Effects of phase structure of vanadium slags with different calcium content on calcified vanadium extraction

Yu Tangxia; Wen Jing; Sun Hongyan; Li Fangfang; Jiang Tao

doi:10.7513/j.issn.1004-7638.2021.05.003

Volume 42 Issue 5

Oct. 2021

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Yu Tangxia, Wen Jing, Sun Hongyan, Li Fangfang, Jiang Tao. Effects of phase structure of vanadium slags with different calcium content on calcified vanadium extraction[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(5): 18-23. doi: 10.7513/j.issn.1004-7638.2021.05.003

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Yu Tangxia, Wen Jing, Sun Hongyan, Li Fangfang, Jiang Tao. Effects of phase structure of vanadium slags with different calcium content on calcified vanadium extraction[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(5): 18-23. doi: 10.7513/j.issn.1004-7638.2021.05.003

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Effects of phase structure of vanadium slags with different calcium content on calcified vanadium extraction

doi: 10.7513/j.issn.1004-7638.2021.05.003

School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China

Received Date: 2021-06-02
Publish Date: 2021-10-30

Abstract

Abstract

In this paper, the vanadium slags with different calcium contents were obtained by remelting and crystallizing the mixture of CaO and Xichang vanadium slag with low-CaO contents. The changes of phase and micromorphology of vanadium slags with different calcium contents were observed by XRD and SEM-EDS. Furthermore, the law of phase changing of roasted samples and the impact on vanadium leaching rate were explored. The results showed that as the CaO mass fraction in vanadium slags rose, the spinel size gradually increased, and the olivine phase Fe₂SiO₄ gradually changed to Ca₂SiO₄. When the CaO content rose to 9.7%, part of Ti began to transfer from spinel to CaTiO₃. When the CaO content further rose to 13.7%, the spinel shape became irregular, and the silicate was gradually complicated. V was produced as Ca₂V₂O₇ for low-calcium contents in vanadium slags after calcification roasting. As the calcium content rose to 3.7%, Ca₃V₂O₈ gradually generated. The highest vanadium leaching rate was 87.52% when the calcium content was 2.7%. As calcium content increased further, the vanadium leaching rate decreased slightly. The calcium contents in vanadium slags would influence the amount of calcium salt additives during the calcium roasting process and the vanadium leaching rate at this point.
- vanadium slag,
- the calcium content,
- phase changes,
- micromorphology,
- calcified vanadium extraction

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References(15)

References

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