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Question
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?
Solution
\[\ce{Fe2O3 + 3C -> 2Fe + 3CO}\]
Limestone is added as flux and sulphur, silicon and phosphorus change to their oxides and pass into the slag.
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