CPU Lids and the gold on the bottom of them

silversaddle1

Well-known member
Joined
Mar 19, 2008
Messages
1,489
Location
Iowa
I had posted a photo of these lids in a FB group for discussion about recovery and values. Some of them say they have good plating and they are worth refining, some have said not so much. I was wondering what the page here thinks. This tray has 18 pounds in it, and were all knocked off green fiber CPU's with gold pins. I also did a few of the green fiber pinless ones, seems not all have the plating, and the one's that do don't seem to have the surface area as the pinned ones did. I never even knew there was gold under the lid until I knocked a few of the lids off. I was removing the lids to see how hard it was to do since the fiber cpu will sell for more money without the lid.
 

Attachments

  • lids.jpg
    lids.jpg
    515.6 KB · Views: 34

UrbanScrapper

New member
Joined
Sep 11, 2017
Messages
3
I am sure I'll get hammered for this. Test the lid(s) for copper. If they are copper, melt them into a dore bar and refine them in a CuSO4 electrolyte. Then process the slimes for the Au content. Or sand of the gold plating and process that...
 

silversaddle1

Well-known member
Joined
Mar 19, 2008
Messages
1,489
Location
Iowa
I am sure I'll get hammered for this. Test the lid(s) for copper. If they are copper, melt them into a dore bar and refine them in a CuSO4 electrolyte. Then process the slimes for the Au content. Or sand of the gold plating and process that...
The lids are nickel plated copper.
 

niks neims

Well-known member
Joined
Jun 7, 2017
Messages
341
Location
Latvia
My guess is ENIG,

Easy enough to test - drop one piece in nitric - if the foil stays together (or in flakes at least) it's good thickness, but I'd, bet it will disintegrate in to fine powder...

Also I've heard (here) that clump of solder (connecting crystal to heatsink) is indium...
 

shadybear

Well-known member
Joined
Mar 1, 2007
Messages
174
Location
Steubenville,Ohio
OK, so you melt the copper ,nickel, Indium and ? into bar, refine through copper cell.
I would have the gold, nickel, Indium in slimes how do you take out the Indium?
 

orvi

Well-known member
Joined
Apr 13, 2021
Messages
252
I am sure I'll get hammered for this. Test the lid(s) for copper. If they are copper, melt them into a dore bar and refine them in a CuSO4 electrolyte. Then process the slimes for the Au content. Or sand of the gold plating and process that...
Dissolving will be overkill, i think from first point maybe electrorefining the melted bars in electrolytic cell. Maybe sulfuric cell will do the job in removing just plating better.
 

Martijn

Well-known member
Joined
Aug 3, 2014
Messages
665
Location
Netherlands, Zeeland
A sulphuric stripping cell will leave the copper base untouched. Perfect for cementing in the stockpot after stripping. Or even without stripping should in time leave only the gold foils in the stockpot.
 

speed

Active member
Joined
Aug 13, 2017
Messages
30
As mentioned if you run a copper cell they can go through that but it wouldn't be worth setting up a copper cell just for those lids. Theres virtually no gold value in them

I chuck them in my stock pot. Plating comes off then when stock pot gets a clean out they go in the copper scrap.
 

Latest posts

Top