Extraction Kinetics of Rare Earth Elements from Ion-Adsorbed Underclays

Prem, Priscilla; Burgess, Ward; Yang, Jon; Verba, Circe

doi:10.3390/min13121503

Extraction Kinetics of Rare Earth Elements from Ion-Adsorbed Underclays

Journal Article · Thu Nov 30 00:00:00 EST 2023 · Minerals

DOI:https://doi.org/10.3390/min13121503· OSTI ID:2222946

Prem, Priscilla; Burgess, Ward; Yang, Jon; Verba, Circe

Citric acid has been identified as an environmentally sustainable organic acid capable of leaching up to ~30% of easily accessible REEs from underclay material. An analysis of the leaching profiles was performed to discern the reaction rates, extraction efficiencies, and potential leaching mechanisms of REEs and cations of interest from ion-adsorbed underclays. The initial leaching stage follows a slow intraparticle diffusion mechanism followed by a second stage controlled by a mixed diffusion regime. The leaching profiles of Ca and P were similar to those of REEs, suggesting that REEs are most likely derived from mineral surfaces such as hydroxyapatite or crandallite rather than predominately from underclays. Fitting to a modified diffusion control model found diffusion-controlled leaching to be the primary mechanism whereas non-diffusive mechanisms made up about 22% of the extracted REEs. Gangue cations associated with underclays had less non-diffusive leaching than REE species, indicating that their leaching kinetics may be dominated by diffusion from within the material or potentially from product layer formation. Fitting to Boyd plots further indicated that REEs were leached following intraparticle diffusion control. These results have important implications for the development of more efficient and sustainable methods for extracting REEs or critical minerals from alternative feedstocks.

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Sponsoring Organization:: USDOE

OSTI ID:: 2222946

Journal Information:: Minerals, Journal Name: Minerals Journal Issue: 12 Vol. 13; ISSN MBSIBI; ISSN 2075-163X

Publisher:: MDPI AGCopyright Statement

Country of Publication:: Switzerland

Language:: English

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