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++++ John, I am afraid those units only extract dollars from amateur buyers. Pure scrap gold only require melting, so perhaps you wish to recover gold from scrap computers, etc. The highly hazardous liquids that dissolve gold also dissolve other metal present. 12 V will plate out all the metals together (Ag, Cu, Fe, Ni, Pb, Sb, Sn, Zn, etc.) and dissociate water into an explosive mixture of hydrogen and hydrogen. I suggest reading The Recovery And Refining Of Precious Metals - 2nd Edition Professional gold platers use ion exchange columns and sophisticated plating units to concentrate and plate gold from high purity gold plating rinses, not scrap. See Letters #4215 and #17942. The "Gold Bug" is a well-known electrolytic recovery unit sold by Precious Metals Processing Consultants, Inc. Concentrations too dilute for economical plating are captured by ion exchange resins, which are usually sent to a refiner/supplier such as Technic.
++++ Hello, Saw the first answer you got, and that is not true at all if you follow the instructions. This process is not for nuggets, solid gold jewelry, but for plated scrap. I will build you a machine, and I carry the chemicals that you need for (scrap) refining. The machine sells for $75.00 and comes with enough chemical to make 2 gallons of solution, and with the purchase, you get unlimited e-mail tech support. This system does work. I have sold hundreds of these machines and get production reports every day. In fact, as long as you follow the instructions to the "T" I will guarantee success, that you will recover gold. I do, so with me helping you at every turn why can't you! William L. |
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It would not have been fair to print someone else's discouraging critique and refuse to print your rebuttal, Bill, so we printed it. But it also would not be fair for you to be advertising your product here while asking your competitors to pay your advertising costs. So we can't print your contact info here or refer any readers to you. Thanks for your understanding.
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Mr. Vlach is mostly correct in stating the level of complexity to
recover gold. However, he mentions techniques while well known in the
marketplace are also substandard to higher yield processes. Chemical
extraction of electroplated materials (i.e. scrap metals or
assemblies containing gold) can be highly successful. I have
witnessed yield differentials (over burning) as high as 30%+. That is
rather significant when at today's gold price a 1% yield delta
amounts to $.06 per lb of low grade material such as scrap.
Platers do not have to rely on ion exchange resins to capture (low
concentrates not high purity as Mr Vlach suggests) Plating rinses
containing gold ions are typically in the mgs/l range. Resins must be
burned to retrieve the gold. There are chemical processes that can do
just that without the losses incurred in burning.
Arthur Simpson PE
- York, PA, USA
This thread is getting a bit confusing, combining as it does the question of recovering gold from scrap with recovering gold from plating rinsewater, which are two different things. But as for recovering gold from rinsewater . . .
The two technologies that I'm familiar with are electrolytic recovery and ion exchange. Electrolytic recovery is a great technology for a stagnant dragout tank, but loses efficiency at low concentration and becomes impractical in a final rinse where gold concentration is a couple of parts per million. Ion exchange is ideal for a final rinse because it can recover gold even in the ppm range, from a continuously flowing final rinse, while giving the ware a final stain-free rinse in DI water.
So , what I don't understand Bill, is where chemical recovery fits in. Do you continuously dose the final rinse with precipitant chemical and continuously filter it? If not, how does the gold not go down the drain? Thanks.
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 Ted Mooney finishing.com Brick, New Jersey |
HI, ONE OF THE BEST WAY TO REMOVE GOLD FROM SOLID PLATED ARTICLES IS TO MAKE THE PIECE ANODE AND USE STAINLESS STEEL AS CATHODE IN THE VERY CONCENTRATED SULFURIC ACID AND THE VOLTAGE HAS TO BE BETWEEN 7.5 VOLTS TO 12 VOLTS. GOLD IS NOT SOLUBLE IN SULFURIC ACID BUT AS SOON AS THE VOLTAGE IS APPLIED THE ACID SURROUNDING THE ANODE TURNS INTO PERSULFURIC ACID IN WHICH GOLD IS SOLUBLE.AS SOON AS THE ION GOES INTO SOLUTION IT AGAIN BECOMES SULFURIC ACID AND GOLD FALLS TO THE BOTTOM.AS SOON AS THE GOLD IS DISSOLVED YOU WILL NOTICE A SHARP DECREASE IN CURRENT BECAUSE AN OXIDE FILM IS FORMED ON BASE METAL.THIS IS THE TIME TO TAKE OUT THE ARTICLE.I HOPE THIS WILL HELP.
SINCERELY,
OPINDER SINGH
- Windsor, Ontario, Canada
I found this forum for scrap gold refining and recovery.
goldrefining.110mb.com/phpBB2/index.php 
Steve Johnson
- denver, co USA
I have a somewhat related question on recovery. I have aquired
many pounds of scrap jewelry that I'd like to recover. I have tried
just melting it down with an oxy/acetyl torch as well as propane. An
interesting thing started to happen: whatever other metals are in the
jewelery beaded up and melted off leaving a fairly solid nugget of
what appears to be fairly pure gold. Has anyone ever tried melting
gold at it's melting point of roughly 1065c and then letting it cool
very slowly so that the other metals can solidify at their respective
melting points? (for example if you took pure nitrogen gas and a cupe
of water, put them in a tank and slowly cooled it down, you'd
eventually have an ice cube floating in liquid nitrogen... in
theory)
Also, any other ways (short of smelting, I don't have a furnace large
enough to process the many pounds of scrap I have.. again not plated,
I suspect it's either "filled" / or of the 12-14k alloy range)
Thanks for letting me "think out loud", I'd greatly appreciate any
feedback.
Derek
Derek Nicarry
- Merrimack, New Hampshire
Dear Ted,
While it is true that at lower concentrations electrolytic recovery
can be less effective, I have great experience in this field, having
invented the Gold Bug system and can tell you that this system can
often recover metals to a fraction of a ppm. A company that used our
system for copper recovery reported that they were able to bring the
copper concentration from 2 ppm to 50 ppb!
Sincerely,
Randy Epner
Precious
Metals Processing Consultants, Inc.
- Palisades Park, NJ
To Derek in NH,
What you have accomplished is a crude process called parting. It was
used long ago to separate noble metals especially scrap containing
copper, gold, and silver. When you have more active metals involved
say zinc or lead, you tend to drive off those metal as vapor and the
atmosphere is important to assist in separation and prevent
oxidation. With the acetylene torch you probably had a reducing
atmosphere ( high CO:O2 ratio) which resulting in you producing the
"gold beads". This is an acceptable way to extract gross quantities
of precious metals, but you will let some of it get lost in the
residual materials.
As far as electolytic processes aqua regia and cyanide should not be
handled by the novice and not in your garage. You are better off
paying the refining charge to the recycler as it is safer do
something else with your spare time
Joe Sabatini
- Lexington, Massachusetts
Easy to exract from computer scrap fingers without nitric.
Use hydroloric and carbon electrodes in a vertical column. Add low
voltage, but watch your hydrogen production. will remove all but
platinum in about 24-48hrs.
I'm not going to step by step it... do your research
Ed Charini
- Dallas, Texas
Hi, I'm an 10th grade student interested in recovering gold from
circuit board fingers. I have access to about fifty old computer
units, but my father won't let me bring them home until I have a
"good safe plan" about to what to do with them. My friend told me you
can break the fingers off and dissolve alot of the debris away from
the gold with etching solution called ferrick chloride. Then he said
you can take what is left and heat it up in a thing called a crucibal
and that will make it a little bit more pure. Is any of this
information accurate? I would appreciate any help because I am very
interested in science and chemistry, but I need to convince my father
it is safe and worth my time before I bring all these computers home.
Thank you very much for your time.
--matt
Matt Lanese
student - Cleveland, ohio, USA
Ed. note: listen to your father, Matt --
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March 5, 2008 I too am looking in to equipment to separate Gold for
scrapping computers. I found a company on the web that has a
machine guarnteed to process computer gold to 99 percent
pure. George Cordell ---- |
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The quick alternate method for reclaiming PC board edge connectors
(only!) is as described ... ferric chloride, or any of the other
relatively benign printed circuit board etchants, is used to dissolve
the copper circuit board material while leaving the gold plating
intact, which simply falls off. You do have to dispose of the ferric
chloride, same as you would if you were etching circuit boards. There
is no such easy method for connector pins, integrated circuit leads,
etc.
You may also find that most scrap recovery places will pay a premium
if you bring them just the edge connectors from the boards (use a
table saw to cut the edge connector off the board). The gold plating
is typically 15 to 50 micro-inches thick, thicker on older equipment.
David Lane
- Santa Cruz, CA, USA
I would just like you to know that the Shor machine works very well I have used one for 3 years easy and safe if used out-doors.
Edward Dyke
- Pompano Beach, Florida, USA
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October 27, 2008 Hi, Edward. Thanks for taking the time to reply, but considering the relative anonymity of the internet, testimonials don't mean much. We can't vet the half million people who have posted on this site, and the next guy may say: "Shor is no good, brand blah-blah is much better" -- but the readers can't really be sure if you or him or both of you are neutral parties or even real people :-) Regards,
February 21, 2009 Easy answer: Please, kids, don't try this at home, including the student of 10th grade! For God's sake, mister, listen to your old man.. The extraction of scrap gold from e-waste needs the handling of extreme hazardous chemicals that may affect your health or put in risk your own life. If you have too much e-waste, please, save money, time and danger and send it to a professional refining (or extracting) company. In my city, there are some street peddelers that buy scrap gold, and it's a very good business...Realize that...here, the people used changes 18 or 14 kt gold broken jewerly for pans, pots, irons, big teddy bears also...Now, what is the cost of refining or extracting the gold of e-waste? I mean, the cost for ounce...do u recommend any company? Thanks. One Pablo
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