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Cited by 6CO2 Sequestration and Geologic InteractionsCarbon Dioxide Capture TechnologiesConcrete and Cement Materials Research

What controls the labile cations content in ultramafic minerals and tailings for carbon capture and storage: An experimental approach

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Lu, Xueya, Dipple, Gregory M., Turvey, Connor C.·2025·International Journal of Greenhouse Gas Control
DOI 10.1016/j.ijggc.2025.104315
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Abstract

The growing demand for effective carbon mineralization technologies to combat climate change requires precise reactivity characterization of feedstocks. In this study, we introduced and validated a batch dissolution experimental protocol for rapid and straightforward quantification of labile Mg, a representative indicator of carbon mineralization reactivity derived from ultramafic rocks, minerals, and tailings. This method was applied to characterize labile Mg content in various ultramafic minerals, including serpentine and hydrotalcite group minerals, as well as rocks like serpentinite, dunite, harzburgite, and tailings. Results indicate that, within the serpentine group, antigorite exhibits the lowest labile Mg content, whereas chrysotile releases the most. Differences in labile Mg content within the hydrotalcite group were found to be dependent on trivalent cation species, with pyroaurite and iowaite (Fe3+ rich) demonstrating higher labile Mg compared to stichtite and hydrotalcite (Cr3+ rich). We find that grain size impacts reactive surface area for ultramafic rocks and tailings, while protolith composition and rock alteration stages affect mineralogy. Consequently, under consistent geochemical conditions, we identified reactive surface area and mineral composition as primary controls of labile Mg content. Principal Component Analysis (PCA) was employed to validate these findings further. Prediction of labile Mg content based on these variables yielded results comparable to experimental outcomes, providing insight into carbon mineralization reactivity and demonstrating methods for accurate evaluation.

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  • Hydrotalcite reactivity under ambient conditions is limited and the release of Mg2+ ions is largely dependent on the solubility of Cr3+, Al3+, and Fe3+ trivalent cations.

    “However, hydrotalcite reactivity under ambient conditions is limited and the release of Mg2+ ions is largely dependent on the solubility of Cr3+, Al3+, and Fe3+ trivalent cations43.”

    From Low temperature carbonation and CO2 mineral trapping in altered hydrotalcite-rich ultrmafic rocks (2025) · cites this paper as [43]

  • Specific conditions can markedly improve hydrotalcite carbonation kinetics despite its aluminum content.

    “While hydrotalcite is considered less reactive due to its aluminum content, which can impede ion exchange and structural rearrangements necessary for carbonation43, our findings suggest that specific conditions can markedly improve its carbonation kinetics.”

    From Low temperature carbonation and CO2 mineral trapping in altered hydrotalcite-rich ultrmafic rocks (2025) · cites this paper as [43]

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Authors
Lu, X., Dipple, G. M., & Turvey, C. C.
Affiliations
University of British Columbia (CA)
Corresponding author
Lu, Xueya
ORCID
Venue
International Journal of Greenhouse Gas Control
Publisher
Elsevier BV
Published
2025-02
Volume
141
Pages
104315
ISSN
1750-5836 (ISSN-L)
DOI
10.1016/j.ijggc.2025.104315
OpenAlex
W4406408625
Cited by
6
References
106
Citations by year
2026: 1 · 2025: 5
FWCI
1.66
Type
journal article
Language
en
Open access
Licence
Locations
  • International journal of greenhouse gas control (publishedVersion, cc-by-nc-nd)
  • SSRN Electronic Journal (acceptedVersion)
Funders
  • University of British Columbia
  • College of Sciences - Department of Ocean and Earth Sciences
  • Natural Sciences and Engineering Research Council of Canada
Topics
  • Physical Sciences › Environmental Science › Environmental Engineering › CO2 Sequestration and Geologic Interactions
  • Physical Sciences › Engineering › Mechanical Engineering › Carbon Dioxide Capture Technologies
  • Physical Sciences › Engineering › Civil and Structural Engineering › Concrete and Cement Materials Research
Keywords
mine tailings, carbon capture and storage, mineral reactivity, geochemical modeling, CO2 mineralization

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