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Microstructure and carbon storage capacity of hydrated magnesium carbonates synthesized from different sources and conditions

Dong, H and Unluer, C and Yang, EH and Jin, F and Al-Tabbaa, A (2019) Microstructure and carbon storage capacity of hydrated magnesium carbonates synthesized from different sources and conditions. Journal of CO2 Utilization, 34. pp. 353-361. ISSN 2212-9820

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Abstract

Recently, the mineral carbonation via the reaction of CO with saline aquafers received much attention as one of the most promising ways for geologic CO storage. This paper reports microstructure and carbon storage capacity of hydrated magnesium carbonates (HMCs) synthesized from different sources, i.e., reject brine and commercial Mg(OH) slurry, and under different conditions, i.e., pH (8-14) and Mg(OH) :CO molar ratio (1:1-1:7). Results show that dypingite (Mg (CO ) (OH) ·5H O) is the main phase forming at lower Mg(OH) :CO ratios. An increase in the Mg(OH) :CO ratio and/or pH leads to the precipitation of nesquehonite (MgCO ·3H O). A unique "house of cards" texture, involving formation of the rosette-like dypingite flakes on the surface of nesquehonite needles, is discovered under elevated pH and Mg(OH) :CO ratios. HMCs synthesized from reject brine exhibit a much higher carbon storage capacity of 82.6% than that produced from the commercial Mg(OH) slurry (43.7%). Findings from this study advance understanding of mineral recovery from reject brine and the capture and long-term storage of CO in the form of HMCs. 2 2 2 2 2 5 3 4 2 2 2 2 2 2 3 2 2 2 2 2

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div D > Geotechnical and Environmental
Depositing User: Unnamed user with email sms67@cam.ac.uk
Date Deposited: 03 Aug 2019 20:01
Last Modified: 10 Apr 2021 21:20
DOI: 10.1016/j.jcou.2019.07.016