Experimental Study on the Formation of V-Rich Spinel Phase in CaO-SiO2-MgO-FeOt-Al2O3-V2O3-P2O5 Slags at 1573 K (1300 °C)

Wu, Liushun; Qi, Cunjun; Yan, Baijun; Wang, Jue; Dong, Yuan

doi:10.1007/s11663-018-1486-2

Cited by 10 publications

(12 citation statements)

References 19 publications

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“…They found that, when the wüstite phase appeared in the slag, most of V 2 O 3 was concentrated in the spinel phase. [ 6 ] Their results are in accordance with the present findings.…”

Section: Discussionsupporting

confidence: 93%

“…The presence of the spinel phase at 1573 K in a similar system has also been reported by Wu and his co‐workers. [ 6 ]…”

Section: Discussionmentioning

confidence: 99%

“…To the best of authors’ knowledge, no literature data have been published, though some recent work has reported the slag structure relevant to vanadium extraction. [ 6–12 ] In these studies, vanadium is found in high concentration in spinel phase and CaVO 3 depending on the investigated slag composition. [ 6–11 ] Al, Cr, Mg, Mn, Fe, and Ti are found together with V in the spinel phase.…”

Section: Introductionmentioning

confidence: 99%

“…[ 6–12 ] In these studies, vanadium is found in high concentration in spinel phase and CaVO 3 depending on the investigated slag composition. [ 6–11 ] Al, Cr, Mg, Mn, Fe, and Ti are found together with V in the spinel phase. [ 6,7,9,10 ]…”

Section: Introductionmentioning

confidence: 99%

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Effect of Reduction Degree on Characteristics of Slag Formed by Melting Hydrogen‐Reduced DRI and Partitions of P and V between Slag and Metal

Vickerfält

Martinsson

Sichen

2020

steel research int.

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Self‐fluxing hematite pellets are reduced by hydrogen to different degrees. The reduced pellets are melted in closed MgO crucibles at 1873 K to study the effect of reduction degree on the characteristics of slag formed. The results reveal that the phosphorus content in the metallic phase can be brought down to 130 ppm merely by the self‐fluxing slag, even though the slag weighs only about 8% of the metal. It shows a great potential in reducing the amount of slag formers in the steelmaking process. The slag compositions obtained by melting the reduced pellets are used to prepare small synthetic slag samples for identifying the phases after melting. The use of the small samples is to ensure efficient quenching. Microscopic examination reveals that all the self‐fluxing slags contain mainly three phases, namely, magnesiowüstite, spinel, and a liquid phase. Most of vanadium is found to be in the spinel and magnesiowüstite phases. The liquid phase only contains 1–2 wt% V2O3. Decreased FeO content of the slag increases the vanadium oxide contents in the spinel and magnesiowüstite phases. The fact that vanadium concentrates in the solid oxide phases provides essential information for sustainable extraction of vanadium from the steelmaking slag.

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“…They found that, when the wüstite phase appeared in the slag, most of V 2 O 3 was concentrated in the spinel phase. [ 6 ] Their results are in accordance with the present findings.…”

Section: Discussionsupporting

confidence: 93%

“…The presence of the spinel phase at 1573 K in a similar system has also been reported by Wu and his co‐workers. [ 6 ]…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Reduction Degree on Characteristics of Slag Formed by Melting Hydrogen‐Reduced DRI and Partitions of P and V between Slag and Metal

Vickerfält

Martinsson

Sichen

2020

steel research int.

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“…[22][23][24][25] Formation of V-rich spinel phase in CaO-SiO 2 -MgO-FeO t -Al 2 O 3 -V 2 O 3 -P 2 O 5 slags at 1 573 K has been discussed to separate the vanadium-concentrating phase. 26) Meanwhile, many researchers have reported that the suitable of crystallization temperatures of spinels in vanadium-containing slags was 1 373-1 573 K, but the vanadium-containing slags's viscosity could significantly worsen at temperatures below 473 K. 18,19,[27][28][29] In addition, the evolution of the bath temperature during the extraction process is at the range of 1 473-1 673 K, and the smelting time is merely 15 min. Under high vanadium-extraction temperature (1 473-1 673 K) and short smelting time (15 min), spinels in vanadium-containing slags are not conducive to growth to cause smaller grain size, which seriously affects the subsequent vanadium-extraction process.…”

Section: Crystallization Behavior and Growth Mechanisms Of Spinel Crymentioning

confidence: 99%

Crystallization Behavior and Growth Mechanisms of Spinel Crystals in Vanadium-Containing Slags

Huang

Liu

2020

ISIJ Int.

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Evolution of Viscosity and Structure Property during Aluminothermic Reduction of Vanadium‐Enriched Slag

Zhang

Chen

Sun

2022

steel research int.

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Aluminum dross is a promising reductant for extracting vanadium to enable the direct production of ferrovanadium alloy in pre-reduced vanadium-rich slag (PVS). The evolution of the viscosity of PVS is measured with various A/M ratios (w()), representing different reduction stages. The compositions and structural properties of the melts are analyzed using X-ray powder diffraction, scanning electron microscopy, and Raman spectroscopy. The results show that with an increase in the mass ratio of Al 2 O 3 to (FeOþCr 2 O 3 þMnOþV 2 O 3 þAl 2 O 3 ) in the slag transformed from a solid-liquid mixture to a single liquid phase at 1873 K. When A/M increases from 0.29 to 0.53, Q 0 and Q 1 polymerize into Q 2 , resulting in a slow increase in viscosity from 0.091 to 0.158 Pa s. As A/M further increased to 1.00, Q 0 disappeared, Q 3 appeared, and the fraction of Al-O-Si increased to 37.7%, indicating that the simple aluminosilicate structural units are polymerized into complex structural units. Meanwhile, the viscosity increases to 0.338 Pa s. Al 2 O 3 acts as a network former and strengthens the degree of polymerization of the melt. The variation ranges of the apparent activation energy, structural complexity, and the average number of non-bridging oxygen are 139.23-215.12 kJ mol À1 , 0.57-2.97, and 2.16-1.05, respectively.

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Experimental Study on the Formation of V-Rich Spinel Phase in CaO-SiO2-MgO-FeOt-Al2O3-V2O3-P2O5 Slags at 1573 K (1300 °C)

Cited by 10 publications

References 19 publications

Effect of Reduction Degree on Characteristics of Slag Formed by Melting Hydrogen‐Reduced DRI and Partitions of P and V between Slag and Metal

Effect of Reduction Degree on Characteristics of Slag Formed by Melting Hydrogen‐Reduced DRI and Partitions of P and V between Slag and Metal

Crystallization Behavior and Growth Mechanisms of Spinel Crystals in Vanadium-Containing Slags

Evolution of Viscosity and Structure Property during Aluminothermic Reduction of Vanadium‐Enriched Slag

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