Hydrothermal fluorite solubility experiments and mobility of REE in acidic to alkaline solutions from 100 to 250 °C

Payne, Madison R.; Gysi, Alexander P.; Hurtig, Nicole C.

doi:10.1016/j.chemgeo.2022.121256

Cited by 8 publications

(15 citation statements)

References 72 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Experimental studies on metal fluid/melt transport have also shown that the partition coefficient (Dfluid/melt) of REEs increases with chloride content in fluids [179]. Payne et al (2023) [180] conducted fluorite solubility and REE transport experiments at different pHs, salinities, and temperatures. The experiments showed that adding NaCl can enhance the solubility of REEs in base solutions, with concentrations in the fluid reaching similar levels to the acidic solutions (i.e., NaCl-free and NaCl solutions).…”

Section: Ree Chloride Complexmentioning

confidence: 99%

“…The experiments showed that adding NaCl can enhance the solubility of REEs in base solutions, with concentrations in the fluid reaching similar levels to the acidic solutions (i.e., NaCl-free and NaCl solutions). In the simulation study of complex species, it was also found that variations in pH and ligands lead to distinct dominant species of REE in the solution [34,180]. Louvel et al (2015) employed XAS (X-ray absorption) to investigate the solubility of Yb and observed that under hydrothermal conditions with pH < 2 and NaCleqv > 5 wt.%, the formation of aqueous REE complexes was favored, resulting in a significant increase in Yb solubility (≈n × 1000 ppm) [181].…”

Section: Ree Chloride Complexmentioning

confidence: 99%

“…In acidic-neutral hydrothermal systems, the transport of REEs is primarily controlled by SO 4 2− and Cl − ions, while the presence of F − , CO 3 2− , and PO 4 3− ions play a crucial role in the deposition of REEs [34,109,121,139,180,213]. In alkaline hydrothermal systems, REEs mainly exist in solutions as hydroxyl complexes [181].…”

Section: Geological Implicationsmentioning

confidence: 99%

See 2 more Smart Citations

Complexation of REE in Hydrothermal Fluids and Its Significance on REE Mineralization

Di,

Ding

2024

Minerals

View full text Add to dashboard Cite

Rare earth elements (REEs) have recently been classified as critical and strategic metals due to their importance in modern society. Research on the geochemical behaviors and mineralization of REEs not only provides essential guidance for mineral exploration but also holds great significance in enhancing our understanding of Earth’s origin and evolution. This paper reviews recent research on the occurrence characteristics, deposit types, and hydrothermal behaviors of REEs, with a particular focus on comparing the complexation and transport of REEs by F, Cl, S, C, P, OH, and organic ligands in fluids. Due to the very weak hydrolysis of REE ions, they predominantly exist as either hydrated ions or free ions in low-temperature and acidic to weakly basic fluids. As the ligand activity increases, the general order of transporting REEs is Cl− ≈ > F− ≈ > > OH− under acidic conditions or OH− > ≈ Cl− > F− under alkaline conditions. In acidic to neutral hydrothermal systems, the transport of REEs is primarily dominated by and Cl− ions while the deposition of REEs could be influenced by F−, , and ions. In neutral to alkaline hydrothermal systems, REEs mainly exist in fluids as hydroxyl complexes or other ligand-bearing hydroxyl complexes. Additionally suggested are further comprehensive investigations that will fill significant gaps in our understanding of mechanisms governing the transport and enrichment of REEs in hydrothermal fluids.

show abstract

Section: Ree Chloride Complexmentioning

confidence: 99%

Section: Ree Chloride Complexmentioning

confidence: 99%

Section: Geological Implicationsmentioning

confidence: 99%

See 1 more Smart Citation

Complexation of REE in Hydrothermal Fluids and Its Significance on REE Mineralization

Di,

Ding

2024

Minerals

View full text Add to dashboard Cite

show abstract

“…Current research suggests that subtle differences within the fluoride and chloride affinities of solvated rare earth element or yttrium (REE+Y) cations have a major impact on their hydrothermal transport 1‐8 . However, little is known how these translate to the solid phase and which impact the surface structure has.…”

Section: Introductionmentioning

confidence: 99%

Chemical bonding of HF, HCl, and H2O onto YF3 surfaces: Quantification by first principles

et al. 2023

View full text Add to dashboard Cite

The surfaces of waimirite β-YF 3 have been studied for their fluorine and chlorine versus water affinity. Bonding patterns of HF, HCl, and H 2 O chemically adsorbed onto surfaces of ( 010), ( 100), (011), and (101) have been quantified by density functional theory applying energy decomposition analysis. We found that the adsorption of H 2 O is dominated by about 65% of electrostatics, which causes a low surface sensitivity and weak interactions. On the contrary, the adsorptions of HF and HCl are driven by strong hydrogen bonds resulting in a highly surface-dependent ratio of 30-60% electrostatic versus orbital contribution. Among the stoichiometric surfaces, the shortest and strongest hydrogen bonds and consequently most covalent bonding patterns are found within YF 3 ÁHCl. However, when including the preparation energy, each surface favors the adsorption of HF over HCl, which reproduces the higher affinity of yttrium towards fluoride over chloride, previously known for solutions, also for the solid state.

show abstract

“…Aqueous speciation strongly influences the fractionation, mobilization, and enrichment of the rare earth elements (REE) in natural systems. Important REE species include chloride, fluoride, sulfate, carbonate, and hydroxide complexes [1][2][3]. The stability of these complexes depends on pH and temperature.…”

mentioning

confidence: 99%

A spectrophotometric study of erbium hydrolysis in near-neutral to alkaline aqueous solutions using m-cresol purple from 35 to 75 ℃

Han,

Gysi

2023

Goldschmidt2023 Abstracts

View full text Add to dashboard Cite

Hydrothermal fluorite solubility experiments and mobility of REE in acidic to alkaline solutions from 100 to 250 °C

Cited by 8 publications

References 72 publications

Complexation of REE in Hydrothermal Fluids and Its Significance on REE Mineralization

Complexation of REE in Hydrothermal Fluids and Its Significance on REE Mineralization

Chemical bonding of HF, HCl, and H2O onto YF3 surfaces: Quantification by first principles

A spectrophotometric study of erbium hydrolysis in near-neutral to alkaline aqueous solutions using m-cresol purple from 35 to 75 ℃

Contact Info

Product

Resources

About