Insights into chemical stability of Mg-silicates and silica in aqueous systems using 25Mg and 29Si solid-state MAS NMR spectroscopy: Applications for CO2 capture and utilisation

Benhelal, Emad; Hook, James M.; Rashid, Muhammad Imran; Zhao, Guangyu; Oliver, T.K.; Rayson, Mark S.; Brent, Geoff F.; Stockenhuber, Michael; Kennedy, Eric M.

doi:10.1016/j.cej.2020.127656

Cited by 24 publications

(12 citation statements)

References 42 publications

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“…Semi-quantitative XRD and TGA-MS analyses revealed that the dunite sample was composed of 61%-62% lizardite, 30%-33% olivine, 3.8%-8.3% brucite, and a minor quantity of magnetite (0.6%). XRD analysis of heat-activated dunite ( Figure 5) shows that heat activation completely transformed lizardite to more reactive Mg-silicate X-ray amorphous phases as observed and reported before [24] and dehydroxylated brucite to MgO. The dominant crystalline phases in the heat-activated dunite were olivine and magnetite, which remained unchanged after heat activation.…”

Section: Feedstock Phase Identification and Analysissupporting

confidence: 65%

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Magnesium Leachability of Mg-Silicate Peridotites: The Effect on Magnesite Yield of a Mineral Carbonation Process

et al. 2020

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The aim of this study was to increase feedstock availability for mineral carbonation. Acid dissolution and carbonic acid dissolution approaches were used to achieve higher Mg extractions from peridotites. Acid dissolution studies of raw dunite, heat-activated dunite, heat-transformed dunite, and twin sister dunite have not been reported in the literature. Heat-activated dunite is more reactive as compared to heat-transformed dunite, raw dunite, and twin sister dunite. The fraction of magnesium extracted from heat-activated dunite was 57% as compared to 18% from heat-transformed dunite, 14% from raw dunite, and 11% from twin sister dunite. Similarly, silicon and iron extractions were higher for heat-activated dunite compared to that of heat-transformed dunite, raw dunite, and twin sister dunite. Materials rich in forsterite (twin sister dunite and heat-transformed dunite) showed preferential Mg release and exhibited incongruent dissolution similar to that of forsterite. Heat-activated dunite (amorphous magnesium silicate rich) on the other hand behaved differently and showed congruent dissolution. Olivine did not dissolve under carbonic acid dissolution (with concurrent grinding) and acidic conditions. Under carbonic acid dissolution with concurrent grinding conditions, olivine was partially converted into nanometer sized particles (d10 = 0.08 µm) but still provided 16% Mg extraction during 4 h of dissolution.

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Section: Feedstock Phase Identification and Analysissupporting

confidence: 65%

“…One of the key considerations for developing efficient mineral carbonation technology is to increase Mg extraction from feedstock. For this purpose, acid dissolution of magnesium silicate minerals was studied previously [15,[21][22][23][24]. Park et al used different acid solutions and grinding media to increase Mg extraction [25,26].…”

Section: Introductionmentioning

confidence: 99%

Magnesium Leachability of Mg-Silicate Peridotites: The Effect on Magnesite Yield of a Mineral Carbonation Process

et al. 2020

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“…The 29 Si NMR spectra of the nanocomposites are shown in Figure 12. From Figure 12A, in the C0.8, a broad hump with the chemical shift of around –63 ppm corresponded to Q 0 , which represented isolating silica unit 37 . Therefore, these results once again testified to the defective structure of C0.8.…”

Section: Resultsmentioning

confidence: 73%

Calcium‐silicate‐hydrates/polycarboxylate ether nanocomposites doped by magnesium: Enhanced stability and accelerating effect on cement hydration

et al. 2022

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C‐S‐H/PCE (calcium‐silicate‐hydrates/polycarboxylate ether) nanocomposites have a significant accelerating effect on early hydration and early strength development of cementitious materials. In this study, magnesium ions are doped into C‐S‐H/PCE nanocomposites, and it is found that C‐S‐H/PCE nanocomposites doped by appropriate magnesium ions have much better stability. Besides, the accelerating effects of the modified nanocomposites on early cement hydration also get improved. The doped magnesium ions displace calcium ions and promote the absorption of PCE. Moreover, the incorporation of magnesium ions results in two unique morphologies of nanocomposites, that is, globule and gel. The globules are semi‐crystalline similar to C‐S‐H, while the gels are amorphous and have more branched silicate chains.

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“…Reduction in greenhouse gases is a need of time. Significant research has been published regarding mineral carbonation [2][3][4][5][6][7][8][9][10][11][12][13][14][15], geological carbon dioxide storage, oceanic storage [3], carbon dioxide conversion into chemicals, carbon dioxide fixation in polymers and carbon dioxide conversion into Urea [16,17]. Mineral carbonation is one of the forefront technologies recently proposed.…”

Section: Introductionmentioning

confidence: 99%

Testing and Validating Instruments for Feedstocks of Mineral Carbonation

Rashid¹

2022

Mineralogy

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Different feedstocks Dunite, Olivine and Lizardite are examined in this research using various measuring techniques such as TGA-MS, XRD and Quantitative XRD and EDS. Quantitative XRD results matched with TGA-MS results. Malvern Mastersizer, EDS and QXRD results also showed a good match regarding the individuality of results which are shown graphically. TGA-MS calibration curves example is provided. Matching the results of different measuring techniques is a key to fundamental research. Comparison of the reactivity of dunite, soaked dunite, heat-activated dunite and lizardite and raw dunite soaked has been performed. TGA-MS and QXRD results match each other. Malvern Mastersizer, EDS and QXRD results match with their individual results indicating the instrument’s reliability. Semi-Quantitative XRD results authenticity is EXCELLENT. TGA-MS results match with QXRD is excellent. Mineral carbonation converts CO2 into stable mineral carbonates. This research explores the utilisation of serpentinised dunite (which is comprised of 61% lizardite) as a potential feedstock for mineral carbonation. Heat activation, ex-situ regrinding and concurrent grinding techniques were employed to enhance the reaction rate and yield, and to provide information on the carbonation reaction mechanism. Silica-rich layers that appeared during reference experiments were disrupted using concurrent grinding and significantly higher magnesite yields and Mg extractions were obtained.

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Insights into chemical stability of Mg-silicates and silica in aqueous systems using 25Mg and 29Si solid-state MAS NMR spectroscopy: Applications for CO2 capture and utilisation

Cited by 24 publications

References 42 publications

Magnesium Leachability of Mg-Silicate Peridotites: The Effect on Magnesite Yield of a Mineral Carbonation Process

Magnesium Leachability of Mg-Silicate Peridotites: The Effect on Magnesite Yield of a Mineral Carbonation Process

Calcium‐silicate‐hydrates/polycarboxylate ether nanocomposites doped by magnesium: Enhanced stability and accelerating effect on cement hydration

Testing and Validating Instruments for Feedstocks of Mineral Carbonation

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