Question

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?

Answer 1

Fe₂O₃ + 3C → 2Fe + 3CO

Limestone is added as flux and sulphur, silicon and phosphorus change to their oxides and pass into the slag.