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Umicore is the world's largest recycler of precious metals. [27] Most of the materials (around two-thirds in terms of refining charges) [28] put through the refining process are by-products from the production of non-ferrous metals, such as dross, matte, and speiss from the zinc smelting industry and anode sludge built up during electrolysis. [29]
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 ...
The company designed a processing line to include shredders and downstream separation equipment. At this time, Metech also discontinued receiving precious-metals-containing hazardous waste and scaled back its other local precious metals refining businesses that were not adding value to the company's focus on integrated electronics recycling. 2007
An Engelhard silver bar An Engelhard poured 2 oz 99.99% pure gold bar. Engelhard Corporation was an American Fortune 500 company headquartered in Iselin, New Jersey, United States. It is credited with developing the first production catalytic converter. In 2006, the German chemical manufacturer BASF bought Engelhard for US$5 billion.
This list of bullion dealers includes notable companies and organizations that deal in precious metals, such as gold and silver. This list is incomplete ; you can help by adding missing items . ( September 2014 )
Pages in category "Metal companies of the United States" The following 44 pages are in this category, out of 44 total. This list may not reflect recent changes .
An example of a Valcambi minted gold bar. Valcambi is a precious metals refining company located in Balerna, Switzerland, and a subsidiary of Rajesh Exports Limited.Valcambi is owned by European Gold Refineries, which is owned by Global Gold Refineries AG, which in turn is 95% owned by REL Singapore PTE Ltd. and 5% by Rajesh Exports Limited India.
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.