Reactivity of Alkaline Lignite Fly Ashes Towards CO 2 in Water
Abstract
The reaction kinetics between alkaline lignite fly ashes and CO2 (pCO2 = 0.01--0.03 MPa)were studied in a laboratory CO2 flow-through reactor at 25--75 degrees C. The reaction is characterized by three phases that can be separated according to the predominating buffering systems and the rates of CO2 uptake. Phase I (pH > 12, < 30 min) is characterized by the dissolution of lime, the onset of calcite precipitation and a maximum uptake, the rate of which seems to be limited by dissolution of CO2. Phase II (pH < 10.5, 10--60 min) is dominated by the carbonation reaction. CO2 uptake in phase III (pH < 8.3) is controlled by the dissolution of periclase (MgO) leading to the formation of dissolved magnesium-bicarbonate. Phase I could be significantly extended by increasing the solid-liquid ratios and temperature, respectively. At 75 degrees C the rate of calcite precipitation was doubled leading to the neutralization of approximately 0.23 kg CO2 per kg fly ash within 4.5 h, which corresponds to nearly 90% of the total acid neutralizing capacity.
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Alkaline paper mill wastes are suitable sorbents for mineral carbonation.
“and are therefore suitable sorbents for mineral carbonation (Table 5).”
From A review of mineral carbonation technologies to sequester CO <sub>2</sub> (2014) · cites this paper as [148]
Alkaline paper mill wastes typically contain 45-82% free CaO.
“which typically contain 45-82% 148,168 free CaO”
From A review of mineral carbonation technologies to sequester CO <sub>2</sub> (2014) · cites this paper as [148]
The CKD E CO2 uptake achieved was 8-25 wt% (0.08-0.25 t-CO2 per t-CKD,CBD) at ambient temperature and pressure in a column reactor or in a pressurized reactor.
“The CKD E CO 2 uptake achieved was 8-25 wt% (i.e.0.08-0.25 t-CO 2 per t-CKD,CBD) at ambient temperature and pressure in a column reactor 132 or in a pressurized reactor.148”
From A review of mineral carbonation technologies to sequester CO <sub>2</sub> (2014) · cites this paper as [148]
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- Authors
- Back, M., Kuehn, M., Stanjek, H., & Peiffer, S.
- Affiliations
- University of Bayreuth (DE)
- Corresponding author
- Back, Martin
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 2008-05-20
- Volume
- 42
- Issue
- 12
- Pages
- 4520-4526
- ISSN
- 0013-936X (ISSN-L)
- 1520-5851
- OpenAlex
- W2059870497
- Cited by
- 110
- References
- 4
- Citations by year
- 2026: 10 · 2025: 10 · 2024: 17 · 2023: 2 · 2022: 3 · 2021: 8 · 2020: 3 · 2018: 3 · 2017: 2 · 2016: 8 · 2015: 5 · 2014: 10 · 2013: 12 · 2012: 7
- FWCI
- 3.43
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Environmental Science & Technology (publishedVersion)
- PubMed (publishedVersion)
- Publication Database GFZ (GFZ German Research Centre for Geosciences) (submittedVersion)
- RWTH Publications (RWTH Aachen) (submittedVersion)
- Topics
- Physical Sciences › Environmental Science › Environmental Engineering › CO2 Sequestration and Geologic Interactions
- Physical Sciences › Engineering › Mechanical Engineering › Carbon Dioxide Capture Technologies
- Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Coal and Its By-products
- Keywords
- lignite fly ash, CO2 uptake, carbonation, calcite precipitation, lime dissolution, magnesium bicarbonate, acid neutralization, reaction kinetics, solid-to-liquid ratio, temperature effects, CO2 sequestration
- MeSH terms
- Alkalies, Carbon, Carbon Dioxide, Water, Particulate Matter, Coal Ash
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