Janot N., Huot Hermine, Rivard C., Perrin M., Noirault A., Tang Y.T., Watteau F., Montargès-Pelletier E. (2025). Localization and speciation of rare earth elements in mine tailings from ion-adsorption clay deposits, Southern China : insights from microfocused X-ray fluorescence spectroscopy. Journal of Hazardous Materials Advances, 17, 100609 [13 p.]. ISSN 2772-4166.
Titre du document
Localization and speciation of rare earth elements in mine tailings from ion-adsorption clay deposits, Southern China : insights from microfocused X-ray fluorescence spectroscopy
Année de publication
2025
Auteurs
Janot N., Huot Hermine, Rivard C., Perrin M., Noirault A., Tang Y.T., Watteau F., Montargès-Pelletier E.
Source
Journal of Hazardous Materials Advances, 2025,
17, 100609 [13 p.] ISSN 2772-4166
Economic exploitation of Ion-Adsorption Rare Earth Elements (REEs) Deposits, a type of ore specific to southern China, has been traditionally performed by heap leaching, creating large amounts of tailings. To design sustainable reclamation techniques for these sites, an understanding of the speciation of residual REEs in the tailings is needed. The aim of the present study was to identify the REE-bearing phases in reclaimed and non-reclaimed tailings from a demonstration site in Dingnan, Jiangxi province, China, in undisturbed soil thin sections using synchrotron-based microfocused X-ray spectroscopy. Bulk and microscale results showed that REEs were concentrated in the fine fraction (<50 ?m), mainly dispersed within a heterogeneous micrometric matrix. Using micro-spectroscopy, micro-hotspots of Ce(IV) were evidenced, assigned to CeO2 microparticles, unaffected by the leaching treatment and dispersed in the tailings. Analyses performed on reclaimed tailing samples (amended with organic substances and planted) showed the high affinity of REEs for organic phases, even at very low concentration, suggesting a significant positive impact of phytoremediation onto REE fate in this post-mining context.
Plan de classement
Constituants et propriétés des sols [068PROSOL]
;
Secteur minier et énergie [096ENERG]
Localisation
Fonds IRD [F B010094570]
Identifiant IRD
fdi:010094570
