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(B) In a modern blast furnace,the charge (or burden) consists of a mixture of calcined iron ore (iron oxides),limestone $(CaCO_3)$,and coke. $1$. The

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Calcined iron oxides + limestone + coke

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(B) In a modern blast furnace,the charge (or burden) consists of a mixture of calcined iron ore (iron oxides),limestone $(CaCO_3)$,and coke. $1$. The iron ore provides the source of iron. $2$. Limestone acts as a flux to remove impurities like silica $(SiO_2)$ by forming slag $(CaSiO_3)$. $3$. Coke acts as both a fuel and a reducing agent to reduce iron oxides to metallic iron.

In the modern blast furnaces,the charge consists of a mixture of

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