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Advances in Geosciences An open-access journal for refereed proceedings and special publications
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Volume 45 | Copyright
Adv. Geosci., 45, 227-233, 2018
https://doi.org/10.5194/adgeo-45-227-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

  29 Aug 2018

29 Aug 2018

The influence of gas and humidity on the mineralogy of various salt compositions – implications for natural and technical caverns

Bettina Strauch1, Martin Zimmer1, Axel Zirkler2, Stefan Höntzsch3, and Anja M. Schleicher1 Bettina Strauch et al.
  • 1GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, Germany
  • 2K+S Aktiengesellschaft, Bertha-von-Suttner-Straße 7, 34131 Kassel, Germany
  • 3K+S Windsor Salt Ltd., 30 Prospect Avenue, Windsor, ON, Canada

Abstract. Storage caverns are increasingly located in heterogeneous salt deposits and filled with various fluids. The knowledge of phase behaviour in heterogeneous systems of salt, liquid and gas and the requirements for reliable analytical techniques is, therefore, of growing interest. A method that allows for the continuous monitoring of mineral compositions at distinct humidity and gas content using XRD measurements is presented here. Various saliniferous mineral compositions have been investigated in pure CO2, N2 or CH4 atmospheres with varying humidity in a closed chamber. All mineral compositions experience dissolution and/or mineral conversion reaction accompanied by volume loss. Dissolution-recrystallization reactions of complex mineral assemblages involving halite, sylvite, kieserite, carnallite and kainite were observed using this method. For carnallite-rich mineral assemblages, the mineral conversion from carnallite to sylvite was observed when humidity exceeded 50%RH. In the presence of CO2, acidification of the aqueous phase occurs which enhances the dissolution rate and reaction kinetics.

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The impact of humidity and gas (CO2, N2, CH4) on saliniferous mineral compositions was studied and show dissolution-recrystallization reactions involving halite, sylvite, kieserite, carnallite and kainite. CO2 causes acidification of the aqueous phase which enhances dissolution rate and reaction kinetics. These simulations allow for the evaluation of the interachtion between and host rock and fillings along the walls of storage caverns in salt deposits.
The impact of humidity and gas (CO2, N2, CH4) on saliniferous mineral compositions was studied...
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