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Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing 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
⇦ this on
eBay
or
Amazon [affil links] 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
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
⇦ this on
eBay
or
Amazon [affil links] or sodium thiosulphate
⇦ this on
eBay
or
Amazon [affil links]
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
⇦ this on
eBay
or
Amazon [affil links] for experiment in my company lab.
jewellery- Mumbai, India
June 3, 2010
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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