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Recovering gold from old cyanide plating solution



August 10, 2010

Hi, I am selling my electroplating salts; however to do this, I would like to know how much gold ions are left in my potassium gold cyanide solution and salts. however this solution is very very old and has served me well. it is still impregnated with gold and conductive however when I took it to be sampled and calibrated, the laboratory person said that he is having major problems with his calibration. should I add more KCN, or precipitate the gold and get what I can out of it?

Jonathan Azzopardi
Shop Director - Hamrun, Malta, Europe



"Recovery And Refining Of Precious Metals"
by C.W. Ammen
from Abe Books
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August 12, 2010

If the solution is old, but still working, why do you want to discard it?

If you decide to discard it, then a small electrowinning cell with a high surface area cathode will recover nearly all of it in an easily recyclable form.

Lyle Kirman
consultant - Cleveland Heights, Ohio



August 19, 2010

hi I'm Bhupesh Mulik working as gold refining officer in a jewellery company
you first add NaOH caustic soda ,stir it then add zinc in it. filter the solution after 24 hrs. residue contains gold and silver and other base metals. recover it by proper refining technology.

Bhupesh Mulik
jewellery - Mumbai, India



June 11, 2011

Dear readers,
I have 50 grm of gold cyanide Au powder. I'd like to know how to make pure gold bar. What solution to use to make the bar?
Thank you

Regd
Prakash

prakash sankaranarayanan
- georgetown, Malaysia



June 2011

Hi, Prakash.

We appended your inquiry to a thread which hopefully answers it for you. Potassium gold cyanide is 68.3% gold, so that would be what you are shooting for if the PGC is pure and if your recovery method were 100% efficient. Good luck.

Regards,

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey


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