glorycloud
Well-known member
Um, is it industry standard or forum standard to handle hot acids without protective gloves on? :shock:
Help with heavy Gold top CPUs
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kernels
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Owltech said:
Nice analysis and yields there Owl, appreciate you sharing them.
No hate in my post Sam, just simple straight forward facts. I actually like you very much Sam. 
Your methods will work, but they will have the deficiencies that I pointed out, not to be hateful, but to provide the forum with as much information on the subject as possible. Anyone interested in maximizing their recovery returns in silver, gold, and tungsten from any cpu with an integrated tungsten/copper heat spreader will benefit from my suggestions. As a generalized comparison, you can run 10kt and 14kt jewelry in AR directly and recover gold, but you will have issues with the silver chloride formation that will have to be dealt with. Alternately you can inquart the karat scrap and recover all of your values. Both methods recover gold, one just does it more efficiently.
For me it is easier and a more efficient use of my time to remove the tungsten from the reaction prior to digesting the Au. The pure tungsten plates and recovered silver from the braze are commodities that can be sold that adds to your profits.
Steve
Your methods will work, but they will have the deficiencies that I pointed out, not to be hateful, but to provide the forum with as much information on the subject as possible. Anyone interested in maximizing their recovery returns in silver, gold, and tungsten from any cpu with an integrated tungsten/copper heat spreader will benefit from my suggestions. As a generalized comparison, you can run 10kt and 14kt jewelry in AR directly and recover gold, but you will have issues with the silver chloride formation that will have to be dealt with. Alternately you can inquart the karat scrap and recover all of your values. Both methods recover gold, one just does it more efficiently.
For me it is easier and a more efficient use of my time to remove the tungsten from the reaction prior to digesting the Au. The pure tungsten plates and recovered silver from the braze are commodities that can be sold that adds to your profits.
Steve
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lazersteve said:
Hi Steve
I'll try a batch your way this weekend. Always up to try a new method. Let me know what strength of Nitric you class as dilute for these purposes please would you? My raw Nitric is 67% so what would I add?
Thanks in advance
Jon
Jon, an equal volume of water will work just fine.
Be sure to remove grease, stickers, bottom lids, and components so they don't end up in your foils.
Be sure to remove grease, stickers, bottom lids, and components so they don't end up in your foils.
kernels
Well-known member
anachronism said:
Let us know how it goes Jon, I have processed all of them for now, but will be doing future batches Steve's way.
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Steve thanks
How do you recommend removing bottom lids if you're keeping the tops in one piece?
How do you recommend removing bottom lids if you're keeping the tops in one piece?
I use a set of front cutters with a modified bite so that one point of the bite hits about halfway from the center of the lid to the edge of the lid on kovar lids. The second point of the cutter is ground off. This tool doubles as a mmlc remover. I will dig up pictures of my custom tool made from a 8" pair of front cutters.
For ceramic bottom lids a couple gentle taps with a small hammer will fracture the lid only so the lid debris can be dumped out when the cpu is flipped. You don't have to clear the ceramic around the edge, just expose the core to the acid so it can work on the die side. You will find several cpu types (Orions and similarly constructed) that the spreader is brazed directly to the die with gold alloy.
I have a whole series of pictures on an old phone I will dig up for clairity.
Steve
For ceramic bottom lids a couple gentle taps with a small hammer will fracture the lid only so the lid debris can be dumped out when the cpu is flipped. You don't have to clear the ceramic around the edge, just expose the core to the acid so it can work on the die side. You will find several cpu types (Orions and similarly constructed) that the spreader is brazed directly to the die with gold alloy.
I have a whole series of pictures on an old phone I will dig up for clairity.
Steve
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A little "left field" but I ran some procs using this pre soak in weak Nitric over the weekend. Normally these particular lids pose a problem but as you can see they now don't.
A point to note - the legs also came off very easily after this treatment with just a light brush with a gloved finger. I like this. It meant I didn't have to put the lids through processing.
A point to note - the legs also came off very easily after this treatment with just a light brush with a gloved finger. I like this. It meant I didn't have to put the lids through processing.
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Jon,
You should try the process on some cpus with the tungsten heat spreader. These are the types of cpus where this method really shines as you will recover the Ag from the braze as well as the tungsten from the spreader.
Steve
You should try the process on some cpus with the tungsten heat spreader. These are the types of cpus where this method really shines as you will recover the Ag from the braze as well as the tungsten from the spreader.
Steve
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Aye I'll do that. This batch didn't have any in- oh and the yield from those procs above made my eyes water....
Owltech
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lazersteve said:
I have to admit your method gave the best yield on Pentium Pro 256k CPU: 0.35g Au (although this could have been just a coincidence)
Pentium Pro 256k ceramic CPU - gold recovery methods tried so far:
smelting 0.31g Au;
de-soldering and AR 0.32g Au;
HNO3, AR, de-soldering, AR 0.35g Au
