Photobacterium
Well-known member
- Joined
- Jul 7, 2011
- Messages
- 113
I thought you guys might enjoy this.
Tom's Hardware is a website that was started by a German medical student named Tom Pabst. Somehow he managed to get his medical degree & to still sell the website for $26 Million.
Now it's just another corporate computer website, but they did have a good article recently about recovering PM's from computer CPU's. They use "Acid Nitrique" - maybe it was done by one of their French editors.
25 photos showing the process. First they pull the silver, maybe 1/3 ounce, then the gold, maybe 1/2 gram.
http://www.tomshardware.com/picturestory/576-gold-silver-cpu.html
They use Nitric to extract the silver (along with impurities), then Acid-Peroxide & Acid-Clorox to get the gold.
I hadn't yet seen a tutorial for processing CPU's, so this is food for thought.
Slide 4 - They give the formula for Copper in Nitric Acid -
Cu + 4 HNO3 -> Cu(NO3)2 + 2 NO2 + 2 H2O
Slide 12 - They use HCl & Zinc to provide the Hydrogen to reduce the Silver Chloride to Metallic Silver -
The zinc has reacted with the hydrochloric acid to form dihydrogen (and zinc chloride).
Zn + 2 HCl -> H2 + ZnCl2
The dihydrogen will then reduce the silver chloride; metallic silver will then form.
H2 + 2 AgCl -> 2 Ag + 2 HCl
Slides 21 & 22 - They give the formulas for the use of SMB -
"To recover the metallic gold, we need to get the gold that’s in solution to precipitate. For that, we use powdered sodium metabisulfite. In the presence of water, the sodium metabisulfite produces sodium bisulfite.
Na2S2O5 + H2O -> 2 NaHSO3
The sodium bisulfite is what will allow the gold to precipitate.
3 NaHSO3 + 2 AuCl3 + 3 H2O -> 3 NaHSO4 + 6 HCl + 2 Au"
Learn something new - it looks like the addition of SMB creates additional HCL in the process of the gold being precipitated.
Tom's Hardware is a website that was started by a German medical student named Tom Pabst. Somehow he managed to get his medical degree & to still sell the website for $26 Million.
Now it's just another corporate computer website, but they did have a good article recently about recovering PM's from computer CPU's. They use "Acid Nitrique" - maybe it was done by one of their French editors.
25 photos showing the process. First they pull the silver, maybe 1/3 ounce, then the gold, maybe 1/2 gram.
http://www.tomshardware.com/picturestory/576-gold-silver-cpu.html
They use Nitric to extract the silver (along with impurities), then Acid-Peroxide & Acid-Clorox to get the gold.
I hadn't yet seen a tutorial for processing CPU's, so this is food for thought.
Slide 4 - They give the formula for Copper in Nitric Acid -
Cu + 4 HNO3 -> Cu(NO3)2 + 2 NO2 + 2 H2O
Slide 12 - They use HCl & Zinc to provide the Hydrogen to reduce the Silver Chloride to Metallic Silver -
The zinc has reacted with the hydrochloric acid to form dihydrogen (and zinc chloride).
Zn + 2 HCl -> H2 + ZnCl2
The dihydrogen will then reduce the silver chloride; metallic silver will then form.
H2 + 2 AgCl -> 2 Ag + 2 HCl
Slides 21 & 22 - They give the formulas for the use of SMB -
"To recover the metallic gold, we need to get the gold that’s in solution to precipitate. For that, we use powdered sodium metabisulfite. In the presence of water, the sodium metabisulfite produces sodium bisulfite.
Na2S2O5 + H2O -> 2 NaHSO3
The sodium bisulfite is what will allow the gold to precipitate.
3 NaHSO3 + 2 AuCl3 + 3 H2O -> 3 NaHSO4 + 6 HCl + 2 Au"
Learn something new - it looks like the addition of SMB creates additional HCL in the process of the gold being precipitated.
