Cupellation

Cupellation is a refining process in metallurgy, where ores or alloyed metals are treated under high temperatures and controlled operations to separate noble metals, like gold and silver, from base metals like lead, copper, zinc, arsenic, antimony or bismuth, present in the ore. The process is based on the principle that precious metals do not oxi...
Found on http://en.wikipedia.org/wiki/Cupellation

Cupellation

• (n.) The act or process of refining gold or silver, etc., in a cupel.
Found on http://thinkexist.com/dictionary/meaning/cupellation/

Cupellation

Cu`pel¬∑la'tion (kū`pĕl*lā'shŭn) noun [ See Cupel .] The act or process of refining gold or silver, etc., in a cupel. » The process consist in exposing the cupel containing the metal to be assayed or refined to a hot blast, by which the lead, copper, tin, etc., are...
Found on http://www.encyclo.co.uk/webster/C/203

Cupellation

An assaying or refining process whereby the components of an alloy oxidised at high temperature are separated by absorbtion into the walls of a 'cupel', a shallow porous vessel.
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Cupellation

Cupellation is an ancient method of extracting silver from its ores by alloying the silver with lead, and then removing the lead from the lead-silver alloy by melting it in a receptacle made from bone-ash and called a cupel. Air is then passed over the surface of the metal, oxidising the lead to litharge which is blown off.
Found on http://www.probertencyclopaedia.com/browse/GC.HTM

Cupellation

Separation of base metals from precious metals by oxidation of the former. The oxides are absorbed by a cupel (a dish of bone ash); the precious metal remains as a bead on the cupel. A technique used in assaying.
Found on http://www.metalbulletin.com/Glossary.html

Cupellation

Separation of base metals from precious metals by oxidation of the former. The oxides are absorbed by a cupel (a dish of bone ash); the precious metal remains as a bead on the cupel. A technique used in assaying.
Found on http://www.metalbulletin.com/Glossary.html

cupellation

separation of gold or silver from impurities by melting the impure metal in a cupel (a flat, porous dish made of a refractory, or ... [3 related articles]
Found on http://www.britannica.com/eb/a-z/c/169
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