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?
Wrought iron is the purest form of commercial iron and is obtained from cast iron by oxidising the impuritiesina reverberatory furnace lined with haematite.
Fe2O3 + 3 C → 2 Fe + 3CO
Limestone is added as flux to remove the impurities of sulphur, silicon and phosphorous. They form a slag which can be easily removed. The metal is removed from the slag by passing through rollers.