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steel slag grinding carbonation

Carbonation of Steel Slag for CO2 Sequestration: Leaching of

Effect of steel slag grinding and prior leaching during carbonation experiments on leaching properties, leaching of (carbonated) steel slag relative to reuse criteria, particle size distribution of fresh and carbonated steel slag samples, experimental accuracy, pH stat leaching curves of all analyzed constituents including regulatory and detection limits, modeling curves for Co, Mo,

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Mineral CO2 Sequestration by Steel Slag Carbonation

Ground steel slag was carbonated in aqueous suspensions to study its reaction mechanisms. Process variables, such as particle size, temperature, carbon dioxide pressure, and reaction time, were systematically varied, and their influence on the carbonation rate was investigated.

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Steel Slag - an overview ScienceDirect Topics

The magnetically reseparated steel slag grinds finer than steel slag without magnetic reseparating. Magnetic reseparation of steel slag results in improved grinding with the material exhibiting grindability intermediate between that of steel slag and OPC clinker after the same time of grinding.

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

2019-11-01  The carbonation of steel slag to produce building material is a useful way to increase the utilization of steel slag and absorb carbon dioxide. In this study, gypsum, steel slag, and water were mixed, compaction-shaped, and carbonation-cured as

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Effects of Carbonation on Steel Slag Products Scientific.Net

The effects of carbonation on structure and properties of steel slag specimens are evaluated by some different testing technologys in this paper. The experimental results of strength and soundness show that the compressive strength of samples is improved 6-8 times due to carbonation, and carbonated specimens have qualified autoclave soundness.

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Frontiers Co-treatment of Waste From Steelmaking Processes: Steel Slag

2020-10-16  The iron and steel industry is an energy-intensive sector, and large amounts of waste/ by-products are generated during the steelmaking process, such as CO2, metallurgical slag, and wastewater. Enhancing the development and deployment of treating waste from the steelmaking process will be environment friendly and resource-saving. Capturing CO2 by steel slag

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Pilot production of steel slag masonry blocks

The carbonation set up for the steel slag specimens is shown in Figure 3. The carbonation was carried out for either 2 or 24 hours to examine the effect of reaction time. The chamber is placed on a digital balance to record the mass curve that represents the carbon dioxide uptake during the carbonation reaction. 2.4 Steel slag masonry block

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Aqueous Mineral Carbonation as a Possible CO2 Sequestration

both wollastonite and steel slag. At these process conditions, steel slag shows a slightly higher efficiency than wollastonite due its higher carbonation degree [4,6]. The major energy-consuming process steps are the grinding of the feedstock and the compression of the CO2. -60-40-20 0 20 40 60 80 η CO2 [%] Reaction heat Heating Compression ...

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Carbon Sequestration Via Steel Slag Accelerated Carbonation: The

The untreated and carbonated slag was characterized for elemental composition, carbonate content, mineralogy (XRD and FT-IR analyses) as well as grain size distribution in order to relate the observed carbonation yield with the changes induced by the process on the main physical and chemical properties of the material under concern.

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Susceptibility of Mineral Phases of Steel Slags Towards

To assess if the carbonation conversion limitations could be attributable to differences in the susceptibility towards mineral carbonation of individual alkaline mineral

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Frontiers Accelerated Carbonation of Steel Slag Compacts ...

2015-12-17  Mineral carbonation presents opportunities for the recycling of steel slags and other alkaline residues that are currently landfilled. The Carbstone process was initially developed to transform non-hydraulic steel slags [stainless steel (SS) slag and basic oxygen furnace (BOF) slags] in high-quality construction materials.

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Carbon Sequestration Via Steel Slag Accelerated ...

The untreated and carbonated slag was characterized for elemental composition, carbonate content, mineralogy (XRD and FT-IR analyses) as well as grain size distribution in order to relate the observed carbonation yield with the changes induced by the process on the main physical and chemical properties of the material under concern.

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Carbon Mineralization by Reaction with Steel-Making Waste ...

Calcium and magnesium silicates are generally selected for carbonation due to their abundance in nature. Industrial waste residues emerge as an alternative source of carbonation minerals that have higher reactivity than natural minerals; they are also inexpensive and readily available in proximity to CO 2 emitters.

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Effects of Carbonation on Steel Slag Products Scientific.Net

Also the carbonation reactions of steel slag and the reason that why strength and soundness improved are analyzed by chemical titration, XRD, TG, SEM and MIP etc. Experimental results indicate that in steel slag specimens, f-CaO, f-MgO, partial C2S and C3S minerals could be carbonated, and 105~110 gram CO2 gas could be sequestrated after carbonating per

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Kinetics of steel slag dissolution: from experiments to ...

2019-04-17  Furthermore, the findings from a previous investigation on slag leaching under CO 2 pressure, revealed that the calcium silicates present in steel slag dissolve congruently without leaving a leached layer that can passivate the reactive surface. Also, the effect of stirring rate was found to be negligible on dissolution rate. Together, these results suggest little influence of

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Accelerated carbonation and performance of concrete made ...

Steel slag has been used as supplementary cementitious materials or aggregates in concrete. However, the substitution levels of steel slag for Portland cement or natural aggregates were limited due to its low hydraulic property or latent volume instability.

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THE CO2-BINDING BY Ca-Mg-SILICATES IN DIRECT AQUEOUS ...

Quantitative XRD analysis indicated that Ca2SiO4and Ca3Mg(SiO4)2were the main CO2binding low water-solubility components of PFA as well as steel slags. The main carbonation product was calcite (CaCO3), indicating that Mg-compounds were not in most cases reactive towards CO2at these mild conditions. The CO2uptake for PFA was 29 CO2g/100 g

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Technical Report UDC 669 . 184 . 28 - Nippon Steel Corporation

To expand effective utilization of steelmaking slag, especially for marine applications, in 2002, Nippon Steel Sumitomo Metal Corporation commenced studies to develop a slag reforming process by carbonation as a measure to prevent alkali elution from slag, which caused the white turbidity of seawater.

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Susceptibility of Mineral Phases of Steel Slags Towards ...

To assess if the carbonation conversion limitations could be attributable to differences in the susceptibility towards mineral carbonation of individual

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Mitigation Potential of Mineral Carbonation with ...

Steel slag is an ideal feedstock for mineral carbonation due to its high alkalinity and, more specifically, high Ca content. The typical weight percent ranges of CaO and MgO in SS are 32− 58% and 3.9−10.0%, respectively.15,48Previous investigations suggest that SS is a viable feedstock for cost-effective CO 2

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(PDF) Aqueous Carbonation of Steel Slag: A Kinetics Study

The apparent activation energy of the aqueous carbonation of steel slag was found to be 4.8 kJ/mol. It was confirmed that aqueous carbonation of steel slag is an effective approach for enhancing...

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Accelerated Carbonation of Steel Slags Using CO2 Diluted ...

Baciocchi et al. Steel Slag Carbonation Energy Requirements Frontiers in Energy Research frontiersin.org Solid (L/S) ratio above 2 l/kg, and the resulting slurry is contacted with pressurized CO 2 so that Ca or Mg dissolution and carbonate precipitation take place in the same reactor. It should be noted that the operating conditions that have proven effective to pro-mote the carbonation ...

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Carbon Sequestration Via Steel Slag Accelerated ...

The untreated and carbonated slag was characterized for elemental composition, carbonate content, mineralogy (XRD and FT-IR analyses) as well as grain size distribution in order to relate the observed carbonation yield with the changes induced by the process on the main physical and chemical properties of the material under concern.

More

Mineral CO2 Sequestration by Steel Slag Carbonation

Ground steel slag was carbonated in aqueous suspensions to study its reaction mechanisms. Process variables, such as particle size, temperature, carbon dioxide pressure, and reaction time, were systematically varied, and their influence on the carbonation rate was investigated.

More

Effects of Carbonation on Steel Slag Products Scientific.Net

Also the carbonation reactions of steel slag and the reason that why strength and soundness improved are analyzed by chemical titration, XRD, TG, SEM and MIP etc. Experimental results indicate that in steel slag specimens, f-CaO, f-MgO, partial C2S and C3S minerals could be carbonated, and 105~110 gram CO2 gas could be sequestrated after carbonating per kilogram of steel slag specimens.

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Kinetics of steel slag dissolution: from experiments to ...

2019-04-17  Abstract Carbon dioxide sequestration via carbonation of steel slags is a promising way of combining two waste products to create value. Understanding the dissolution kinetics of steel slags, which are alkaline and rich in calcium, in acidic media is essential to configure such a process.

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Direct Gas–Solid Carbonation Kinetics of Steel Slag and ...

Temperature, CO 2 concentration, and the presence of SO 2 impacted on the carbonation conversion of steel slag through their direct and definite influence on the rate constants. Temperature was the most important factor influencing the direct gas–solid carbonation of steel slag in terms of both the carbonation conversion and reaction rate.

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Technical Report UDC 669 . 184 . 28 - Nippon Steel Corporation

To expand effective utilization of steelmaking slag, especially for marine applications, in 2002, Nippon Steel Sumitomo Metal Corporation commenced studies to develop a slag reforming process by carbonation as a measure to prevent alkali elution from slag, which caused the

More

Accelerated carbonation and performance of concrete made ...

Mo, L and Zhang, F and Deng, M and Jin, F and Al-Tabbaa, A and Wang, A (2017) Accelerated carbonation and performance of concrete made with steel slag as binding materials and aggregates. Cement and Concrete Composites, 83. pp. 138-145. ISSN 0958-9465. Full text not available from this repository. Abstract. Steel slag has been used as supplementary cementitious materials or

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(PDF) The CO 2 -binding by Ca-Mg-silicates in direct ...

Conclusions Direct aqueous carbonation of Ca and Mg silicates which were derived from the actual industrial wastes like PF oil shale ash and steel slags (EAFS types 1 and 2 and ladle slag) was demonstrated. The experiments were carried out at mild operating conditions: room temperature and atmospheric pressure. Comprehensive mineral composition of the initial samples as well as the carbonation ...

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Accelerated Carbonation of Steel Slags Using CO2 Diluted ...

Baciocchi et al. Steel Slag Carbonation Energy Requirements Frontiers in Energy Research frontiersin.org Solid (L/S) ratio above 2 l/kg, and the resulting slurry is contacted with pressurized CO 2 so that Ca or Mg dissolution and carbonate precipitation take place in the same reactor. It should be noted that the operating conditions that have proven effective to pro-mote the carbonation ...

More

Accelerated Carbonation of Steel Slag Compacts ...

Keywords: accelerated carbonation, steel slag recycling, sustainable building materials, cO. 2. sequestration, carbonation technology. inTrODUcTiOn. An estimated 170–250 Mt of steel slags were generated worldwide in 2014 (U.S. Geological Survey, 2015). The recycling of these slags provides a number of environmental benefits, including the preservation of natural resources, the recovery of ...

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(PDF) Aqueous Carbonation of Steel Slag: A Kinetics Study

With regard to the type of steel slag, EAF steel slag is better than BOF steel slag in reactivity and Ca use. All of the results indicate that the carbonation reaction of steel slag is controlled ...

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Kinetics of steel slag dissolution: from experiments to ...

2019-04-17  Furthermore, the findings from a previous investigation on slag leaching under CO 2 pressure, revealed that the calcium silicates present in steel slag dissolve congruently without leaving a leached layer that can passivate the reactive surface. Also, the effect of stirring rate was found to be negligible on dissolution rate. Together, these results suggest little influence of external mass ...

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Performance of steel slag in carbonation-calcination ...

The existence of portlandite in the steel slag provided a maximum theoretical CO2 capture capacity of 112.7 mgCO2 g slag-1, and the maximum carbonation conversion of 39.8{\%} was achieved in simulated flue gases with only 5 min duration of carbonation. Sintering of the steel slag particles during both the carbonation and calcination processes, especially the destruction of the 3 nm pores, is ...

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Direct gas-solid carbonation kinetics of steel slag and ...

Direct gas-solid carbonation of steel slag showed a rapid CO2 sequestration rate, high CO2 sequestration amounts, low raw-material costs, and a large potential for waste heat utilization, which is promising for insitu carbon capture and sequestration in the steel industry. AB - Direct gas-solid carbonation of steel slag under various operational conditions was investigated to determine the ...

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CO₂ sequestration by mineral carbonation of steel slags ...

This work focuses on the influence of different parameters on the efficiency of steel slag carbonation in slurry phase under ambient temperature. In the first part, a response surface methodology was used to identify the effect and the interactions of the gas pressure, liquid/solid (L/S) ratio, gas/liquid ratio (G/L), and reaction time on the CO₂ removed/sample and to optimize the parameters.

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Direct mineral carbonation of steelmaking slag for CO 2 ...

2015-12-18  Huijgen WJJ, Witkamp GJ, Comans RNJ (2005) Mineral CO 2 sequestration by steel slag carbonation. Environ Sci Technol 39:9676–9682. CAS Article Google Scholar Huijgen WJJ, Ruijg GJ, Comans RNJ, Witkamp GJ (2006) Energy consumption and net CO 2 sequestration of aqueous mineral carbonation. Ind Eng Chem Res 45:9184–9194 . CAS Article Google Scholar Indian Network for

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(PDF) The CO 2 -binding by Ca-Mg-silicates in direct ...

Conclusions Direct aqueous carbonation of Ca and Mg silicates which were derived from the actual industrial wastes like PF oil shale ash and steel slags (EAFS types 1 and 2 and ladle slag) was demonstrated. The experiments were carried out at mild operating conditions: room temperature and atmospheric pressure. Comprehensive mineral composition of the initial samples as well as the carbonation ...

More

Accelerated carbonation and performance of concrete made ...

In this study, 60% of steel slag powders containing high free-CaO content, 20% of Portland cement and up to 20% of reactive magnesia and lime were mixed to prepare the binding blends. The binding blends were then used to cast concrete, in which up to 100% of natural aggregates (limestone and river sands) were replaced with steel slag aggregates. The concrete was exposed to carbonation curing ...

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