An experimental study of the solubility and speciation of tantalum in fluoride-bearing aqueous solutions at elevated temperature

Timofeev, Alexander; Migdisov, Art. A.; Williams-Jones, A. E.

doi:10.1016/j.gca.2016.10.027

Title: An experimental study of the solubility and speciation of tantalum in fluoride-bearing aqueous solutions at elevated temperature

Journal Article · Thu Oct 27 00:00:00 EDT 2016 · Geochimica et Cosmochimica Acta

DOI:https://doi.org/10.1016/j.gca.2016.10.027· OSTI ID:1331289

Timofeev, Alexander ^[1];

^[2]; Williams-Jones, A. E. ^[1]

McGill Univ., Montreal, QC (Canada)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Here, the solubility of Ta₂O₅ (solid) and the speciation of tantalum in HF-bearing aqueous solutions have been determined at temperatures of 100-250 °C and vapour-saturated water pressure. Tantalum is transported as the species Ta(OH)₅⁰ at low HF concentration and pH ~1-3. At higher HF concentration, tantalum mobility is controlled by the species TaF₃(OH)₃- and TaF₅; the presence of TaF₅⁰ is only evident at ≤150 °C. Equilibrium constants range from -17.4 ± 0.45 to -16.4 ± 0.12 for the formation of Ta(OH)₅ from crystalline Ta₂O₅ and from -8.24 ± 0.64 to -8.55 ± 0.68 for the formation of TaF₃(OH)₃- at 100 and 250 °C, respectively. For TaF₅⁰, they were determined to be 0.13 at 100 °C and -0.35 at 150 °C.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: Foreign Funding; USDOE

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1331289

Report Number(s):: LA-UR-16-25513

Journal Information:: Geochimica et Cosmochimica Acta, Journal Name: Geochimica et Cosmochimica Acta; ISSN 0016-7037

Publisher:: The Geochemical Society; The Meteoritical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 65 works

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