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Cleaning potassium gold cyanide that is contaminated with silver and copper

I am a chemical analyst for a plating shop. I am trying to remove silver waste (potassium silver cyanide) and copper waste (potassium copper cyanide, possibly copper tetracyanide?) From potassium gold cyanide. I am hoping to replate with the potassium gold cyanide, so I am looking for a method that doesn't ruin it. The previous gold plater in the shop mixed all the waste together.

Travis Poggi
plating shop employee - Tucson, Arizona, United States
May 31, 2011

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Hi Travis

Gold is only plated onto items that are (or become) high value.
To use chemicals that are of suspect purity is a high risk strategy.
I would strongly advise that you send your scrap for refining. If you speak to your usual supplier of GPC, they will often exchange scrap for an equivalent amount of pure salts (less a percentage to pay for the refining).

Geoff Smith
Hampshire, England
June 6, 2011

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hi,
u want to remove copper and siver not gold from cyanide solution, but as per my knowledge, it is not possible. You have to remove all three metals from contaminated CN plating solution, and then make a plating solution using pure refined gold.

Bhupesh Mulik
- Mumbai, India
July 27, 2011