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Tag Archives: mining

‘I’m melting, melting’ — environmentally hazardous coal waste diminished by citric acid

ALBUQUERQUE, N.M. — In one of nature’s unexpected bounties, a harmless food-grade solvent has been used to extract highly sought rare-earth metals from coal ash, reducing the amount of ash without damaging the environment and at the same time increasing an important national resource. Coal ash is the unwanted but widely present residue of coal-fired […]