| Autor: |
Akinfiev, N., Tagirov, B. |
| Zdroj: |
Geology of Ore Deposits; Oct2006, Vol. 48 Issue 5, p402-413, 12p |
| Abstrakt: |
An internally consistent thermodynamic database has been compiled for the Ag-Se (−II, 0, +IV)-S (−II, +VI)-Cl-O-H system on the basis of published experimental data. This database is fit for predicting the chemical properties of species over a broad interval of temperatures (0–600°C) and pressures (1–3000 bar). The stability constant of the hydroselenide silver complexes [AgHSeaq] and [Ag(HSe)] has been estimated. A thermodynamic model of the effect of Se on the transport properties of Ag-bearing hydrothermal fluid has been developed. Selenium has been found to be a good precipitant even if its concentration in the fluid is five orders lower than the sulfur concentration. When the temperature falls, the role of selenium as a precipitant becomes increasingly important. It has also been shown that the effect of hydroselenide complexes on Ag behavior in natural hydrothermal fluids may be ignored. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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