Originally Posted by
rbrooks715
First picture un shredded computer cable ends, 2nd after shredding, 3rd look closely you might see some gold, 4th is the inside of the hammer mill that did the dirty work. After shredding I use a magnet to remove any iron. You could use a gold pan to remove the plastic and keep the wire for processing the gold, but I have other plans.<<
you do not remove the plastic prior to processing?
i was curious what your weight & volume ratios are. from raw connectors to milled material ready for processing.
processing time from connector to milled? pounds per hour/day? very interesting setup.
Yes everyone wants to know weights and returns, last year I had a 45 gallon drum and a 20 liter garbage pail full of connectors, using the large hammer mill it took less than 1/2 hour to shred.
The real work begins separating the wheat from the chaff, to process that lot the plastic was left with the pins. I added a dilute sulfuric acid which leached the copper out as copper sulfate leaving the gold to settle on the bottom of the pails as a powder.
Separating the plastic from the gold powder at this point was fairly easy,
Finely divided gold in powder looks like coco powder the color will vary depending on the gold content. The powder only takes on the color of gold once you re melt it into a bar or button.
You still have to refine that gold to get pure gold.
This year I decided to go with the copper cell, much less liquid wastes to deal with then I also believe I'm getting much better returns.
There are many different types of cells, since my anodes consist mostly of copper this is the type of cell I use the electrolyte consists of copper sulfate with a bit of sulfuric acid to make it more conductive.
When I cast the anode I add those junk gold plated pins which are at best considered low grade scrap into the melt along with some silver contacts still attached to the copper bars.
Had I used a torch to remove the silver contacts from the copper bars some silver would have remained on the copper, by running this through the cell I get it all back with out any loss.
After running a batch of silver contacts, the ones I collect from washing machine and dryer timers among other things my observation was that the hammer mill is doing the job.much better than I ever thought possible.
The elements involved, plastic, iron, copper, brass and silver, the parts are feed into the mill while making contact with the hammers, the plastic breaks into little pieces, the copper balls up he brass may ball up but mostly breaks into powder as will the silver
Sometimes the silver contacts just come loose from their mount then fall through the screen, but what I'm seeing is that the silver being so soft is being abraded into powder. The fact that the silver is being turned into powder will make it so easy to separate.
Last year from that barrel of plugs, once they had been shredded I ran the lot in a ball mill filed with water with a tad of soap. This was a very successful experiment, what I found was that the gold eventually abraded off of the pins after 12 hours run time, but not enough to cal the job a total success.
A shaker table would work to separate the heavier silver and gold from the plastic, or I could simply incinerate the lot.
I've choose to build this e-tower, there are no moving parts, plus I may have all the parts needed right here in my project pile.
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