The color of vaporized copper is one of the most beautiful you are likely to see ever seen and it can only be seen when you put copper -gold or not- into concentrated acid. Upon see-through and under sunlight, the colors that you see behind that vapor are all supersaturated and it's an evanescent phenomenon, gone in a fraction of a second -it's a unique effect, unfilmable, and that seems to never have been documented before. The meeting of acid and copper is explosive and that vapor is very, very toxic, but it's fantastic to look at especially under sunlight -trust me on it: avoid closed rooms for this. The "best method" is oldest, the way jewelers do it. Supposing iron is off the picture with an acid bath, melt metals together and put them through any one of these:
O.k., smaller versions exist even on other fields: these machines are the jewelry version of
You will be left with a very fragile-looking tin-foil like film. That is what goes into the concentrated acid, very very v e r y slowly... and later on you recover the dust from the bottom and melt it. That is the gold.
There are numerous specifics to this process that aren't quite fit for this space but any jeweler would tell you with plenty of details.
But is it cost-effective as far as recovered gold from electronic parts is concerned?
Not a chance. Only for jewelers, who actually collect their own trash so that any eventual dust gold in it can be recovered. (Remember a vat where three jewelers had to wash their hands before
they washed their hands every time they left the room, no exception. The water was changed every day multiple times, of course. From their hand's dusts they recovered about 30 grams of gold from the bottom of the vat after 3 years.)
Actually electronic scrap can be very profitable. Expescially if you have older type electronics from say 70's to early 90's, these electronics will have comparitavely very thick gold plating.
The way I would do it is first dissolve the copper and get rid of it, leaving the gold plating for your aqua regia solution. But I wouldn't start doing this unless I have like a 5 gallon bucket full of fingers, cpus, and pins and such other gold plated things.
But I have heard yields as high as half an ounce out of a 5 gallon bucket, so its definately doable. The most I have gotten out of a bucket was 4 grams 99.9% pure gold. But I had pretty crappy scrap this guy sounds like he has the good stuff.
8th January 2011 - 11:16 AM
Keep It Up.
17th December 2012 - 07:30 AM
A senseless obsession.
Some experts argue that we shouldn't have to mine new gold at all: We just need to let go all the shiny stuff we're hoarding. In 2008, it was estimated that 157,000 tons of gold had been mined throughout history -- and that individuals were sitting on a whopping 104,000 tons of it, in the form of bullion, coin and jewelry. So the best way for you to mitigate the impacts of gold-mining might be to make a personal pledge to keep gold in circulation. Try instituting a one-in, one-out policy for your jewelry box: Whenever you want to buy a piece of gold jewelry, take one you already have and sell it, or melt one down for refabrication. Do that, and you can glitter relatively guilt-free. http://www.washingtonpost.com/wp-dyn/conte...0092004730.html
18th December 2012 - 10:25 AM
We already have too much.
20th December 2012 - 10:25 PM
QUOTE (Capracus+Dec 18 2012, 05:25 AM)
We already have too much.
We?? Who exactly is we?? You can give us some because "we" don't have enough lol.
World governments like to keep their gold locked up and good luck bringing that gold into circulation!!
You know I went through this process with some of my electronics... I got more than I thought! I got almost half an ounce from almost a full 5 gallon bucket of gold plated electronic scrap.
12th April 2013 - 01:08 AM
Yes, HCl mixed with H2O2 can dissolve gold
A tip on making concentrated HCl, add FeCl3 to your dilute HCl and now you can concentrate it by distilling, even if it is very dilute to start.
12th April 2013 - 12:43 PM
what's an average cost for one of these home smelting kits ?
PhysOrg scientific forums are totally dedicated to science, physics, and technology. Besides topical forums such as nanotechnology, quantum physics, silicon and III-V technology, applied physics, materials, space and others, you can also join our news and publications discussions. We also provide an off-topic forum category. If you need specific help on a scientific problem or have a question related to physics or technology, visit the PhysOrg Forums. Here you’ll find experts from various fields online every day.
To quit out of "lo-fi" mode and return to the regular forums, please click here