|
ИСТИНА |
Войти в систему Регистрация |
ИСТИНА ИНХС РАН |
||
Liquid Immiscibility in the System NaF–H2O at 1073 K and 170–230 МPа and Its Effect on the Microlite Solubilityтезисы доклада Тезисы
- Авторы: Redkin A.F., Kotova N.P., Shapovalov Yu B.
- Сборник: Goldschmidt 2015 Conference Abstracts
- Тезисы
- Год издания: 2015
- Место издания: Prague, Czech Republic
- Первая страница: 2600
- Последняя страница: 2600
- Аннотация: Solutions of P-Q type in the field of fluid immiscibility at high Т-Р parameters are of interest as solvents of ore components because they form a couple of phases L1 и L2, which essentially differ in salt content and the dissolving ability in respect of ore components. This phenomenon can play an important role in the mobilization processes of poorly soluble ore components from magmatic melts. Of particular interest is aqueous solution of sodium fluoride of P-Q type which has the critical point at Т>700 °C and Р≈200 МPа. Experimental studies of microlite (CaNa)Ta2O6F solubility were carried out in the system NaF–H2O of P-Q type in a wide range of sodium fluoride concentrations (from 0 to 40 wt.% NaF). Tantalum concentration in equilibrium with microlite and fluorite in the concentrations range of NaF from 0 to 8 mol·kg-1 H2O (25 wt. % NaF) does not exceed 3×10-5 mol·kg-1. Sodium fluoride concentrations have been estimated in immiscible fluids L1 (fluid of moderate density) and L2 (dense fluid) in the system NaF–H2O at 1073 K and 200–230 MPа. The L1 and L2 fluids contain 2 ± 1 and 11 ± 2 wt.% NaF at p = 170 МPа, 5 ± 1 and 26 ± 1 wt.% NaF at p = 200 МPа, and 12 ± 1 and 25 ± 1 wt.% NaF at p = 230 МPа. The thermodynamic calculations indicate that predominant Ta species in the homogenous field of NaF–H2O solutions in equilibrium with microlite and fluorite are HTaO3o, TaO2Fo, and Na6H2Ta6O19o. The work is supported by Russian Foundation for Basic Research Grants 14-05-00145-a, 15-05-03393-а, and the program DES RAS № 2.
- Добавил в систему: Редькин Александр Федорович
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | Полный текст | Redkin_Gold-2015_p2600.pdf | 305,4 КБ | 4 июня 2018 [nkotova] | |
| 2. | Иллюстрация | Redkin_poster_A4.pdf | 308,8 КБ | 21 февраля 2018 [aredkin] |