Research Publication on Extraction of ScandiumSeems that a Finnish research group is developing an extraction process for Kiviniemi scandium property, owned by Scandium International. The proces contains (i) magnetic separation followed by (ii) pyrometallurgical process producing metallic iron and slag enriched in scandium. Scandium will be finally (iii) extracted from the slag using hydrometallurgical process. Their third paper was just published in Metals. If successful that extraction process might fit also to Crater Lake ore processing.
Kallio R, Tanskanen P, Heikkinen E-P, Kokkonen T, Luukkanen S, Fabritius T. Slag Modification in Reduction of Kiviniemi Ferrous Scandium Concentrates. Metals. 2022; 12(5):709. https://doi.org/10.3390/met12050709
https://www.mdpi.com/2075-4701/12/5/709