Cleaner and effective extraction and separation of iron from vanadium slag by carbothermic reduction-chlorination-molten salt electrolysis

Liu, Shiyuan; He, Xiaobo; Wang, Yadun; Wang, Lijun

doi:10.1016/j.jclepro.2020.124674

Cited by 38 publications

(13 citation statements)

References 41 publications

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“…The value of Δ G θ for FeV 2 O 4 reduction by Si to Fe and V 2 O 3 was obviously lower than Fe and V at the same temperature, indicating that FeV 2 O 4 reduction was stepwise. The reduction path was considered as followed: FeV 2 O 4 → Fe + V 2 O 3 → Fe + V, which was consistent with the research results by Liu et al [ 40 ] Meanwhile, Fe 2 TiO 4 reduction by Si was also stepwise, and the reduction path occurred in the sequence Fe 2 TiO 4 → Fe + FeTiO 3 → Fe + TiO 2 . However, FeV 2 O 4 , FeCr 2 O 4 , and Fe 2 TiO 4 reductions by SiC were the solid–solid reactions between spinel phases and reductants, whose reaction rates were greatly slow.…”

Section: Resultssupporting

confidence: 86%

Element Migration Behaviors During the Reduction of Vanadium Slag for Iron‐Removal and Vanadium‐Enrichment

Zhang

Chen

Sun

et al. 2021

steel research int.

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The lengthy production procedures of FeV alloy from vanadium slag (VS) presently may cause high production costs and hazardous leaching liquor waste containing toxic V5+ and Cr6+ ions. A two‐step direct reduction technology is considered a short and environmental‐friendly process to solve the aforementioned problems. Solar grade silicon cutting slurry waste (SoG‐Siw) containing Si and SiC is regarded as an effective reductant to achieve comprehensive resource utilization and control reductant cost. The element migration behaviors during the reduction process are clarified from phase transitions and microcosmic features. The results showed that 78.7 wt% of Fe and 38.6 wt% of Cr migrated from slag to the metal phase with a mass ratio of pretreated SoG‐Siw (Si‐SiCmixt) to VS (S/V) of 0.15 after soaking at 1823 K for 60 min. The content of V2O3 is enriched from 12.14 to 16.13 wt%. The mass ratio of V to Fe increased from 0.28 to 1.40, satisfying the composition goal of the production of FeV60 alloy (50–65 wt% V). With an increase of S/V to 0.20, 4.6 wt% of V migrated from slag to the metal phase, causing the loss of vanadium. The reduction path is FeO → Fe2TiO4 → (Mn, Fe)(V, Cr)2O4 → (V, Cr)2O3.

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Section: Resultssupporting

confidence: 86%

Element Migration Behaviors During the Reduction of Vanadium Slag for Iron‐Removal and Vanadium‐Enrichment

Zhang

Chen

Sun

et al. 2021

steel research int.

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“…According to the research of Morita et al, 5,[30][31][32][33][34] in the CaO-SiO 2 -CrO x -Al 2 O 3 system at 1 500-1 600°C, the activity of CrO is greater than that of Cr 2 O 3 , which means that chromium divalent oxides are more likely to exist in the slag system. C. S. Kucukkaragoz 8) also proposed that in the early stage of smelting reduction of chromium ore, high-valent oxides of iron and chromium are reduced to FeO and CrO into the slag, and then further reduced to metal.…”

Section: Dissolution Kinetics Of Synthetic Fecr 2 O 4 In Cao-mgo-al 2...mentioning

confidence: 99%

“…The high-valance chromium element is toxic, and if the waste slag and liquid formed during the production process are treated improperly, it will also cause greater damage to the environment. [5][6][7] Therefore, if cheap chrome ore resources can be developed as raw materials for production, not only the resources can be used efficiently, but the damage to the environment can also be reduced.…”

Section: Dissolution Kinetics Of Synthetic Fecr 2 O 4 In Cao-mgo-al 2...mentioning

confidence: 99%

Dissolution Kinetics of Synthetic FeCr2O4 in CaO–MgO–Al2O3–SiO2 Slag

et al. 2022

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“…The decomposition product was prepared at 150 • C for 2.5 h. The valence state of titanium in the product was characterized by XPS, as shown in Figure 7, the binding energy peaks at 458.3 and 464.3 eV were assigned to Ti 4+ 2p 3/2 and Ti 4+ 2p 1/2 [18]. Therefore, titanium in the product exists in the form of anatase titanium dioxide with +4 valence.…”

Section: Characteristics Of the Precipitated Titanium Oxidementioning

confidence: 99%

Hydrothermal Separation of Titanium Vanadium and Chromium from a Pregnant Oxalic Acid Leachate

2022

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The separation of titanium, vanadium and chromium in vanadium slag (VS) is a difficult problem restricting the comprehensive utilization of VS. This paper presents the first study on the separation of titanium, vanadium and chromium from oxalic acid leachate of VS. Firstly, the separation of titanium from the leachate by hydrothermal method was studied. The results show that more than 99% of titanium in the leachate was precipitated in the form of spherical anatase TiO2 with the purity of 95.7%. Then, the extraction separation of vanadium and chromium from the titanium-free filtrate by three-stage extraction of acidified N235 extractant and four-stage stripping of HCl solution was investigated. The extraction mechanism was identified as the anion exchange reaction between acidified N235 extractant and vanadium and chromium complex anions, which were further stripped by HCl solution in the stripping process. After obtaining the concentrated and purified stripping solution containing vanadium and chromium, the separation of vanadium and chromium from the stripping solution by hydrothermal method was studied, and the product was mainly composed of VO2 and Cr2O3. This process provides an idea for the comprehensive utilization of titanium, vanadium and chromium in oxalic acid system.

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Cleaner and effective extraction and separation of iron from vanadium slag by carbothermic reduction-chlorination-molten salt electrolysis

Cited by 38 publications

References 41 publications

Element Migration Behaviors During the Reduction of Vanadium Slag for Iron‐Removal and Vanadium‐Enrichment

Element Migration Behaviors During the Reduction of Vanadium Slag for Iron‐Removal and Vanadium‐Enrichment

Dissolution Kinetics of Synthetic FeCr<sub>2</sub>O<sub>4</sub> in CaO–MgO–Al<sub>2</sub>O<sub>3</sub>–SiO<sub>2</sub> Slag

Hydrothermal Separation of Titanium Vanadium and Chromium from a Pregnant Oxalic Acid Leachate

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