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2. Bottom-blown oxygen converter - Wikipedia

   en.wikipedia.org/wiki/Bottom-blown_oxygen_converter

   As with recovering silver in lead smelting, reverberatory furnaces are often used in the copper refining industry for the purification and recovery of gold and silver from anode slimes. [ 16 ] [ 17 ] However, the reverberatory furnaces suffer from similar disadvantages in copper anode doré production as they do in lead refineries, [ 18 ...

3. Gold parting - Wikipedia

   en.wikipedia.org/wiki/Gold_parting

   Silver was removed by filtering and gold was then recovered by evaporating the liquid and heating the residue. Nitric acid was suitable for separating small quantities of gold from silver and aqua regia used to separate small quantities of silver from gold. Aqua regia acid process is used by refiners of scrap gold used in jewelry manufacturing.

4. Cupellation - Wikipedia

   en.wikipedia.org/wiki/Cupellation

   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.

5. Refining (metallurgy) - Wikipedia

   en.wikipedia.org/wiki/Refining_(metallurgy)

   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 ...

6. Smelting - Wikipedia

   en.wikipedia.org/wiki/Smelting

   Electric phosphate smelting furnace in a TVA chemical plant (1942) Smelting is a process of applying heat and a chemical reducing agent to an ore to extract a desired base metal product. [1] It is a form of extractive metallurgy that is used to obtain many metals such as iron, copper, silver, tin, lead and zinc.

7. Metallurgical furnace - Wikipedia

   en.wikipedia.org/wiki/Metallurgical_furnace

   A metallurgical furnace, often simply referred to as a furnace when the context is known, is an industrial furnace used to heat, melt, or otherwise process metals. Furnaces have been a central piece of equipment throughout the history of metallurgy ; processing metals with heat is even its own engineering specialty known as pyrometallurgy .

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9. Non-ferrous extractive metallurgy - Wikipedia

   en.wikipedia.org/wiki/Non-ferrous_extractive...

   First, the gold-silver ore is melted down in the crucible, but with an excess amount of lead. The intense heat then oxidizes the lead which reacts quickly and binds with the impurities in the gold-silver ore. Since both gold and silver have low reactivity with the impurities, they remain behind once the slag is removed. The last stage involves ...