This is what I saw him doing for depopulated celphone board and other parts after burning them all without the ICs they were done separately
Processing mobile phone parts
- Thread starter Zolotov
- Start date
Help Support Gold Refining Forum:
You have studied too much videos and not enough C.M. Hoke
This method is wasteful and has a risk of producing explosive compounds and loss of Gold.
Dissolving the fingers should be done with either AP or Nitric alone until the foils are released from the fingers.
If one use AR one has to make absolutely sure ALL the base metals are dissolved.
This usually end up with using too much Nitric, and the surplus has to be destroyed (not neutralized) by Sulfamic.
When the solution is free of Nitric and still acidic pH 1-2 range, add SMB in your own way, dissolved or powder don't make much difference.
Add 1:1 according to expected Gold yield.
If very dilute or high in base metals one will have a very fine precipitate which will take time to settle.
If its fairly concentrated and clean it will drop more or less instantly.
What do you mean with Burning here?
Yes, it is dangerous and toxic. It is litharge (PbO). Don't breathe with it.
Burning meant=Incinerate
I'm still studying I have messed up a lot following this videos so far I have only been experimenting
Still got I've 1000cellphon PCBs waiting
And maybe 200 desktop PCBs
I'm doing research so I don't waste so every kind of criticism is welcome please correct me by the way I donated I think 2 days ago
I'm living this forum
Someone one said to me if you wanna do recycling start with a big amount because you might not be able to recover you cost and I believe him from what I have see during this 1 year, recycling is not so easy as they show in videos
You should really pyrolize first, with reburn if the fumes.
Are all these PCBs depopulated?
Videos almost always lies.
They are not made for education, but for clicks and views to generate money for the maker. Shortcuts everywhere, all mistakes are removed and they get these massive yields from things containing next to no Gold.
Yes
Well then all the gold you have is what you see on the board.
So if each board is well, estimated to 6 by 12 cm and 100% plated at the thickest ENIG, about 0.2 micrometers.
100 boards will give around 25-28 ish grams of Gold.
But since the plating area usually are less then 5-10% of the area, we are down to best scenario 2.5-2.8 grams.
And then the ENIG is usually in the lower end so we end up with around half of that again.
So somewhere between1 and 1.5 grams at best per 100 boards.
So if each board is well, estimated to 6 by 12 cm and 100% plated at the thickest ENIG, about 0.2 micrometers.
100 boards will give around 25-28 ish grams of Gold.
But since the plating area usually are less then 5-10% of the area, we are down to best scenario 2.5-2.8 grams.
And then the ENIG is usually in the lower end so we end up with around half of that again.
So somewhere between1 and 1.5 grams at best per 100 boards.
A lot of those heave black berry boards I should count how many I have
Attachments
According to my crappy maths, 6 x 12 x 0,00002 cm = 0,00144 cm3 of gold. x 100 boards will get 0,144cm3 of gold, which is 2,77g of gold.
If we assume 10% coverage by gold plating, that yields 0,277g of gold.
ENIG is usually 0,05-0,23 um thick, so we are at the top side of the spectrum of thickness. There is high probability that actual yield would be a fraction of the above number.
Well I might have missed a decimal or two, since I used the phone calculator.
I thought it looked a bit high.
- Joined
- Sep 28, 2021
- Messages
- 73
Quite an interesting approach, but I was thinking of doing the following:
1. After tearing down all phones remove anything with metal pins for processing later
2. Remove all Aluminum/steel covers and place in appropriate pot (Alu for casting use, iron is scrap)
3. Remove pin chips for later, along with any visible MLCC
4. All boards (populated) are broken down through an old cast iron sausage mince machine, then run through a blender to make everything dust
Unsure on the next steps as I have no acid available and am still reading Hoke's guide. I have the thought that I could use AP to remove all tin (solder) etc first, but am open to suggestions.
Doing this is more of a therapeutic exercise for me, as I know it will cost more on low quantities of materials, and had planned to follow the guide of Hoke with the suitable materials I have to hand, but I feel one read of her book is not enough, so more study is done before I delve into using any acids.
If anyone has thoughts on what I am intending to do, I'd appreciate the advice. I don't care for the money right now, as its a learning exercise and once I understand things more I will probably look to get items of better quality (and less tedious).
Thanks
1. After tearing down all phones remove anything with metal pins for processing later
2. Remove all Aluminum/steel covers and place in appropriate pot (Alu for casting use, iron is scrap)
3. Remove pin chips for later, along with any visible MLCC
4. All boards (populated) are broken down through an old cast iron sausage mince machine, then run through a blender to make everything dust
Unsure on the next steps as I have no acid available and am still reading Hoke's guide. I have the thought that I could use AP to remove all tin (solder) etc first, but am open to suggestions.
Doing this is more of a therapeutic exercise for me, as I know it will cost more on low quantities of materials, and had planned to follow the guide of Hoke with the suitable materials I have to hand, but I feel one read of her book is not enough, so more study is done before I delve into using any acids.
If anyone has thoughts on what I am intending to do, I'd appreciate the advice. I don't care for the money right now, as its a learning exercise and once I understand things more I will probably look to get items of better quality (and less tedious).
Thanks
dannlee
Well-known member
Didn’t see it mentioned - Beryllium alloys used since they make light & strong whatzits to keep weight & size down.. . Berylliosis.
Zero dust from, burning of or muddling in ashes that might* have berylilum traces in them.
Zero dust from, burning of or muddling in ashes that might* have berylilum traces in them.
