in making aluminium in a arc furnace why is the arc current DC and not AC?
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Aluminum is not made in an arc furnaceIt is made in a smelterSmelting is a totally different processAn arc furnace is used to make steel by melting scrap, and possibly iron oreThe arc generates heat to melt the materialMost arc furnaces are ACA smelter performs an electrolytic processThis process involves the migration of electrons in the atoms of the material fed into the smelter - heat is a byproduct, but the process is not fundamentally thermalIn order to force migration of electrons, smelters must be DC.
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