How to Remove Gold from Circuit Boards

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Easy ways to remove gold from circuit boards
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If you’ve opened an electronic device before, such as radios, televisions, or even your old cellphone, you’ve seen their inner workings. Ever noticed those shiny gold-colored parts on the circuit boards? Those bright pieces of metal are, in fact, gold. Gold is used on electronic circuit boards because of its excellent conductive properties and because it doesn’t corrode or rust over time. If you still have any of those circuit boards lying around, have a bit of fun and mine them for gold. [1]

Method 1
Method 1 of 2:

Removing Gold Using Nitric Acid

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  1. Be sure to wear a face mask, safety glasses, and industrial gloves. Chemicals and acids can irritate or even burn through your skin. Fumes from burning acids can also hurt your eyes and cause nausea when inhaled. [2]
  2. Nitric acid is a clear liquid chemical commonly used for various industrial, steel, and wood works. You can purchase nitric acid from industrial or chemical shops. [3]
    • In some states and countries, however, you might be prohibited from buying nitric acid or you might have to meet certain standards before you’re allowed to purchase it. Check with your local authorities before purchasing. [4]
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  3. The container should preferably be Pyrex glassware or the kind that can withstand extreme heat. [5]
    • Break the circuit boards into smaller pieces before you put them in the glass container.
    • Do not use plastic containers as the acid might burn right through it.
  4. As you put the acid in, burning fumes will start to come out of the container, so make sure you’re wearing protective gear.
  5. Since gold requires stronger chemicals to be dissolved, the nitric acid will melt all the plastic and metal parts of the circuit board without harming the gold bits. [6]
  6. Use a filter to separate the solid parts from the liquid.
  7. These parts will have the gold. Some plastic may still be attached to the gold, so you need to separate these little bits off the gold yourself. Be sure to use industrial strength gloves when you do so.
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Method 2
Method 2 of 2:

Removing Gold Using Fire

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  1. Be sure to wear a face mask, safety glasses, and industrial gloves to avoid breathing in the fumes released by the burning plastic. Use steel tongs to turn over the burning circuit boards.
  2. Break the boards into smaller pieces so they burn faster.
  3. Pour a bit of gasoline over the pieces to put the pieces on fire. Turn the burning pieces over using steel tongs, and wait until the boards are burnt black.
  4. Allow the pieces to cool down a little—just warm enough so you can touch them, but not too cooled down that the plastic hardens again.
  5. The burning process should have made the board materials brittle and easy to break.
    • To be safe, wear protective gloves when breaking off the plastic.
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  • Question
    Do cell phones have gold in them?
    wikiHow Staff Editor
    Staff Answer
    This answer was written by one of our trained team of researchers who validated it for accuracy and comprehensiveness.
    wikiHow Staff Editor
    Staff Answer
    Yes, most cell phones have gold in them. Places where gold may be found in a cell phone include the speakers (gold plated parts), the circuit board and small parts such as gold-plated connector pins and capacitors.
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  • Question
    How much is the gold in a cell phone worth?
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    Staff Answer
    This answer was written by one of our trained team of researchers who validated it for accuracy and comprehensiveness.
    wikiHow Staff Editor
    Staff Answer
    This depends on the amount of gold in the phone but a rough estimate is around USD$1 to USD$2 per phone. While it may not seem like much, by the time a gold recycling company has a ton of phones, that adds up to a lot of gold. For example, Sims Recycling Solutions North America recycled 167 ounces of gold from used cell phones in 2014, the equivalent of about 789 gold medals (Silverberg, 2017).
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  • Question
    Where are the precious metals in a computer?
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    Staff Answer
    This answer was written by one of our trained team of researchers who validated it for accuracy and comprehensiveness.
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    Staff Answer
    Precious metals are found in a number of places in a computer, including the printed circuit board, the CPU (computer chip), the hard drive, the capacitors, the connectors, etc.
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      Warnings

      • Burning plastics can cause severe lung and environmental hazards, so do the process with extreme caution and consideration for others.
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      • Handle acids and chemicals with extreme care. Do not ever touch them with your bare hands to avoid severe chemical burns.
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      • Use acids and chemicals in a well-ventilated area to avoid inhaling the fumes.
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      • Dispose of the chemicals properly. Take the used acid to recycling plants.
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      • Take the burned plastic remains of the board to recycling plants in your area to dispose of waste properly.
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      References

      1. ↑ https://sustainenvironres.biomedcentral.com/articles/10.1186/s42834-022-00118-x
      2. ↑ https://electronicshacks.com/how-to-extract-gold-from-electronics-without-chemicals/
      3. ↑ https://electronicshacks.com/how-to-extract-gold-from-electronics-without-chemicals/
      4. ↑ https://electronicshacks.com/how-to-extract-gold-from-electronics-without-chemicals/
      5. ↑ https://electronicshacks.com/how-to-extract-gold-from-electronics-without-chemicals/
      6. ↑ https://electronicshacks.com/how-to-extract-gold-from-electronics-without-chemicals/

      About This Article

      Article Summary X

      To remove gold from circuit boards, start by purchasing concentrated nitric acid from an industrial or chemical store. You’ll also need a face mask, safety glasses, and industrial gloves to work with nitric acid, since it can harm your skin and eyes and cause nausea if it’s inhaled. Next, break the circuit board into smaller pieces and place them inside a glass container. After putting on your safety gear, pour the nitric acid into the container and stir the mixture using a glass rod. Then, use a filter to drain the mixture and pick out the gold parts. For more tips, like how to remove gold using fire, read on!

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