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) Fe2O3Haematite lining+ 3CImpurities(present in cast iron) 2FeWrought iron + 3CO
This reaction takes placein reverberatory furnace lined with haematite.
(b) The haematite oxidises S to SO2,Si to SiO2, and P to P4O10. 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.