Gold and copper recovery technology developed by University of Edinburgh chemists uses reusable organic compounds to selectively extract precious metals from electronic waste under mild conditions.
Electronic waste represents one of the world’s fastest-growing hazardous waste streams, projected to reach approximately 93.5 million tonnes by 2030. Only about 20% undergoes recycling using environmentally sound methods. The remaining 80% ends up in landfills, incinerators, or informal processing operations, exposing workers and communities to toxic substances and permanently losing valuable materials.
Discarded electronics contain substantial metal wealth. Devices and printed circuit boards are rich in gold and copper. At current prices, the gold content in one tonne of typical e-waste exceeds US$46,000, with copper adding roughly US$2,000. This concentration makes e-waste effectively a high-grade “urban ore” rivaling conventional mining deposits in metal content per tonne.
Traditional e-waste processing relies on furnace smelting at temperatures above 1,200°C or on aggressive chemical leaching. Both approaches require enormous amounts of energy while generating hazardous emissions, toxic wastewater, and secondary pollution. Smelting operations release heavy metals and particulates into the surrounding environment. Chemical leaching frequently employs cyanide, mercury, and organic solvents, creating additional contamination risks for workers and ecosystems.
The Gold Copper Diamide Extraction process, developed by Professor Jason Love and Professor Carole Morrison in the University of Edinburgh’s School of Chemistry, replaces these destructive methods with low-temperature hydrometallurgy. Small, reusable organic ligands sequentially target metals under mild conditions, eliminating the need for cyanide, mercury, and organic solvent extraction entirely.
“Electronic waste is effectively a high-grade ‘urban ore,'” Professor Love explained. “Our goal was to design chemistry that can recover those metals selectively and safely, without the energy and environmental cost of smelting.”
The gold and copper recovery technology operates through a two-step selective extraction process. The diamide compound functions as a molecular magnet for gold, binding selectively to gold ions while ignoring other metals present in complex e-waste mixtures. Following gold extraction, a separate selective copper step recovers the second most valuable metal. This sequential approach achieves high purity for both metals while significantly reducing environmental impact compared with conventional methods.
Gold and copper recovery technology operates through a two-step selective extraction where diamide compound functions as a molecular magnet, binding selectively to gold ions while ignoring other metals in complex e-waste mixtures, followed by a separate copper recovery step achieving high purity for both metals with significantly lower environmental impact than conventional smelting and toxic chemical leaching methods. Photo by Random Thinking on Unsplash.
The University of Edinburgh licensed the gold and copper recovery technology exclusively worldwide to mineral processing company Lithium Universe in May 2026. The licensing arrangement, commercialized with support from Edinburgh Innovations, enables Lithium Universe to deploy and sub-license the technology globally as part of its expanding precious metals recycling strategy.
Lithium Universe plans to integrate the process into its Precious Metals Recycling Division alongside existing silver recovery technologies for end-of-life solar panels. This creates a comprehensive platform that addresses three high-value metals—gold, silver, and copper—from waste streams using clean chemistry rather than energy-intensive pyrometallurgy.
“This breakthrough from the University of Edinburgh reinforces the strategic expansion of our Precious Metals Recycling Division into high-value recovery technologies,” stated Executive Chair Iggy Tan. “By integrating selective metal recovery with sustainable processing, Lithium Universe strengthens its competitive position in circular-economy solutions for gold, silver, and copper recovery.”
The gold and copper recovery technology addresses the growing urgency around e-waste management. Global electronic device consumption continues to accelerate as populations grow and technology adoption expands. Smartphones, laptops, servers, televisions, and industrial electronics contain increasingly complex combinations of metals requiring sophisticated separation techniques for economic recovery.
Reusable organic ligands represent a critical advantage over conventional reagents. Rather than consuming chemicals in single-use reactions that generate secondary waste, the diamide compounds can be recycled through multiple extraction cycles. This reduces both operating costs and waste generation, improving economic viability while minimizing the environmental footprint.
Low-temperature operation eliminates the massive energy requirements of smelting. Processing at ambient or mildly elevated temperatures rather than above 1,200°C dramatically reduces carbon emissions per tonne of recovered metal. For an industry that processes millions of tonnes annually, this energy reduction translates into substantial greenhouse gas emissions savings.
Dr. Susan Bodie, Director of Innovation Development and Licensing at Edinburgh Innovations, emphasized broader significance. “This collaboration shows how fundamental chemistry can deliver practical solutions to global sustainability challenges,” Bodie stated. “By partnering with an industrial scale-up specialist, we can ensure this technology has real-world impact in the circular economy for electronic materials.”
The gold and copper recovery technology aligns with circular economy principles, gaining traction worldwide. Rather than extracting virgin metals through conventional mining, which involves habitat destruction, water contamination, and enormous energy consumption, urban mining recovers metals already in circulation. Each tonne of e-waste processed through clean chemistry reduces demand for primary extraction while preventing hazardous waste from entering landfills or informal recycling operations.
Informal e-waste processing in developing countries exposes millions of workers to toxic substances, including lead, cadmium, and brominated flame retardants. Children frequently participate in these operations, burning circuit boards and using acid baths without protective equipment. Scalable, clean recovery technologies could provide economic alternatives to these dangerous practices while maintaining livelihoods that depend on e-waste processing.
The licensing model enables rapid global deployment. Rather than building proprietary processing facilities, Lithium Universe can sub-license the gold and copper recovery technology to existing recyclers worldwide, accelerating adoption across diverse markets and regulatory environments.
As electronic device lifecycles shorten and global consumption increases, developing economically viable, clean extraction methods becomes essential for managing e-waste sustainably. The University of Edinburgh’s chemistry demonstrates that recovering precious metals from electronic waste need not replicate the environmental destruction of conventional mining and smelting, offering instead a pathway where waste streams become resource streams through molecular-level innovation.
