PUC Karnataka Science Class 12Department of Pre-University Education, Karnataka
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Write down the reactions taking place in different zones in the blast furnace during the extraction of iron. - PUC Karnataka Science Class 12 - Chemistry

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Question

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

Solution

During the extraction of iron, the reduction of iron oxides takes place in the blast furnace. In this process, hot air is blown from the bottom of the furnace and coke is burnt to raise the temperature up to 2200 K 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 (500 − 800 K) in the blast furnace are:

3Fe2O3 + CO2Fe3O4 + CO2

Fe3O4 + 4CO  3Fe + 4CO2

Fe2O3 + CO  2FeO + CO2

The reactions taking place in the higher temperature range (900 − 1500 K) in the blast furnace are:

`C + CO_2  -> 2CO`

`FeO+CO -> Fe+ CO_2`

The silicate impurity of the ore is removed as slag by calcium oxide (CaO), which is formed by the decomposition of limestone (CaCO3)

`CaCO_3 -> Cao + CO_2`

`CaO + SiO_2 -> CaSiO_3`

                          Calcium silicate

                          (Slag)

 

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APPEARS IN

 NCERT Solution for Chemistry Textbook for Class 12 (2015 to Current)
Chapter 6: General Principles and Processes of Isolation of Elements
Q: 7 | Page no. 163
Solution Write down the reactions taking place in different zones in the blast furnace during the extraction of iron. Concept: Application of Thermodynamic Principles of Metallurgy.
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