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  • The purest form of iron is prepared by oxidising impurities from cast iron in a reverberatory furnace. Which iron ore is used to line the furnace? Explain by giving a reaction.

The purest form of iron is prepared by oxidising impurities from cast iron in a reverberatory furnace. Which iron ore is used to line the furnace? Explain by giving a reaction.

 

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Haematite (Fe_{2}O_{3}) is used to line the furnace. It supplies the oxygen and oxidises impurities present in the cast iron like carbon, silicon, manganese and phosphorus to CO, SiO_{2}, MnO and P_{2}O_{5}.

Fe_{2}O_{3}+3C\overset{Heat}{\rightarrow}2Fe+3CO

                                                        3Si+2Fe_{2} O_3\rightarrow 4Fe+3SiO_2

                                                        3S+2Fe_2 O_3\rightarrow 3SO_2+4Fe

 CO and SO_{2} escape and MnO \; and\; SiO_{2}  combine to form to form manganous silicate (MnSiO_{3}) as slag MnO+SiO_{2}\overset{Heat}{\rightarrow}MnSiO_{3} (Manganous silicate-slag)

 

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