Wrought iron is the purest form of iron. Write a reation 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

`Fe_(2)O_(3) +3C rarr 2Fe +3CO`
Limestone is added as flux and sulphur, silicon and phosphours change to their oxides and pass into the slag.