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Question

In metallurgy of iron, when limestone is added to the blast furnace, the calcium ends up in:


A

gangue

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B

metallic calcium

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C

calcium carbonate

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D

slag

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Solution

The correct option is D

slag


CaCO3ΔCaO+CO2

The coke further reacts with this carbon dioxide to form carbon monoxide:
CO2+C2CO

Reduction:
Fe2O3+3C2Fe+2CO

The CaO from the added limestome (calcium carbonate) reacts with silica forming slag:
CaO+SiO2CaSiO3


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