Novel process extracts rare earth elements from waste
https://techxplore.com/news/2023-03-rare-earth-elements.html
"from coal fly ash using supercritical fluids including carbon dioxide, nitrogen and air"
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https://news.cornell.edu/stories/2023/10/metal-loving-microbes-savor-green-way-refine-rare-earth see also: Microbial miners take on rare-earth metals https://www.nature.com/articles/d41586-023-03611-4
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