Influence of Natural and Accelerated Carbonation of Steel Slags on Their Leaching Behavior

Spanka, Marina; Mansfeldt, Tim; Bialucha, R

doi:10.1002/srin.201500370

Cited by 10 publications

(1 citation statement)

References 29 publications

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“…According to the A2A and A2C images, the iron-containing substances (such as RO phase and brownmillerite) were involved in the carbonation reaction just to a less extent, and the uncarbonated calcium silicates core surrounded the Ca-leached and Si-rich layers (Quaghebeur et al, 2015). Physical encapsulation of the carbonate, which generated under such a carbonation ratio, reduced the hydrolysis of the primary mineral phases and then immobilized the metal, such as chromium (Spanka et al, 2016).…”

Section: Sem-eds Analysismentioning

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: Sem-eds Analysismentioning

confidence: 99%

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

et al. 2021

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Sequential extraction of chromium, molybdenum, and vanadium in basic oxygen furnace slags

Spanka

Mansfeldt

Bialucha

2018

Environ Sci Pollut Res

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Basic oxygen furnace slags (BOS) are by-products of basic oxygen steel production. Whereas the solubility of some elements from these slags has been well investigated, information about the mineralogy and related leaching, i.e., availability of the environmentally relevant elements chromium (Cr), molybdenum (Mo), and vanadium (V), is still lacking. The aim of this study was to investigate these issues with a modified, four-fraction-based, sequential extraction procedure (F1-F4), combined with X-ray diffraction, of two BOS. Extractants with increasing strength were used (F1 demineralized water, F2 CHCOOH + HCl, F3 NaEDTA + NHOH·HCl, and F4 HF + HNO + HO), and after each fraction, X-ray diffraction was performed. The recovery of Cr was moderate (66.5%) for one BOS, but significantly better (100.2%) for the other one. High recoveries were achieved for the other elements (Mo, 100.8-107.9% and V, 112.6-87.0%), indicating that the sequential extraction procedure was reliable when adapted to BOS. The results showed that Cr and Mo primarily occurred in F4, representing rather immobile elements under natural conditions, which were strongly bound into/onto Fe minerals (srebrodolskite, magnetite, hematite, or wustite). In contrast, V was more mobile with proportional higher findings in F2 and F3, and the X-ray diffraction results reveal that V was not solely bound into Ca minerals (larnite, hatrurite, kirschsteinite, and calcite), but also bound to Fe minerals. The results indicated that the total amount of recovery was a poor indicator of the availability of elements and did not correspond to the leaching of elements from BOS.

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Long-term leaching characterization and geochemical modeling of chromium released from AOD slag

Liu

Wang

et al. 2019

Environ Sci Pollut Res

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Influence of Natural and Accelerated Carbonation of Steel Slags on Their Leaching Behavior

Cited by 10 publications

References 29 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

Sequential extraction of chromium, molybdenum, and vanadium in basic oxygen furnace slags

Long-term leaching characterization and geochemical modeling of chromium released from AOD slag

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