Pyrometallurgy: Roasting, Smelting, Refining & Electrowinning

Pyrometallurgy: Roasting, Smelting, Refining & Electrowinning2017-04-21T02:33:06-04:00
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What is better for e-waste gold recovery, CPU's or gold connectors and pins? (5 replies)

Moonglow
7 months ago
Moonglow 7 months ago

I'm trying to figure out which has greater yield of gold in general.

SmartDog
7 months ago
SmartDog 7 months ago

Well the connectors and pins will have a higher gold content then CPU's, but will probably cost more as they have been partially processed already.  And yes you will be buying them based on the estimated metal content.

Moonglow
7 months ago
Moonglow 7 months ago

Thanks. Actually, I'm getting them for the same price. What about pins vs. older CPU's, like 1970's and 80's chips?

Moonglow
7 months ago
Moonglow 7 months ago

Take the specs on the Pentium Pro. Depending on the plant they were made at etc., gold content is between .3 and .5 grams. Weight of the entire chip is 89 grams. So that's .006 percent of the weight, assuming .5 grams. 

Are the typical weights of pins better percentage wise? I would think so, but I have no experience with pins. What is the typical gold content of pins, by proportion as in the above example?

On the plus side, sometimes you find vintage chips which are worth more to collectors than the gold weight, but they are few. That's why I'm considering pins and connectors.

Moonglow
7 months ago
Moonglow 7 months ago

FYI, I did a spread sheet and some research, you really just have to calculate this stuff. It appears that pins etc yield between 2-6 grams per pound, so that's a really big spread. So basically you just have to roll the dice on pins. But they beat most CPU's except the very high yielding ones. I also analyzed the the percentage of gold in typical chips vs the average pins, very interesting. Intel I960 yield only .67%. The Cyrix Cx486 is only .52%! These are older supposedly "high yielding" chips. So it turns out that older is not necessarily better. Although the Pentium Pro (the most scammed chip in the biz) will yield as high (arguably) 1.12% in gold.

You really have to do the math: gold /total weight= percentage. This is important because you often buy this by the batch/weight. So same weight gets you more smaller chip vs. less bigger chips. So in this case size or even age doesn't really matter. You just have to know what you're buying, experience with it is even better.

To the pin question, the average (4 grams per pound) gauging from the above 2-6 grams figure, would yield .88% in gold. While 2 grams gets you a miserable .44%. BUT, 6 grams yields you a whopping 1.31% in gold! Better than just about any non super vintage chip out there. So like I said, a roll of the dice.

Moonglow
7 months ago
Moonglow 7 months ago

But good answer SmartDog, I just really wanted to know the math!

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