|About this Abstract
||Part C-3: Processing of Critical Metals
||Hydrometallurgical Extraction of Rare Earth Elements from Coal Sources
||Rick Honaker, Xinbo Yang, Alind Chandra, Wencai Zhang
|On-Site Speaker (Planned)
Rare earth elements (REEs) contained in coal and associated mineral matter exist in several forms including micro-dispersed minerals, ion adsorption onto clay surfaces, and chemically bound. Tests found that REEs can be effectively recovered from certain components of three coal sources by leaching under mild conditions followed by solvent extraction. A range of pH values were evaluated at solution temperatures of 25 degrees C and 75 degrees C. When using 1 mol/L of sulfuric acid, nearly 85% recovery of the REEs was extracted from the middlings material collected from an operating plant. Acid leaching of a second middling source from another plant resulted in 60% of the total REEs being recovered under the same leaching conditions. Solvent extraction treatment of the leachate produced from six different coal sources resulted in products containing up to 50% total REEs from feedstocks starting with around 300 ppm.
||Planned: At-meeting proceedings