The influence of gas and humidity on the mineralogy of various salt compositions – implications for natural and technical caverns
<p>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 t...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2018-08-01
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| Series: | Advances in Geosciences |
| Online Access: | https://www.adv-geosci.net/45/227/2018/adgeo-45-227-2018.pdf |
| Summary: | <p>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 CO<sub>2</sub>,
N<sub>2</sub> or CH<sub>4</sub> 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 CO<sub>2</sub>, acidification of the aqueous phase occurs which enhances
the dissolution rate and reaction kinetics.</p> |
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| ISSN: | 1680-7340 1680-7359 |