Ncert Exercises & Solutions

Wrought iron is the purest form of iron. Write a reaction used for the preparation of wrought iron from cast iron. How can the impurities of sulphur, silicon and phosphorus be removed from cast iron?

NEETprep Answer:

(a)

\underset{Haematite lining}{{Fe}_{2} O_{3}} + \underset{\underset{(p r e s e n t i n c a s t i r o n)}{Impurities}}{3 C} \to \underset{Wrought iron}{2 Fe} + 3 CO

This reaction takes placein reverberatory furnace lined with haematite.

(b) The haematite oxidises

S to {SO}_{2}

Si to {SiO}_{2}

, and

P to P_{4} O_{10}

. Sometimes limestone is added as flux. impurities of S, Si and P oxidise and pass into slag. The metal is removed and freed from slag by passing through rollers.

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