This gold-mining method can extract precious metals from discarded central processing units (CPUs) in old mobile phones and computers and printed circuit boards (PCBs) removed from home appliances through chemical washing in less than 20 minutes.

It achieves over 98.2 per cent gold leaching efficiency from waste CPUs and PCBs at room temperature, along with a 93.4 per cent extraction rate for palladium while producing much less pollution than traditional methods.

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