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cupellation |
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cupellationSeparation of gold or silver from impurities by melting the impure metal in a cupel (a flat, porous dish made of a refractory material) and directing a blast of hot air on it in a special furnace. The impurities, including lead, copper, tin, and other unwanted metals, are oxidized and partly vaporized and partly absorbed into the pores of the cupel. cupellation [‚kyü·pə′lā·shən] (metallurgy) Method using a cupel for assaying precious metals. Process for refining gold and silver by alloying them with lead and then oxidizing the molten lead to separate the base metal from the precious metal. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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