Limestone is added in the blast furnace (during pig iron manufacture) to______________________?
Correct answer: A. Form slag by combining with impurities
- A. Form slag by combining with impurities
- B. Supply heat by undergoing exothermic reaction with impurities
- C. Reduce the coke consumption
- D. Reduce slag viscosity
Explanation
Limestone decomposes to lime in the furnace, and the lime combines with silica and other gangue impurities to form slag. It acts as a flux rather than as the main heat source or reducing agent.
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