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Understanding the unique geochemical behavior of Sc in the interaction with clay minerals

  • Yingchun Zhang ORCID logo , Xiandong Liu ORCID logo , Xiancai Lu and Rucheng Wang
Published/Copyright: December 31, 2023
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Abstract

Regolith-hosted rare earth elements (REEs) deposits received great attention due to the increasing incorporation of REEs in modern technologies. In lateritic Sc deposits and ion-adsorption deposits (IADs), Sc behaves quite differently from REEs: REEs adsorb as outer-sphere complexes on clay surface in IADs, while Sc could enter the lattice of clay minerals in lateritic Sc deposits. The unique behavior of Sc has not been well understood yet. Here, by using first-principles molecular dynamics techniques, we show that the complexation mechanisms of Y3+ and Sc3+ on clay edge surfaces are distinctly diferent. Y3+ preferentially adsorbs on Al(OH)2SiO site with its coordination water protonated. Sc3+ is found to behave similarly to other first-row transition metals (e.g., Ni2+) due to its smaller ionic radius and prefers adsorbing on the vacancy site, from where Sc3+ can be readily incorporated in the clay lattice. The H2O ligands of Sc3+ get deprotonated upon complexation, providing new binding sites for further enrichment of Sc3+. These processes prevent Sc3+ from being leached during weathering and lead to the formation of Sc-rich clay minerals found in lateritic deposits. Based on these results, it is revealed that the small ionic radius and high affinity to enter the vacancy on edge surfaces make Sc compatible with clay minerals and are the origin of its unique geochemical behavior.

Acknowledgments and Funding

This study was supported by the National Natural Science Foundation of China (No. 42125202) and China Postdoctoral Science Foundation (No. 2022M721547). We acknowledge the financial support from the State Key Laboratory for Mineral Deposits Research at Nanjing University. We are grateful to the High Performance Computing Center (HPCC) of Nanjing University for doing the numerical calculations in this paper on its blade cluster system.

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Received: 2023-01-17
Accepted: 2023-03-01
Published Online: 2023-12-31
Published in Print: 2024-01-29

© 2023 by Mineralogical Society of America

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