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Question:

why is coke/carbon important in a blast furnace?

is it because the coke is more reactive than the iron ore and limestone that is also used in the limestone.?

Answer:

Yes this is a terrible site
No, it depends of what kind of magnet it is.
Maybe, but i got an earth magnet the size of a quarter that can lift like 5 pounds or something.
in iron smelting, carbon is important to make iron into steel. The carbon bonds and hardens the final product by reducing mirco-crystalline fractures in the iron. So steel is about .5-2% carbon. usually 10-15% nickel or chromium depending on whether it's stainless steel and the rest is iron.
Coke (carbon) is a reducing agent, and combines with the oxygen in the iron ore, producing carbon dioxide and releasing the iron. The limestone (calcium carbonate) is used as a flux to combine with the silicate impurities to form calcium silicate slag; which floats to the surface.

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