Experimental studies on the barite saturation of a thermal brine | Experimentelle Untersuchungen zur Barytübersättigung einer Thermalsole
1997
Kuhn, Michael | Frosch, Georg | Kölling, Martin | Kellner, Torsten | Althaus, Egon | Schulz, Horst D.
On the basis of thermodynamical modelling it was proves that pressure and temperature variations may induce precipitation of barite, anhydrite/gypsum and celestite in geothermyl power plants. The precipitation dynamics of earth-alkaline sulfates has been investigated in a column experiment simulating in-situ conditions for pressure, temperature, and salinity (216 g/l). In this paper we describe the experimental setup for simulating pressures up to 250 bar and high temperatures in a sandstone core. Additional precipitation experiments confirmed the expected second-orer reaction for the precipitation of barite at a medium rate of 2.5 · 10 ⁻⁴ l · mg ⁻¹ · h ⁻¹ . The experiments show that the solubility of barite (2.5 mg/l Ba and 450 mg/ISO ₄) is higher than the model forecast. Precipitation of celestite and anhydrite/gypsum was not observed. During the column experiments with a sandstone core under in-situ conditions no precipitation of barite, anhydrite/gypsum and celestite took place.
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