I know that trying to recover elemental metal straight from a plating solution isn't something that is normally done, but I figured I'd ask. I have probably 10 liters of Pallaspeed plating solution (some containers say 3.963 grams/liter, others say 25 grams/500mls), so you can see why Im interested.
From what I can tell from my searching :
https://products.riogrande.com/content/Safety-Data-Sheets/335013-SDS.pdf
This is telling me that the solution is Palladium ethylenediamine sulfate.
I found this patent
https://patentimages.storage.googleapis.com/44/95/fe/bc6a35cccfc90b/US20030047460A1.pdf
This is saying that they used Palladium Nitrate and mixed it with sulfuric acid.
nitric acid and water is removed by distillation
residue is evaporated and redissolved into water to make palladium sulfate
palladium sulfate is then mixed in solution with ethylenediamine
filtration and drying creates this complex palladium salt
That is then used to make the plating solution
So my question is really - what is the best way to recover the palladium? Is is best to just use it as a plating solution and plate several items and then try to recover the palladium? Or since I have so much solution, is there a multi-step way to precipitate out the metallic palladium, dry it and then melt into a button?
That is really the goal, to recover the palladium into a (hopefully) big button
The solutions all have an expiration date of around 2012, so I would probably have a difficult time trying to sell it outright to someone that would use it as a plating solution. And since we aren't planning on plating anything again, we have no use for it in it's current state.
I have access to many different chemicals that can be used as reagents in this exercise (DMG, sodium borohydride, etc). Im not a chemist by trade, so if anyone has any guidance on where to start my research that would be extremely helpful.
Thanks.
From what I can tell from my searching :
https://products.riogrande.com/content/Safety-Data-Sheets/335013-SDS.pdf
This is telling me that the solution is Palladium ethylenediamine sulfate.
I found this patent
https://patentimages.storage.googleapis.com/44/95/fe/bc6a35cccfc90b/US20030047460A1.pdf
This is saying that they used Palladium Nitrate and mixed it with sulfuric acid.
nitric acid and water is removed by distillation
residue is evaporated and redissolved into water to make palladium sulfate
palladium sulfate is then mixed in solution with ethylenediamine
filtration and drying creates this complex palladium salt
That is then used to make the plating solution
So my question is really - what is the best way to recover the palladium? Is is best to just use it as a plating solution and plate several items and then try to recover the palladium? Or since I have so much solution, is there a multi-step way to precipitate out the metallic palladium, dry it and then melt into a button?
That is really the goal, to recover the palladium into a (hopefully) big button
The solutions all have an expiration date of around 2012, so I would probably have a difficult time trying to sell it outright to someone that would use it as a plating solution. And since we aren't planning on plating anything again, we have no use for it in it's current state.
I have access to many different chemicals that can be used as reagents in this exercise (DMG, sodium borohydride, etc). Im not a chemist by trade, so if anyone has any guidance on where to start my research that would be extremely helpful.
Thanks.