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Recovery of vanadium from vanadium slag by composite additive roasting–acid leaching process

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Abstract

To minimize the vanadium content in the vanadium extraction tailings, composite additive roasting with (CaO + MgO) and subsequent acid leaching process was carried out dealing with vanadium-bearing converter slag. The effect of additive with different MgO/(CaO + MgO) molar ratios on the roasting and leaching behaviours of vanadium slag was investigated, and the optimum process conditions were obtained. The results show that in the roasting experiment, under the conditions of roasting temperature of 850 °C and roasting time of 2 h, the main kinds of vanadate transformed from Ca2V2O7 to Ca5Mg4V6O24 and then to Mg2V2O7 with the increase in the MgO/(CaO + MgO) molar ratio. In the leaching experiment, under the conditions of particle size less than 75 μm, leaching temperature of 50 °C, pH of 2.5, liquid–solid ratio of 20:1, and MgO/(CaO + MgO) molar ratio of 1:3, the leaching efficiency of vanadium is increased by about 5%, but the substitution of MgO for most or all of CaO will significantly reduce the leaching efficiency of vanadium. Furthermore, the leaching efficiency of impurities (P and Cr) can also be decreased by a composite addictive (CaO + MgO) roasting process. The X-ray diffraction, scanning electron microscopy, energy dispersive spectrometry, and X-ray photoelectron spectroscopy of the original vanadium slag and solid products of both roasting and leaching processes were also evaluated.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 52004044), the Natural Science Foundation of Chongqing (Nos. cstb2022nscq-msx0801 and cstc2019jcyjjqX0024), the Foundation of Chongqing University of Science and Technology (No. ckrc2022030), the Graduate Research Innovation Project of Chongqing University of Science and Technology (No. YKJCX2220216), the Science and Technology Innovation Training Program of Chongqing University of Science and Technology (No. 2022046), and the College Students' innovation and entrepreneurship training program of Chongqing University of Science and Technology (No. 2022007).

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Authors and Affiliations

  1. College of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing, 401331, China

    Jun-yi Xiang, Ming-shuai Luo, Xi Lu, Lu-wei Bai, Zhong-peng Zhu, Qing-yun Huang & Sheng-qin Zhang

  2. College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China

    Kun-peng Guo & Xue-wei Lv

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  1. Jun-yi Xiang
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Xiang, Jy., Luo, Ms., Lu, X. et al. Recovery of vanadium from vanadium slag by composite additive roasting–acid leaching process. J. Iron Steel Res. Int. 30, 1426–1439 (2023). https://doi.org/10.1007/s42243-023-01006-3

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