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Aqueous carbonation of MgSO4 with (NH4)2CO3 for CO2 sequestration
Abstract
Mineral carbonation is an important technical option for the effective reduction of CO 2 emissions. Natural magnesium‐containing minerals, such as serpentine and blast furnace slag (BFS), have recently been used for CO 2 storage with an indirect carbonation route using ammonium sulfate. In this study, the effects of the feeding mode and process parameters on the magnesium conversion, product phase, and morphology during the aqueous carbonation of MgSO 4 with ammonium carbonate solution were investigated in detail. The results showed that the carbonation ratio with a parallel feed was higher than the forward and reverse feed by about 3–5% with a limited reaction time, and the product size was more uniform. The phase and morphology of the products were affected significantly by the temperature. The highest carbonation ratio appeared at 40°C because only 75% of magnesium was carbonated if hydromagnesite was produced. When the mole ratio of (NH 4)2 CO 3 to MgSO 4 was 2:1 and the concentration of magnesium sulfate was higher than 0.4 mol·L−1, the carbonated products contain ammonium magnesium carbonate, and the ammonia should be recovered by selective thermal decomposition. When the mole ratio decreased to 1.5:1, only nesquehonite appears with high crystallinity and uniform size. The optimized conditions were therefore selected as 40°C, a mole ratio of 1.5:1, and magnesium sulfate concentration of 0.7 mol·L−1. Under these conditions the carbonation ratio reached 88%. Additionally, the optimal initial pH of MgSO 4 solution was 9.5 (the product was nesquehonite at low pH) while the hydromagnesite will be produced at higher pH (pH more than 10). © 2019 Society of Chemical Industry and John Wiley & Sons, Ltd.
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When nesquehonite growth is hindered in the radial crystal plane, it shifts growth towards the axial crystal plane, increasing aspect ratio of obtained nesquehonite whiskers.
“The authors concluded that when the nesquehonite growth is hindered in the radial crystal plane, it shifts the growth towards the axial crystal plane, thus increasing the aspect ratio of the obtained nesquehonite's whiskers.141”
From Mechanisms of Mg carbonates precipitation and implications for CO 2 capture and utilization/storage (2023) · cites this paper as [141]
In pilot-scale carbonation of MgSO4 with (NH4)2CO3, highest carbonation ratio was obtained with parallel feeding (83.3 wt% yield), compared with forward and reverse feeding (80.4 and 78.4 wt%, respectively).
“It was observed that the highest carbonation ratio was obtained with the parallel feeding (83.3 wt% yield), when compared with the forward and reverse feeding (80.4 and 78.4 wt%, respectively).”
From Mechanisms of Mg carbonates precipitation and implications for CO 2 capture and utilization/storage (2023) · cites this paper as Deng et al. (2019)
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Mechanisms of Mg carbonates precipitation and implications for CO 2 capture and utilization/storage
Santos, H. S., Nguyen, H., Venâncio, F., Ramteke, D., Zevenhoven, R., & Kinnunen, P. (2023) · Inorganic Chemistry Frontiers · doi:10.1039/d2qi02482a · Cited by 108
Metadata
- Authors
- Deng, C., Liu, W., Chu, G., Luo, D., Zhang, G., Wang, L., Yue, H., Liang, B., & Li, C.
- Affiliations
- Sichuan University (CN)
- Corresponding author
- Li, Chun
- Venue
- Greenhouse Gases: Science and Technology
- Publisher
- Wiley
- Published
- 2019-01-20
- Volume
- 9
- Issue
- 2
- Pages
- 209-225
- ISSN
- 2152-3878 (ISSN-L)
- OpenAlex
- W2912430069
- Cited by
- 18
- References
- 1
- Citations by year
- 2026: 3 · 2025: 4 · 2024: 5 · 2023: 2 · 2022: 2 · 2021: 1 · 2019: 1
- FWCI
- 0.42
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Greenhouse Gases Science and Technology (publishedVersion)
- Funders
- Sichuan University (2017SCU12017)
- Topics
- Physical Sciences › Environmental Science › Environmental Engineering › CO2 Sequestration and Geologic Interactions
- Physical Sciences › Chemical Engineering › Filtration and Separation › Carbon Dioxide Capture Technologies
- Physical Sciences › Chemical Engineering › Process Chemistry and Technology › Carbon dioxide utilization in catalysis
- Keywords
- aqueous carbonation, CO2 mineralization, CO2 sequestration, magnesium sulfate, ammonium carbonate, ammonium sulfate, nesquehonite, hydromagnesite, feeding mode, temperature effects, molar ratio, pH effect, ammonia recovery, CO2 emission reduction
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