Why Electronics Contain Gold
Gold is widely used in electronics because it conducts electricity extremely well and resists corrosion.
Manufacturers plate thin layers of gold onto electronic components to ensure reliable electrical connections.
Common electronic items containing gold include:
• computer processors (CPUs)
• RAM memory modules
• motherboard connectors
• circuit boards
• expansion cards
• communication equipment
Although each device contains only a small amount of gold, large quantities of electronic scrap can contain significant recoverable precious metal.
Types of Electronic Scrap That Contain Gold
Not all electronic scrap contains gold in meaningful amounts. Refiners typically focus on components with the highest gold content.
Gold Plated Connectors
Many connectors used in computers and networking equipment contain gold plating.
These include:
• edge connectors
• card slot contacts
• ribbon cable connectors
• communication port contacts
These parts are often called gold fingers.
Computer Processors (CPUs)
Older computer processors often contain significant gold plating and internal bonding wires.
Ceramic CPUs from older computers typically contain more gold than modern processors.
Memory Modules (RAM)
Memory sticks frequently contain gold plated edge connectors that can be processed for recovery.
Circuit Boards
Circuit boards contain very small amounts of gold in contact points and microchips.
However, recovering gold from boards requires more processing and may produce lower yields.
Preparing Electronics for Gold Recovery
Before refining begins, electronic scrap must be prepared.
This preparation usually includes:
• separating gold plated connectors
• removing large steel or aluminum parts
• cutting gold fingers from circuit boards
• sorting materials by type
Removing unnecessary materials helps improve refining efficiency.
Dissolving Gold from Electronic Scrap
Once the gold-bearing components have been separated, the next step is dissolving the gold.
One of the most common chemical methods used by small-scale refiners is aqua regia refining.
Aqua regia is created by combining nitric acid and hydrochloric acid.
When applied to gold-bearing material, the solution dissolves the gold and forms gold chloride in liquid solution.
During this step refiners typically use:
• nitric acid substitute
• hydrochloric acid
• glass beakers
• proper ventilation and safety equipment
Once the gold dissolves, the remaining solids can be filtered out.
Filtering the Gold Solution
After dissolution, the refining solution will contain dissolved gold along with other impurities.
Filtering removes:
• plastic debris
• base metals
• undissolved solids
Clean filtration ensures the solution is ready for the next step of the refining process.
Neutralizing Excess Nitric Acid
Before gold can be recovered, excess nitric acid must be removed.
If nitric acid remains in solution, precipitation will fail.
Refiners commonly neutralize nitric acid using chemicals such as:
• sulfamic acid
• urea
This step prepares the solution for successful gold recovery.
Testing the Solution for Gold
Before recovering gold from the solution, refiners confirm that gold is present.
The most common method uses stannous chloride test solution.
A drop of stannous chloride added to the refining solution will produce a purple or dark reaction if gold is present.
This confirms the refining process is working correctly.
Precipitating Gold from Solution
Once the solution has been properly prepared, the dissolved gold can be recovered.
Refiners typically add sodium metabisulfite, also called gold precipitant.
When added to the gold-bearing solution, this chemical causes the dissolved gold to fall out of solution as fine brown powder.
The powder slowly settles to the bottom of the container.
Washing the Gold Powder
After precipitation, the gold powder should be washed several times with clean water.
This removes remaining chemicals and impurities.
Proper washing improves the purity of the final gold.
Melting Recovered Gold
Once the powder has been washed and dried, it can be melted into a solid metal button.
Refiners typically melt the powder using:
• a crucible
• borax flux
• a high-temperature furnace or torch
The molten metal can then be poured into an ingot mold to form a small gold bar.
Is Recovering Gold from Electronics Worth It?
Gold recovery from electronics can be rewarding, but it requires:
• proper equipment
• chemical knowledge
• patience during the refining process
Large quantities of scrap are usually required to recover meaningful amounts of gold.
However, for refiners and hobbyists, electronic scrap remains one of the most accessible sources of recoverable gold.
Recommended Gold Refining Supplies
If you're refining scrap gold, jewelry, or electronic components, using the correct chemicals and fresh reagents is critical for consistent results. These supplies are commonly used in the aqua regia gold refining process.
Hydrochloric Acid for Aqua Regia