Carbonation of steel slag and gypsum for building materials and associated reaction mechanisms

Wang, Xue; Wen, Ning; Li, Jiajie; Zhang, Siqi; Hitch, Michael; Pascual, Rodrigo

doi:10.1016/j.cemconres.2019.105893

Cited by 143 publications

(42 citation statements)

References 44 publications

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“…The XRD patterns of the three samples are shown in Figure 5. The A2A-28 days sample mainly consisted of the hydration product of the calcium silicates, such as some amorphous C-S-H gels, that cannot be detected though XRD; all of hydration products are prone to take part in the carbonation reaction and mainly produce carbonation products, such as calcite and monocarbonate (Wang et al, 2019). There were diffraction peaks of calcite were in the XRD patterns when the A2 paste was subjected to the accelerated carbonation curing treatment (Yu and Wang, 2011).…”

Section: Xrd Patternsmentioning

confidence: 99%

Effect of Different CO2 Treatments on the Metal Leaching in Steel Slag Binders

et al. 2021

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Carbonation is an effective method to promote the quality of the steel slag binder. In this article, two carbonation approaches, namely hot-stage carbonation and accelerated carbonation, were employed to leach the metals, and the influence mechanism on the metal sequential leachability of the binders composed of 80 wt% of EAF slag incorporating 20 wt% of Portland cement (PC) was revealed. The carbonate products, microstructures, and chemical states were investigated, and the results indicated that chromium, vanadium, and titanium gradually transformed into inactive phases after two carbonation approaches, while zinc appeared the opposite trend. The sequential leachability of chromium declined with the increase of the carbonation efficiency, in which the exchangeable chromium decreased from 1.99 mg/kg in the A2A binder to below the detection limit in the A2C binder and C2C binder. Hot-stage carbonation treatment facilitated particle agglomeration, minerals remodeling, and calcite formation. The carbonation curing of the steel slag paste resulted in the formation of amorphous CaCO3, calcite crystalline and Si-bearing hydrates that covered the pores of the matrix, and silicate structure with a higher disorder. The hot-stage carbonation and accelerated carbonation curing methods were adopted to jointly prevent the leaching of harmful metals and facilitate promising high-volume steel slag-based binders with structural densification and CO2 storage.

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Section: Xrd Patternsmentioning

confidence: 99%

Effect of Different CO2 Treatments on the Metal Leaching in Steel Slag Binders

et al. 2021

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“…Due to the high reactivity of solid wastes and for energy saving purposes, room temperature is mostly used in the studies. Recycled concrete aggregates [6], blast furnace slag [7], fly ash [8], and steel slag [9] are several main CO 2 capture feedstocks. Most of the research revealed that carbon curing helped enhance the mechanical properties of the samples and their resistance to the environment [10].…”

Section: Introductionmentioning

confidence: 99%

Use of CO2 to Cure Steel Slag and Gypsum-Based Material

Wang

Wen

et al. 2021

Energies

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To improve the utilization of steel slag (SS) in CO2 capture and making building materials, the paper mainly discussed the effects of desulphurization gypsum (DG) and w/s ratio on strength development and CO2 capture capability of high Al content SS. It showed that 10 wt% DG enhanced the strength of hydration-curing SS by 262% at 28 days. Similarly, adding 6 wt% DG in carbonation-curing SS contributed to increases in strength and CO2 uptake by 283% and 33.54%, reaching 42.68 MPa and 19.12%, respectively. Strength decreases and CO2 uptake increases with w/s. Microanalysis (QXRD, SEM-EDS, TG-DTG, FTIR, XPS, and MIP) revealed that the main hydration products of SS were C-S-H gel and C4AH13, which transformed to ettringite with DG addition. The carbonation products were mainly calcite and aragonite. Additionally, the amount of aragonite, mechanically weaker than calcite, decreased and calcite increased significantly when DG was added in carbonation-curing samples, providing a denser structure and higher strength than those without DG. Furthermore, high Al 2p binding energies revealed the formation of monocarboaluminate in the DG-added carbonation samples, corresponding to higher CO2 uptake. This study provides guidance for the preparation of SS-DG carbide building materials.

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“…Yan et al prepared reactive powder concrete using fly ash and steel slag powder [8]. Wang et al improved the strength of steel slag to produce building materials by the carbonization of steel slag and gypsum [9]. Liao et al investigated the effect of steel slag on the hydration and strength development of calcium sulfoaluminate cement [10].…”

Section: Introductionmentioning

confidence: 99%

Effect of Al2O3–SiO2 Addition on Gehlenite Growth and the Mechanical Performance of Steel Slag

Song

Cao

et al. 2021

Crystals

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Steel slag, as industrial solid waste, is difficult to recycle owing to its complex components and poor mechanical properties. However, steel slag can be modified by adding Al2O3–SiO2 through high temperature sintering, which would improve the mechanical properties and expand the scope of its application. The phase changing, morphology evolution and the mechanical properties of the modified steel slag were investigated. The results indicate that the main phase changes to gehlenite occur with increasing temperature. The compressive strength increases to 115 MPa at 1350 °C. The relationship of the quantity of gehlenite and the compressive strength were explored.

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Carbonation of steel slag and gypsum for building materials and associated reaction mechanisms

Cited by 143 publications

References 44 publications

Effect of Different CO2 Treatments on the Metal Leaching in Steel Slag Binders

Effect of Different CO2 Treatments on the Metal Leaching in Steel Slag Binders

Use of CO2 to Cure Steel Slag and Gypsum-Based Material

Effect of Al2O3–SiO2 Addition on Gehlenite Growth and the Mechanical Performance of Steel Slag

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