Old Electronics May Hide 22-Carat Gold

Swiss scientists have discovered that discarded electronic devices—especially computer motherboards and circuit boards—contain valuable amounts of gold that most people unknowingly throw away. Researchers at ETH Zurich found that around 20 discarded motherboards can yield about 450 milligrams of 22-carat gold using a new eco-friendly extraction technique.

The process uses whey protein, a by-product of cheese production, which is converted into a sponge-like material capable of binding with gold ions extracted from dissolved electronic components. When heated, the captured metal forms a 22-carat gold nugget weighing roughly 450 mg, with about 90.8% purity.

Scientists say the approach could transform electronic waste recycling by reducing reliance on traditional mining methods that use toxic chemicals such as cyanide or mercury. Globally, electronic waste is one of the fastest-growing waste streams, with about 62 million tonnes generated in 2022, yet only 22.3% of it was formally collected and recycled, meaning large quantities of valuable metals are lost.

Researchers believe this sustainable technique—developed using water, moderate heat and natural proteins—could make e-waste recycling both environmentally safer and economically viable while turning discarded gadgets into a potential “urban goldmine.”

Source: Dairynew7x7 12th March, 2026 Get full story here

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