Use Of Olivine For The Production Of MgO-SiO2 Binders

Nye, Scott Allan; Shah, Vineet; Oze, Christopher; Barnaby, Shanks; Chris, Cheeseman

doi:10.3389/fbuil.2021.640243

Cited by 6 publications

(2 citation statements)

References 38 publications

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“…Also, the Si‐rich, Mg‐bearing amorphous phase detected only in weathered diopside samples could possibly be an amorphous magnesium silicate hydrate (M‐S‐H) secondary phase. Note that the broad band observed in the 3,000–4,000 cm −1 region of the IR spectra of the diopside sample after batch experiments (Figure S14 in Supporting Information ) can be associated with the asymmetrical stretching and bending vibrations of O‐H bonds, respectively, indicating presence of Mg‐OH and/or Fe‐OH vibrations (Nye et al., 2021). Formation of M‐S‐H phases has been reported in numerous scenarios (Roosz et al., 2015 and refs therein), including some related to the alteration of silicate materials (e.g., cement and borosilicate glass) (Dauzeres et al., 2016; De Weerdt & Justnes, 2015; de Ruiter and Austrheim, 2017) and during the injection of CO 2 ‐charged water into basalt (CarbFix project), where the predominant secondary mineral formed was a Mg‐Fe‐rich silicate phase (Oelkers et al., 2019).…”

Section: Discussionmentioning

confidence: 99%

Kinetics and Mechanisms of Acid‐pH Weathering of Pyroxenes

Monasterio-Guillot

Rodríguez-Navarro

Ruíz-Agudo

2021

Geochem Geophys Geosyst

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Pyroxenes are among the main constituent of basic and ultrabasic igneous rocks. Because they form at high P and T conditions They are not thermodynamically in equilibrium at the Earth surface and will transform into more stable phases by an irreversible thermodynamic process (Frings & Buss, 2019). Weathering is a first-order process that enables life on Earth, as the solutes released during chemical weathering serve as nutrients, and these reactions represent the first step of the biogeochemical cycle of most elements (Frings & Buss, 2019). In this sense, chain silicates are important contributors of Mg, Ca and Fe to natural waters (Marini, 2006). Also, the kinetics of primary silicate chemical weathering controls erosion rates and soil formation (Frings & Buss, 2019). Weathering of Ca, Mg-containing silicates is as well of relevance due to its role in controlling the composition of the atmosphere acting as long-term sink for CO 2 , and therefore in the global climate (e.g., Chen & Brantley, 1998).Chemical weathering under acidic conditions occurs in a wide range of scenarios on Earth, including volcanic environments, soils as well as monument stones subjected to acid rain (Simão et al., 2006), or acid mine drainage sites (e.g. Hellmann et al., 2012). Additionally, from a technological point of view, these pH conditions are relevant for in situ geological CO 2 storage in rocks (pH around 3, Shao et al., 2013). This process requires the release of the divalent metal cations contained in the structure of the silicate mineral, which then react with dissolved CO 2 and precipitate as carbonates (mineral carbonation, Daval et al., 2009). The rate limiting step for this process is considered to be the release of divalent cations from the silicate structure, and in the specific case of pyroxenes, their low reactivity is claimed to be responsible for the overall low conversion into carbonates, compared for example with olivine and serpentine under similar conditions (Meyer, 2014). Thus, knowledge of the kinetics and mechanisms of pyroxene weathering under different experimental conditions may help to optimize the conditions to obtain maximum carbonate yields.Despite the importance of the weathering of Ca, Mg-bearing pyroxenes, there are relatively few studies that have addressed the dissolution kinetics of these minerals, and in particular of augite (Schott & Berner, 1985;Siegel & Pfannkuch, 1984), as compared to other minerals such as feldspars or olivine. Also, there

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Section: Discussionmentioning

confidence: 99%

Kinetics and Mechanisms of Acid‐pH Weathering of Pyroxenes

Monasterio-Guillot

Rodríguez-Navarro

Ruíz-Agudo

2021

Geochem Geophys Geosyst

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“…In summary, the use of magnesium silicate minerals offers a potentially low carbon method to produce globally significant quantities of MgO. It should be noted that in addition to MgO, the mineral recovery process also generates a highly reactive silica that can be used along with the MgO to form an effective cement [35].…”

Section: Mgo From Mg-silicatesmentioning

confidence: 99%

MgO-based cements – Current status and opportunities

Bernard,

Nguyen,

Kawashima

et al. 2023

RILEM Tech Lett

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The cement industry is a major contributor to the anthropogenic CO2 emissions, with about 8% of all emissions coming from this sector. The global cement and concrete association has set a goal to achieve net-zero CO2 concrete by 2050, with 45% of the reduction coming from alternatives to Portland cement, substitution, and carbon capture and utilization/storage (CCU/S) approaches. Magnesia-based cements offer a conceivable solution to this problem due to their potential for low-to-negative CO2 emissions (CCU/S) but also being alternatives to Portland cement. The sources of magnesia can come from magnesium silicates or desalination brines which are carbon free for raw-material-related emissions (cf. carbonated rocks). This opens up possibilities for low or even net-negative carbon emissions. However, research on magnesia-based cements is still in its early stages. In this paper, we summarize the current understanding of different MgO-based cements and their chemistries: magnesia oxysulfate cement, magnesia oxychloride cement, magnesia carbonate cement, and magnesia silicate cement. We also discuss relevant research needed for MgO-based cements and concretes including the issues relating to the low pH of these cements and suitability of steel reinforcement. Alternatives reinforcements, suitable admixtures, and durability studies are the most needed for the further development of MgO-based concretes to achieve a radical CO2 reduction in this industry. Additionally, techno-economic and life cycle assessments are also needed to assess the competition of raw materials and the produced binder or concrete with other solutions. Overall, magnesia-based cements are a promising emerging technology that requires further research and development to realize their potential in reducing CO2 emissions in the construction industry.

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Advances in the carbonation of MgO-based binder and CO2 utilization in the construction industry

Onyekwena

Xue

et al. 2023

Clean Techn Environ Policy

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Use Of Olivine For The Production Of MgO-SiO2 Binders

Cited by 6 publications

References 38 publications

Kinetics and Mechanisms of Acid‐pH Weathering of Pyroxenes

Kinetics and Mechanisms of Acid‐pH Weathering of Pyroxenes

MgO-based cements – Current status and opportunities

Advances in the carbonation of MgO-based binder and CO2 utilization in the construction industry

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