Experimental Study of the Solubility of Natural Tantalite and Pyrochlore and Tantalum and Niobium Oxides in Hydrothermal Fluoride–Chloride Solutions

The concentration and temperature dependences of the solubility of tantalite, pyrochlore, and tantalum and niobium oxides in fluoride–chloride aqueous ( m HF + m HCl) solutions at 300–550°C and 100 MPa (Co–CoO buffer) were studied experimentally. The initial concentration of HF varied from 0.01 m to...

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Veröffentlicht in:	Doklady earth sciences 2022-07, Vol.505 (1), p.431-438
Hauptverfasser:	Kotova, N. P., Korzhinskaya, V. S., Shapovalov, Yu. B.
Format:	Artikel
Sprache:	eng
Schlagworte:	Chlorides Comparative analysis Earth and Environmental Science Earth Sciences Fluorides Geochemistry Niobium Niobium oxides Oxides Pyrochlores Solubility Solutions Tantalum
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Beschreibung
Zusammenfassung:	The concentration and temperature dependences of the solubility of tantalite, pyrochlore, and tantalum and niobium oxides in fluoride–chloride aqueous ( m HF + m HCl) solutions at 300–550°C and 100 MPa (Co–CoO buffer) were studied experimentally. The initial concentration of HF varied from 0.01 m to 2 m , while the HCl concentration remained constant and was 0.5 m . A comparative analysis of the equilibrium contents of Nb and Ta upon dissolution of tantalum and niobium oxides and natural tantalite and pyrochlore in fluoride, chloride, and mixed ( m HF + m HCl) solutions was carried out.
ISSN:	1028-334X 1531-8354
DOI:	10.1134/S1028334X22070108