Goethite, a tailor-made host for the critical metal scandium: The FexSc(1-x)OOH solid solution
2018
Levard, C. | Borschneck, D. | Grauby, O. | Rose, Jérôme | Ambrosi, J. P. | Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement (CEREGE) ; Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) | Centre Interdisciplinaire de Nanoscience de Marseille (CINaM) ; Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS)
International audience
Show more [+] Less [-]English. Scandium is the subject of increasing interest and is even becoming critical for a number of institutions in Europe and the U.S.A. among others because of its economic value and supply risk. Despite this growing awareness, little is known about its geochemical behaviour. Recent studies have shown that Sc can be strongly associated with iron oxides including goethite but the mode of interaction is not yet fully understood. We investigated the incorporation of Sc in goethite structure in controlled batch systems. For the first time, we show the formation of a solid alpha FeOOH-aScOOH solution consistent with an ideal solution despite significant differences in atomic radii between Sc3+ and Fe3+. We believe that beyond this fundamental knowledge concerning the affinity of Sc for goethite, these results provide important insights into Sc speciation in primary or secondary sources, including Sc-rich lateritic deposits and bauxite residues after alumina extraction, for the future design of extraction processes with a low environmental footprint, as an alternative to current energy-intensive technologies.
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