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EXPERIMENTAL DETERMINATION OF FERBERITE SOLUBILITY IN THE KCl-HCl-H2O SYSTEM AT 400-500 °C, AND 20-100 MPaстатья
- Авторы: Redkin Alexander F., Cygan Gary L.
- Сборник: Advances in Experimental and Genetic Mineralogy
- Серия: Special Publication to 50th Anniversary of DS Korzhinskii Institute of Experimental Mineralogy of the Russian Academy of Sciences. Litvin Yu.A. Safonov O.G (Editors)
- Том: 11
- Глава в коллективной монографии
- Год издания: 2020
- Издательство: Springer International Publishing
- Местоположение издательства: New York
- Первая страница: 137
- Последняя страница: 162
- Номер статьи: 7
- DOI: 10.1007/978-3-030-42859-4_7
- Аннотация: The solubility of ferberite, FeWO4 was studied at 400-500 °C, pressures of 20, 25, 40, 50 and 100 MPa, oxygen fugacity corresponding to the Ni-NiO, Fe3O4-Fe2O3 buffers, in 0.7 ÷ 8.9 mKCl solutions and acidity controlled by quartz-microcline-muscovite buffer assemblage. The parameters of the experiments cover both the field of homogeneous solutions and the region of immiscibility in the KCl-H2O system. The total W concentration depends upon mCl, T and fO2 in the system and range from 1·10-4-0.05 mol·kg-1 in 0.7 mKCl to 0.01-0.15 in 8.9 mKCl. The results suggest a large bulk solubility in the dense, salt-rich phase of the two-phase fluid. Ferberite dissolution in KCl solutions under pH and fO2 buffered conditions at 400-500 °C proceeds congruently as well as incongruently with accompanying potassium tungsten tungsten bronzes formation, KxWO3, (x=0.2-0.3).Thermodynamic calculations performed for a homogeneous solution at P=100 MPa indicate that the predominant aqueous species of tungsten in KCl-HCl solutions at fO2=fO2(Ni-NiO) may be W(V, VI) species: WO3-, HWO4-, H2W2O7- at 500 °C and HWO4-, W5O163- at 400 °C.Application of the extended FeWO4 solubility model to natural systems suggest that deposition of tungsten from ore-bearing solutions is due to interaction with wall rocks containing feldspars, and iron oxides together with decreasing temperatures. In the magnetite bearing system, the equilibrium tungsten concentration does not exceed 2·10-5 mol·kg–1 at temperatures of 400 °C.
- Добавил в систему: Редькин Александр Федорович
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | Полный текст | Redkin-Cygan_2020AEGM.pdf | 2,1 МБ | 11 сентября 2020 [aredkin] |