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Microemulsion leaching of vanadium from sodium-roasted vanadium slag by fusion of leaching and extraction processes

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Abstract

The fusion of the leaching and purification processes was realized by directly using microemulsion as the leaching agent. The bis-(2-ethyhexyl) phosphoric acid (DEHPA)/n-heptane/NaOH microemulsion system was established to directly leach vanadates from sodium-roasted vanadium slag. The effect of the leaching agent on the leaching efficiency was investigated, in addition to the molar ratio of H2O/NaDEHP (W), DEHPA concentration, solid/liquid ratio, stirring time, and leaching temperature. In optimal situations, the vanadium leaching efficiency reaches 79.57%. The X-ray diffraction characterization of the leaching residue and the Raman spectrum of the microemulsion before and after leaching demonstrate the successful entry of vanadates from the sodium-roasted vanadium slag into the microemulsion. The proposed method successfully realizes the leaching and purification of vanadates in one step, thereby greatly reducing production costs and environmental pollution. It also offers a new way to achieve the green recovery of valuable metals from solid resources.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Nos. 51474041 and 51674051), Chongqing Science and Technology Bureau (No. cstc2019jcyjjqX0006), and Chongqing Talents Plan for Young Talents (No. CQYC201905050).

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Authors and Affiliations

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

    Yun Guo, Hong-yi Li, Yi-heng Yuan, Jie Huang, Jiang Diao, Gang Li & Bing Xie

  2. Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials, Chongqing University, Chongqing, 400044, China

    Yun Guo, Hong-yi Li, Yi-heng Yuan, Jie Huang, Jiang Diao, Gang Li & Bing Xie

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  1. Yun Guo
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  2. Hong-yi Li
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  3. Yi-heng Yuan
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  4. Jie Huang
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  5. Jiang Diao
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  6. Gang Li
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  7. Bing Xie
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Correspondence to Hong-yi Li.

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Guo, Y., Li, Hy., Yuan, Yh. et al. Microemulsion leaching of vanadium from sodium-roasted vanadium slag by fusion of leaching and extraction processes. Int J Miner Metall Mater 28, 974–980 (2021). https://doi.org/10.1007/s12613-020-2105-1

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  • DOI: https://doi.org/10.1007/s12613-020-2105-1

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