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cupellation

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cu·pel·la·tion  (kyp-lshn)
n.
A refining process for nonoxidizing metals, such as silver and gold, in which a metallic mixture is oxidized at high temperatures and base metals are separated by absorption into the walls of a cupel.
cupellation [ˌkjuːpɪˈleɪʃən]
n
1. (Engineering / Metallurgy) the process of recovering precious metals from lead by melting the alloy in a cupel and oxidizing the lead by means of an air blast
2. (Engineering / Metallurgy) the manufacture of lead oxide by melting and oxidizing lead
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This was refined repeatedly by the process of cupellation.
Sterling Silver Jewelry by Margret Rosenthal / Women's issues/gender studies community
We have observed that the unique poly-metallic nature of the El Capitan deposit results in significant slag and/or cupellation losses when using lead collection fire assay, and the oxide nature of the deposit does not lend itself well to the application of nickel sulfide fire assays techniques typically used in sulfide PGM deposits.
El Capitan Precious Metals, Inc. Reports Encouraging Metallurgical ... by Business Wire
 
 
 
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