E3S Web Conf.
Volume 98, 201916th International Symposium on Water-Rock Interaction (WRI-16) and 13th International Symposium on Applied Isotope Geochemistry (1st IAGC International Conference)
|Number of page(s)||5|
|Section||Thermodynamics and Kinetics of Water-Rock Interaction, Experimental Geochemistry|
|Published online||07 June 2019|
Spontaneous distillation of silica-bearing solution in closed system with rough walls
Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, Moscow, 119991 Russia
2 Earth and Environmental Systems Institute, Pennsylvania State University, PA 16802, United States
3 Shubnikov Institute of Crystallography, Russian Academy of Sciences, Moscow, 119333 Russia
* Corresponding author: email@example.com
The 300°C experiments were conducted in hermetic platinum ampoules with aqueous solution saturated by SiO2 with respect to quartz. The solute SiO2 concentration did not change with time in ampoules with the smooth walls, however in the ampoules with the induced roughness on their walls it decreased exponentially with time and amorphous silica precipitated on the ampoule walls contacted with the water vapor. The experimental results were explained by the distillation initiated through preferential water evaporation in the thin layer (<100 nm) at the meniscus edge and strengthened by the surface wall roughness because of the evaporation surface area increase at the wall wetting in the impregnation regime. This process was accompanied by the progressive disturbance of the equilibrium distribution of the dissolved silica between liquid water and vapor. The similar mechanism might exist in the systems of the different composition. It may initiate the continuous renewal of the water dissolving ability, which can lead at natural conditions to the migration of the voids partially filled by the solution.
© The Authors, published by EDP Sciences, 2019
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