Freeing rare-earth metals from coal ash

Sandia National Laboratories researcher Guangping Xu adds coal ash into a citric acid mixture. This solution will be fed into a reactor — operating at about 70 times atmospheric pressure — where supercritical carbon dioxide aids citric acid in extracting rare-earth metals.

 

Learn more at bit.ly/3GnuIfK

 

Photo by Rebecca Lynne Gustaf

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