Hydration Activity and Carbonation Characteristics of Dicalcium Silicate in Steel Slag: A Review

Hao, Na; Wang, Yajun; Zhang, Xi; Li, Junguo; Zeng, Yanan; Liu, Pengyao

doi:10.3390/met11101580

Cited by 17 publications

(6 citation statements)

References 100 publications

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“…The main mineral phases are 2CaO•SiO 2 , 3CaO•SiO 2 and RO (metal oxide) phases. [29][30][31][32] The steel slag produced by different smelting methods and equipment is quite different. The composition and performance of different steel slags are also quite different, so there is also a gap in the effective utilization rate of steel slags.…”

Section: Challenge In Utilization Of Steel Slagmentioning

confidence: 99%

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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Section: Challenge In Utilization Of Steel Slagmentioning

confidence: 99%

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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“…Reviewed the precipitation process of the dicalcium silicate phase in steel slag 2021 [32] Steel slag valorization via mineral carbonation…”

Section: Ongoing Developments In Steel Slag Carbonation For Building ...mentioning

confidence: 99%

“…Wang et al, in addition, reviewed the development of steel slag in carbon dioxide sequestration [31]. Furthermore, the precipitation process of the dicalcium silicate phase in steel slag was examined by Na et al [32].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Potential Factors Affecting Steel Slag Carbonation

Baras,

Li,

et al. 2023

Processes

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Steel slag is a solid waste product generated during the carbonation stage of steelmaking. It has high levels of heavy metals and substantial amounts of free calcium and magnesium oxide, making it unsuitable for use as a cement material. Furthermore, the disposal of steel slag in landfills requires many resources and can seriously contaminate the surrounding environment. One method of reducing its negative environmental impact is carbonation, which involves reacting steel slag with carbon dioxide to form stable minerals. However, many parameters influence the carbonation efficiency of steelmaking slag, including temperature, time, particle size, pressure, CO2 concentration, liquid-to-solid ratio, moisture content, humidity, additives, etc. To this end, this paper comprehensively reviews the most important steel slag carbonation-influencing factors. Moreover, it compares the characteristics from two perspectives based on their causes and effects on carbonation. Finally, this article reviews earlier studies to identify the factors that affect steel slag carbonation and the potential of carbonated steel slag as a sustainable construction material. Based on previous research, it systematically examines all the elements for future work that need to be improved.

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“…As a by-product of steelmaking, the annual production of steel slag in China amounts to more than 100 million tons [ 25 ]. Steel slag has more C 3 S and C 2 S in it, which has potential cementing activity [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Mineral Admixture from Iron Tailings with Steel Slag-Desulfurization Ash and Its Application to Concrete

et al. 2022

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Iron tailing solid waste not only has a high annual output but also has a low comprehensive utilization rate. Low utilization rate of iron tailings seriously restricts the development of comprehensive utilization of solid waste. In order to prepare an iron tailings-based ternary solid waste admixture and to verify its application to concrete, first, the effect of solid waste synergy on the strength of an iron tailings-steel slag-desulfurization ash admixture (ISD) system was investigated. Second, the effect of chemical activator dosing on the strength of an ISD system was studied and the mechanism of chemical activator action on the ISD system was investigated by thermogravimetric analysis (TG-DTA) Then, the effect of this admixture on the strength of concrete was studied. Finally, the mechanism of the effect of this admixture on the strength of concrete was clarified by mercury intrusion porosimetry (MIP) and backscattering electron tests (BSE). The results showed that the 7 d and 28 d compressive strengths of the ISD admixture were significantly higher than those of iron tailings single admixture. The 7 d and 28 d compressive strengths of the ISD system reached 24.9 MPa and 36.1 Mpa, respectively, when the ratio of iron tailings:steel slag:desulfurization ash = 1:1:1. Na2SiO3 is suitable for the early strength agent of the ISD admixture, but the amount of admixture should not exceed 0.6% of the admixture. TG-DTA shows that Na2SiO3 is enhancing the early strength of the ISD system by promoting the consumption of Ca(OH)2 in the ISD system to produce C-S-H. However, in the late reaction of the ISD system, Na2SiO3 inhibits the late strength development of the ISD system by suppressing Ca(OH)2 production. Concrete with ISD dosing of 30% or less meets the C40 requirement. MIP and BSE show that ISD provides a filling effect to concrete, but also causes a reduction in the active reactants of concrete and the combined effect of microfilling and active effects affects the strength development of ISD concrete. This study provides a theoretical and scientific basis for the preparation of iron tailings-based ternary solid waste dopants, and, in addition, the study promotes the consumption of iron tailings solid waste and the development of multiple solid waste dopants.

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Hydration Activity and Carbonation Characteristics of Dicalcium Silicate in Steel Slag: A Review

Cited by 17 publications

References 100 publications

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

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

Evaluation of Potential Factors Affecting Steel Slag Carbonation

Preparation of Mineral Admixture from Iron Tailings with Steel Slag-Desulfurization Ash and Its Application to Concrete

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Hydration Activity and Carbonation Characteristics of Dicalcium Silicate in Steel Slag: A Review

Cited by 17 publications

References 100 publications

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

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

Evaluation of Potential Factors Affecting Steel Slag Carbonation

Preparation of Mineral Admixture from Iron Tailings with Steel Slag-Desulfurization Ash and Its Application to Concrete

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Product

Resources

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

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