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Influence of Silicate Substance on Pyrochlore and Tantalite Solubility in Fluoride Aqueous Solutions (Experimental Studies)

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Part of the Springer Mineralogy book series (MINERAL)

Abstract

Experimental results of behavior of natural minerals of pyrochlore and tantalite in solutions KF, NaF and LiF in the presence of quartz (granite) at T = 550°–850 °C, P = 1 kbar are presented. The considerable influence of silicate substance presence on mineral solubility in water solutions of alkali metal fluorides in hydrothermal conditions is shown. The study of fluid inclusions in quartz showed that under experimental conditions (heterogeneous state of the fluid) the reactions of high-temperature hydrolysis KF: KF + H2O = KOH + HF, with the separation of acid and alkaline components between the immiscible phases of the fluid are intensive. In this case, the interaction of alkaline components with quartz occurs: SiO2 + 2KOH = K2SiO3 + H2O, with the formation of a phase of silicate glass (aqueous solution-melt). This phase of silicate alkaline melt enriched with fluorine concentrates tantalum and niobium (up to 8% of Ta2O5 and 16% of Nb2O5) and can serve as a phase—a concentrator of ore elements in the formation of tantalum-niobate deposits at the last low-temperature stages of crystallization of rare-metal granites.

Keywords

Niobium-tantalum deposits Experimental modeling Hydrothermal fluoride fluid Pyrochlore solubility Tantalite solubility Alcaline-silicate melt-concentrator 

Notes

Acknowledgements

This work was supported by the grant of the Russian Foundation for Basic Research № 15-05-03393-a.

Theme # AAAAA-A18-118020590151-3.

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Copyright information

© The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Switzerland AG 2020

Authors and Affiliations

  1. 1.D.S. Korzhinskii Institute of Experimental Mineralogy, Russian Academy of Science AcademicianChernogolovka, Moscow RegionRussia
  2. 2.Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of SciencesMoscowRussia

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