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

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

doi:10.1007/s11663-020-01904-x

Cited by 3 publications

(1 citation statement)

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“…Based on the distribution of highly valuable elements in vanadium slag, Svelgen and other researchers attempted a direct reduction of vanadium slag for the production of FeV alloy using two-step pyrometallurgy. [7][8][9][10][11][12] This method avoided the cumbersome roasting-leaching process in the production of vanadium pentoxide. The first step, namely, the pre-reduction process, achieved the maximum removal of metal oxides such as FeO and Cr 2 O 3 while retaining V 2 O 3 , and pre-reduced vanadium-rich slag (PVS) was obtained.…”

Section: Introductionmentioning

confidence: 99%

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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