Effect of selenium on silver transport and precipitation by hydrothermal solutions: Thermodynamic description of the Ag-Se-S-Cl-O-H system

Autor:	B. R. Tagirov, N. N. Akinfiev
Rok vydání:	2006
Předmět:	Precipitation (chemistry) Inorganic chemistry chemistry.chemical_element Thermodynamics Geology Silver transport Sulfur Hydrothermal circulation Thermodynamic model chemistry Geochemistry and Petrology Stability constants of complexes Economic Geology Selenium Bar (unit)
Zdroj:	Geology of Ore Deposits. 48:402-413
ISSN:	1555-6476 1075-7015
DOI:	10.1134/s1075701506050059
Popis:	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) 2 − ] 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.
Databáze:	OpenAIRE
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