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cupellation

n. 灰皿提炼法,灰吹法

灰皿提炼法,灰吹法

The Collaborative International Dictionary of English v.0.48 (gcide)

Cupellation \Cu`pel*la"tion\ (k[=u]`p[e^]l*l[=a]"sh[u^]n) n.
[See {Cupel}.]
The act or process of refining gold or silver, etc., in a
cupel.
[1913 Webster]

Note: 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 oxidized,
dissolved, and carried down into the porous cupel,
leaving the unoxidizable precious metal. If lead is not
already present in the alloy it must be added before
cupellation.
[1913 Webster]

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Cupellation - Wikipedia
Cupellation is a refining process in metallurgy in which ores or alloyed metals are treated under very high temperatures and subjected to 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
Cupellation | Refining, Assaying, Smelting | Britannica
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 high-temperature-resistant, material) and then directing a blast of hot air on it in a special furnace
CUPELLATION Silver Assaying - 911Metallurgist
Cupellation is at once the neatest and the most important of the dry methods of assaying Its purpose is to remove easily oxidisable metals, such as lead and copper, from silver and gold, which are oxidisable with difficulty
Cupellation and the Birth of Precious Metal Refining
Cupellation is a refining process used to extract pure gold from lead ores Learn more about how cupellation works by reading our blog post
Cupels, Cupels and Cupellation - Fire Assay Flux
Cupellation is an oxidizing fusion of an alloy of lead, gold, and silver in an absorbent vessel known as a cupel
CUPELLATION Definition Meaning - Merriam-Webster
The meaning of CUPELLATION is refinement (as of gold or silver) in a cupel by exposure to high temperature in a blast of air by which the unwanted metals are oxidized
Cupellation – Antique Jewelry University
The word cupellation is used to either indicate a precise, analytical method of metal purity testing or a certain way of refining precious metals The process takes advantage of the fact that precious metals don’t oxidize or chemically react while base metals do

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