Pyrochlore Solubility in NaF Solutions at 800°C and p = 170–230 MPa

Авторы: Redkin A.F., Kotova N.P., Shapovalov Yu B.
Журнал: Doklady Earth Sciences
Том: 507
Номер: 1
Год издания: 2022
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 887
Последняя страница: 900
DOI: 10.1134/S1028334X22700349
Аннотация: The solubility of pyrochlore (NaCa)Nb2O6F was studied experimentally in the NaF–H2O systemcovering both the homogeneous region of hydrothermal solutions and the region of fluid immiscibility in theNaF concentration range from 0.1 to 16 mol kg–1 H2O at 800°С and a pressure of 170–230 MPa. It wasshown that the content of Nb in solutions saturated with pyrochlore and fluorite is in the range from 10–5 to10–3 mol kg–1 H2O. A decrease in mNb is detected with an increasing NaF concentration in the region offluid immiscibility. It is shown that the most likely forms of niobium in the studied fluoride solutions may beparticles of HNbO and NbO2F0. A comparative analysis of the experimental data indicates that the concentrationof Nb in equilibrium with pyrochlore and fluorite in 10–2–10 m NaF solutions is 10–50 times higherthan the concentration of Ta in equilibrium with microlite and fluorite.
Добавил в систему: Котова Наталья Петровна

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