fig1

Alkali pretreatment effects on acid leaching recovery of rare earth elements from coal waste of the Western Kentucky No. 13 and Fire Clay seams

Figure 1. Leaching recoveries of TREEs, HREEs, and LREEs obtained from the alkali pretreatment of the (A-C) Western Kentucky No. 13 and (D-F) Fire Clay coal wastes with NaOH solutions of different concentrations. TREEs: Total rare earth elements; HREEs: heavy rare earth elements; LREEs: light rare earth elements.

Minerals and Mineral Materials
ISSN 2832-269X (Online)

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