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Steel slag is a byproduct of the steelmaking and steel refining processes. This paper provides an overview of the different types of steel slag that are generated from basic-oxygen-furnace (BOF) steelmaking, electric-arc-furnace (EAF) steelmaking, and ladle-furnace steel refining processes. The mineralogical and morphological properties of …
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Since the EAF slag is basic slag, the leachate produced from their dissolution generally reach a pH in the range 11–13. This could explain the high concentration of such elements in leachate having a pH in the range 11–11.5 [46]. However, when the pH reaches very high values (above 12), the solubility of V can be drastically reduced (Fig. 3 d).
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1. Introduction. Electric arc furnace (EAF) steelmaking is an eco-friendly process, which recycles end-of-use scrap metal and constitutes approximately 30 pct. of the 1.8 billion tons of steels produced globally [1, 2].Within the EAF steelmaking process, slagmaking is essential in absorbing impurities such as sulfur and phosphorous during …
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Steel slag, which contains basic oxides capable of generating high levels of alkalinity, may be used in leaching beds or leaching channels to neutralize acid mine drainage (AMD). In the present study, electric arc furnace (EAF) slag from the Pasargad Steel Complex was used to investigate the influence of slag particle size on AMD …
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It can be seen that the d 50 of raw slag was determined at 5.5 mm and, for the fragmented slag, was about 0.3 mm. In addition, the d 90 of raw EAF slag is about 7.6 mm and that of the fragmented slag is approximately 3.1 mm. Figure 2. Particle size distribution of raw EAF slag and electro-fragmented EAF slag. 3.3.
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The type of steel furnace slag (SFS), including electric arc furnace (EAF) slag, basic oxygen furnace (BOF) slag, ladle metallurgy furnace (LMF) slag, and argon oxygen decarburization (AOD) slag, can significantly affect the composite properties when used as an aggregate or as a supplementary cementitious material in bound applications, such as …
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When applied with EAF slag for foaming, the porous structure of bio-char contributed to a more constant slag viscosity at 0.30-0.32 Pa‧s, and a decelerated reduction of surface tension, which ...
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The chemical composition of the waste aggregates is summarized in Table 1.Water absorption and density of natural aggregates and slag waste were evaluated according to UNI EN 1097-6 (Table 2).EAF granulated slag showed higher density than natural aggregates as a consequence of their high iron content (20 ÷ 30% vs …
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EAF stainless steel slag (EAF slag) is one kind of chromium-bearing metallurgical solid waste, which belongs to alkaline steel slag, and contains a large number of alkaline mineral phases. The carbonation activity of these minerals gives EAF slag the capability to effectively capture CO2. In this paper, EAF slag samples with different …
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Thermodynamic studies of MgO saturated EAF slag. Foamy slags are widely practiced in electric arc furnace (EAF) steel production, reducing energy consumption, improving yield, reducing furnace noise, and increasing refractory service life. Control of slag chemistry within a specific range is necessary to achieve maximum benefits from …
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Slag foaming can decrease electric power consumption by 3 to 10 pct in EAF operation because foamy slag contributes to post combustion and heat transfer, which …
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On the other hand, angular shaped EAF slag concrete having slag ratio of 0.3 and spherical shaped EAF slag concrete of all slag ratio cases show moderate durability. Low air entrained (∼2%) concretes show bad durability irrespective of the type of slag and the durability factors were calculated in the range of 5–7% only.
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In the present study, electric arc furnace (EAF) slag from the Pasargad Steel Complex was used to investigate the influence of slag particle size on AMD treatment. …
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Information provided on US EPA's website on EAF slag Internet links to the Vanderbilt University website describing the Leaching Environmental Assessment Framework (LEAF) Internet links to trade associations concerned with EAF slag. Date of posting of Closed Session Summary. February 11, 2022. Contact
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Water cooled molten EAF slag The particle size distribution of water-cooled slag are shown in Figure 5. According to the results, the average particle size distribution is between 1mm – 2 mm, while the quantity of fine particles around 0.3 mm in size is approximately 14%. The shape of the granules was investigated by light microscopy and ...
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The slags are about 10–15% in weight of steel production [1,2]. EAF slags are classified as black and white slags. Black slag has a lime content less than 40%, and results from the cold loading of scrap. White slag has a lime content higher than 40% and is generated during grinding when lime is added to remove sulphur and phosphorus.
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During the production of 1-ton liquid crude steel in BOF and EAF, steel slag occurs at a ratio of 12–15% 5,6,7. The steel slag generally contains CaO, MgO, SiO 2, Al 2 O 3, Fe 2 O 3, MnO and ...
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EAF slag forms a particular type of microstructure in the interfacial transition zone. Abstract. Electric arc furnace oxidizing slag (EAFS) is a by-product of the steelmaking industry, generated after the melting and the preliminary acid refining of liquid steel. It is a stony material that is easy to crush for use as aggregate in concrete mixes.
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Sample and preparation. Electric arc furnace (EAF) steelmaking slags that had undergone magnetic separation were obtained from a local steelmaking plant, and the major chemical composition of the ...
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In this work, the generated slag from electric arc furnace (EAF) provided by the French steel industry was characterized by using multitude analytical techniques in order to determine the physico-chemical characteristics of the targeted slag.
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The EAF slag particles distribution has been observed by scanning electron microscopy (SEM) images. The obtained results show good technical feasibility of this …
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The slag is porous and is easy to grind. Under identical loading conditions in a laboratory ball mill, the treated slag takes only half the time to attain a fineness of 400 m 2 kg-1 than that of untreated EAF slag. Microstructure The microstructure of the EAF slag before and after heat treatment is given in Figure 4.
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In practice, there are three major uses for EAF oxidizing slag: 1. EAF slag, in the same way as BOF slag, has traditionally been used as unbound material in preparing subgrades, subbases and bases for beds, embankments of roads and railways (Behiry, 2013, Chesner et al., 1998, Motz and Geiseler, 2001, Rohde et al., 2003, Stroup-Gardiner …
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This paper details the development process of ceramics made out of electric arc furnace (EAF) steel slag, to be used as a shaped homogenous thermal energy storage (TES) media in packed-bed thermocline systems for high-temperatures industrial waste heat recovery, concentrated solar power (CSP), and Carnot batteries applications, …
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The transition to hydrogen-based reduction processes within the iron and steelmaking industry will generate new types of slag compositions that require valorization routes. Using slags as supplementary cementitious materials (SCMs) addresses the carbon dioxide emissions of the cement industry since the SCM requires neither calcination nor …
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The slag chemistry in the EAF is targeted to promote phosphorus removal from the steel and to promote slag foaming to shield the furnace from direct exposure to the arc at high power input. The slag's physical properties (basicity and viscosity) are directly influenced by the slag's chemical composition [3][4].
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Electric arc furnace slag is produced during the manufacture of crude steel by the electric arc furnace (EAF) process. In this process steel scrap with additions of fluxes (e.g., lime[stone] and/or dolomite) are …
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The experimental results of micro EAF/NR composites showed that at 121.78 keV, EAF0 composite (without EAF slag content) had the lowest μ value of 0.1695 cm−1, while the EAF800 composite (which ...
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The MgO saturation concentration depends on the temperature and slag components. The main EAF slag components are CaO, SiO 2, FeO, and MgO; others are Al 2 O 3, MnO, P 2 O 5, and TiO 2.In EAFs that use a large proportion of direct-reduced iron (DRI), several of these oxides, in particular SiO 2 and Al 2 O 3, originate from gangue in …
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Whereas the DRI process itself does not generate any slag, EAF and SAF will do. These slags will be very different. Moreover, the new EAF slags will be also different compared to today's scrap based EAF slag. However, specific slag/metal ratios, resulting slag volumes, chemical and mineralogical compositions and physical properties of the …
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