The application of microwave irradiation technology on the preparation of V2O5 from ammonium polyvanadate (APV)

Pu, Juan; Gao, Lei; Yang, Zhi; Kang, Juanxue; Zhang, Mingyuan; Ruan, Rongsheng; Peng, Jinhui; Guo, Cheng

doi:10.1016/j.jtice.2020.02.010

Cited by 9 publications

(1 citation statement)

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“…The bonds between vanadium and oxygen can be divided into three types: 1) symmetric stretching vibration of the threefold coordinated oxygen atoms in V-O-V at 690-710 cm À1 , 2) in-phase tension vibration of the V ═ O bond at 995 cm À1 , and 3) bending vibration of the doubly coordinated oxygen atoms in V-O-V at 480 cm À1 . [53][54][55] In this study, the first type of bond was the main structural unit in the melts. Moreover, the combined capacity of Si 4þ and O 2À was stronger than that of V 3þ and O 2À .…”

Section: Structure Propertymentioning

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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Section: Structure Propertymentioning

confidence: 99%