DAVID HAY JONES / SCIENCE PHOTO LIBRARY DAVID HAY JONES / SCIENCE PHOTO LIBRARY
Steel works. Molten slag being poured into a slag dump at a steel works. Slag is a waste product of pig iron production. An early stage in the production of steel. Slag contains silicates and oxides and solidifies on cooling. Photographed at the Mittal Steel USA plant in Indiana Harbour, Indiana, USA.
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