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The Effect of Different Magnetic Separation Procedures of a Korean VTM Ore on Combined Pyro-hydrometallurgical Vanadium Recovery Behavior

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Abstract

The study focused on the recovery of vanadium from a Korean vanadium-bearing titaniferous magnetite (VTM) ore, examining the behaviors of magnetic separation and Na2CO3 roasting-water leaching. Two concentrates were prepared using single-stage dry magnetic separation and three-step wet magnetic separation, resulting in V2O5 grades of 0.8% and 1.0% and major gangue mineral SiO2 contents of 6.5% and 1.7%, respectively. These concentrates were subsequently roasted at 1050 °C with the addition of Na2CO3 and then water-leached at 25 °C. Various stoichiometric ratios of V2O5 to Na2CO3 were tested, ranging from 1:1 to 1:40 of the theoretically required amount. As the amount of Na2CO3 increased, the vanadium leaching efficiency showed fluctuations between 4 and 35% for ratios of 1:1 to 1:10, while it linearly increased from 4 to 82% for ratios of 1:10 to 1:40 in the leaching of the low-grade concentrate. In contrast, the leaching efficiency increased from 47 to 74% for ratios of 1:1 to 1:8 and then sharply rose to 84% at a ratio of 1:10 in the leaching of the high-grade concentrate. Subsequently, it reached a plateau of 92 to 94% for ratios of 1:20 to 1:40. The difference in leaching efficiency was primarily due to the reaction of gangue minerals with Na2CO3, which hindered vanadium leaching from the VTM concentrates. This hindrance was notably more pronounced in the low-grade concentrate with the lower salt ratio, as the gangue minerals exhibited a preference for consuming Na2CO3 over vanadium. The mineral formation was analyzed in detail using XRD and MLA to shed light on the mechanism of different vanadium leaching behavior depending on the concentrate grade and vanadium to salt ratio. Based on the results of this study, it is evident that applying a proper magnetic separation procedure is significant to achieving satisfactory vanadium recovery with less salt amount by removing gangue minerals ahead.

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Funding

This research was supported by the Basic Research Project (GP2022-010, 24-3212-1) of the Korea Institute of Geoscience and Mineral Resources (KIGAM), funded by the Ministry of Science and ICT of the Republic of Korea. This work was also supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government (MOTIE) (No. 20216110100040/IP2023-011).

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Authors and Affiliations

  1. Resources Utilization Division, Korea Institute of Geoscience and Mineral Resources, Daejeon, Korea

    Rina Kim, Yeongjin Ahn, Kyeong Woo Chung, Sujeong Lee, Min-seuk Kim, Byunghun Go, Hong-In Kim & Ho-Seok Jeon

  2. Resources Engineering, University of Science and Technology, Daejeon, Korea

    Rina Kim, Kyeong Woo Chung, Sujeong Lee, Hong-In Kim & Ho-Seok Jeon

  3. Western Australian School of Mines: Minerals, Energy and Chemical Engineering, Curtin University, Kalgoorlie, Australia

    Yuik Eom

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  1. Rina Kim
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Correspondence to Rina Kim.

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Kim, R., Eom, Y., Ahn, Y. et al. The Effect of Different Magnetic Separation Procedures of a Korean VTM Ore on Combined Pyro-hydrometallurgical Vanadium Recovery Behavior. Mining, Metallurgy & Exploration 41, 547–558 (2024). https://doi.org/10.1007/s42461-024-00943-1

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