Development of Ultrafine Mineral Admixture from Magnesium Slag and Sequestration of CO2

Ye, Junhao; Liu, Songhui; Zhao, Yue; Li, Yuan; Jingrui, Fang; Zhang, Haibo; Guan, Xiaohong

doi:10.3390/buildings13010204

Cited by 7 publications

(9 citation statements)

References 60 publications

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“…The carbonates were calculated according to Equation (1). On the other hand, the CO2 percentage was calculated based on the mass loss from 500 °C to 800 °C [34][35][36]. ) × 100%…”

Section: Evaluation Methodsmentioning

confidence: 99%

Assessment of CO2 Capture in FA/GGBS-Blended Cement Systems: From Cement Paste to Commercial Products

Liu,

Wu,

et al. 2024

Buildings

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The cement industry’s intricate production process, including kiln heating and fossil fuel use, contributes 5–8% of global CO2 emissions, marking it as a significant carbon emitter in construction. This study focuses on quantifying CO2 capture potential in blended cement systems through the utilisation of phenolphthalein and thermalgravimetric methodologies. Its primary objective is to assess the CO2 absorption capacity of these blended systems’ pastes. Initial evaluation involves calculating the carbon capture capacity within the paste, subsequently extended to estimate CO2 content in the resultant concrete products. The findings indicate that incorporating ground granulated blast-furnace slag (GGBS) or an ettringite-based expansive agent did not notably elevate carbonation depth, irrespective of their fineness. Conversely, the introduction of fly ash (FA) notably augmented the carbonation depth, leading to a substantial 36.4% rise in captured CO2 content. The observed distinctions in carbonation behaviour primarily stem from variances in pore structure, attributable to distinct hydration characteristics between GGBS and FA. Thermal analysis confirms the increased stabilisation of CO2 in FA blends, highlighting the crucial influence of material composition on carbonation and emission reduction. Incorporating both GGBS and FA notably diminishes binder emissions, constituting almost half of PC-concrete emissions. Initially, 60% GGBS shows lower emissions than 50% FA, but when considering CO2 capture, this emission dynamic significantly changes, emphasising the intricate influence of additives on emission patterns. This underscores the complexity of evaluating carbonation-induced emissions in cementitious systems.

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“…The carbonates were calculated according to Equation (1). On the other hand, the CO2 percentage was calculated based on the mass loss from 500 °C to 800 °C [34][35][36]. ) × 100%…”

Section: Evaluation Methodsmentioning

confidence: 99%

Assessment of CO2 Capture in FA/GGBS-Blended Cement Systems: From Cement Paste to Commercial Products

Liu,

Wu,

et al. 2024

Buildings

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“…The pH value of the MS suspension was monitored in real time using a precision digital pH meter (REX PHS-3C model) [37]. Before injecting CO 2 into the system, the pH data-recording interval was set to every 30 s. This was done to promptly record the initial pH value of the suspension before the reaction started and observe the changes that occurred over time.…”

Section: Ph Changesmentioning

confidence: 99%

“…The composition of MS is primarily comprised of magnesium oxide (MgO) and other metal oxides (such as iron oxide, calcium oxide, etc. ), with minimal variation between the components [37]. So far, MS has mainly been applied in areas such as filling cementitious materials and road-based materials [38][39][40].…”

Section: Introductionmentioning

confidence: 99%

“…Mo et al used MS as a raw material and adopted accelerated carbonation to prepare calcium carbonate binders with a compressive strength of up to 119.5 MPa [42,43]. Furthermore, there have been reports indicating that MS can be used to produce aragonite through wet carbonation at room temperature [37]. These studies not only demonstrate the feasibility of MS in accelerated carbonation techniques but also reveal its potential as a precursor for preparing aragonite whiskers.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Aragonite Whiskers by Co-Carbonation of Waste Magnesia Slag and Magnesium Sulfate: Enhancing Microstructure and Mechanical Properties of Portland Cement Paste

Ye,

Liu,

Fang

et al. 2023

Buildings

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This study focused on the synthesis of aragonite whiskers through a synergistic wet carbonation technology utilizing waste magnesia slag (MS) and magnesium sulfate (MgSO4), aiming to improve the microstructure and mechanical properties of ordinary Portland cement (OPC) paste. The influence of MgSO4 concentration on the wet carbonation process, phase composition, and microstructure of MS was investigated. Furthermore, the effect of incorporating carbonated MS (C-MS) on the mechanical properties and microstructure of Portland cement paste was evaluated. Results showed that appropriate MgSO4 concentrations favored aragonite whisker formation. A concentration of 0.075 M MgSO4 yielded 86.6% aragonite with high aspect ratio nanofibers. Incorporating 5% of this C-MS into OPC increased the seven-day compressive strength by 37.5% compared to the control OPC paste. The improvement was attributed to accelerated hydration and reduced porosity by the filling effect and microfiber reinforcement of aragonite whiskers. MS demonstrated good CO2 sequestration capacity during carbonation. This study provides an effective method to synthesize aragonite whiskers from waste MS and use it to enhance cementitious materials while reducing CO2 emissions, which is valuable for the development of a sustainable cement industry.

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“…Among various mineral carbonation options, the carbonation of magnesium slag has attracted increasing interest in recent years [25] . Magnesium slag is a byproduct of magnesium smelting processes, primarily consisting of calcium oxide (CaO), silicon dioxide (SiO 2 ), and magnesium oxide (MgO).…”

Section: Introductionmentioning

confidence: 99%

Unveiling the Carbonation Behavior and Microstructural Changes of Magnesium Slag at 0 ℃

Junhao Ye,

Songhui Liu,

Jingrui Fang

et al. 2023

Jour. of build. mater. Sci.

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Magnesium slag (MS) is an industrial byproduct with high CO2 sequestration potential. This study investigates the carbonation behavior and microstructural changes of MS during wet carbonation at 0 °C. XRD, TG, FTIR, SEM, and BET techniques were used to characterize the phase composition, microstructure, and porosity of MS samples carbonated for different durations. The results showed that the main carbonation products were calcite, vaterite, and highly polymerized silica gel, with particle sizes around 1 μm. The low-temperature environment retarded the carbonation reaction rate and affected the morphology and crystallization of calcium carbonate. After 480 min of carbonation, the specific surface area and porosity of MS increased substantially by 740% and 144.6%, respectively, indicating improved reactivity. The microstructure of carbonated MS became denser with calcite particles surrounded by silica gel. This study demonstrates that wet carbonation of MS at 0 °C significantly enhances its properties, creating an ultrafine supplementary cementitious material with considerable CO2 sequestration capacity.

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Development of Ultrafine Mineral Admixture from Magnesium Slag and Sequestration of CO2

Cited by 7 publications

References 60 publications

Assessment of CO2 Capture in FA/GGBS-Blended Cement Systems: From Cement Paste to Commercial Products

Assessment of CO2 Capture in FA/GGBS-Blended Cement Systems: From Cement Paste to Commercial Products

Synthesis of Aragonite Whiskers by Co-Carbonation of Waste Magnesia Slag and Magnesium Sulfate: Enhancing Microstructure and Mechanical Properties of Portland Cement Paste

Unveiling the Carbonation Behavior and Microstructural Changes of Magnesium Slag at 0 ℃

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