Carbonation of argon oxygen decarburization stainless steel slag and its effect on chromium leachability

Wang, Yajun; Zeng, Yanan; Li, Junguo; Zhang, Yuzhu; Zhao, Qingzhong

doi:10.1016/j.jclepro.2020.120377

Cited by 41 publications

(26 citation statements)

References 48 publications

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“…The XRD patterns of AODS and PC are presented in Figure 2. It was found that dicalcium silicate was the predominant mineral phase in AODS, while fluorite, periclase, merwinite, and chromium spinel were also detected, supporting conclusions of other researches on AODS [3,13]. The four typical clinker mineral phases, including dicalcium silicate, tricalcium silicate, tricalcium aluminate, and calcium aluminoferrite, were all detected in the PC [45].…”

Section: Properties Of Raw Materialssupporting

confidence: 79%

“…Due to the presence of hydratable C 2 S phases, AODS has cementitious properties [12]. In previous research, the specific surface area of fresh AODS was determined to be 511 m 2 /g [13], which facilitates its application as a cement substitute [14].…”

Section: Introductionmentioning

confidence: 99%

“…Except for cementitious characteristics, the potential environmental issues related to the leaching risk of chromium must be considered when AODS was utilized as a cement substitute. The recycling of AODS was very limited due to its high Cr content (0.5-5 wt.%) [13,[25][26][27]. Studies have shown that the chromium leaching risk of AODS is usually underestimated [7].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Cementitious Behavior of Argon Oxygen Decarburization Stainless Steel Slag and Its Stabilization on Chromium

Wang

Zeng

et al. 2020

Crystals

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The study mainly aims at the potential of Argon Oxygen Decarburization Slag (AODS) as a supplementary cementitious material and explores the mechanisms of stabilization/solidification (S/S) of chromium in cement-based composite pastes. The basic cementitious parameters, such as water requirement, setting time, soundness, hydration characteristics, and strength indexes of composite binders, were examined through standard methods. The results showed that the most beneficial mineral phase in AODS for cementitious behavior was beta dicalcium silicate (β-C2S). The utilization of a higher AODS dosage in composite binders increased the water requirement and the setting time, while it decreased the hydration heat and the strength indexes. Although the AODS possessed limited cementitious properties, it conformed the Grade II steel slag powder qualified for concrete and cement. Sequential leaching tests were conducted targeting the leachability of chromium in the pastes with different AODS dosage and curing time. Results showed that with the lower AODS dosage and the longer curing time, the S/S efficiency for chromium leaching from the composite paste was better. Utilization of AODS as a cement substitute not only can recycle this solid waste and decrease the emission of CO2 concerning cement production, but also helps to effectively reduce the chromium leaching risk.

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Section: Properties Of Raw Materialssupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cementitious Behavior of Argon Oxygen Decarburization Stainless Steel Slag and Its Stabilization on Chromium

Wang

Zeng

et al. 2020

Crystals

Self Cite

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“…Under the condition of 19 bar CO 2 pressure, 100 • C, and particle size less than 38 µm, the maximum carbonation degree of steel slag in 30 min reaches 74% of the total Ca content of steel slag. Wang et al [118] studied the effect of the carbonation rate of AOD slag on chromium's leaching rate from slag. The experimental results show that the maximum carbonation rate of AOD slag is 50~52% (L/S = 0.4 mL/g, P CO 2 = 7.5 bar, t > 6 h), but the chromium leaching rate of 52% carbonated AOD slag (7.9 mg/kg) is higher than that of the original AOD slag (6 mg/kg); 23% carbonated AOD slag has the lowest chromium leaching rate (1.7 mg/kg).…”

Section: Sequestration Of Carbon Dioxidementioning

confidence: 99%

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

Hao

Wang

Zhang

et al. 2021

Metals

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Dicalcium silicate is one of the main mineral phases of steel slag. Ascribed to the characteristics of hydration and carbonation, the application of slag in cement production and carbon dioxide sequestration has been confirmed as feasible. In the current study, the precipitation process of the dicalcium silicate phase in steel slag was discussed. Meanwhile, the study put emphasis on the influence of different crystal forms of dicalcium silicate on the hydration activity and carbonation characteristics of steel slag. It indicates that most of the dicalcium silicate phase in steel slag is the γ phase with the weakest hydration activity. The hydration activity of γ-C2S is improved to a certain extent by means of mechanical, high temperature, and chemical activation. However, the carbonation activity of γ-C2S is about two times higher than that of β-C2S. Direct and indirect carbonation can effectively capture carbon dioxide. This paper also summarizes the research status of the application of steel slag in cement production and carbon dioxide sequestration. Further development of the potential of dicalcium silicate hydration activity and simplifying the carbonation process are important focuses for the future.

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“…Stainless steel slag is a byproduct of manufacturing stainless steel from scrap iron in electric furnace arcs. Approximately, producing one ton of stainless steel would generate about 1/4-1/3 ton of slag wastes, including oxidizing slag and reducing slag associated with the preprocessing (steel making) and post processing (steel refining) stages, respectively [3,4]. The former slag is a byproduct of aggregate, and the latter is formed as dust with mean particle size of around 3 μm.…”

Section: Introductionmentioning

confidence: 99%

Performance of Self-compacting Concrete with Stainless Steel Slag Versus Fly Ash as Fillers: A Comparative Study

Sheen¹,

Lam

2021

Period. Polytech. Civil Eng.

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Recently, stainless steel slag -a byproduct of manufacturing stainless steel is accepted as a cementitious material, the chemical characteristics of which are highly variant. This study reuses two types of stainless steel reducing slag with specific surface area of 1766 cm2/g (S1) and 7970 cm2/g (S2) in developing self-compacting concrete (SCC). Particularly, two S2-blended SCCs incorporating with S1 and fly ash as fillers (calling as S-mix and F-mix) were prepared for a comparative investigation. In both SCCs, ordinary Portland cement was replaced by S2 with various ratios (from 0 % to 50 %, increment 10 %). Testing results show that in fresh state, the F-mix exhibits higher workability and longer initial setting time than those of S-mix. In hardened state, 10 % compressive strength loss was realized as increasing S2 content up to 30 % in the both SCCs; the strength of F-mix is up to 1.9 times of S-mix at the same rate of S2 replacement. Water absorption of the F-mix was below 3 %, suggested as a “good” quality concrete; whilst the S-mix could be longs to an “average” one. Resistivity and sulfate resistance of F-mix are considerably higher than those of S-mix. Moreover, based on the obtained data, compressive strength and electrical resistivity are correlated well with a logarithmic form.

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Carbonation of argon oxygen decarburization stainless steel slag and its effect on chromium leachability

Cited by 41 publications

References 48 publications

Cementitious Behavior of Argon Oxygen Decarburization Stainless Steel Slag and Its Stabilization on Chromium

Cementitious Behavior of Argon Oxygen Decarburization Stainless Steel Slag and Its Stabilization on Chromium

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

Performance of Self-compacting Concrete with Stainless Steel Slag Versus Fly Ash as Fillers: A Comparative Study

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