Essential Chemistry for IGCSE - Metal Extraction (Section 5 - No. 21)
What is the primary purpose of limestone (calcium carbonate) in the blast furnace?
To react with the iron ore directly.
To remove impurities.
To act as a fuel.
To produce carbon monoxide.
Explanation
Limestone removes impurities (like silica/sand) from the iron ore in the blast furnace.
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