SIMON FRASER / SCIENCE PHOTO LIBRARY SIMON FRASER / SCIENCE PHOTO LIBRARY
Slag heap. Land contaminated by slag heaps from an old sulphuric acid plant, close to a residential area. Slag consists of various waste impurities produced in metallurgical smelting and combustion processes. The smelting of copper, lead and zinc is the basis of sulphur dioxide production in some sulphuric acid plants. Sulphur dioxide and water are the basic materials used in the manufacture of sulphuric acid. Photographed in Bilbao, Spain.
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