Iron redox equilibria in BOF slag equilibrated with ambient air

Park, Jong Min

doi:10.1002/srin.200200171

Cited by 8 publications

(4 citation statements)

References 3 publications

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“…In this environment, the abundance of ferric iron would be more plausible. Park et al [31] postulated, at the beginning of the solidification directly after tapping, the Fe 2+ /Fe 3+ is determined by the initial Fe content of the slag as well as by its basicity. Considering these results with respect to high basicities (as they occur in the BOF slag of this study), at the beginning of the crystallization, when basicity is highest, only a very small proportion of Fe 2+ but still plausible is present in the melt with the equilibrium clearly on the Fe 3+ side.…”

Section: Ferrous Iron Next To Pentavalent Vanadiummentioning

confidence: 99%

Investigation on Vanadium Chemistry in Basic-Oxygen-Furnace (BOF) Slags—A First Approach

Wunderlich

Schirmer²,

Fittschen

2021

Metals

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Basic oxygen furnace (BOF) slag accounts for the majority of all residual materials produced during steelmaking and may typically contain certain transition metals. Vanadium, in particular, came into focus in recent years because of its potential environmental toxicity as well as its economic value. This study addresses the vanadium chemistry in BOF slags to better understand its recovery and save handling of the waste stream. The experimental results from the electron probe microanalysis (EPMA) study show that vanadium is preferably incorporated in calcium orthosilicate-like compounds (COS), with two variations occurring, a low vanadium COS (COS-Si) (approx. 1 wt.%), and a high vanadium COS (COS-V) (up to 18 wt.%). Additionally, vanadium is incorporated in dicalcium ferrite-like compounds (DFS) with an average amount of 3 wt.%. Using powder x-ray diffraction analysis (PXRD), EPMA, and virtual component models, stoichiometric formulas of the main vanadium-bearing phases were postulated. The stoichiometries give an estimate of the oxidation states of vanadium in the respective hosts. According to these results, trivalent vanadium is incorporated on the Fe-position in dicalcium ferrite solid solution (DFS), and V4+ and V5+ are incorporated on the Si-position of the COS.

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Section: Ferrous Iron Next To Pentavalent Vanadiummentioning

confidence: 99%

Investigation on Vanadium Chemistry in Basic-Oxygen-Furnace (BOF) Slags—A First Approach

Wunderlich

Schirmer²,

Fittschen

2021

Metals

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“…Mg 2+ , and Fe 2+ ). The increase in the amount of Al 3+ resulting from the deficiency of cations promotes the reverse reaction 13,19 of redox equilibria [20][21][22] represented in Equations (5) and (6).…”

Section: −mentioning

confidence: 99%

“…Yang and Belton 19 reported that in slags with high‐Al 2 O 3 contents, the 6‐coordinated Fe 3+ satisfies electrical neutrality and forms a ferric tetrahedral structure (FeO 4 5− ) by the charge compensation of cations (Ca 2+ , Mg 2+ , and Fe 2+ ). The increase in the amount of Al 3+ resulting from the deficiency of cations promotes the reverse reaction 13,19 of redox equilibria 20‐22 represented in Equations () and ().

{Al}^{(][, 4)} ‐ {()(, Mg, Ca)}_{0.5} = {()(, Mg, Ca)}_{0.5} ‐ NBO + {Al}_{XS},

{Fe}^{3 +} + {AlO}_{4}^{5 ‐} = {FeO}_{4}^{5 ‐} + {Al}^{3 +} ({Al}_{2} {normalO}_{3} ‐ bearing slags),

{Fe}^{3 +} + 4 {normalO}^{2 ‐} = {FeO}_{4}^{5 ‐} (redox equilibria) .

…”

Section: Introductionmentioning

confidence: 99%

Structure–property relationship amphoteric oxide systems via phase stability and ionic structural analysis

2020

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Understanding the correlation between material deterioration and quality is required to control the slag composition with increasing gangue components (Al 2 O 3 /SiO 2) 1-3 and impurity elements (S and P). According to recent studies, 1,3,4 the flexibility of slag usage can be secured using the structure-property relationships of slag containing moderate CaO contents and amphoteric oxides such as Fe t O and Al 2 O 3. Detailed observations of the ionic structure of slags aid the fundamental understanding of the physical and chemical properties of slags. Understanding the structure-property relationship enables the prediction of properties via the slag-property model with strong reliability. 1,3,4 Mysen and Richet 5 reviewed the relationship between the ionic structure and the properties of silicate for geological magma or glass, and Keene and Mills 6 summarized the physical properties of BOS slags. Recently, the relationships between various physical properties of slag, such as the viscosity, heat capacity, conductivity, surface tension, and foaming index, with the ionic structure of slags have been reviewed. 1

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“…The element Fe existed in slag in the form of calcium ferrite, wustite solid solution and hematite.The reactions mainly involved in oxidized process were shown in Equ. 1-4 .The solid phase of MgO-FeO after oxided was proposed to be formed magnesiowustite [9].…”

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confidence: 99%

Identification of Fe-Containing Phase in Oxidation Process of BOF Slag

Chen

Jiang

Yang

et al. 2017

KEM

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In this paper, the Fe-containing phases in BOF slag were identified before and after oxidized with atmospheric air. XRD and SEM with EDS results showed that The element Fe existed in slag in the form of calcium ferrite, wustite solid solution and hematite. Mg solid solute in wustite. After oxidized, magnetite became the major mineral phase in slag and Mg + replace the Fe2+ of magnetite crystal to form spinel.

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Iron redox equilibria in BOF slag equilibrated with ambient air

Cited by 8 publications

References 3 publications

Investigation on Vanadium Chemistry in Basic-Oxygen-Furnace (BOF) Slags—A First Approach

Investigation on Vanadium Chemistry in Basic-Oxygen-Furnace (BOF) Slags—A First Approach

Structure–property relationship amphoteric oxide systems via phase stability and ionic structural analysis

Identification of Fe-Containing Phase in Oxidation Process of BOF Slag

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