Sloshing loads of Peroxide in will do that for sure Dark. As mentioned before, an initial small amount is a useful catalyst to get things moving.I've seen many posts that state addition of peroxide will put PMs into solution...
Sloshing loads of Peroxide in will do that for sure Dark. As mentioned before, an initial small amount is a useful catalyst to get things moving.I've seen many posts that state addition of peroxide will put PMs into solution...
Nice.So it took a while but I am getting there. The solution was too saturated so I refreshed it with 500ml HCl and turned on the bubbling again.
There was still about 5% gold pins on the fingers.
I rinsed it for the first time and this is the result. What a great sight to see for the first time.
View attachment 64968
I collected the HCl with Copper to get the clean in a later stage.
Then I rinsed the filter with plenty of water and collected that in a separate flask.
It is light blue. Can I neutralize it and drain in through the sink or is there too much metal in there?
View attachment 64969
What about the light blue solution which contains mainly of water with a little bit of left over copper solution?Nice.
Just set the AP solution aside and use next time.
It lives practically for ever.
Put it with the rest of your liquid waste and run it through a proper waste treatment.What about the light blue solution which contains mainly of water with a little bit of left over copper solution?
Can I dispose of that through the drain after it is neutralized or is there too much metal still in it?
The good thing about this method is it is a set it and forget it method.Thanks a lot for all the great information everybody! Really helpful and I learned a lot.
Now this method is working well but it is extremely slow.
I want a faster way to recover the metals from RAM scrap.
Is the next logical method to use Nitric acid or is there a cheaper (or safer) alternative that might be effective?
Also very difficult to get Cyanide in Europe, if not impossible.The good thing about this method is it is a set it and forget it method.
It do not need to be supervised.
And the cheapest and safest out there.
The Nitric route is faster, more expensive and need to be "supervised".
Cyanide is also good as it if done right will only take the Gold(values).
But is a very involved and dangerous process if done wrong.
If you go for Silver there is practically only one option, Nitric.Also very difficult to get Cyanide in Europe, if not impossible.
You mentioned gold, values.
Do you mean there is nothing else to be gained? I think there is silver, tin and copper as well
Sounds logical indeed. I have some silver colored particles floating around with the gold but for now the amount is too low to even bother.If you go for Silver there is practically only one option, Nitric.
But then again there is very little if any Silver in PCBs.
Excluding dangerous exotic solution like Cyanides.
Depending how you have treated it it is unlikely to be Silver as it don't dissolve if Chlorides are present.Sounds logical indeed. I have some silver colored particles floating around with the gold but for now the amount is too low to even bother.
It is indeed not dissolved like the gold isn't so it must be silver. All other silver looking metals like Tin and Zinc dissolve in HCl.Depending how you have treated it it is unlikely to be Silver as it don't dissolve if Chlorides are present.
If you are going for all values there is only one way really.
Smelting and electrolytic separation.
Sir Yggdrasil, is it possible to have only HCL bath solution that can accommodate RAM fingers without having to add Hydrogen Peroxide? Just a bubbler and HCL bath + RAM fingers? OR Bubbler + HCL + tiny volume of Hydrogen Peroxide bath? Because I'm confused, I thought HCL + Hydrogen Peroxide is not enough to melt the gold-plated fingers.In there is the rub, if you do not manage to dissolve all base metals, you risk leaving some Gold inside the PCBs.
So why add Peroxide if you are not in a hurry?
You have obviously not read or studied what we have given you.Sir Yggdrasil, is it possible to have only HCL bath solution that can accommodate RAM fingers without having to add Hydrogen Peroxide? Just a bubbler and HCL bath + RAM fingers? OR Bubbler + HCL + tiny volume of Hydrogen Peroxide bath? Because I'm confused, I thought HCL + Hydrogen Peroxide is not enough to melt the gold-plated fingers.
In fact some of us prefer to not use peroxide. With an air bubbler peroxide is just another chemical we can get by with out. Keep it simple when possible.The oxygen from the air bubbler is plenty enough.
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