Pilot-scale experimental work on carbon dioxide sequestration using steelmaking slag

Said, Arshe; Laukkanen, Timo; Järvinen, Mika

doi:10.1016/j.apenergy.2016.05.136

Cited by 72 publications

(35 citation statements)

References 21 publications

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“…For instance, aragonite, which is generally formed at elevated temperature, can be obtained at lower temperature in the presence of impurities such as magnesium (Park et al, 2008). Said et al (2016) also demonstrated aragonite PCC production via the Slag2PCC process. In order to avoid the evaporation of ammonia (NH3) in the NH4Cl solution, the operation was conducted at 45°C.…”

Section: Effect Of Temperature On the Formation Of Caco3 Polymorphsmentioning

confidence: 97%

“…Interestingly, however, the final PCC product was found to be rhombohedral calcite, rather than vaterite or aragonite, which often have been found at similar pH ranges in the previous model chemical studies. They also synthesized calcium carbonates via the slag2PCC process by varying the CO2 flow rate in a pH range of ~9 to ~7 at 45°C, and it was found that both calcite and aragonite formed but the composition ratio depended more strongly on the CO2 flow rate than the pH condition (Said et al, 2016). In conclusion, pH condition affects the formation of polymorphs of calcium carbonate by shifting the equilibrium concentration of coronate species (e.g., HCO 3 − , CO 3 2− ) or changing the Ca−CO 3 binding strength, but other operating factors such as temperature, CO2 flow rate, presence of acid and bases, and carbonation time also appear to more significantly influence the determination of the polymorphs (Saruhashi, 1955;Gómez-Morales et al, 1996a,b).…”

Section: Effect Of Ph On the Formation Of Caco3 Polymorphsmentioning

confidence: 99%

“…Recently, a precipitated calcium carbonate (PCC) production technology utilizing steel converter (basic oxygen furnace) slag as a calcium source, referred to as Slag2PCC, has been developed and demonstrated successfully by researchers at Aalto university together with their collaborators (Said et al, 2013(Said et al, , 2016. The process includes ammonium salt (e.g., NH4Cl) based calcium extraction and carbonation steps, and it can be operated in both batch and continuous modes.…”

Section: Utilization Of Precipitated Mineral Carbonatesmentioning

confidence: 99%

“…The production of PCC using steel converter slag via the slag2PCC process was investigated by Zevenhoven and coworkers (Eloneva et al, 2008b;Said et al, 2013Said et al, , 2016. The slag2PCC process includes two stages of Ca extraction and carbonation, based on the recirculation of an aqueous ammonium salt solution .…”

Section: Effect Of Ph On the Formation Of Caco3 Polymorphsmentioning

confidence: 99%

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Calcium Carbonate Precipitation for CO2 Storage and Utilization: A Review of the Carbonate Crystallization and Polymorphism

et al. 2017

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The transformation of CO2 into a precipitated mineral carbonate through an ex situ mineral carbonation route is considered a promising option for carbon capture and storage (CCS) since (i) the captured CO2 can be stored permanently and (ii) industrial wastes (i.e., coal fly ash, steel and stainless-steel slags, and cement and lime kiln dusts) can be recycled and converted into value-added carbonate materials by controlling polymorphs and properties of the mineral carbonates. The final products produced by the ex situ mineral carbonation route can be divided into two categories-low-end high-volume and high-end low-volume mineral carbonates-in terms of their market needs as well as their properties (i.e., purity). Therefore, it is expected that this can partially offset the total cost of the CCS processes. Polymorphs and physicochemical properties of CaCO3 strongly rely on the synthesis variables such as temperature, pH of the solution, reaction time, ion concentration and ratio, stirring, and the concentration of additives. Various efforts to control and fabricate polymorphs of CaCO3 have been made to date. In this review, we present a summary of current knowledge and recent investigations entailing mechanistic studies on the formation of the precipitated CaCO3 and the influences of the synthesis factors on the polymorphs.

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Section: Effect Of Temperature On the Formation Of Caco3 Polymorphsmentioning

confidence: 97%

Section: Effect Of Ph On the Formation Of Caco3 Polymorphsmentioning

confidence: 99%

Section: Utilization Of Precipitated Mineral Carbonatesmentioning

confidence: 99%

Section: Effect Of Ph On the Formation Of Caco3 Polymorphsmentioning

confidence: 99%

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Calcium Carbonate Precipitation for CO2 Storage and Utilization: A Review of the Carbonate Crystallization and Polymorphism

et al. 2017

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“…In addition, CaCO 3 by-products produced by this process can be used in other industries for cement production, paper filling/coating additives and plastic/paint manufacturing according to purity and varying particle sizes [18,19]. Numerous studies have been undertaken recently on the carbon mineralization processes using Ca-rich alkaline solution from various sources, focusing on the production and characterization of CaCO 3 particles (e.g., rhombic calcite, orthorhombic aragonite, spherical vaterite; µ-CaCO 3 ) [15,[20][21][22][23].…”

Section: Co2(g) → Co2(aq)mentioning

confidence: 99%

An Eco-Friendly Neutralization Process by Carbon Mineralization for Ca-Rich Alkaline Wastewater Generated from Concrete Sludge

Yoo

Shin

2017

Metals

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Waste-concrete recycling processes using wet-based crushing methods inevitably generate a large amount of alkaline concrete sludge, as well as wastewater, which contains abundant Ca ions. The Ca-rich alkaline wastewater must then be neutralized for reuse in the waste-concrete recycling process. In this study, the feasibility of a carbon mineralization process for the neutralization of alkaline wastewater was considered from both environmental and economic perspectives. The optimal reaction time, efficiency of Ca removal and CO 2 sequestration as a function of the CO 2 gas flow rate were assessed. The carbon mineralization process resulted in sequestering CO 2 (85-100% efficiency) and removing Ca from the solution (84-99%) by precipitating pure CaCO 3 . Increasing the gas flow rate reduced the reaction time (65.0 down to 3.4 min for 2.5 L of solution), but decreased CO 2 sequestration (from 463.3 down to 7.3 mg CO 2 for 2.5 L of solution). Optimization of the gas flow rate is essential for efficient CO 2 sequestration, Ca removal, CaCO 3 production and, therefore, successful wastewater neutralization following the wet-based crushing process. The method presented here is an eco-friendly and economically viable substitute for dealing with alkaline wastewater. It may also provide a practical guide for the design of carbon mineralization processes for the neutralization of alkaline solutions containing large amounts of Ca.

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Research progress of hydrogen production and CO₂ fixation in molten slag cooling process

Zhou,

Li,

Meng

et al. 2024

Carbon Neutralization

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Steel slag is a waste discharged from the iron and steel smelting process, which has the characteristics of large output, high temperature, complex chemical composition and poor stability. The application of steel slag in hydrogen production and CO2 fixation is of great significance for reducing energy consumption, obtaining renewable energy and fixing CO2 in the air. In this paper, the research progress of high‐temperature sensible heat of steel slag used for hydrogen production and CO2 fixation at medium and low temperature is introduced, the reaction mechanism of different hydrogen production methods and the treatment path and direction of high‐efficiency hydrogen production in the future are deeply analyzed, and the steel slag used for CO2 fixation is discussed and summarized from the theory, effect and treatment mode of CO2 fixation. In the future, the research on the economic benefits of hydrogen production and CO2 fixation from steel slag is a major focus, which can achieve economic benefits while utilizing steel slag resources.

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Pilot-scale experimental work on carbon dioxide sequestration using steelmaking slag

Cited by 72 publications

References 21 publications

Calcium Carbonate Precipitation for CO2 Storage and Utilization: A Review of the Carbonate Crystallization and Polymorphism

Calcium Carbonate Precipitation for CO2 Storage and Utilization: A Review of the Carbonate Crystallization and Polymorphism

An Eco-Friendly Neutralization Process by Carbon Mineralization for Ca-Rich Alkaline Wastewater Generated from Concrete Sludge

Research progress of hydrogen production and CO₂ fixation in molten slag cooling process

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Pilot-scale experimental work on carbon dioxide sequestration using steelmaking slag

Cited by 72 publications

References 21 publications

Calcium Carbonate Precipitation for CO2 Storage and Utilization: A Review of the Carbonate Crystallization and Polymorphism

Calcium Carbonate Precipitation for CO2 Storage and Utilization: A Review of the Carbonate Crystallization and Polymorphism

An Eco-Friendly Neutralization Process by Carbon Mineralization for Ca-Rich Alkaline Wastewater Generated from Concrete Sludge

Research progress of hydrogen production and CO2 fixation in molten slag cooling process

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Product

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Research progress of hydrogen production and CO₂ fixation in molten slag cooling process