CROWN COPYRIGHT / HEALTH & SAFETY LABORATORY / SCIENCE PHOTO LIBRARY CROWN COPYRIGHT / HEALTH & SAFETY LABORATORY / SCIENCE PHOTO LIBRARY
Blast furnace. Workers attend to a blast furnace in a steel works. In blast furnaces, heated air is forced through a mixture of iron ore, coke and limestone. Impurities are burnt off or converted to an insoluble slag which can be skimmed off the surface of the molten metal. Photographed at a British Steel plant in Sheffield, Britain, a city famous for its manufacture of steel. CROWN COPYRIGHT UNDER LICENCE FROM THE HEALTH & SAFETY LABORATORY & CONTROLLER OF HER MAJESTY'S STATIONERY OFFICE.
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