smelting
Definition
Metal extraction process in which an ore (usually mixed with purifying and/or heat generating substances such as limestone and coke) is heated at high temperature in an enclosed furnace. After a reducing reaction (see reduction), lighter ore-components (impurities called slag or tailing) rise to the top and float on the molten metal. Smelting is opposite of roasting which involves an oxidizing reaction (see oxidation).
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