cupel


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cupel

[′kyü·pel]
(metallurgy)
A cup made of bone ash or magnesite, used in assaying precious metals.
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References in periodicals archive ?
Impure silver ingots from the reverb furnaces are fed to the cupels.
The most important characteristic of his kit is the silver-assay scale and the cupel mold with three hollow hemispheres, and his balance that attached to the lamp holder.
During cupellation, a large part of the lead and of the impurities such as copper, tin and other metals are oxidised and partly vapourised, partly absorbed into the pores of the cupel.
At Korea Zinc for example, a BBOC has replaced two cupels with the following benefits: reduction in refining cycle time from 10 days to 2 days; fuel consumption to 10% of original; silver inventory from 4 to 1.