Question

Write down the reactions taking place in different zones of a blast furnace on the extraction of Fe.

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Answer 1

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 + CO → 2Fe3O4 + CO2

Fe3O4 + 4CO → 3Fe + 4CO2

Fe2O3 + CO → 2Fe3 + CO2

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

C +CO2 → 2CO

FeO + CO → Fe + CO2

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

CaCO3 → CaO + Co2

CaO + SiO2 → CaSiO3

Calcium silicate (Slag)

Answer 2

Answer:

The reactions which are occurred at the lower temperature (500-800k) range are following -

3 Fe 203+CO= 2 Fe 304+302,

Fe 304+4CO= 3 Fe+4co2, Fe 203+ CO=2fe 3+Co2

The reactions which are occurred at the higher temperature (900-1500k) range are following

c+co2= 2co,fe0+CO=Fe+302

The reaction for the removal of impurity are following

Caco3= cao+ co2, cao+ sio2=casio3

Explanation:

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