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From:  Alkali pretreatment effects on acid leaching recovery of rare earth elements from coal waste of the Western Kentucky No. 13 and Fire Clay seams
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 10. XRD patterns of the raw, alkali-pretreated, and alkali-pretreated, acid-leached coal wastes of the (A) Western Kentucky No. 13 and (B) Fire Clay seams. (Alkali pretreatment conditions: 5 M NaOH at 90 °C; acid leaching conditions: 1.2 M HCl at 90 °C). XRD: X-ray diffraction.

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