Effect of TiO2on crystallisation of V concentrating phase in V bearing steelmaking slag

Li, L. S.; Wu, Xingrong; Yu, Li; Dong, Yuan

doi:10.1179/174328108x284561

Cited by 31 publications

(32 citation statements)

References 9 publications

(10 reference statements)

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“…Thus, the dynamics condition for vanadium-extraction becomes worse, and the yield ratio of vanadium is decreased. [11][12][13][14] Though the viscosity of Cr 2 O 3 -bearing slag would decease with increasing of the temperature, the oxidation of vanadium would be suppressed according to the selective oxidation theory, and thus the practical blowing smelting temperature is usually controlled below 1 653 K. [15][16][17] Therefore, study on the influence of Cr 2 O 3 on the properties of FeO-SiO 2 -V 2 O 3 (-TiO 2 ) system slag is very important to improve the blowing smelting technology for the vanadium-extraction from the chromiumbearing hot metal.…”

Section: Viscosity Property and Structure Analysis Of Feo-sio 2 -V 2 mentioning

confidence: 99%

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

Huang

Zhao

et al. 2016

ISIJ International

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Section: Viscosity Property and Structure Analysis Of Feo-sio 2 -V 2 mentioning

confidence: 99%

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

Huang

Zhao

et al. 2016

ISIJ International

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“…1,2 Vanadium exists mainly in the form of titaniferrous magnetite. The major vanadium products include ferrovanadium (FeV), V 2 O 5 , V 2 O 3 , VN and Al-V-Ti alloy.…”

Section: Introductionmentioning

confidence: 99%

Mineralogical characterisation of vanadium slag under different treatment conditions

Diao

Xie

Wang

et al. 2009

Ironmaking & Steelmaking

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Synthetic vanadium slags were melted at 1673 K and then cooled to a predetermined temperature at different cooling rates. The mineralogical phases and crystallisation behaviour were investigated based on optical microscopy, SEM, EDS and XRD analyses. The results show that spinels and silicates were the major phases in the complex vanadium slag samples, and V is enriched in the spinel phases, i.e. Fe x V 32x O 4 and Mg x (V,Ti) 32x O 4 . The apparent diameter of spinel crystal grains decreases with increasing cooling rate, e.g. from 14 to 5 mm at 1523 K. Crystal grain size increases significantly with increasing holding time. It is also found that the grain sizes of spinels at higher temperatures, 1573 and 1623 K, are considerably smaller than at lower temperatures, 1473 and 1523 K. At lower temperature, large blocked spinel crystals between grey silicate phases are formed, whereas there only a few smaller blocked spinels when performed at higher temperature. Better control of the process cooling parameters will benefit vanadium slag quality.

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“…Therefore, in order to enhance the phosphorus content in the enriched phase, the steelmaking slags were usually modified by different additives, such as Al 2 O 3 , SiO 2 and TiO 2 , to explore the microstructure and the enhancement of the solubility of phosphorus enriched phase. 4,5,11) Although there exists extensive literatures studying the effect of fluorine on the dephosphorus process, 12,13) the effects on the viscosity and crystallization are limited; and the kinetics of the precipitation during the continuous cooling has not been documented.…”

Section: Viscous Flow and Crystallization Behaviors Of P-bearing Steementioning

confidence: 99%

Viscous Flow and Crystallization Behaviors of P-bearing Steelmaking Slags with Varying Fluorine Content

et al. 2016

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The role of fluorine in the CaO-SiO 2 -MgO-Al 2 O 3 -Fe t O steelmaking slags was investigated through analyzing the viscous flow and crystallization behaviors of the slags. It was found that the viscosity decreased with increasing CaF 2 content, which resulted from the decrease of the degree of polymerization (DOP) of the structures, as proved by O 1s X-ray photoelectron spectroscopy (XPS) and magic angular spinning nuclear magnetic resonance (MAS-NMR) analysis. The continuous cooling transformation (CCT) diagrams of the primary crystals were also constructed. The results showed that CaF 2 addition promoted the transformation of the primary crystal from spinel (MgFe 2 O 4 ) to flourapatite (Ca 5 (PO 4 ) 3 F), which was beneficial to the further enrichment of phosphorus. According to 19 F MAS-NMR results, F − ions mainly coordinate with Ca 2 + ions to form Ca-F bond. Furthermore, considering the greater stability of P-O-Ca than that of Si-OCa bonds, most of the F − ions behave as F-Ca-O-P band, which thus enhanced the formation of Ca 5 (PO 4 ) 3 F. Additionally, the non-isothermal crystallization kinetics was further analyzed and the activation energy for the primary crystal growth was derived.

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Effect of TiO₂on crystallisation of V concentrating phase in V bearing steelmaking slag

Cited by 31 publications

References 9 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

Mineralogical characterisation of vanadium slag under different treatment conditions

Viscous Flow and Crystallization Behaviors of P-bearing Steelmaking Slags with Varying Fluorine Content

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