On the carbonation of brucite: Effects of Mg-acetate on the precipitation of hydrated magnesium carbonates in aqueous environment

Nguyen, Hoang; Santos, Herbert Henrique de Melo; Sreenivasan, Harisankar; Kunther, Wolfgang; Carvelli, Valter; Illikainen, Mirja; Kinnunen, Päivö

doi:10.1016/j.cemconres.2021.106696

Cited by 26 publications

(60 citation statements)

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“…Given that giorgiosite is a relatively new hydrated Mg carbonate phase in the literature, more follow-up research is needed to understand its thermodynamic role in the Mg carbonates series. 151 Note that for a large-scale (many tonnes per hour) CO 2 mineralisation process, the use of chemical additives requires that these are almost completely recovered for re-use for economically viable operation.…”

Section: Conventional Systems Of Magnesite Precipitationmentioning

confidence: 99%

“…The effects were attributed to the catalytic activity due to the increased ionic strength, which may have contributed to decreasing the activity and the thickness of the second hydration layer of the Mg(H 2 O) 6 2+ cations. 68 Nguyen et al 151 evaluated the effect of Mg acetate (from 0.01 to 1 M concentration) as an additive on the carbonation of brucite at ambient temperature and pressure. Acetate was found to enhance the reaction kinetics and degree of reaction in which brucite reached ca.…”

Section: Thermodynamic Enigma Of the Magnesite Problemmentioning

confidence: 99%

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Mechanisms of Mg carbonates precipitation and implications for CO₂ capture and utilization/storage

Santos

Nguyen

Venâncio

et al. 2023

Inorg. Chem. Front.

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Section: Conventional Systems Of Magnesite Precipitationmentioning

confidence: 99%

Section: Thermodynamic Enigma Of the Magnesite Problemmentioning

confidence: 99%

Mechanisms of Mg carbonates precipitation and implications for CO₂ capture and utilization/storage

Santos

Nguyen

Venâncio

et al. 2023

Inorg. Chem. Front.

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“…A1 a model is given where its formation was prevented. The presence of organic as acetate showed a faster reaction of brucite into hydrated magnesium carbonates phases (HMC) [71,72], although the organics do not significantly change the Mg concentrations [73]. While developing M-S-H cement, it was shown that sodium phosphate was an excellent dispersant and acted as superplasicizer [30].…”

Section: Formation Of M-s-h Stability and Competition With Brucite Fo...mentioning

confidence: 99%

“…The hydration of MgO blended with hydromagnesite (Mg 5 (CO 3 ) 4 (OH) 2 ・4H 2 O) shows the formation of HMC products, some poorly crystalline brucite and adequate compressive strength [26,35]. The utilisation of Mg-acetate accelerated the formation of HMCs, lead to a higher carbonation degree [71] and stabilise the hydrated Mg-carbonates phases [72].…”

Section: M-(a-)s-h Stability Vs Carbonates Phasesmentioning

confidence: 99%

Research progress on magnesium silicate hydrate phases and future opportunities

Bernard

2022

RILEM Tech Lett

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This short letter summaries the latest research on the structure and thermodynamic modelling of the magnesium silicate hydrates (M-S-H) phases. M-S-H structure is comparable to hydrated clays, with a smaller and rounder microstructures compared to clay platelets. Similar to clay minerals, M-S-H can incorporate ions such as aluminium and hydrated exchangeable cations to compensate the negative surface charge. This fundamental understanding of M-S-H structure allowed to develop structure-based thermodynamic models, which can further help to optimise the conditions for M-S-H formation and its use as cementitious materials. Optimized binders containing M-S-H have the advantages of presenting: i) good mechanical properties, ii) dense microstructure and potentially good resistances to leaching and iii) low pH values. These types of binders could therefore be used for cement products with non-steel reinforcement, for the encapsulation of specific wastes, for products containing natural fibres or for the clay stabilisation, etc.

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“…As the typical inorganic alkaline materials, Mg- and Ca-based binders have been frequently investigated. − Reactive magnesia (MgO) and calcium hydroxide (Ca(OH) 2 ) as carbonatable binders have attracted increasing attention as their reaction involves the absorption of significant amounts of CO 2 . , Recent studies have demonstrated that carbonated MgO or Mg(OH) 2 compacts exhibit excellent mechanical strength through the formation of an interlocking network of hydrated magnesium carbonates (HMCs) . Dong et al conducted an in-depth investigation of the formation of HMCs under different conditions and confirmed the precipitation of nesquehonite (MgCO 3 ·3H 2 O) at a higher pH value and the formation of dypingite [Mg 5 (CO 3 ) 4 (OH) 2 ·5H 2 O] at a lower pH value.…”

Section: Introductionmentioning

confidence: 99%

Elucidating the Interaction Mechanism of Mg(OH)₂ and Ca(OH)₂ under Enforced Carbonation

Zhang

Liu

Wang

et al. 2023

ACS Sustainable Chem. Eng.

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There is a potential for leveraging the synergy of carbonation of portlandite and Mg-based binders to improve the CO 2 uptake, mechanical property, and thermodynamic stability of Mg-and Ca-based binders and enable its application. This work reports insights into the carbonation behavior of Mg(OH) 2 −Ca(OH) 2 (MH−CH) mixtures including the precipitation of different carbonates, degree of reaction of each phase, mechanical properties, microstructure characterization, and thermodynamic stability. Results indicate that the compressive strength and degree of carbonation (DOC) of compacts increase first and then decrease with the increase of the Ca(OH) 2 content. The compact containing 25% Ca(OH) 2 yields the highest compressive strength of 91.4 MPa, while the compact containing 75% Ca(OH) 2 has the highest DOC of 91.2%. The formation of nesquehonite with a lower density in compacts with lower contents of Ca(OH) 2 (0 and 25%) results in a higher volume increase even at a very low DOC (14.2%), leading to a more densified structure in the compacts. Compacts with higher contents of Ca(OH) 2 (50, 75, and 100%) precipitate calcite and magnesium calcite with higher thermodynamic stability than nesquehonite and improved water stability. Meanwhile, the high temperature in the initial stage of Ca(OH) 2 carbonation causes severe water evaporation and insufficient water in compacts, thus restricting the continuous carbonation at the center having a lower DOC than the surface. The mixing of Mg(OH) 2 and Ca(OH) 2 significantly enhances the carbonation degree of both hydroxides, which may be explained by the complementation of Ca(OH) 2 and Mg(OH) 2 carbonation, in which the water released by the carbonation of Ca(OH) 2 is bound to the crystal structure of hydrated magnesium carbonates (HMCs) from Mg(OH) 2 carbonation.

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On the carbonation of brucite: Effects of Mg-acetate on the precipitation of hydrated magnesium carbonates in aqueous environment

Cited by 26 publications

References 50 publications

Mechanisms of Mg carbonates precipitation and implications for CO₂ capture and utilization/storage

Mechanisms of Mg carbonates precipitation and implications for CO₂ capture and utilization/storage

Research progress on magnesium silicate hydrate phases and future opportunities

Elucidating the Interaction Mechanism of Mg(OH)₂ and Ca(OH)₂ under Enforced Carbonation

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On the carbonation of brucite: Effects of Mg-acetate on the precipitation of hydrated magnesium carbonates in aqueous environment

Cited by 26 publications

References 50 publications

Mechanisms of Mg carbonates precipitation and implications for CO2 capture and utilization/storage

Mechanisms of Mg carbonates precipitation and implications for CO2 capture and utilization/storage

Research progress on magnesium silicate hydrate phases and future opportunities

Elucidating the Interaction Mechanism of Mg(OH)2 and Ca(OH)2 under Enforced Carbonation

Contact Info

Product

Resources

About

Mechanisms of Mg carbonates precipitation and implications for CO₂ capture and utilization/storage

Mechanisms of Mg carbonates precipitation and implications for CO₂ capture and utilization/storage

Elucidating the Interaction Mechanism of Mg(OH)₂ and Ca(OH)₂ under Enforced Carbonation