The solubility of gold in H2O-H2S vapour at elevated temperature and pressure |
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| Authors: | Denis Yu Zezin Artashes A Migdisov Anthony E Williams-Jones |
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| Institution: | Department of Earth and Planetary Sciences, McGill University, 3450 University St., Montreal, QC, Canada H3A 2A7 |
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| Abstract: | This experimental study sheds light on the complexation of gold in reduced sulphur-bearing vapour, specifically, in H2O-H2S gas mixtures. The solubility of gold was determined in experiments at temperatures of 300, 350 and 365 °C and reached 2.2, 6.6 and 6.3 μg/kg, respectively. The density of the vapour varied from 0.02 to 0.22 g/cm3, the mole fraction of H2S varied from 0.03 to 0.96, and the pressure in the cell reached 263 bar. Statistically significant correlations of the amount of gold dissolved in the fluid with the fugacity of H2O and H2S permit the experimental data to be fitted to a solvation/hydration model. According to this model, the solubility of gold in H2O-H2S gas mixtures is controlled by the formation of sulphide or bisulphide species solvated by H2S or H2O molecules. Formation of gold sulphide species is favoured statistically over gold bisulphide species and thus the gold is interpreted to dissolve according to reactions of the form: |
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