Selective sulfur removal from semi-dry flue gas desulfurization coal fly ash for concrete and carbon dioxide capture applications

Ragipani, Raghavendra; Escobar, Eleanor; Prentice, Dale P.; Bustillos, Steven; Simonetti, Dante A.; Sant, Gaurav; Wang, Bu

doi:10.1016/j.wasman.2020.12.007

Cited by 28 publications

(18 citation statements)

References 32 publications

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“…Many scholars have researched FA and gypsum, including the chemical composition, cement substitute and direction preparation, mechanical characteristics and microstructural properties [12][13][14][15][16][17]. It is expected that the promotion and application of FA and gypsum to create the practical cementitious binder would become feasible [18].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Macro Mechanical Properties and Microstructures of Cement-Based Composites Prepared from Fly Ash, Gypsum and Steel Slag

Cao

Yılmaz

2021

Minerals

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Using solid wastes (SWs) as backfilling material to fill underground mined-out areas (UMOAs) solved the environmental problems caused by SWs and reduced the backfilling cost. In this study, fly ash (FA), gypsum and steel slag (SS) were used to prepare cement-based composites (CBC). The uniaxial compression, computed tomography (CT) and scanning electron microscope (SEM) laboratory experiments were conducted to explore the macro and micromechanical properties of CBC. The findings showed that the uniaxial compressive strength (UCS) of CBC with a curing time of 7 d could reach 6.54 MPa. The increase of SS content reduced the UCS of CBC, while the gypsum and FA content could increase the UCS of CBC. Microscopic studies have shown that the SS particles in CBC have noticeable sedimentation, and the increase of SS content causes the failure mode of CBC from tensile to tensile-shear. These research results can provide a scientific reference for the preparation of backfilling materials.

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Section: Introductionmentioning

confidence: 99%

Characterization of Macro Mechanical Properties and Microstructures of Cement-Based Composites Prepared from Fly Ash, Gypsum and Steel Slag

Cao

Yılmaz

2021

Minerals

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“…The addition of peroxide was required to avoid the formation of dissolved sulfur dioxide upon acidification, which was previously found to elevate overall sulfur concentration when measured using inductively coupled plasma (ICP) spectrometry. 23 The dissolved elemental concentrations in the aqueous solution were measured using inductively coupled plasma optical emission spectroscopy (ICP-OES; Varian Vista-MPX, Varian, Palo Alto, CA, USA). Reported concentrations are averages from three measurements.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…The supernatant from the batch reaction slurry was filtered using a 0.2 μ syringe filter, and the obtained aqueous solution was acidified and diluted up to 10 times using a combination of 0.5 M HNO 3 and 0.03% H 2 O 2 solutions. The addition of peroxide was required to avoid the formation of dissolved sulfur dioxide upon acidification, which was previously found to elevate overall sulfur concentration when measured using inductively coupled plasma (ICP) spectrometry . The dissolved elemental concentrations in the aqueous solution were measured using inductively coupled plasma optical emission spectroscopy (ICP-OES; Varian Vista-MPX, Varian, Palo Alto, CA, USA).…”

Section: Methodsmentioning

confidence: 99%

Direct Air Capture and Sequestration of CO₂ by Accelerated Indirect Aqueous Mineral Carbonation under Ambient Conditions

Ragipani

Sreenivasan

Anex

et al. 2022

ACS Sustainable Chem. Eng.

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Mineralization of gaseous carbon dioxide into solid carbonates using alkaline industrial residues such as coal fly ash has a dual advantage of reducing the carbon dioxide footprint of coal power plants and improving ash utilization. However, the slow mineral carbonation rate under atmospheric conditions is a major challenge, especially when using natural minerals or industrial residues for direct air capture (DAC) of CO2. In this study, using coal fly ash samples and concentrated alkali carbonate aqueous solutions as a recyclable solvent, we show the feasibility of coupling mineral carbonation with DAC under atmospheric conditions. Findings show that carbonation efficiency is best under alkaline conditions, achieving as high as ∼80% conversion to calcium carbonates within 1 h in a 1.9 M sodium carbonate solution. Based on the experimental results, a process coupling DAC and mineral carbonation that operates entirely under ambient conditions is proposed. The techno-economic and life cycle assessments for the proposed process project a levelized cost of $116–133/t-CO2-sequestered (US $2019) and process carbon emissions (GWP) in the range of 0.03–0.25 t-CO2e/t-CO2-sequestered. Considering the low cost, simplicity, and gigaton-scale sequestration potential, we believe that DAC based on alkaline industrial residue carbonation can be considered a “low-hanging fruit” in the pursuit of negative emissions to combat climate change.

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“…Therefore, exploring more approaches to dealing with SS is highly required. Flue gas desulfurization is one of the most widely-used technologies to reduce sulfur oxide emissions, and these technologies are commonly classified as wet, semi-dry, or dry processes [8,9]. The powdered solid waste is produced in the DS of desulfurization process in steel plants and power plants.…”

Section: Introductionmentioning

confidence: 99%

Development of Steel Slag-Based Solidification/Stabilization Materials for High Moisture Content Soil

Jia¹,

Hua²,

Qian³

et al. 2022

Journal of Renewable Materials

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To solve the problems of high moisture content, high viscosity, and poor engineering mechanical properties of soil, this paper using with steel slag (SS) and desulfurization ash (DS) as initial raw materials, realizing the cooperative treatment of solid waste and solidification of silt soil. The synergistic utilization of SS and DS can reduce the production cost of curing agent and promote its own consumption. According to blended cement of various SS contents and inspected compressive strength performances, the most suitable raw materials ratio was selected. The best formula for this curing agent is cement:steel slag = 3:7 with 5% DS, and its 28-day compressive strength can reach 30 MPa. The experiment shows that the effect of DS and Na 2 SO 4 reagent with the same quality on early compressive strength improvement of cement and SS system is not much different. In this study, the mineral composition and microstructure of different gel system blocks were characterized by XRD, SEM and EDX, and a large number of webbed structures were found in the SEM test, which was not seen in previous studies. Besides, unconfined compressive strength (UCS), water resistance, and toxic characteristic leaching procedure (TCLP) were used to evaluate silt solidified soil properties. The results demonstrated that the solidified silt could meet not only the standard of general subgrade; but also has a partial stabilization effect of heavy metal ions.

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Selective sulfur removal from semi-dry flue gas desulfurization coal fly ash for concrete and carbon dioxide capture applications

Cited by 28 publications

References 32 publications

Characterization of Macro Mechanical Properties and Microstructures of Cement-Based Composites Prepared from Fly Ash, Gypsum and Steel Slag

Characterization of Macro Mechanical Properties and Microstructures of Cement-Based Composites Prepared from Fly Ash, Gypsum and Steel Slag

Direct Air Capture and Sequestration of CO₂ by Accelerated Indirect Aqueous Mineral Carbonation under Ambient Conditions

Development of Steel Slag-Based Solidification/Stabilization Materials for High Moisture Content Soil

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Selective sulfur removal from semi-dry flue gas desulfurization coal fly ash for concrete and carbon dioxide capture applications

Cited by 28 publications

References 32 publications

Characterization of Macro Mechanical Properties and Microstructures of Cement-Based Composites Prepared from Fly Ash, Gypsum and Steel Slag

Characterization of Macro Mechanical Properties and Microstructures of Cement-Based Composites Prepared from Fly Ash, Gypsum and Steel Slag

Direct Air Capture and Sequestration of CO2 by Accelerated Indirect Aqueous Mineral Carbonation under Ambient Conditions

Development of Steel Slag-Based Solidification/Stabilization Materials for High Moisture Content Soil

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Product

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Direct Air Capture and Sequestration of CO₂ by Accelerated Indirect Aqueous Mineral Carbonation under Ambient Conditions