| Title: | Sequestration capacity of bio-based ashes and influence of carbonation on the leaching behavior depending on their mineralogical composition |
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| Authors: | ID Tominc, Sara (Author)
ID Pavlin, Majda (Author)
ID Žibret, Lea (Author)
ID Ducman, Vilma (Author)
ID Lisbeth M., Ottosen (Author) |
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| Files: |  URL - Source URL, visit https://doi.org/10.1016/j.ceramint.2025.11.229
URL - Research data, visit http://hdl.handle.net/20.500.12556/DiRROS-23902
 PDF - Presentation file, download (5,37 MB)
MD5: 3868F91F2038D116D58932CA539B8D04
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| Language: | English |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: |  ZAG - Slovenian National Building and Civil Engineering Institute
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| Abstract: | Mineral CO2 sequestration is a promising carbon capture and storage approach based on the chemical reaction of CO2 with alkaline materials containing Ca- and Mg-rich (hydr)oxides and silicates. This results in the formation of relatively insoluble and storable carbonates. This study investigates six ashes of different origins and chemical compositions to assess their CO2 sequestration potential and leaching behavior, offering insights into their environmental impact and potential risks. The carbonation experiments were conducted under controlled laboratory conditions and the CO2 sequestration capacity was quantified using a pressure calcimeter, supported by thermogravimetric analysis. Wood ashes and ash from the co-combustion of biomass from a paper mill showed the highest carbonation potential, with CO2 sequestration capacities between 344.8 and 432.3 g CO2 per kg of ash and carbonation efficiencies between 82.4 % and 94.4 %. In addition to the high sequestration capacity of the ashes, carbonation was found to affect the leaching behavior of the ash in the environment by changing its mineralogical composition. The process consistently reduced pH and generally decreased the leaching of certain trace elements, except for Mo, and Cr. Nevertheless, the reduction in the leachability of several elements suggests a partial environmental benefit of carbonation. The findings highlight the dual functionality of the carbonation: it provides a viable route for the permanent binding of CO2 and can enhance the stabilization of industrial residues. However, the persistence of metal leaching indicates that its overall effectiveness in mitigating environmental risks associated with residue disposal or reuse remains material-dependent. |
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| Keywords: | enforced carbonation, maximum sequestration capacity, leaching, heavy metals, mineralogy, bio-based ash |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Publication date: | 17.11.2025 |
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| Publisher: | Elsevier |
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| Year of publishing: | 2025 |
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| Number of pages: | str. 65512-65523 |
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| Numbering: | Vol. 51, Issue 30, Part C |
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| PID: | 20.500.12556/DiRROS-25200  |
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| UDC: | 54 |
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| ISSN on article: | 1873-3956 |
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| DOI: | 10.1016/j.ceramint.2025.11.229 |
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| COBISS.SI-ID: | 258501635 |
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| Copyright: | © 2025 The Authors |
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| Note: |
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| Publication date in DiRROS: | 13.01.2026 |
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| Views: | 115 |
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| Downloads: | 86 |
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