Abstract
The growing demand for critical metals to supply the market has led to searches for new sources crucial to technological development. The present study aimed to leach Ti and V from the non-magnetic fraction of a non-oxidized Brazilian Fe-Ti-V deposit. Leaching experiments were carried out with HCl, and the effect of the solid–liquid ratio, time, temperature, acid concentration, and NaHF2 and Fe0 additions were evaluated. The extraction of Ti and V achieved 88.1% and 82.0%, respectively, using 30%HCl, solid–liquid ratio 1/6, and NaHF2 dosage 10% w/w at 85°C. Reducing leaching increased the yield to 95.1% and 91.4%, respectively. Kinetic modeling showed that the leaching of V fitted better for diffusion control through the fluid film, and Ti fitted better for solid product diffusion control. The hydrolysis step separated 98.5% of Ti in the solid phase with losses of Fe (9.5%) and V (5.7%). Therefore, the hydrometallurgical route designed is simple, and it is possible to obtain high-purity products.
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Acknowledgements
We thank the University of São Paulo for supporting this project and FAPESP (Grant: 2012/51871-9, 2019/11866-5, 2021/14842-0, São Paulo Research Foundation) and CAPES for the financial support. Thanks to the LCT laboratory for the chemical analysis.
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Domingos, A.E.E.C., Botelho Junior, A.B., Duarte, H.A. et al. Extraction of Critical Metals from Secondary Source: Leaching Ti and V from Brazilian Fe-Ti-V Deposit Residue. JOM 75, 1581–1590 (2023). https://doi.org/10.1007/s11837-023-05774-x
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DOI: https://doi.org/10.1007/s11837-023-05774-x