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Article

Mineral Carbonation of CO2 in Mafic Plutonic Rocks, II—Laboratory Experiments on Early-Phase Supercritical CO2‒Brine‒Rock Interactions

1
Departamento de Geociências, Escola de Ciências e Tecnologia, Universidade de Évora, Rua Romão Ramalho 59, 7000-671 Évora, Portugal
2
Laboratório HERCULES, Universidade de Évora, Largo Marquês de Marialva 8, 7000-809 Évora, Portugal
3
Instituto Geológico y Minero de España, C/Matemático Pedrayes 25, 33005 Oviedo, Spain
4
Instituto de Ciências da Terra, Universidade de Évora, Rua Romão Ramalho 59, 7000-671 Évora, Portugal
5
Departamento de Química, Escola de Ciências e Tecnologia, Universidade de Évora, Rua Romão Ramalho 59, 7000-671 Évora, Portugal
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(15), 5083; https://doi.org/10.3390/app10155083
Received: 16 June 2020 / Revised: 20 July 2020 / Accepted: 21 July 2020 / Published: 23 July 2020
The potential for mineral carbonation of CO2 in plutonic mafic rocks is addressed through a set of laboratory experiments on cumulate gabbro and gabbro-diorite specimens from the Sines Massif (Portugal). The experiments were conducted in an autoclave, for a maximum of 64 days, using a CO2 supersaturated brine under pressure and temperature conditions similar to those expected around an injection well during early-phase CO2 injection. Multiple techniques for mineralogical and geochemical characterization were applied ante- and post-carbonation experiments. New mineralogical phases (smectite, halite and gypsum), roughness increase and material loss were observed after exposure to the CO2 supersaturated brine. The chemical analysis shows consistent changes in the brine and rock specimens: (i) increases in iron (Fe) and magnesium (Mg) in the aqueous phase and decreases in Fe2O3 and MgO in the specimens; (ii) a decrease in aqueous calcium (Ca) and an increase in CaO in the cumulate gabbro, whereas in the gabbro-diorite aqueous Ca increased and afterwards remained constant, whereas CaO decreased. The geochemical model using the CrunchFlow code was able to reproduce the experimental observations and simulate the chemical behavior for longer times. Overall, the study indicates that the early-stage CO2 injection conditions adopted induce mainly a dissolution phase with mineralogical/textural readjustments on the external area of the samples studied. View Full-Text
Keywords: CO2 storage; supercritical CO2; mafic plutonic rocks; experimental test CO2 storage; supercritical CO2; mafic plutonic rocks; experimental test
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MDPI and ACS Style

Moita, P.; Berrezueta, E.; Abdoulghafour, H.; Beltrame, M.; Pedro, J.; Mirão, J.; Miguel, C.; Galacho, C.; Sitzia, F.; Barrulas, P.; Carneiro, J. Mineral Carbonation of CO2 in Mafic Plutonic Rocks, II—Laboratory Experiments on Early-Phase Supercritical CO2‒Brine‒Rock Interactions. Appl. Sci. 2020, 10, 5083. https://doi.org/10.3390/app10155083

AMA Style

Moita P, Berrezueta E, Abdoulghafour H, Beltrame M, Pedro J, Mirão J, Miguel C, Galacho C, Sitzia F, Barrulas P, Carneiro J. Mineral Carbonation of CO2 in Mafic Plutonic Rocks, II—Laboratory Experiments on Early-Phase Supercritical CO2‒Brine‒Rock Interactions. Applied Sciences. 2020; 10(15):5083. https://doi.org/10.3390/app10155083

Chicago/Turabian Style

Moita, Patrícia; Berrezueta, Edgar; Abdoulghafour, Halidi; Beltrame, Massimo; Pedro, Jorge; Mirão, José; Miguel, Catarina; Galacho, Cristina; Sitzia, Fabio; Barrulas, Pedro; Carneiro, Júlio. 2020. "Mineral Carbonation of CO2 in Mafic Plutonic Rocks, II—Laboratory Experiments on Early-Phase Supercritical CO2‒Brine‒Rock Interactions" Appl. Sci. 10, no. 15: 5083. https://doi.org/10.3390/app10155083

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