Effect of chemical composition on the element distribution, phase composition and calcification roasting process of vanadium slag

Tangxia Yu; Tao Jiang; Jing Wen; Hongyan Sun; Ming Li; Yi Peng

doi:10.1007/s12613-021-2334-y

Volume 29 Issue 12

Dec. 2022

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2022 > 29(12): 2144-2151

Tangxia Yu, Tao Jiang, Jing Wen, Hongyan Sun, Ming Li, and Yi Peng, Effect of chemical composition on the element distribution, phase composition and calcification roasting process of vanadium slag, Int. J. Miner. Metall. Mater., 29(2022), No. 12, pp. 2144-2151. https://doi.org/10.1007/s12613-021-2334-y

Cite this article as:

Tangxia Yu, Tao Jiang, Jing Wen, Hongyan Sun, Ming Li, and Yi Peng, Effect of chemical composition on the element distribution, phase composition and calcification roasting process of vanadium slag, Int. J. Miner. Metall. Mater., 29(2022), No. 12, pp. 2144-2151. https://doi.org/10.1007/s12613-021-2334-y

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Research Article

Effect of chemical composition on the element distribution, phase composition and calcification roasting process of vanadium slag

+ Author Affiliations

Corresponding authors:
Tao Jiang E-mail: jiangt@smm.neu.edu.cn

Jing Wen E-mail: wenjing@smm.neu.edu.cn
Received: 12 April 2021; Revised: 21 July 2021; Accepted: 23 July 2021; Available online: 24 July 2021

Abstract

Abstract

The chemical composition of vanadium slag significantly affects its element distribution and phase composition, which affect the subsequent calcification roasting process and vanadium recovery. In this work, seven kinds of vanadium slags derived from different regions in China were used as the raw materials to study the effects of different components on the vanadium slag’s elements distribution, phase composition, calcification roasting, and leaching rate of major elements using scanning electron microscope, X-ray diffraction analysis, and inductively coupled plasma-optical emission spectroscopy. The results show that the spinel phase is wrapped with silicate phase in all vanadium slag samples. The main elements in the spinel phase are Cr, V, and Ti from the interior to the exterior. The size of spinel phase in low chromium vanadium slag is larger than the other vanadium slags with higher chromium contents. The spinel phase of high-calcium and high-phosphorus vanadium slag is more dispersed. The strongest diffraction peak of vanadium spinel phase in the vanadium slag migrates to a higher diffraction angle, and (Fe_0.6Cr_0.4)₂O₃ is formed after calcification roasting as the chromium content increased. A large amount of Ca₂SiO₄ is produced because excess Ca reacts with Si in high-calcium and high-phosphorus vanadium slag. The vanadium leaching rate reaches 88% in some vanadium slags. The chromium leaching rate is less than 5% in all vanadium slags. The silicon leaching rate of high-calcium and high-phosphorus vanadium slag is much higher than that of the other slags. The leaching rate of manganese is higher than 10%, and the leaching rates of iron and titanium are negligible.
- vanadium slag;
- calcification roasting;
- element distribution;
- phase composition;
- leaching rate

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