CO 2 utilization in built environment via the P CO 2 swing carbonation of alkaline solid wastes with different mineralogy
Carbon mineralization to solid carbonates is one of the reaction pathways that can not only utilize captured CO 2 but also potentially store it in the long term. In this study, the dissolution and carbonation behaviors of alkaline solid wastes (i.e., waste concrete) was investigated. Concrete is one...
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ftosti:oai:osti.gov:1860624 2023-07-30T04:02:56+02:00 CO 2 utilization in built environment via the P CO 2 swing carbonation of alkaline solid wastes with different mineralogy Rim, Guanhe Roy, Noyonika Zhao, Diandian Kawashima, Shiho Stallworth, Phillip Greenbaum, Steven G. Park, Ah-Hyung Alissa 2022-06-13 application/pdf http://www.osti.gov/servlets/purl/1860624 https://www.osti.gov/biblio/1860624 https://doi.org/10.1039/d1fd00022e unknown http://www.osti.gov/servlets/purl/1860624 https://www.osti.gov/biblio/1860624 https://doi.org/10.1039/d1fd00022e doi:10.1039/d1fd00022e 37 INORGANIC ORGANIC PHYSICAL AND ANALYTICAL CHEMISTRY 2022 ftosti https://doi.org/10.1039/d1fd00022e 2023-07-11T10:11:30Z Carbon mineralization to solid carbonates is one of the reaction pathways that can not only utilize captured CO 2 but also potentially store it in the long term. In this study, the dissolution and carbonation behaviors of alkaline solid wastes (i.e., waste concrete) was investigated. Concrete is one of the main contributors to a large carbon emission in the built environment. Thus, the upcycling of waste concrete via CO 2 utilization has multifaceted environmental benefits including CO 2 emission reduction, waste management and reduced mining. Unlike natural silicate minerals such as olivine and serpentine, alkaline solid wastes including waste concrete are highly reactive, and thus, their dissolution and carbonation behaviors vary significantly. Here, both conventional acid (e.g., hydrochloric acid) and less studied carbonic acid (i.e., CO 2 saturated water) solvent systems were explored to extract Ca from concrete. Non-stoichiometric dissolution behaviors between Ca and Si were confirmed under far-from-equilibrium conditions (0.1 wt% slurry density), and the re-precipitation of the extracted Si was observed at near-equilibrium conditions (5 wt% slurry density), when the Ca extraction was performed at a controlled pH of 3. These experiments, with a wide range of slurry densities, provided valuable insight into Si re-precipitation phenomena and its effect on the mass transfer limitation during concrete dissolution. Next, the use of the partial pressure of CO 2 for the pH swing carbon mineralization process was investigated for concrete, and the results were compared to those of Mg-bearing silicate minerals. In the P CO 2 swing process, the extraction of Ca was significantly limited by the precipitation of the carbonate phase (i.e., calcite), since CO 2 bubbling could not provide a low enough pH condition for concrete–water–CO 2 systems. Furthermore, this study showed that the two-step carbon mineralization via P CO 2 swing, that has been developed for Mg-bearing silicate minerals, may not be viable for highly ... Other/Unknown Material Carbonic acid SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Faraday Discussions 230 187 212 |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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ftosti |
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37 INORGANIC ORGANIC PHYSICAL AND ANALYTICAL CHEMISTRY |
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37 INORGANIC ORGANIC PHYSICAL AND ANALYTICAL CHEMISTRY Rim, Guanhe Roy, Noyonika Zhao, Diandian Kawashima, Shiho Stallworth, Phillip Greenbaum, Steven G. Park, Ah-Hyung Alissa CO 2 utilization in built environment via the P CO 2 swing carbonation of alkaline solid wastes with different mineralogy |
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37 INORGANIC ORGANIC PHYSICAL AND ANALYTICAL CHEMISTRY |
description |
Carbon mineralization to solid carbonates is one of the reaction pathways that can not only utilize captured CO 2 but also potentially store it in the long term. In this study, the dissolution and carbonation behaviors of alkaline solid wastes (i.e., waste concrete) was investigated. Concrete is one of the main contributors to a large carbon emission in the built environment. Thus, the upcycling of waste concrete via CO 2 utilization has multifaceted environmental benefits including CO 2 emission reduction, waste management and reduced mining. Unlike natural silicate minerals such as olivine and serpentine, alkaline solid wastes including waste concrete are highly reactive, and thus, their dissolution and carbonation behaviors vary significantly. Here, both conventional acid (e.g., hydrochloric acid) and less studied carbonic acid (i.e., CO 2 saturated water) solvent systems were explored to extract Ca from concrete. Non-stoichiometric dissolution behaviors between Ca and Si were confirmed under far-from-equilibrium conditions (0.1 wt% slurry density), and the re-precipitation of the extracted Si was observed at near-equilibrium conditions (5 wt% slurry density), when the Ca extraction was performed at a controlled pH of 3. These experiments, with a wide range of slurry densities, provided valuable insight into Si re-precipitation phenomena and its effect on the mass transfer limitation during concrete dissolution. Next, the use of the partial pressure of CO 2 for the pH swing carbon mineralization process was investigated for concrete, and the results were compared to those of Mg-bearing silicate minerals. In the P CO 2 swing process, the extraction of Ca was significantly limited by the precipitation of the carbonate phase (i.e., calcite), since CO 2 bubbling could not provide a low enough pH condition for concrete–water–CO 2 systems. Furthermore, this study showed that the two-step carbon mineralization via P CO 2 swing, that has been developed for Mg-bearing silicate minerals, may not be viable for highly ... |
author |
Rim, Guanhe Roy, Noyonika Zhao, Diandian Kawashima, Shiho Stallworth, Phillip Greenbaum, Steven G. Park, Ah-Hyung Alissa |
author_facet |
Rim, Guanhe Roy, Noyonika Zhao, Diandian Kawashima, Shiho Stallworth, Phillip Greenbaum, Steven G. Park, Ah-Hyung Alissa |
author_sort |
Rim, Guanhe |
title |
CO 2 utilization in built environment via the P CO 2 swing carbonation of alkaline solid wastes with different mineralogy |
title_short |
CO 2 utilization in built environment via the P CO 2 swing carbonation of alkaline solid wastes with different mineralogy |
title_full |
CO 2 utilization in built environment via the P CO 2 swing carbonation of alkaline solid wastes with different mineralogy |
title_fullStr |
CO 2 utilization in built environment via the P CO 2 swing carbonation of alkaline solid wastes with different mineralogy |
title_full_unstemmed |
CO 2 utilization in built environment via the P CO 2 swing carbonation of alkaline solid wastes with different mineralogy |
title_sort |
co 2 utilization in built environment via the p co 2 swing carbonation of alkaline solid wastes with different mineralogy |
publishDate |
2022 |
url |
http://www.osti.gov/servlets/purl/1860624 https://www.osti.gov/biblio/1860624 https://doi.org/10.1039/d1fd00022e |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_relation |
http://www.osti.gov/servlets/purl/1860624 https://www.osti.gov/biblio/1860624 https://doi.org/10.1039/d1fd00022e doi:10.1039/d1fd00022e |
op_doi |
https://doi.org/10.1039/d1fd00022e |
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Faraday Discussions |
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230 |
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187 |
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1772813844009189376 |