Performance evaluation for carbonation of steel-making slags in a slurry reactor
Abstract
CO(2) sequestration by the aqueous carbonation of steel-making slag under various operational conditions was investigated in this study. The effects of the operational conditions, including type of steel-making slag, reaction time, reaction temperature, and CO(2) flow rate, on the performance of the carbonation process were evaluated. The results indicated that the BOF slag had the highest carbonation conversion, approximately 72%, at a reaction time of 1h, an operating pressure of 101 kPa and a temperature of 60°C due to its higher BET surface area of BOF slag compared to UF, FA, and BHC slags. The major factors affecting the carbonation conversion are reaction time and temperature. The reaction kinetics of the carbonation conversion can be expressed by the shrinking-core model. The measurements of the carbonated material by the SEM and XRD instruments provide evidence indicating the suitability of using the shrinking-core model in this investigation. Comparison of the results with other studies suggests that aqueous carbonation by slurry reactor is viable due to its higher mass transfer rate.
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In aqueous carbonation experiments of slag at temperatures between 30 and 80°C, measured CO2 sequestration capacity peaked at approximately 60°C.
“A similar phenomenon was also obtained in [133] in which the aqueous carbonation experiments of slag were performed at temperatures ranging between 30 and 80 • C. The measured CO 2 sequestration capacity of slag peaked at approximately 60 • C.”
From An overview of utilizing CO2 for accelerated carbonation treatment in the concrete industry (2022) · cites this paper as [133]
To achieve maximum potential of CO2 sequestration of slag, temperature control in carbonation treatment is crucial.
“To achieve the maximum potential of CO 2 sequestration of slag, temperature control in carbonation treatment is crucial [46,114,133], as highlighted in Sections 3.1 and 3.2.”
From An overview of utilizing CO2 for accelerated carbonation treatment in the concrete industry (2022) · cites this paper as [133]
Slight decrease in CO2 sequestration capacity after 50 or 60°C can be attributed to rapid growth of calcite layers on surface of slag particles.
“The slight decrease in the CO 2 sequestration capacity after 50 or 60 • C in [46,133] can be attributed to the rapid growth of the calcite layers on the surface of slag particles, as discussed in Sections 3.1 and 3.2.”
From An overview of utilizing CO2 for accelerated carbonation treatment in the concrete industry (2022) · cites this paper as [133]
Sulfamic acid volatilizes and/or decomposes at a significant rate by 400°C, which will affect the recovery of Mg.
“However, sulfamic acid volatilizes and/or decomposes at a significant rate by 400 1C, which will affect the recovery of Mg. 121,122”
From A review of mineral carbonation technologies to sequester CO <sub>2</sub> (2014) · cites this paper as [121]
Modest recovery of magnesium (50-60%) is currently limiting the two-step ammonium salt technology.
“Moreover, modest recovery of magnesium (50-60%) is currently limiting this technology.121”
From A review of mineral carbonation technologies to sequester CO <sub>2</sub> (2014) · cites this paper as [121]
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- Authors
- Chang, E.-E., Chen, C.-H., Chen, Y.-H., Pan, S.-Y., & Chiang, P.-C.
- Affiliations
- Taipei Medical University (TW)
- National Taiwan University (TW)
- National Taipei University of Technology (TW)
- Corresponding author
- Chiang, Pen-Chi
- Venue
- Journal of Hazardous Materials
- Publisher
- Elsevier BV
- Published
- 2011-02
- Volume
- 186
- Issue
- 1
- Pages
- 558-564
- ISSN
- 0304-3894 (ISSN-L)
- OpenAlex
- W2053562890
- Cited by
- 240
- References
- 4
- Citations by year
- 2026: 18 · 2025: 41 · 2024: 28 · 2023: 23 · 2022: 9 · 2021: 26 · 2020: 10 · 2019: 17 · 2018: 9 · 2017: 5 · 2016: 12 · 2015: 9 · 2014: 12 · 2013: 11 · 2012: 9
- FWCI
- 6.46
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Hazardous Materials (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Science Council
- Topics
- Physical Sciences › Environmental Science › Environmental Engineering › CO2 Sequestration and Geologic Interactions
- Physical Sciences › Engineering › Civil and Structural Engineering › Concrete and Cement Materials Research
- Physical Sciences › Engineering › Mechanical Engineering › Carbon Dioxide Capture Technologies
- Keywords
- steel slag, aqueous carbonation, CO2 sequestration, slurry reactor, basic oxygen furnace slag, carbonation conversion, shrinking core model, carbonation kinetics, reaction temperature, reaction time (chemistry), CO2 flow rate, mass transfer
- MeSH terms
- Carbon Dioxide, Kinetics, Microscopy, Electron, Scanning, Steel, Thermogravimetry, X-Ray Diffraction
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