DAVID GUYON / SCIENCE PHOTO LIBRARY DAVID GUYON / SCIENCE PHOTO LIBRARY
Blast furnace. Time exposure photograph of a blast furnace in a steel foundry. In such a furnace, iron ore, coke and limestone are added to the furnace, and then subjected to blasts of heated air. Impurities are burnt off or converted to an insoluble slag which can then be skimmed off the surface of the molten metal.
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