CO2 utilization in built environment via the PCO2 swing carbonation of alkaline solid wastes with different mineralogy

Rim, Guanhe; Roy, Noyonika; Zhao, Diandian; Kawashima, Shiho; Stallworth, P.E.; Greenbaum, Steve; Park, Ah‐Hyung Alissa

doi:10.1039/d1fd00022e

Cited by 26 publications

(44 citation statements)

References 83 publications

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“…20,21 It can be expected that utilizing industrial wastes as the feedstock to extract Ca is economically promising, as it reduces the material cost. 22,23 Moreover, the polymorphs of calcium carbonates vary accordingly (vaterite, aragonite, and calcite), depending on the operating processes (e.g., pH, temperature, the ratio between Ca and carbonic ions, and aging time), which will affect their applications. 24 There are two main categories of the ex situ mineralization process: direct (singlestep) and indirect (two-step) carbonation.…”

Section: Introductionmentioning

confidence: 99%

“…To address these intense challenges, carbon capture, utilization, and storage (CCUS) is a promising technology combining the industrial waste treatment with the carbon mineralization process to form carbonates. CO 2 mineralization is the process simulating the natural weathering reaction, which converts CO 2 into solid carbonates for permanent storage. , It can be expected that utilizing industrial wastes as the feedstock to extract Ca is economically promising, as it reduces the material cost. , Moreover, the polymorphs of calcium carbonates vary accordingly (vaterite, aragonite, and calcite), depending on the operating processes (e.g., pH, temperature, the ratio between Ca and carbonic ions, and aging time), which will affect their applications . There are two main categories of the ex situ mineralization process: direct (single-step) and indirect (two-step) carbonation .…”

Section: Introductionmentioning

confidence: 99%

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Upcycling Construction and Demolition Waste into Calcium Carbonates: Characterization of Leaching Kinetics and Carbon Mineralization Conditions

Zhang

Moment

2023

ACS Sustainable Chem. Eng.

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Carbon mineralization is a technology that fixes CO2 permanently into solid carbonates via the reaction between CO2 and alkaline substances. In our studies, we used Ca-bearing industrial waste (i.e., construction and demolition waste) as the feedstock to produce high-purity calcium carbonates. We aim to integrate valorization of solid wastes and CO2 emission mitigation in our process. To achieve qualified products and fast kinetics, the reaction routes can be divided into two main processes: a dissolution process with acid followed by a two-step carbonation reaction. The advantages of this multistage process are obtaining products with high purity, tailored morphology, and narrowed particle size distribution. Conducting effective carbon mineralization requires a comprehensive understanding of the kinetics of the dissolution process, and it was found that the rate-limiting step is diffusion due to the intrinsic properties of the feedstock. In the subsequent carbonation process, impurities (Al, Fe, and Si) from the leachate were selectively removed as their oxides prior to the carbonation reaction, through pH swing, leveraging differential solubilities. Subsequent carbonation with bubbled CO2 under controlled conditions produced calcium carbonate with tunable forms between vaterite, aragonite, and calcite. The variations of the particle size distribution and the shape of the solid were monitored in real time through a Blaze900 probe from BlazeMetrics Co., which provided optical information, facilitating a better understanding of the kinetics and mechanisms of the dissolution and crystallization processes. Thus, alkaline industrial waste can be efficiently and sustainably utilized through the carbon mineralization pathway.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Upcycling Construction and Demolition Waste into Calcium Carbonates: Characterization of Leaching Kinetics and Carbon Mineralization Conditions

Zhang

Moment

2023

ACS Sustainable Chem. Eng.

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“…An early example of this technology used CaO and Ca(OH) 2 which easily dissolve and increase the bicarbonate concentration in ocean water (Kheshgi, 1995). Most CaO and Ca(OH) 2 are currently produced from Earth abundant limestone (CaCO 3 ) (Kenny and Oates, 2007;Kantzas et al, 2022), but they can also be derived from industrial alkaline wastes such as mine tailings, waste-to-energy ashes, iron and steel slag, and waste concrete (Renforth, 2019;Bui Viet et al, 2020;Gadikota, 2021;Hong et al, 2021;Rim et al, 2021). Since limestone already contains one carbon per calcium, a maximum of only 1 mol of additional CO 2 can be captured by producing bicarbonate solutions from CaCO 3 .…”

Section: Enhanced Carbon Sequestration In the Ocean Via Added Alkalinitymentioning

confidence: 99%

Harvesting, storing, and converting carbon from the ocean to create a new carbon economy: Challenges and opportunities

Vibbert

Park

2022

Front. Energy Res.

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Ever-increasing anthropogenic CO2 emissions have required us to develop carbon capture, utilization, and storage (CCUS) technologies, and in order to address climate change, these options should be at scale. In addition to engineered systems of CO2 capture from power plants and chemical processes, there are emerging approaches that include the Earth (i.e., air, Earth, and ocean) within its system boundary. Since oceans constitute the largest natural sink of CO2, technologies that can enhance carbon storage in the ocean are highly desired. Here, we discuss alkalinity enhancement and biologically inspired CO2 hydration reactions that can shift the equilibrium of ocean water to pump more carbon into this natural sink. Further, we highlight recent work that can harvest and convert CO2 captured by the ocean into chemicals, fuels, and materials using renewable energy such as off-shore wind. Through these emerging and innovative technologies, organic and inorganic carbon from ocean-based solutions can replace fossil-derived carbon and create a new carbon economy. It is critical to develop these ocean-based CCUS technologies without unintended environmental or ecological consequences, which will create a new engineered carbon cycle that is in harmony with the Earth’s system.

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“…Among the alkaline waste resources discussed for forming carbonate minerals are cement kiln dust as well as construction and demolition wastes [48]. Recent work has begun to explore potential CCUS through enforced carbonation of cement fines from recycled concrete as an SCM [39,49,50]. Commercialized products have included injecting flux CO2 into fresh concrete, which has limited direct carbon sequestration potential, but can be used to achieve similar concrete strengths with lower cement contents [40].…”

Section: Mineralized Co2 In Concrete Productionmentioning

confidence: 99%

Opportunities and challenges for engineering construction materials as carbon sinks

et al. 2021

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Population growth and urbanization over the coming decades are anticipated to drive unprecedented demand for infrastructure materials and energy resources. Unfortunately, factors such as the degree of resource consumption, the energy-intensive nature of production, and the chemical-reaction driven emissions make infrastructure materials production industries among the greatest contributors to anthropogenic CO2 emissions. Yet there is an often-overlooked potential environmental benefit to infrastructure materials: most remain in use for decades and their long service lives can facilitate extended storage of carbon. In this perspective, we present an overview of recent technological advancements that can support infrastructure materials acting as a global, distributed carbon sink and discuss areas for further research and development. We present mechanisms to quantify the extent to which the embodied carbon will be removed from the carbon cycle for a long enough period of time to provide carbon sequestration and climate benefit. We conclude that it is possible to unlock the vast potential to engineer a carbon sequestration system that simultaneously meets societal need for expanding infrastructure systems; however, complexities in how these systems are engineered must be systematically and quantitatively incorporated into materials design.

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CO₂ utilization in built environment via the P_CO2 swing carbonation of alkaline solid wastes with different mineralogy

Abstract: Carbon mineralization to solid carbonates is one of the reaction pathways that can not only utilize captured CO2 but also potentially store them in the long term. In this study,...

Cited by 26 publications

References 83 publications

Upcycling Construction and Demolition Waste into Calcium Carbonates: Characterization of Leaching Kinetics and Carbon Mineralization Conditions

Upcycling Construction and Demolition Waste into Calcium Carbonates: Characterization of Leaching Kinetics and Carbon Mineralization Conditions

Harvesting, storing, and converting carbon from the ocean to create a new carbon economy: Challenges and opportunities

Opportunities and challenges for engineering construction materials as carbon sinks

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