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

Huang, Weijun; Liu, Yajing

doi:10.2355/isijinternational.isijint-2020-039

Cited by 10 publications

(5 citation statements)

References 35 publications

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“…The un-reduced vanadium with an occurrence state of V 2 O 3 or VO in molten slag is related to the content of the reduced product V and reducing agent Al [38]. When slag and alloy coexist in a smelting system, a large amount of reduced metal vanadium can form in the molten alloy phase through the equilibrium reaction between low-valence V 2 O 3 and VO and Al, as shown in reaction (9). The corresponding ∆G Θ for reaction (9) was calculated to be −85.0 kJ•mol −1 at 1800 • C, which means that VO is more thermodynamically stable than V 2 O 3 .…”

Section: Resultsmentioning

confidence: 99%

“…Vanadium-bearing slag is the most important secondary source, which is a by-product generated in the semi-steel producing and vanadium removal step in the steel-making process using vanadium-rich titanomagenetite ore as the raw material [7,8]. In vanadiumbearing minerals, vanadium in minerals is found in the form of vanadates or oxides, forming spinel group solid solutions together with iron, titanium, chromium or manganese [9,10]. Over the past 20 years, vanadium-bearing slags have mainly been treated using the sodium salt roast-leaching process or calcium salt roast-leaching process for the extraction of vanadium [11,12].…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of a Novel High-Efficiency SHS-EAH Multi-Stage DG-ADP Process for Cleaner Production of High-Quality Ferrovanadium Alloy

Yu,

Yuan,

Shi

et al. 2024

Metals

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A novel high-efficiency industrialized clean production technology based on multi-stage gradient batching and smelting was proposed for the production of high-quality ferrovanadium. The thermodynamic mechanism of aluminothermic reduction equilibrium, alloy settlement and raw material impurity distribution were confirmed, and a multi-stage double-gradient aluminum addition pattern (DG-ADP), the highly efficient separation of molten slag and alloy, and typical impurity control standards of raw materials were achieved on the basis of a self-propagating high-temperature synthesis with an electric auxiliary heating (SHS-EAH) process. The reduction efficiency, separation efficiency and the comprehensive utilization rate of the secondary resources were significantly improved, as the whole total vanadium (T.V) content in the industrially produced residue slag reduced from 2.34 wt.% to 0.60 wt.%, while the corresponding smelting yield increased from 93.7 wt.% to 98.7 wt.% and the aluminum consumption decreased from 510 kg·t−1 to 400 kg·t−1. The multi-stage DG-ADP process enabled the internal circulation of vanadium-bearing materials in the ferrovanadium smelting system, as well as the external circulation of iron and residue slag in the same system, and finally achieved the zero discharge of solid and liquid waste from the ferrovanadium production line, which provides a brand-new perspective for the cleaner production of ferrovanadium alloy.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of a Novel High-Efficiency SHS-EAH Multi-Stage DG-ADP Process for Cleaner Production of High-Quality Ferrovanadium Alloy

Yu,

Yuan,

Shi

et al. 2024

Metals

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show abstract

“…11. The shape of the particle size distribution curve at 1773-1623 K is a lognormal distribution function, which is shown in eqn (8). Because the vanadium slag in the molten state at this time is more mobile and supercooled, the crystal growth process at this time is essentially the adsorption of new atoms on the crystal surface at the solid-liquid phase interface.…”

Section: Crystallization Kinetics Of the Spinel During Isothermal Cry...mentioning

confidence: 99%

“…The calculated optimal growth temperature range of the spinel phase is consistent with the previous experiments. Huang 8 also found that the mean diameter and volume fraction of spinel crystals in vanadium slag increased with prolonging holding time and by decreasing the temperature in the actual smelting temperature range of 1573-1673 K. Feng 9 found that a TiO 2 content of 12 wt% in vanadium slag was the most conducive to the crystallization of the V-spinel. Through crystal structure characterization, the displacement mechanism of V and Ti in the vanadium spinel was obtained.…”

Section: Introductionmentioning

confidence: 97%

Crystallization behaviour and growth mechanisms of spinel crystals in vanadium slag with high MgO content

Diao,

Tao,

Lai

et al. 2024

CrystEngComm

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“…Cr2O3 and chromium-containing spinel phases have high melting points. The melting points of Cr2O3, FeCr2O4 and MgCr2O4 are 2435 °C, 2000 °C, and 2350 °C, respectively [5,6]. The high melting point phase in the slag is not conducive to the dissolution of lime.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cr2O3 on Physicochemical Properties of CaO-SiO2-FetO Slags during BOF Smelting Process of Chromium-Bearing Iron

et al. 2022

Metals

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The productivity of basic-oxygen-furnace (BOF) smelting process is directly affected by the slag-forming speed during the initial stage of converter. Therefore, it is essential to study the effect of different Cr2O3 content on the physicochemical properties of the primary slag in the smelting process of chromium-bearing semi-steel. In this work, Factsage8.1 software, X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) and a high-temperature melting point tester were used to study the effects of different Cr2O3 content on the melting temperature, solidification behavior, mineral composition, and other physicochemical properties of the CaO-SiO2-FetO system. The results showed that the melting temperature of slag samples increased from 1223 °C to 1354 °C as Cr2O3 increased from 0 wt% to 9.09 wt%. With the increase of Cr2O3, the content of CaFeSi2O6 decreased. Moreover, due to the addition of Cr2O3, the chromium-bearing spinel solid solution (Fe(Fe,Cr)2O4) began to form in the slag. Furthermore, Cr2O3 promoted the increase in the volume of free solid particles in the slag, resulting in an increase in slag viscosity. All in all, the increase of Cr2O3 content in the CaO-SiO2-FetO system will adversely affect the semi-steel steelmaking process.

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

Cited by 10 publications

References 35 publications

Evaluation of a Novel High-Efficiency SHS-EAH Multi-Stage DG-ADP Process for Cleaner Production of High-Quality Ferrovanadium Alloy

Evaluation of a Novel High-Efficiency SHS-EAH Multi-Stage DG-ADP Process for Cleaner Production of High-Quality Ferrovanadium Alloy

Crystallization behaviour and growth mechanisms of spinel crystals in vanadium slag with high MgO content

Effect of Cr2O3 on Physicochemical Properties of CaO-SiO2-FetO Slags during BOF Smelting Process of Chromium-Bearing Iron

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