Characterization of Lithium-containing Fly Ash Derived from Coal-fired Power Plants in Guizhou Province, China

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Background: Coal-fired power plants, such as those located in Guizhou, are generating substantial amounts of fly ash. This fly ash is rich in lithium, a highly valuable metal utilized in numerous industrial applications. Effective extraction of these metals necessitates a thorough understanding of their characteristics within the fly ash. Methods: Multiple analytical techniques were used to study fly ash';s physicochemical properties. Meanwhile, wet magnetic separation and acid-base methods are employed to separate its mineral phases. Results: The fly ash mainly contains mullite, glass, and iron microspheres, showing spherical particle morphology. It';s rich in O, Si, Al, Fe, C, and oxides like SiO2, Al2O3, Fe2O3. Most particles are smaller than 20 µm. Lithium in the ash existed as Li-O-M compounds, mainly in the non-magnetic and glass phases. Conclusion: Overall, these findings have deepened our understanding of fly ash and the distribution of lithium within it, providing a foundation for the recovery of lithium and other valuable elements.

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