Economic and Environmental Geology

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Fig. 10 REE extraction processing from coal and coal byproducts. Pre-acid leaching calcination improved recovery of rare earth elements by increasing interior surface area of the coal particles. University of Kentucky is producing REO of 98% purity with this processing methods (modified after U.S. DOE and NETL roadmap).
Econ. Environ. Geol. 2022;55:241~259
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