CPU collection lot

[kjavanb123]

All,

I just like to share with you the following lot that I acquired from a friend. It weighs 1013 grams, 38 pieces total, with the following order

3 pieces of IBM
12 pieces of VIA
5 pieces of IntelDX4
7 pieces AMD P75
2 pieces of IntelDX2 (486)
1 piece of IntelDX (486)



I am gonna process and post the result. After warming up the HCL, how would i know the nitric addition is enough?

Regards,
Kevin

 

[Geo]

add in small increments and let the reaction of the nitric stop before adding more. cover the reaction with a watch glass or a glass saucer so you can see when the red NOx fumes are no longer being evolved. proceed this way until ALL the metal has been dissolved. if you stop short of this your values will cement out on any iron or copper left undissolved.

 

[trashmaster]

and please do this outside and away from anything that might RUST.

be safe;;;;

 

[necromancer]

anyone want to estimate the total may be ??

 

[gold4mike]

2.2 grams

 

[kjavanb123]

Thanks all for your feedback,

I only have an estimate on VIR C3 processor which was 0.21 grams of gold powder. There are 12 of them in the lot, so I am assuming 12 x 0.21 = 2.5 grams?? Considering each of these CPUs were bought at $4 each, I will know how the profit if any will be made.


Here are just some photos of crushed Intel DX, DX2 and DX4s


Also separated the IBMs and VIR C3 processor which i am going to process separately.


Is this proper way of removing the back of the gold lid on CPUs?


Back of the IBM CPU after being removed with hammer to expose the golden wires


Now, I am at a crossroad here on which path to go, Steve, and some other members here suggested removing the base and silver with nitric, then AR the remain, but Samuel suggest in the video shown in youtube to dissolve the CPUs in AR.

I will keep you posted on result hope that helps out someone in the forum in future.

Kevin

 

[gold4mike]

I've been using a two step Poorman's AR method for all ceramic CPU's. I use roughly half as much as I think I'll need to completely dissolve everything on the first step.

Let it sit overnight so any gold that dissolved cements back out.

Test for values to confirm it's barren, pour off liquid.

Add water and HCl, then Sodium Nitrate in very small increments until everything has just dissolved.

This ensures I don't use too much nitric and I'm precipitating from a much less dirty solution.

 

[philddreamer]

Kevin, you should apply heat & remove the" silicon chips" so to make sure you get the gold behind them. Sometimes just runnunig them thru the AR doesn't remove them & gold stays behind.

Just a thought.

Take care!

Phil

correction: should read= "silicon chips" instead of "silicon lids".

 

[kjavanb123]

Hi Phil,

Thanks for the tip. I used hammer, and as u note from the pictures there are no golden wires around the corners of the rectangular of the gold lid back. I have double check them all to make sure nothing is left. But I am sure for bigger lots some sort of heat would be required.

Here is also the gold powder from sample D of my previous post. It was an Intel Celeron CPU. I will dry it tomorrow and weigh the powder and post it.

 

[philddreamer]

Sorry Kevin, I made a mistake.
I should have written "silicon chip", the ones inside the cpu's.

Phil

 

[kjavanb123]

Sorry Kevin, I made a mistake.
I should have written "silicon chip", the ones inside the cpu's.

Phil

Hi Phil,

I am not sure where inside the CPU, could u point it out in my pictures?

Thanks
Kevin

 

[kjavanb123]

All,

I leached the Intel 486 DX , DX 2 and DX4 series which were crushed into small pieces. I warmed it up to almost 80c, added nitric in 10ml increment then brown fumes are observed till no more, then another 10ml, till almost 160ml of nitric was used. vs. 460ml of Hcl. As you note from the pictures the gold is the last one to go into AR.

Keep you posted soon.

First minutes into addition of HCL and warming up the solution


After some boiling and nitric addition


Gold being dissolved as the last metals to go into AR


Regards,
Kevin

 

[philddreamer]

Its the "glass" chip right in the center, inside of the ceramic, where all the tiny gold wires are connected to.
If you were to take one of the cpu's and heat it, then try prying it off, you'll see the gold behind the silicon chip. When you don't use heat at all, these chips tend to stick even thru AR, and you don't recover the gold behind them. I use heat to incinerate, thus getting rid of gunck & dirt, plus I remove the silicon chips while I'm at it.

Phil

This was from some left over ceramic PP's; I ran them thru months later, and recovered more gold.
http://goldrefiningforum.com/phpBB3/viewtopic.php?f=52&t=12845&p=130797&hilit=pentium+pro#p128797

 

[kjavanb123]

Phil,

Thanks for your tip on silicon part of the chip. I will double check the remaining CPUs I processed. I added almost 10 grams of SMB to the AR solution from processing 15 pieces of Intel 486 DX, Dx2 and DX4 series plus AMD 6. It has been 9 hrs since the SMB addition and following happened. I guess I have to wait for at least 12hrs or more? Also SMB addition should be the expected amount of gold correct? what happens when I add more SMB to the solution? Solution still test positive for gold, so I have to wait till stannous test negative then proceed with filtering and drying the gold powder.

Here are some latest photos
mixed of silver/lead nitrate from processing a bunch of Intel 486 DX series.


Gold flakes


Gold powder layer at the bottom?


Regards,
Kevin

 

[Geo]

you dont filter gold powder. you should have filtered before you added SMB. if you added SMB and your still getting a positive, it probably means you have free nitric acid that is stopping the precipitation. you may add more, but only small amounts until you get a negative test.

 

[kjavanb123]

Geo,

I have filtered the AR solution before addition of SMB. Still result are positive for gold but not much in there, so I am going to wait for another 10 hrs or so make sure all the gold be dropped.

As for the silver chloride / lead sulphate mix from previous pictures, I tried boiling in water and nothing happened, so I assume the mix is not lead sulphate. I tried addition of ammonia to the mix and it seems to dissolve something as you can see picture below, so I am assuming the dissolved section was silver chloride. How do I drop silver from this new solution? Is this similar to purifying palladium salt where I add ammonia and stir wait for a 24 hr and filter add hcl to the remaining solution so the yellow canary pure Pd powder precipitate?

Here are the pictures of what i am talking

The mix powder of silver or lead salt


The mix being boiled in water and it seems nothing got dissolved hence no lead in the mix


Finally introducing ammonia 25% to previous solution and the color changed so I concluded part of silver chloride must have been dissolved
View attachment 1

After some stirring, there are some undissolved materials at the bottom, curios what it is.


Thanks in advance
Kevin

 

[Harold_V]

As for the silver chloride / lead sulphate mix from previous pictures, I tried boiling in water and nothing happened, so I assume the mix is not lead sulphate.

Lead sulfate is not water soluble. Lead nitrate is soluble in hot water.

How do I drop silver from this new solution?

You should be able to make a recovery simply by adding HCl.

Is this similar to purifying palladium salt where I add ammonia and stir wait for a 24 hr and filter add hcl to the remaining solution so the yellow canary pure Pd powder precipitate?

In my opinion, yes, it is similar. It might pay to get the professional advice of the more learned of the group, however.

Harold

 

[kjavanb123]

Harold,

I followed purifying palladium method but I put a copper wire in ammonia silver solution immediately reaction started and produced some gray foam around

Geo,
regarding the gold solution and free nitric in it, I kept adding SMB to it and got brownish fume for a second, it still positive for gold, should I proceed to nitric removal with steam bath? Or keep on adding SMB till I get negative for gold presence in solution?

Thanks
Kevin

 

[Geo]

as long as your getting red fume when you add SMB then you have free nitric. at the risk of adding a lot of salt to the reaction, i would keep adding small amounts of SMB until no fumes are emitted. this will mean the free nitric has been consumed.

 

[kjavanb123]

Geo,

I have been adding a lot of SMB to the solution even in small increments and still getting the brownish foams as shown in the picture below, and solution still positive for gold??? I am faced with a solution more than 1000ml of gold and addition of SMB precipitate some brownish residue at the bottom but solution still very positive for gold. If I do steam bath at this point will I lose value? I don't think i added this much nitric to the solution in dissolving process.

Brown foams forming after addition of SMB to solution


Stannous result for the same solution after addition of almost 100 grams of SMB!!




Regards,
Kevin