Impure metals can generate
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In metallurgy, refining consists of purifying an impure metal. It is to be distinguished from other processes such as smelting and calcining in that those two involve a chemical change to the raw material, whereas in refining, the final material is usually identical chemically to the original one, only it is purer.
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Many metals like
> copper, > zinc, > tin, > lead, > nickel, > silver, > gold
are refined electrolytically
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