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Asked by Geeta Last Modified
Answer 
Charlie
During the extraction of iron, the reduction of iron oxides takes place in the blast furnace. In the process, h(o)t air is blown from the bottom of the furnace and coke is burnt to raise the temperature up to 2200K in the lower portion itself. The temperature is lower in the upper part. Thus, it is the lower part where the reduction of iron oxides (Fe2O3 and Fe3O4) takes place.
The reactions taking place in the lower temperature range (500K – 800K ) in the blast furnace are:-
3 Fe2O3 + CO → 2 Fe3O4 + CO2
Fe3O4 + 4 CO → 3 Fe + 4 CO2
Fe2O3 + CO → 2 Fe3 + CO2
The reactions taking place in the higher temperature range ( 900 – 1500K ) in the blast furnace are:-
C + CO2→ 2 CO
FeO + CO → Fe + CO2
The silicate impurity of the ore is removed as a slag by calcium oxide ( CaO), which is formed by the decomposition of limestone (CaCO3).
CaCO3→ CaO + CO2
CaO + SiO2→ CaSiO3 (Calcium silicate/ slag)
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