Write down the reactions taking place in different zones in the blast furnace during the extraction of iron.
Write down the reactions taking place in different zones in the blast furnace during the extraction of iron.

Solution 7:
In the blast furnace reduction of iron oxides take place at different temperature ranges as shown below. At 500-800 \mathrm{~K}

    \[\begin{array}{l} 3 \mathrm{Fe}_{2} \mathrm{O}_{3}+\mathrm{CO} \longrightarrow 2 \mathrm{Fe}_{3} \mathrm{O}_{4}+\mathrm{CO}_{2} \\ \mathrm{Fe}_{2} \mathrm{O}_{3}+4 \mathrm{CO} \longrightarrow 3 \mathrm{Fe}+4 \mathrm{CO}_{2} \\ \mathrm{Fe}_{2} \mathrm{O}_{3}+\mathrm{CO} \longrightarrow 2 \mathrm{Fe}+\mathrm{CO}_{2} \\ \mathrm{At} 900-1500 \mathrm{~K} \\ \mathrm{C}+\mathrm{CO}_{2} \longrightarrow 2 \mathrm{CO} \\ \mathrm{FeO}+\mathrm{CO} \longrightarrow \mathrm{Fe}+\mathrm{CO}_{2} \\ \mathrm{C}+\mathrm{O}_{2} \longrightarrow \mathrm{CO}_{2} \end{array}\]

    \[\begin{array}{l} \hline \mathrm{FeO}+\mathrm{C} \longrightarrow \mathrm{Fe}+\mathrm{CO} \\ \mathrm{CaCO}_{3} \stackrel{\Delta}{\longrightarrow} \mathrm{CaO}+\mathrm{CO}_{2} \\ \mathrm{CaO}+\mathrm{SiO}_{2} \longrightarrow \mathrm{CaSiO}_{2}(\mathrm{Slag}) \end{array}\]