Effect of FeO on the formation of spinel phases and chromium distribution in the CaO-SiO2-MgO-Al2O3-Cr2O3 system

Li, Jianli; Xu, Anjun; He, Dingyong; Yang, Qingxiang; Nai-yuan, Tian

doi:10.1007/s12613-013-0720-9

Cited by 51 publications

(39 citation statements)

References 14 publications

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“…32,35) The band at 258 cm − 1 observed for this slag could probably be attributed to the bending/deformation modes of the [Cr 3 + O 6 ] units in the structure. In the second series, the spectrum of pure FeCr 2 O 4 shows well-defined peaks at about 1 030, 737, 677, 516, 595, 495, and 250 cm − 1 , 33,36) so the results are consistent with the XRD and SEM/EDS analysis.…”

Section: Discussionsupporting

confidence: 72%

Viscosity Property and Structure Analysis of FeO–SiO2–V2O3–TiO2–Cr2O3 Slags

Huang

Zhao

et al. 2016

ISIJ International

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Section: Discussionsupporting

confidence: 72%

Viscosity Property and Structure Analysis of FeO–SiO2–V2O3–TiO2–Cr2O3 Slags

Huang

Zhao

et al. 2016

ISIJ International

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“…The leaching behaviors of various phases are quite different . It was well accepted that spinel phase is very stable in air and leaching of Cr from spinel phase is negligible . Therefore, modifications of stainless steel slag were proposed by many researchers to enrich Cr in spinel phase and stabilized the slag .…”

Section: Introductionmentioning

confidence: 99%

“…It was well accepted that spinel phase is very stable in air and leaching of Cr from spinel phase is negligible . Therefore, modifications of stainless steel slag were proposed by many researchers to enrich Cr in spinel phase and stabilized the slag . Low basicity was reported to favor the formation of spinel .…”

Section: Introductionmentioning

confidence: 99%

Effects of MnO and CaO/SiO₂Mass Ratio on Phase Formations of CaOAl₂O₃MgOSiO₂CrO_xSlag at 1673 K and PO2=10−10 atm

Shu

Luo

Wang

et al. 2015

steel research int.

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The knowledge on distribution of mineralogical phase in slag is of vital importance to disposal and utilization of slag. Despite of certain amount (up to 5%) of MnO found in stainless steel slag, MnO distribution in phases of slag was not thoroughly investigated. In this work, phases of synthetic CaO–Al2O3–MgO–SiO2–CrOx–MnO slag with varied CaO/SiO2 and MnO content, which was soaked at 1673 K for 12 h, were determined by combining SEM‐EDS and XRD technique. Phases for samples with CaO/SiO2 ratio of 1.5 and 1.3 were composed of Ca2SiO4, merwinite, spinel, and liquid phase, while phases for samples with CaO/SiO2 ratio of 1.1 are composed of spinel and liquid phase. The calculated phases by FactSage were in good agreements with observed ones by SEM‐EDS and XRD. Manganese was found to be enriched in spinel and liquid, and chromium is enriched in spinel, and only negligible Cr could be found in merwinite and Ca2SiO4. The spinel increases in size with increasing of MnO and decreasing of CaO/SiO2 ratio. Disintegration was found in samples with increased MnO content and CaO/SiO2 ratio. The size of Ca2SiO4 crystal increases in size with increase of MnO content and CaO/SiO2 ratio, which could interpret the disintegration of slag. The present investigation indicates that MnO content has important effects on disintegration and spinel precipitation in stainless steel slag.

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“…Crystalline phases, such as spinel, can irreversibly capture heavy metals (eg, CrAl 2 O 4 captures Cr) and may reduce the extent of leaching of these elements . Previous studies have shown that adaptations to the chemistry (eg, addition of FeO or Al 2 O 3 ) and the cooling rate of the slags could promote the formation of spinel phases and thus the immobilization of heavy metals …”

Section: Introductionmentioning

confidence: 99%

Impact of the solidification path of FeO_x–SiO₂ slags on the resultant inorganic polymers

et al. 2019

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Aiming to reduce the carbon dioxide emissions associated with cement production, alternative binders such as inorganic polymers currently receive substantial attention and slags from the non‐ferrous metallurgy are promising precursors. However, studies that correlate their chemistry and crystallinity with the newly formed binder remain limited. In this work, the effect of three different solidification methods on glass formation and reactivity of FeOx–SiO2 slags, as well as on the molecular structure of the resultant Fe‐rich inorganic polymers, was investigated. The inorganic polymers were synthesized by mixing the slags (approximate molar ratio FeO/SiO2 = 1.6) with an alkali silicate solution (molar ratios SiO2/Na2O = 1.6 and H2O/Na2O = 25). Results demonstrated that higher cooling rates promoted higher glass formation and faster reaction kinetics when the slags were activated. 57Fe Mössbauer spectroscopy indicated that all the slags consisted predominantly of Fe2+ ions with a minor amount of Fe3+ ions, regardless of the variability in glass content. The binder phase of all inorganic polymers consisted of iron in both Fe2+ and Fe3+ states, after 28 days of curing. After pulverizing the inorganic polymer pastes and exposing the powder to air for 28 additional days, the Fe2+ state in the binder transformed to Fe3+. The compressive strength evolution of the three slags showed that the 2‐day strength was higher for the samples with a higher amorphous fraction, while after 28 days, this influence was less pronounced.

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Effect of FeO on the formation of spinel phases and chromium distribution in the CaO-SiO2-MgO-Al2O3-Cr2O3 system

Cited by 51 publications

References 14 publications

Viscosity Property and Structure Analysis of FeO–SiO<sub>2</sub>–V<sub>2</sub>O<sub>3</sub>–TiO<sub>2</sub>–Cr<sub>2</sub>O<sub>3</sub> Slags

Viscosity Property and Structure Analysis of FeO–SiO<sub>2</sub>–V<sub>2</sub>O<sub>3</sub>–TiO<sub>2</sub>–Cr<sub>2</sub>O<sub>3</sub> Slags

Effects of MnO and CaO/SiO₂Mass Ratio on Phase Formations of CaOAl₂O₃MgOSiO₂CrO_xSlag at 1673 K and PO2=10−10 atm

Impact of the solidification path of FeO_x–SiO₂ slags on the resultant inorganic polymers

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Effect of FeO on the formation of spinel phases and chromium distribution in the CaO-SiO2-MgO-Al2O3-Cr2O3 system

Cited by 51 publications

References 14 publications

Viscosity Property and Structure Analysis of FeO–SiO<sub>2</sub>–V<sub>2</sub>O<sub>3</sub>–TiO<sub>2</sub>–Cr<sub>2</sub>O<sub>3</sub> Slags

Viscosity Property and Structure Analysis of FeO–SiO<sub>2</sub>–V<sub>2</sub>O<sub>3</sub>–TiO<sub>2</sub>–Cr<sub>2</sub>O<sub>3</sub> Slags

Effects of MnO and CaO/SiO2Mass Ratio on Phase Formations of CaOAl2O3MgOSiO2CrOxSlag at 1673 K and PO2=10−10 atm

Impact of the solidification path of FeOx–SiO2 slags on the resultant inorganic polymers

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Effects of MnO and CaO/SiO₂Mass Ratio on Phase Formations of CaOAl₂O₃MgOSiO₂CrO_xSlag at 1673 K and PO2=10−10 atm

Impact of the solidification path of FeO_x–SiO₂ slags on the resultant inorganic polymers