UK Royal Mint To Extract Gold From E-Waste

"The Royal Mint, which has produced coins since the 9th Century, has begun to recover gold from electronic waste as the use of cash has declined and fewer new coins are needed," writes Slashdot reader newcastlejon. "In 2022, construction began on a new site in Llantrisant, Wales. This facility will now be used to initially produce gold for jewelry and later for commemorative coins." The BBC reports: At the Royal Mint plant, piles of circuit boards are being fed into the new facility. First, they are heated to remove their various components. Then the array of detached coils, capacitors, pins and transistors are sieved, sorted, sliced and diced as they move along a conveyor belt. Anything with gold in it is set aside. The gold-laden pieces go to an on-site chemical plant. They're tipped into a chemical solution which leaches the gold out into the liquid. This is then filtered, leaving a powder behind. It looks pretty nondescript but this is actually pure gold -- it just needs to be heated in a furnace to be transformed into a gleaming nugget. "Traditional gold recovery processes are very energy intensive and use very toxic chemicals that can only be used once, or they go to high energy smelters and they're basically burnt," says Leighton John, the Royal Mint's operations director. "The groundbreaking thing for us is the fact that this chemistry is used at room temperature, at very low energy, it's recyclable and pulls gold really quickly." "Our aim is to process over 4,000 tonnes of e-waste annually," says Leighton John. "Traditionally this waste is shipped overseas but we're keeping it in the UK and we're keeping those elements in the UK for us to use. It's really important." The report notes that the UK is the second biggest producer of tech trash per capita, beaten only by Norway. According to the UN, e-waste is a rapidly growing problem, with 62 million tons discarded in 2022. That's expected to increase by a third by 2030.

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