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) Fe2O3Haematitelining+3CImpurities(presentincastiron)2FeWroughtiron+3CO
This reaction takes placein reverberatory furnace lined with haematite.
 
(b) The haematite oxidises StoSO2,SitoSiO2, and PtoP4O10. 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.