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After iron and slag are produced in blast furnace ironmaking, why is pig iron discharged below and slag discharged above?
Why is the pig iron outlet lower than the slag outlet?

Because the density of pig iron in molten state is greater than that of slag.

Analysis: Slag is generally lighter than molten pig iron and floats on it, so slag is removed from it.

The density of molten pig iron is higher than that of slag, so molten pig iron comes out from below.

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