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Efficient Vanadium Extraction from Vanadium Slag by Roasting-Free Assisted Acid Leaching: Pure Oxygen Oxidation of Molten Vanadium Slag

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Abstract

A method of roasting-free vanadium recovery from molten vanadium slag via pure oxygen oxidation-assisted acid leaching was investigated in order to implement efficient and green vanadium recovery. The oxidation process of molten vanadium slag discharged from converters by pure oxygen was simulated, and the phase evolution mechanism of pure oxygen vanadium oxide slag (POOVS) was analyzed. The law between phase evolution and the vanadium recovery rate was systematically expounded. According to the results, POOVS is a Fe2O3–V2O5–Mn2O3–TiO2–Cr2O3–SiO2 system, and 80.49 to 86.05 pct of vanadium is V5+. The vanadium leaching efficiency of POOVS reached 97.23 pct. In the range of CaO addition, with the increase of the CaO/V2O5 ratio, the vanadium-rich phase in POOVS changed from V2O5 and Mn2V2O7 to xCaO–V2O5, and the leaching efficiency of vanadium was improved. Under the guidance of response surface methodology, the optimal leaching process parameters were a leaching temperature of 70 °C, a leaching time of 1.63 hours, a H2SO4 concentration of 25 pct, and a solid–liquid ratio of 0.09 g/mL. The roasting-free pretreatment method of vanadium slag proposed in this paper uses the waste heat and reaction heat of vanadium slag to complete the mineral phase evolution, which is a green and efficient vanadium extraction technology.

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Acknowledgments

The authors are grateful for the financial support of this work from the National Natural Science Foundation of China (No. 52204419) the Natural Science Foundation of Liaoning Province (No. 2022-BS-076), and the Guangxi Science and Technology Major Project (No. 2021AA12013).

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The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. Key Laboratory for Ecological Metallurgy of Multimetallic Mineral of Ministry of Education, Northeastern University, Shenyang, 110819, P.R. China

    Han Yang, Yan Liu, Ting-an Zhang, Shengnan Lin & Kun Wang

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  1. Han Yang
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  2. Yan Liu
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  3. Ting-an Zhang
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  4. Shengnan Lin
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Yang, H., Liu, Y., Zhang, Ta. et al. Efficient Vanadium Extraction from Vanadium Slag by Roasting-Free Assisted Acid Leaching: Pure Oxygen Oxidation of Molten Vanadium Slag. Metall Mater Trans B 55, 1231–1243 (2024). https://doi.org/10.1007/s11663-024-02999-2

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