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The required temperature varies both in absolute terms and in terms of the melting point of the base metal. Examples: Iron oxide becomes metallic iron at roughly 1250 °C (2282 °F or 1523 K), almost 300 degrees below iron's melting point of 1538 °C (2800 °F or 1811 K). [5]
In one of the previous melting stages, lead was added. Gold and silver preferentially dissolved in this, thus providing a means of recovering these precious metals. To produce purer copper suitable for making copper plates or hollow-ware, further melting processes were undertaken, using charcoal as fuel. The repeated application of such fire ...
Silver is often found as a by-product during the retrieval of copper, lead, zinc, and gold ores. [12] Silver has long been valued as a precious metal. Silver metal is used in many bullion coins, sometimes alongside gold: [13] while it is more abundant than gold, it is much less abundant as a native metal. [14]
16th century cupellation furnaces (per Agricola). 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.
Bakewell, Peter J. Silver Mining and Society in Colonial Mexico: Zacatecas, 1540-1700. New York: Cambridge University Press 1971. Bakewell, Peter J. Miners of the Red Mountain: Indian Labor in Potosí, 1545-1650. Albuquerque: University of New Mexico Press 1984. Bakewell, Peter J., ed. Mining of Gold and Silver in the Americas. Brookfield, VT 1997.
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Metal workers had long known that Central European copper ore was rich in silver, so it was only a matter of time until a method was discovered that could separate the two metals. [3] Liquation is first documented in the archives of the municipal foundry in Nuremberg in 1453. Nuremberg was one of Germany's main centres of metal refining and ...
It forms on the surface of low-melting-point metals such as tin, lead, zinc or aluminium or alloys by oxidation of the metal. For higher melting point metals and alloys such as steel and silver, oxidized impurities melt and float making them easy to pour off. With wrought iron, hammering and later rolling remove some dross. [1]
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