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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 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.
However, steel-reinforced concrete is often used in severe environments where sea water or deicing salts are present. When chloride moves into the concrete, it disrupts the passive layer protecting the steel, causing it to rust and pit. Carbonation of concrete is another cause of steel .
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.
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 ...
Slag of various origins will be treated in this plant, located along the Sambre River in the Farciennes - Walloon Municipality (near Aperam Carinox). The functional objective of the plant is to use carbonation to manufacture high value construction products from two residual products, namely steel slag and CO2.
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
Feb 23, 2006· Grinding the fresh steel slag does not form a barrier for the re-use of steel slag from an environmental quality point of view. Of the elements that show increased leaching after grinding, Cr, Mn and Pb do not show altered leaching at either the native pH of the fresh steel slag or pH-values that can potentially be reached after
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.
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 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
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.
Oct 20, 2010· This paper examines the main results of an accelerated carbonation treatment applied to different types and size fractions of stainless steel slag. The objectives of this work were essentially to assess the CO2 uptake achievable by each type of slag under mild operating conditions and to investigate the effects of carbonation on the mineralogy and leaching behaviour of the residues.
Apr 04, 2012· D. Sichen, in Fundamentals of Metallurgy, 2005. 9.5.1 Slag–metal mixing. In steelmaking, slag–metal mixing is a very common phenomenon and it occurs due to the shear at the slag–metal interface caused by excessive liquid steel flow. 37 This mixing leads to emulsification of steel in slag, which increases the total interfacial area and consequently the rate of slag–metal reactions.
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.
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 ...
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.
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).
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 ...
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 = .
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 = .
where D CO2 (m 2 /s) is the diffusivity of CO 2 species which is a function of temperature 17, δ is the film thickness (m), and k CO2 is the mass transfer coefficient (m/s). According to our ...
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.
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
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