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Wrought iron is the purest form of iron....

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?

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(i) `underset("Haematite lining")(Fe_(2)O_(3)) + underset("(present in cast iron)")(underset("impurities")(3C)) to underset("Wrought iron")(2Fe)+3CO`
This reaction takes place in reverberatory furnace lined with haematite.
(ii) The haematite oxidises S to `SO_(2)`, Si to `SiO_(2)` and P to `P_(4)O_(10)` . 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.
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