Method for measuring content of free magnesium oxide in …

2014-9-23 · The invention relates to a method for measuring content of free magnesium oxide in steel slag The method comprises the following steps: firstly, grinding steel slag to be measured into steel slag powder, putting the steel slag powder into a pressure container for pressure evaporation so as to sufficiently hydrate magnesium oxide in the steel slag powder for completely converting into …

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Non-Metallic Inclusions in Steels

2021-12-11 · TiS and Ti-rich inclusions in austenitic stainless steel. Titanium oxide inclusions act as nucleus sites for ferrite and create an acicular ferrite structure in steel. Titanium oxide with Al, and MnS in steel with 0.090% C-0.89% Mn. Traces of slag on the fracture surface in AISI D2 steel.

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Detoxification and Comprehensive Recovery of Stainless …

2022-6-18 · The fitting spectra of Moss spectrum analysis of stainless steel dust and chromium containing slag are shown in Fig. 2(a) and (b), respectively. The Moss spectra were fitted with appropriate combinations of lorentzian profiles representing singlet, doublet and sextet components, and spectral parameters of these components IS (Isomer Shift), QS (Quadrupole Splitting), LW (Line Width ...

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Determination of Free Magnesium Oxide in Steelmaking …

A steelmaking slag is one of the main by-products of iron and steel. The slag has been reused as aggregate for road and civil constructions. However, the slags may contain free magnesia (f-MgO) that can cause expansive self-destruction by reactions with water and carbon dioxide in the air.

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Determination of free calcium oxide in steel slag by …

2022-2-25 · Technology Center,Wuhan Iron and Steel Group Kunming Iron and Steel Limited by Share Ltd,Kunming 650302,China: Abstract; Figure/Table; References (0) ... Determination of free calcium oxide in steel slag by thermogravimetry[J]. PHYSICS EXAMINATION AND …

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MINIMIZATION OF THE CALCIUM OXIDE CONTENT IN …

2011-5-31 · Keywords: steel slag, volumetric instability, CaOfree melt 1. Introduction The steel slag used for road construction comes from EAF/converter steel-making, and, in the same time, from the secondary steel-making, i.e. LF slag. In principal, the steel is made and refined under a strongly basic slag. This slag contains significant quantities of ...

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Chemical characteristics of iron and steel slag : NIPPON …

2020-10-18 · The primary components of iron and steel slag are limestone (CaO) and silica (SiO 2).Other components of blast furnace slag include alumina (Alsub>2 O 3) and magnesium oxide (MgO), as well as a small amount of sulfur (S), while steelmaking slag contains iron oxide (FeO) and magnesium oxide (MgO) the case of steelmaking slag, the slag contains metal elements (such as iron) in oxide …

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Activity of Iron Oxide in Steelmaking Slag | SpringerLink

2008-5-16 · S everal workers have attempted to measure the free energy of formation of ferrous oxide and its activity in molten slag.[1–24] Equilibration of liquid iron and molten slag with H 2 /H 2 O or CO/CO 2 gas mixtures was the most common technique employed by these workers.[1–6,10,12–15] A summary of the investigations reported by the different authors is listed in Table I.

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Effect of Different CO2 Treatments on the Metal Leaching …

2021-11-17 · Carbonation is an effective method to promote the quality of the steel slag binder. In this article, two carbonation approaches, namely hot-stage carbonation and accelerated carbonation, were employed to leach the metals, and the influence mechanism on the metal sequential leachability of the binders composed of 80 wt% of EAF slag incorporating 20 wt% of Portland cement (PC) was revealed.

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Steel Slag

where F s is the free CaO content in steel slag (by w/w%); C o is the content of OPC clinker ... 7CaO · P 2 O 3 · 2SiO 2, and some other oxides exist in steel slag (Sersale, Amicarelli, Frigione et al., 1986; Shi, 2004). It was reported that the X-ray diffraction pattern of …

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[PDF] Effects of surface Fe(III) oxides in a steel slag on the ...

@article{Nishimoto2013EffectsOS, title={Effects of surface Fe(III) oxides in a steel slag on the formation of humic-like dark-colored polymers by the polycondensation of humic precursors}, author={Ryo Nishimoto and Shigeki Fukuchi and Guangxia Qi and Masami Fukushima and Tsutomu Sato}, journal={Colloids and Surfaces A: Physicochemical and ...

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Strength Properties of Steel Slag in Concrete

2022-3-8 · Steel slag, a by-product obtained from steel formation during the separation of the molten steel from impurities in furnaces. A molten liquid melt obtained from slag is a complex silicates and oxides that solidify on cooling. A partial replacement of steel stag is referred in this study in terms of fine aggregate material. This study is carried ...

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Control of Hydration of Free Magnesia in Steelmaking Slag

2021-8-9 · Abstract The expansion phenomenon, which is a major issue when using steelmaking slag as a roadbed material and civil engineering material, is caused by the volume expansion during hydration of free CaO (undissolved CaO and precipitated CaO) and free MgO (undissolved MgO and precipitated MgO) contained in steelmaking slag. From the weight change of MgO reagent hydrated in distilled …

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(PDF) Activity of Iron Oxide in Steelmaking Slag

This Paper. A short summary of this paper. 37 Full PDFs related to this paper. Read Paper. Activity of ferric oxide in steelmaking slag Somnath Basu Research & Development, Tata Steel, Jamshedpur 831 001, India Tel: +91 657 2147500 Fax: +91 657 2271748 E-mail: [email protected] Ashok Kumar Lahiri Formerly with Indian Institute of ...

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Publication year rev: 7978-2022 / Publication Year: 2022 / …

A locked padlock) or https:// means you''ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

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Geotechnical and Environmental Impacts of Steel Slag …

2014-12-4 · Steel slag is mainly composed of environmentally benign oxides like calcium, silicon and iron, but it may also contain low concentrations of potentially toxic elements, including chromium, nickel and vanadium. Additionally, the high pH levels of leachate from steel slag (pH>12) exceeds a maximum pH of 8.5 in water discharges as allowed by the

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Steel-slag: a supplementary cementious material and basis …

2011-7-1 · Steel-slag with alkalinity greater than 1.8 is usually recommended. 2. Steel-slag can be used to produce energy-saving cement by co-grinding with OPC clinker and blastfurnace slag. In such preparations OPC clinker is about 15-30%, steel-slag around 30 …

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Chemical, Mineralogical, and Morphological …

2011-10-26 · 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) …

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Influence of desulfurization slag containing oxides of …

2021-11-8 · The semi-steel desulfurization slag containing oxides of vanadium and titanium differs greatly from the common desulfurization slag. And the current studies on the performance of the semi-steel desulfurization slag are still relatively few. ... ΔG ° 9 is the standard Gibbs free energy change of Reaction ; R is the perfect gas constant, 8.314 ...

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Utilization of BOF steel slag aggregate in metakaolin …

2021-9-20 · These free oxides have a low activity and the hydration occurs after many years, and so the soundness of steel slag refers to its ability to retain its volume after the matrix gets hardened. A larger expansive internal stress could be incurred by the hydration of f -CaO and f -MgO, thus affecting the volume stability in concrete structure [16 ...

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The Comprehensive Utilization of Steel Slag in …

2018-12-31 · The use of metallurgical solid wastes such as steel slag, in agricultural activity, has become very important to contribute to reducing the accumulation of such wastes in the environment and to increase crop production. So, this chapter aims to …

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Determination of the content of free calcium oxide in steel …

2022-3-4 · Abstract: The glycol-TG method has been investigated as a means of determining the content of free CaO in steel slag. Glycol was used to measure the content of pure CaO, pure MgO and pure Ca(OH) 2 . TG-DTA analysis was used to analyze steel slag, with a specific surface area of 500m 2 /kg, after different hydration times. Samples of steel slag containing different quantities of Ca(OH) 2

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Advances in Understanding the Alkali-Activated …

2021-5-25 · This paper summarized and reviewed the mechanism and macro-performance of alkali-activated metallurgical slag, including steel slag, copper slag, ferronickel slag, and lead-zinc slag. Better activated method and alkali-activator are still needed to be developed to improve the performance of the metallurgical slag with low reactivity. Besides, the chemical components’ variation of these ...

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The soundness of steel slag with different free CaO and …

2017-10-1 · The presence of free CaO and free MgO in the presence of water and the oxidation of the metallic iron fraction raise concerns about the use of steel …

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how steel manufacture slag malaysia

Steel Slag Material Description User Guidelines for Waste and . ORIGIN Steel slag a byproduct of steel making is produced during the separation of the molten steel from impurities in steelmaking furnaces The slag occurs as a molten liquid melt and is a complex solution of silies and oxides that solidifies upon cooling Virtually all steel is now made in integrated steel plants using a ORIGIN ...

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(PDF) Utilization of BOF steel slag aggregate in metakaolin …

2021-6-16 · demonstrated to be superior to NaOH because free oxides in steel slag could be . 21. consumed in residual silicate. This research could facilitate the recycling and upgrading . 22.

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Sequestration of carbon dioxide in steel slag

2020-9-11 · used during production of steel. The slag is separated from the liquid metal at the end of the metallurgical treatments due to its low density. During the primary stage of steel production, the steel slag produced is referred to as furnace slag. This is the major source of steel slag. The molten steel is then transferred in a ladle for

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Determination of Free Calcium Oxide in Steel Slag by …

Determination of Free Calcium Oxide in Steel Slag by Inductively Coupled Plasma Atomic Emission Spectrometry after Leaching with Strontium Nitrate-Ethylene Glycol: WU Jing 1,2, LIU Aikun 1,2, YANG Julei 1,2: 1. State Key Laboratory of Advanced Stainless Steel Materials, Taiyuan Iron&Steel(Group) Co., Ltd., Taiyuan 030003, China; 2. Technology ...

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Determination of free calcium oxide in steel slag by EDTA ...

Article "Determination of free calcium oxide in steel slag by EDTA complexometric titration" Detailed information of the J-GLOBAL is a service based on the concept of Linking, Expanding, and Sparking, linking science and technology information which hitherto stood ...

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The soundness of steel slag with different free CaO and …

2017-10-1 · 3.5. Autoclave test of concrete. The results above show that steel slag B presents bad soundness, while steel slags A, C, D and E present qualified soundness. Table 1 shows that the free CaO (4.96%) content of steel slag B is the highest among the five …

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Assessment of Electric Arc Furnace (EAF) Steel …

Steel slag is one of the most common waste products from the steelmaking industry. Conventional methods of slag disposal can cause negative impacts on humans and the environment. In this paper, the process of steel and steel slag production, physical …

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Procedures to determine free calcium oxide content in …

Procedures to determine free calcium oxide content in steel slag The Utilization of Slag in Civil Infrastructure Construction . 10.1016/b978-0-08-100381-7.09902-x . 2016 . pp. 395-399. Keyword(s): Calcium Oxide . Steel Slag . Free Calcium . Oxide Content

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STEEL SLAG: APPLICATIONS FOR AMD CONTROL

2001-4-2 · 41 ug/l vs. DW standard 10 ug/l (Table 3). The same slag was subjected to a TCLP test according to EPA procedures. All leachate parameters were below the maximum allowable limits (Table 4). Given the amount of alkalinity in steel slag, it is expected that few metals would be mobilized unless the leaching medium becomes acid.

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Determination of the content of free calcium oxide in steel ...

Abstract: The glycol-TG method has been investigated as a means of determining the content of free CaO in steel slag.Glycol was used to measure the content of pure CaO, pure MgO and pure Ca(OH)2.TG-DTA analysis was used to analyze steel slag,with a specific surface area of 500m2/kg,after different hydration times.Samples of steel slag containing different quantities of …

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Development of Analytical Methods for Free-MgO in …

2019-4-3 · MgO) as well as free calcium oxide in the slag are potential causes of this expansion, analytical methods to determine the free-MgO in slag for accurate evaluation of expansion are required. Based on a combination of chemical extraction and thermogravimetry (TG), an accurate method to determine the free-MgO in steelmak-ing slag was developed ...

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Use of Steel Slag in Concrete as Fine Aggregate

2020-5-7 · predominant compounds in steel slag are dicalcium silicate, tricalcium silicate, dicalcium ferrite, merwinite, calcium aluminate, calcium-magnesium iron oxides, some free lime and magnesia. Steel slag is mildly alkaline, with a solution pH generally in range of 8 to 10. PHYSICAL PROPERTIES

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