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Library > Metals > Refining
 
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[278] Maximizing Refining Returns for Platinum Alloys
Platinum jewelry manufacturing presents some very different concerns when discussing the collection of materials for refining purposes. The assumption that methods used for gold and silver collection and recovery can be used for platinum can lead to real problems and problems of perception.... (2003)
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Show me more articles from: [Platinum Guild International]|[Robin White]
Releated Categories: [Refining]

 

[251] Processes for refining gold jewelry scraps and wastes
When questions arise about manufacturing quality gold jewelry, manufacturers are eager to talk shop with their peers and industry experts. They want to know if they are using the right alloy for a specific application, casting at the appropriate times and temperatures, and annealing properly when work hardening a piece. Rarely, though, does the conversation turn to refining-an area of jewelry manufacturing that poses more questions than answers in many manufacturers' minds. Refining is a practice that must be done precisely and methodically to ensure the full recovery of gold, as well as an end product that is free of impurities, which can lead to quality problems when the metal is reused in production.... (2003)
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Show me more articles from: [AJM]|[Chris Corti]
Releated Categories: [Refining]
ISBN: B00006K39S

 

[950] Recycling of gold from electronics: Cost-effective use through ´Design for Recycling´
With over 300 tonnes of gold used in electronics each year, end-of-life electronic equipment offers an important recycling potential for the secondary supply of gold. With gold concentrations reaching 300-350 g/t for mobile phone handsets and 200-250 g/t for computer circuit boards, this "urbanmine" is significantly richer than what is vailable in primary ores. (2010)
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Show me more articles from: [The World Gold Council]|[Chris Corti]
Releated Categories: [Refining]

 

[232] Refining
The principle of this ancient, valued procedure is described here because of its historical interest, and with the thought that young people coming into the field should be aware of the basic procedures of the trade, even though they may not pursue them. In the case of precious metal refining, it is generally more efficient to send scrap to a reputable refiner where sophisticated equipment and years of experience will insure accuracy. In addition, the procedures described below use dangerous acids that mandate industrial quality ventilation and safety precautions, which makes the decision to send out refining chores even more compelling.... (2001)
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Show me more articles from: [The Theory and Practice of Goldsmithing]|[Prof. Dr. Erhard Brepohl]
Releated Categories: [Refining]
ISBN: 0961598492

 

[305] Small-medium scale refining by inquartation and parting
The small-medium scale refiner (typically up to 3-4 kg per batch) tends to adopt the Aqua Regia process as being a relatively straightforward technique, capable of producing gold with a purity in excess of 99.9%. The essential steps in the process are to dissolve the refinable material (such as jewellery process scrap) in aqua regia, a mixture of strong nitric and hydrochloric acids, and to selectively precipitate the gold from the resulting solution.... (1999)
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Show me more articles from: [The World Gold Council]|[Peter Raw]
Releated Categories: [Refining]

 

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