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h/yr). For steel slag, a significantly smaller carbonation process was designed in view of the relatively limited avail-ability of steel slag; 15,000 kg/h or 120 kton/yr CO 2, con-sistent with the approximate amount of CO 2 that can potentially be sequestered in the steel slag produced in The Netherlands [16]. Simulations of both the wollastonite
ment of the carbonation reaction, which is typically very slow at natural conditions.2,3 In previous papers, we have studied the aqueous carbonation of two Ca-silicates, wollastonite4 and steel slag,7,10 and shown that the carbonation rate could be increased significantly by, e.g., grinding the feedstock and elevating the
The CO 2 -binding by Ca-Mg-silicates in direct aqueous carbonation of oil shale ash and steel slag Article (PDF Available) in Energy Procedia 4:925-932 · December 2011 with 136 Reads
In this study, the kinetics of aqueous carbonation of steel slag in an atmospheric three-phase system containing steel slag, water, and CO 2 gas was studied. Also, some factors likely affecting this process were investigated, such as reaction time and temperature, steel slag particle size (d 0.5), CO 2 flow rate, and the mass ratio of liquid to solid (L/S).
Figure 1 shows the steel slag in slag yard at the plant. The chemical compositions of steel slag obtained by the X-ray fluorescence (XRF) spectrometry are shown in Table 1. The main oxides are calcium oxide, iron oxide and silica oxide. 2.2 Steel slag grinding Steel slag needs to be fine enough in order to be able to react with carbon dioxide.
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 ...
The mineral carbonation uptake is a function of process temperature, CO 2 partial pressure, and steel waste surface area, which affect the carbon dioxide dissolution rate, the diffusion rate of ions through the reaction with steel slag. The pH value is an additional essential parameter in mineral carbonation process.
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.
May 20, 2020· 1. Introduction. Argon oxygen decarburization (AOD) slag, which is generated during the stainless-steel refining process, is a by-product of the steel industry (Li et al., 2017a).AOD slag is a kind of alkaline material characterized by a dominance of Ca-bearing silicate phases, and the minerals include γ-dicalcium silicate, fluorite and magnetite, as well as traces of f-CaO, f-MgO and calcite ...
Apr 12, 2013· Fig 3 Steelmaking slag. Aging treatment. Since the flux added to refine the steel forms a component of the steelmaking slag. It is particular significance that CaO and MgO contained in the flux remain partly inactive and reside in the slag or crystallize while the slag is solidified and cooled.
Steel slag (SS) was used to replace natural aggregate (NA) in pervious concretes (PCs) and important properties of the concretes were investigated in this work. The replacement levels of .
Steel slag (SS) was used to replace natural aggregate (NA) in pervious concretes (PCs) and important properties of the concretes were investigated in this work. The replacement levels of SS were ...
Slags from steel manufacturing have been proven to be suitable for CO 2 sequestration due to their remarkable reactivity related to the typical alkaline nature. In previous work, the research group demonstrated that maximum values of 280-400 g CO 2 /kg slag (depending on the slag type) could be attained in slurry phase (L/S = 5 l/kg) at p = 10 bar and T = 100 °C.
Beneficial use of stainless steel slag rev 42011 page 5 of 8 there is a significant change in the process generating the stainless steel slag or residual aggregate b each time a new source of stainless steel slag or residual aggregate is received c quarterly for stainless steel slag or residual aggregate which has previously . Details
Steel slag replacement increases the connected porosity and the water permeability. • Pervious concretes with steel slag aggregate exhibit better mechanical strengths. • Incorporating steel slag improves the carbonation resistance and abrasion resistance. • Microstructural studies show that cement hydrates link tightly with steel slag.
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. The maximum carbonation degree
The Association and our members Blupe Steel and Molycop Australia are participating in the development of the project by providing samples of crushed steel slag to be tested. The project will provide a preliminary assessment of the technical and economic feasibility of applying mineral carbonation technology on selected steel slags.
Nov 15, 2005· Properties of a Carbonated Steel Slag-Slaked Lime Mixture. Journal of Materials in Civil Engineering 2015, 27 (1), 04014115. DOI: 10.1061/(ASCE)MT.1943-5533.0001049. Eleanor J. Berryman, Anthony E. Williams-Jones, Artashes A. Migdisov. Steel slag carbonation in a flow-through reactor system: The role of fluid-flux.
Jan 18, 2016· This work presents the results of carbonation experiments performed on Basic Oxygen Furnace (BOF) steel slag samples employing gas mixtures containing 40 and 10% CO2 vol. simulating the gaseous effluents of gasification and combustion processes respectively, as well as CO2 for comparison purposes. Two routes were tested, the slurry-phase (L/S = 5 l/kg, T = 100°C and Ptot = .
Dec 17, 2015· Mineral carbonation involves the capture and storage of carbon dioxide in carbonate minerals. 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 ...
Mar 22, 2006· 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, and Zn.
The CO2 uptakes for steel slags were 8.7g CO2/100 g EAFS1, 1.9 g CO2/100 g EAFS2 and 4.6 g/100g LS. CO2-binding ability of different wastes depends significantly on the origin of the material as well as on the pretreatment conditions. Based on multifaceted studies about carbonation of oil shale ash, a new method for eliminating
Jan 01, 2018· Carbonation of Ca/Mg-containing industrial alkaline residues is a novel way for CO 2 sequestration, which attracts increasing attention in the context of cutting down CO 2 emissions. Steel slag, a typical industrial byproduct produced during the steel making process, usually contains abundant CaO and exhibits high carbonation reactivity and hence great capacity of CO 2 adsorption.
If the energy consumed in steel slag grinding/magnetic separating is more than that for calcining and grinding of raw materials and clinker, BOS slag will lose its economic significance as an additive of blended cement. Although several papers have been published dealing with steel slag use in blended cement, few have addressed the grinding ...
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