fig11
![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.11.jpg)
Figure 11. Leaching recoveries of Al obtained from the alkali pretreatment of the (A) Western Kentucky No. 13 and (B) Fire Clay coal wastes with NaOH solutions of different concentrations.
Figure 11. Leaching recoveries of Al obtained from the alkali pretreatment of the (A) Western Kentucky No. 13 and (B) Fire Clay coal wastes with NaOH solutions of different concentrations.
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