Ore can melt, so impurities float on top and pure metal sinks to bottom {smelter}|.
Furnaces {Bessemer converter} {open-hearth furnace} can use air to burn impurities out of iron ore to make steel {steel making}|. Steel-making furnaces can use pure oxygen gas, instead of air, to burn impurities out of iron ore {L-D process} {basic oxygen process}.
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Date Modified: 2022.0225