fig2
![Alkali pretreatment effects on acid leaching recovery of rare earth elements from coal waste of the Western Kentucky No. 13 and Fire Clay seams](https://image.oaes.cc/020683d7-f854-43cd-b83e-bde768784680/4853.fig.2.jpg)
Figure 2. Leaching recoveries of individual REEs obtained from the alkali pretreatment of the (A) Western Kentucky No. 13 and (B) Fire Clay coal wastes with 5 M NaOH. REEs: Rare earth elements.
Figure 2. Leaching recoveries of individual REEs obtained from the alkali pretreatment of the (A) Western Kentucky No. 13 and (B) Fire Clay coal wastes with 5 M NaOH. REEs: Rare earth elements.
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