Write a note on wrought iron.

(N/A) Wrought iron is the purest form of commercial iron and is prepared from cast iron by oxidizing impurities in a reverberatory furnace lined with haematite $(Fe_2O_3)$.
The haematite oxidizes carbon to carbon monoxide:
$Fe_2O_3 + 3C \rightarrow 2Fe + 3CO$
Limestone is added as a flux,and impurities like sulfur,silicon,and phosphorus are oxidized and passed into the slag.
Finally,the metal is removed from the furnace and passed through rollers to remove the slag,yielding pure wrought iron.