 3 CO _ 2 `
B. ` Fe O + Si O _ 2 to FeSiO _ 2 `
C. `Fe _ 2 O _ 3 + 3C to 2Fe + 3CO `
D. `CaO + Si O _ 2 to CaSiO _ 3 `

Answer

A, D

Explanation

` Fe_2 O _ 3 + 3 C to 2 Fe + 3 CO ` reaction does occur in the blast furnace at temperatures above 1123 K when almost all the ` Fe _ 2 O _ 3 ` has already been reduced to Fe. Therefore, it is not the main reaction. Further, ` Ca CO _ 3 ` decomposes around 1123 K to give CaO. Since, below this temperature, FeO has already been reduced to Fe, therefore , ` SiO _ 2` does not combine with FeO to form ` FeSiO _ 3 ` slag. Thus, the main reactions which occur in the blast furnace are (a) and (d).