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Q&As since 1989
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Recover gold from jewelry polishing dust & sweeps with oven or using thiourea
Q. I Bhupesh Mulik am working as refining officer in jewellery company. I am using sodium cyanide for recovering gold from jewellery polishing dust after aqua regia process. I got around 35 gm gold from 10 kg residue(jewellery polish dust).
But I know that it is poisonous and dangerous. so I want to start thiourea [on
eBay or
Amazon] leaching process.
Can anyone guide me simple and easy process of thiourea leaching?
employee - Mumbai, India
Q. `Looking for the perfect oven or furnace to burn out brushes, paper, gloves, buffs. please send information
Jose ParejaManufacture - Hollywood, Florida
October 29, 2008
"Refining Precious Metal Wastes"
by C. M. Hoke
on
AbeBooks
or
Amazon
(affil links)
"Recovery and Refining Of precious Metals"
by C.W. Ammen
on
AbeBooks
or
eBay
or
Amazon
(affil links)
A. Without incineration, I doubt if direct leaching will be that efficient, no matter what you use. Here is a non-cyanide method that works.
www.goldrefiningforum.com/phpBB3/viewtopic.php?f=40&t=2498&p=38092&hilit=polishing+dust#p38092
- Nevada, Missouri, USA
June 2, 2010
Thanks Chris,
there is one article of me on finishing.com of question no.34273, or recovery of gold by bombing on ganoksin.com (200409) at www.ganoksin.com/orchid/archive/200409/thrd17.htm
you will get my simple and easy process of cyanide leaching, but I want simple and easy process by using thiourea [on
eBay or
Amazon] or sodium thiosulphate [on
eBay or
Amazon]
because cyanide is dangerous mainly HCN gas.cyanide affects on hemoglobin.
I had not understand how to give redox potential of 150 mv to 250 mv. to leaching solution? how much % of recovery obtained by thiourea?
I've not started this process yet but I ordered 500 gm thiourea [on
eBay or
Amazon] for experiment in my company lab.
jewellery- Mumbai, India
June 3, 2010
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Ed. note July 2021: Ganoskin.com still has archives of such discussions, but that link no longer appears to point to the appropriate place.
June 10, 2010
Q. I'm currently leaching gold using cyanide.but I know that it is toxic, so I want to know simple and easy process of leaching of gold and silver chloride using thiosulphate. which thiosulphate should I use, ammonium or sodium?
bhupesh mulik [returning]employee - Mumbai, India
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Ed. note to our gentle readers: Please see also topic 41239, "Recovery of gold from polishing dust, sweeps floor or dirt material"
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