Home /
Search 🔍
the Site
pub Where the world gathers for
plating, anodizing, & finishing Q&As since 1989


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

Affil. Link
Your purchases make finishing.com possible

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


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.


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

finishing.com is made possible by ...
this text gets replaced with bannerText
spacer gets replaced with bannerImages

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories:

Chemicals &
Consult'g, Train'g
& Software

About/Contact    -    Privacy Policy    -    ©1995-2023 finishing.com, Pine Beach, New Jersey, USA