QIAO Lu, XIANG Junyi, HUANG Qingyun, LI Lanjie, LÜ Xuewei. Efficient metallurgical extraction of vanadium slag: mechanochemically enhanced sodium salt roasting vanadium extraction process[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(3): 12-17. doi: 10.7513/j.issn.1004-7638.2025.03.003
Citation: QIAO Lu, XIANG Junyi, HUANG Qingyun, LI Lanjie, LÜ Xuewei. Efficient metallurgical extraction of vanadium slag: mechanochemically enhanced sodium salt roasting vanadium extraction process[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(3): 12-17. doi: 10.7513/j.issn.1004-7638.2025.03.003

Efficient metallurgical extraction of vanadium slag: mechanochemically enhanced sodium salt roasting vanadium extraction process

doi: 10.7513/j.issn.1004-7638.2025.03.003
  • Received Date: 2025-01-07
  • Publish Date: 2025-06-30
  • To resolve the low conversion rate in single-pass roasting and ring formation in rotary kilns during conventional sodium roasting-water leaching process, this study proposed an innovative mechanical activation-granulation co-pretreatment technology. High-energy ball milling was introduced to promote phase dissociation and microstructure modification of vanadium slag, significantly enhancing its reactivity. Granulation process was optimized to improve heat transfer uniformity and oxidation rate of raw materials. Through XRD, laser particle size analysis, and BET measurements, the physicochemical evolution of vanadium slag was systematically characterized. Results indicate that mechanical activation can cause lattice distortion and diffraction peak broadening. It reduces the average particle size of vanadium slag from 43.035 μm to 7.627 μm and increases the specific surface area from 0.725 m2/g to 2.514 m2/g. The optimal roasting temperature is reduced by 50 °C, achieving a 95.38% vanadium leaching rate in single-pass roasting. This technology not only improves vanadium yield at lower temperatures but also effectively prevents rotary kiln ring formation, enabling an efficient and clean extraction process.
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