Other
Scientific paper
Dec 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52.3005k&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 52, Issue 12, pp.3005-3015
Other
7
Scientific paper
Solubility of stibnite (Sb 2 S 3 ) was measured in aqueous hydrogen sulfide solutions as a function of pH and total free sulfur (TFS) concentrations at 25, 90, 200, 275, and 350°C and at saturated vapor pressures. At 25 and 90°C and TFS 0.01 molal solubility is controlled by the thioantimonite complexes H 2 Sb 2 S o 4 , HSb 2 S - 4 , Sb 2 S 2- 4 (and polymers of the general composition H 2-x Sb 2n S x- 3n+1 ). At higher temperatures the hydroxothioantimonite complex Sb 2 S 2 (OH) 0 2 (or polymers of composition Sb 2n S 3n-1 (OH) 0 2 ) becomes dominant. Polymerization due to condensation reactions yields long chains made up of trigonal-pyramidal SbS 3 -groups (and SbS 2 OH-groups). Equilibrium constants were derived for the dimers. The transition from thioantimonites to the hydroxothioantimonite species at approximately 120°C is endothermic and is entirely driven by a gain in entropy. Stibnite solubility calculated for some geothermal fluids indicate that these fluids are undersaturated in Sb if stibnite is the solid equilibrium phase. At high temperatures (>100°C) precipitation of stibnite from ore fluids can occur in response to conductive cooling, while at low temperatures, where thioantimonites dominate, acidification of the fluid ( e.g. due to oxidation of H 2 S) is the more likely mechanism. Precipitation of stibnite from fluids containing hydroxothioantimonite consumes H 2 S and may thus trigger precipitation of other metals carried as sulfide complexes, e.g. Au(HS) - 2 .
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