Step 6: Filtering the Gold Foils.

Items required
  • coffee filters
  • filter holder
  • 60oz pickle jar. or glass container large enough to contain waste acids.

Simply Poor the contents of the two gallon bucket into the pickle jar using the coffee filters to catch any foils that are floating on the surface of the acid. Once you have pored off all the acid you will be left with a pile similar to what is in the picture.  scoop these from the bucket into another container for future processing.

Congratulation you are about 50% finished. **********   

************************************* HEALTH WARNING ***************************************

Melting at this stage may lead to the following health hazards.

Inhalation of zinc oxide fumes can occur when welding or cutting on zinc-coated metals. Exposure to these fumes is known to cause metal fume fever. Symptoms of metal fume fever are very similar to those of common influenza. They include fever (rarely exceeding 102o F), chills, nausea, dryness of the throat, cough, fatigue, and general weakness and aching of the head and body. The victim may sweat profusely for a few hours, after which the body temperature begins to return to normal. The symptoms of metal fume fever have rarely, if ever, lasted beyond 24 hours. The subject can then appear to be more susceptible to the onset of this condition on Mondays or on weekdays following a holiday than they are on other days.


Beryllium is sometimes used as a alloying element with copper and other base metals. Acute exposure to high concentrations of beryllium can result in chemical pneumonia. Long-term exposure can result in shortness of breath, chronic cough, and significant weight loss, accompanied by fatigue and general weakness.


Mercury compounds are used to coat metals to prevent rust or inhibit foliage growth (marine paints). Under the intense heat of the arc or gas flame, mercury vapors will be produced. Exposure to these vapors may produce stomach pain, diarrhea, kidney damage, or respiratory failure. Long-term exposure may produce tremors, emotional instability, and hearing damage.


Inhalation and ingestion of lead oxide fumes and other lead compounds will cause lead poisoning. Symptoms include metallic taste in the mouth, loss of appetite, nausea, abdominal cramps, and insomnia. In time, anemia and general weakness, chiefly in the muscles of the wrists, develop. Lead adversely affects the brain, central nervous system, circulatory system, reproductive system, kidneys, and muscles.


Cadmium is used frequently as a rust-preventive coating on steel and also as an alloying element. Acute exposures to high concentrations or cadmium fumes can produce severe lung irritation, pulmonary edema, and in some cases, death. Long-term exposure to low levels of cadmium in air can result in emphysema (a disease affecting the ability of the lung to absorb oxygen) and can damage the kidneys. Cadmium is classified by OSHA, NIOSH, and EPA as a potential human carcinogen

Disposing of your waste acids.

Place your acid in a separate container, I choose used 2 liter or 3 liter bottles,   Label these bottles as CLCu2 with a black sharpie marker. under that write may also contain trace amounts of NICKLE and ZINC, BERYLLIUM, CADMIUM and LEAD.   You can take these items to your local hazard roundup or recycle your acids with a method I plan on detailing in another instructable.

DO NOT dump your acids down the drain or on the ground.  it is IMPORTANT to be responsible with wastes.

Will this work with gold on magnetic based parts ? <br>I have some old glass resistors from 70's, a few pounds anyway, I'd like to know before I mess it up.
No, ferrous metals will vastly reduce the effectiveness of chemical bath 1, the resulting pulp will not re-precipitate any gold I'm the final step. For magnetic conductors use Aqua Regina.
Really interesting procedure (never seen anything like this). Can you use the same procedure for pins containing gold? Can I use potassium metabisulfite instead of sodium Bisulfite (i cant find any)?
sodium bisulfite aka baking soda right? <br>
baking soda is sodium bicarbonate<br>
no baking soda is calcium carbonate. and yes you can use pottassium metabisulfite.
<p>lol, not exactly, Folks, Baking soda is sodium bicarbonate. Calcium carbonate is chalk, dolomite, and many other things. Just because it has a Sodium or a carbonate in the name does not make everything baking soda. Anyone attempting this procedure really needs to know the difference, if you don't, then you need to do a little research until you do, otherwise you might nerve gas yourself or blow yourself up. If you're not familiar with chemistry, google solutions, reactions, precipitating metals and salts out of solution, chemistry safety procedures, molecular bonds, ions in solution, MSDS Safety information for every chemical you use or make. This is a process that requires some knowledge about what you're doing, it won't work if you don't, or it will backfire on you. Do your homework and you will have success, if you don't do your homework you will fail, so start googling :O)</p>
Lol Doug I tried to heat pyrex and make nitric I was out side pirex broke floor full of acid
baking soda is actually sodium bicarbonate NaHCO3 calcium carbonate is CaCO3 which is a lime not baking soda
aka ph down? <br>
<p>no, see above</p>
<p>no, not even close to the same chemical, baking soda is sodium bicarbonate</p>
<p>If you don't know the difference between baking soda and sodium bisulfite, you need to keep away from all chemical compounds. </p>
That shouldnt be an issue. Instead of creating sodium chloride. You would create potassium chloride the resulting exchance. Should create so2 gas. Lol give it a try, just dont hold your face over the beaker if you added distilled water ..
Smelled chitty<br>
You may want to clarify in step 5 that it is the circuit board fingers not yours. ...there are those people out there who will put their fingers into acid...
<p>You are a funny man/woman Guitar_Player guy person you! :-D</p>
Bahahaha!!!! Right?!?!
<p>I even filtered the gold and diluted it. About 50 ml of 50% of 1 g of EDTA was added to double the gold solution (filtered and decanted).</p>
<p>I have done test with EDTA ph 8 with ammonia and ammonia chloride and sea salt and test dissolved partly neutral gold at a ph (solution of 4). It turned yellow gold indicating that there was no nickel or other metals just gold. Another link said that 95-99.99% of cell phone cpu are gold with little lead, nickel, etc. If it was lead it would have turned I think white, Nickel (Purple), Chromium (Purple Cr3+), etc. I may buy on e-bay a very percise nickel test for liquids.</p>
<p>I am sorry about this question but I need to know. Just how many, let's say, SDRAM chips, would it take to pay for all of the equipment &amp; materials (including chemicals), just to get started? Allowing you enough pre-purchased equipment &amp; materials to use in the recovery of more gold at a profit. A close guesstimate will do fine.</p>
<p>the ratio I saw was around a gram per pound of fingers + boards.</p>
<p>In other words, people sell the scrap for way more than it is worth gold-wise, you'd need to find the scrap for 35-45 a pound max in order to make any money from the gold recovery effort if you were purchasing the scrap.</p>
<p>it is simple but for mor safty use dillute hydrochloric acid till 17%</p>
<p>good work</p>
<p>I have an antique gold plated cane handle. Will the process work for this item?</p>
<p>my first liquid was blue.what is my problem?</p><p>and what should i do with the deposit of it?</p>
I will help you<br>Contact me on WhatsApp<br>00923136437898<br>Yasir Bashir
<p>Hello Sir can this work for all CPUs ?...cause I have about 10kg of Computer CPUs</p>
<p>Hello Ubong01</p><p>can u give me details of cpu kinds, you have<br>you can e-mail me iftikharcomputer@yahoo.com</p>
<p>How do you recover the copper from the HCL, hydrogen peroxide and copper solution?</p>
<p>Just put a stainless steel butter knife in the solution for a couple of days. The copper will cement to the steel. Pull it out and rinse it off. Then you have pure copper.</p>
<p>Okey, I add SMB to the ''Yellow solution that contains gold'' and it went collorless, I left it over the night and nothing. What I should do now?! Did I add too much SMB, or it is because I need to heat it ? Please help. Thanks. </p>
<p>who can tell me where I can find those acids?</p>
Pool acid will do the trick.
Would it be viable to use a 66% acid as opposed to the 34%? If have both but I'm not sure if the 66% would be too strong?
Lol... *dumps acids down drain* realizes he has metal pipes still... *pipes disappear*
I got two of 155 gram of melted cpu pins. Can i still use this process? Also i couldnt find klean strip muriatic acid, is 37% hcl from lab company ok?
Bom dia amigos estou precisando de ajuda para extrai ouro de placa dedos e processadores porem se possivel de agua regia um passo a passo com todos os quimicos.<br>Att.claudio
<p>this is should be fun, I'av made some collection. but looking a safe way of doing it.</p>
<p>I'm confused. My understanding was that only AR can dissolve gold. You are saying that gold can be dissolved with HCL and Clorox? I thought nitric acid was required?</p>
<p>bonide stump out is smb it is just coled by an name they used years ago. smb is not sodium bicarb &quot;baking soda&quot; i should know i am a patented publised scientist.</p><p>Ron Donahue and pk11195, patents BS/MS/MDs/PhD</p>
<p>I did all steps, tests were good, when melted I got glass not gold. please help</p>
You mentioned putting 3G of flakes into the solution... what was the weight of 24K gold of the finished product? Thank you for your time. ?
Help !!!! When i added some of smb the solution become clear and no ppt although solution contain gold
<p>Hello there, Can I use Sodium bisulfate NaHSO4 instead of Sodium Metbisulfite MBS (Na2S2O5)?</p>
<p>According to the MSDS, Bonide Stumpout is sodium metabisulfite, which is NOT the same compound as sodium bisulfate, but you are correct - sodium bisulfate cannot be substituted for Stumpout. Clorox bleach is sodium hypochlorite; sodium hypochlorate does not exist. </p>

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Bio: I eat food, sometimes I'm funny.
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