Write Down the Reaction Taking Place in Blast Furnace Related to the Metallurgy of Iron in the Temperature Rnge 500 K – 800 K. What is the Role of Limestone in the Metallurgy of Iron? - Chemistry

Sum

Write down the reaction taking place in blast furnace related to the metallurgy of iron in the temperature rnge 500 K – 800 K. What is the role of limestone in the metallurgy of iron?

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Solution

Reaction in blast firnace during metallurgy of Fe at 500 K – 800 K involves.
3Fe₂O₃ + CO → 2Fe₃O₄ + CO₂3Fe2O₄ + 4CO → 3Fe + 4CO₂Fe₂O₄ + CO → 2FeO + CO₂
Reduction of iron oxides takes place. Limestone is added, during metallurgy as it decomposes to CaO at high temperature in funace.
\[\ce{ CaCO3{(s)} ->[\Delta]} CaO(s) + CO{2(g)}\]
Calcium oxide removes silicate impurity of ore as slag. Slag in molten state floats on molten iron metal, hence can be easily removed.