File:Cupels for assays and refining noble metals.jpg

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Cupels for assays and refining noble metals, early XX cent.

Summary

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Description
English: Cupels, i.e. porous crucibles made e.g. of bone ash or magnesite, used in the process of cupellation for the acquisition and purification of noble metals, as well as the determination of the composition of these ores. Dissolved at high temperature in molten lead, the ore is reduced by charcoal, which burns in oxygen penetrating through the porous walls of cupel. At the end of the process, the cooled cupel is broken, and at its bottom is a layer of precious metal with a density greater than lead.
Polski: Kupele, czyli czyli porowate tygle wykonane np. z popiołu kostnego lub magnezytu, służące w procesie kupelacji do uzyskiwania i oczyszczania metali szlachetnych, jak i oznaczania składu rud tych metali. Rozpuszczona w wysokiej temperaturze w stopionym ołowiu ruda jest redukowana np. węglem drzewnym, który spala się w tlenie przenikającym przez porowate ścianki kupeli. Na końcu procesu ostudzona kupela jest rozbijana, a na jej dnie znajduje się kulka metalu szlachetnego charakteryzującego się gęstością większą niż ołów.
English: Cupels for assays and refining noble metals, early XX cent.
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Author LukaszKatlewa

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