Paper No. 1-4
Presentation Time: 8:55 AM
DEVELOPING AN INTERNALLY CONSISTENT THERMODYNAMIC PROPERTY DATABASE FOR REE AQUEOUS AND SOLID SPECIES
PAN, Ruiguang1, ZHU, Chen1, GYSI, Alexander2, GONG, Lei1, MIRON, George3, WATERS, Laura4, HURTIG, Nicole4 and MIGDISSOV, Artaches5, (1)Department of Earth and Atmospheric Sciences, Indiana University Bloomington, 1001 E. Tenth St., Bloomington, IN 47405-1405, (2)New Mexico Bureau of Geology & Mineral Resources, New Mexico Institute of Mining and Technology, 801 Leroy Place, Socorro, NM 87801; Department of Earth & Environmental Sciences, New Mexico Institute of Mining and Technology, 801 Leroy Place, Socorro, NM 87801, (3)Laboratory for Waste Management, Paul Scherrer Institute, Forschungsstrasse 111, Villigen PSI, Villigen 5232, Switzerland, (4)Department of Earth & Environmental Sciences, New Mexico Institute of Mining and Technology, 801 Leroy Place, Socorro, NM 87801, (5)Los Alamos National Laboratory, Los Alamos, NM 87545
Rare Earth Elements (REE) are critical (minerals) metals for the transition from fossil fuels to renewable and clean energy. The International Energy Agency predicts that we need seven times more REE in 2040 than that at the 2020 level. Understanding the solubility, speciation, and transport properties of REE in various ore formation, extraction, chemical processing, and recycling processes are crucial for discovering more REE deposits and recovering REE from mining and industrial wastes. Such understanding will be greatly aided by geochemical modeling of geological, environmental, and chemical engineering processes. However, the accuracy of the geochemical modeling results relies on the quality of thermodynamic databases [1]. To complement a program of experimental studies by the team [2-3], this study embarks on developing an internally consistent thermodynamic database for REE aqueous and solid species ranging from surficial Earth to deep crustal conditions (e.g., from 25 °C and 1 bar to 1000 °C and 5 kbar). This presentation will discuss the inventory of currently available datasets, the research needs, and an example of an extensible experimental database (ThermoExp_REE) generated to optimize thermodynamic data in the REE-P-O-H system. This work is part of our new efforts to extend the MINES and SUPCRTBL thermodynamic databases [4-5] to supercritical conditions and make the REE dataset widely available to the community for geochemical modeling softwares (SUPCRTBL, PHREEQC, GEMS, etc.) and applications.
Reference:
[1] Zhu, C. and Nordstrom, D. K. (2022). Flying Blind: Geochemical Modeling and Thermodynamic Data Files. Groundwater, 60(6), 699–700.
[2] Gysi, A.P., et al. (2023). What controls the mobility of rare earth elements (REE) in critical mineral deposits in acidic vs. alkaline hydrothermal fluids?. In Goldschmidt 2023 Conference.
[3] Banerjee, D., et al. (2023). High temperature monazite-(Nd) solubility experiments to predict Nd complexation at variable pH and salinity in supercritical fluids. In Goldschmidt 2023 Conference.
[4] Gysi, A.P., et al. 2023, MINES thermodynamic database, version 19.1. https://doi.org/10.58799/mines-tdb.
[5] Zimmer, K., et al. (2016). SUPCRTBL: A revised and extended thermodynamic dataset and software package of SUPCRT92. Comput. Geosci. 90, 97–111.
![[Visit Client Website]](/img/gsa/banner.jpg)