Steel production: a worker taking the 'slag' from the top of a charge of iron in an open hearth blast furnace. The slag forms as impurities from the raw material and rises to the top of the molten metal in the furnace. The blast furnace produces iron for use in steel production. Iron ore, coke and limestone are added at the top of the furnace, and the molten iron and slag collects in the hearth. Slag and iron are tapped at intervals, as the furnace runs continuously.
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