<p>The vanadium recovery behavior from a Korean vanadium-bearing titaniferous magnetite (VTM) concentrate containing 0.8% vanadium as V<sub>2</sub>O<sub>5</sub> was comprehensively investigated in mineralogical and metallurgical ways. To recover vanadium from the concentrate, it was treated by a consecutive pyro-hydrometallurgical process of salt roasting-water leaching. Different roasting conditions were primarily tested to investigate the extraction behavior considering the amount of salt (Na<sub>2</sub>CO<sub>3</sub>) (10–30 wt%), roasting temperature (850–1100°C), and duration (0.5–3&#xa0;h). The extent of vanadium extraction was determined by water leaching, and the vanadium leaching efficiency was measured. Extensive mineralogical analyses of the roasted products were conducted using X-ray diffraction, mineral liberation analysis, and X-ray photoelectron spectroscopy. The oxidative reaction of the host mineral, magnetite, containing vanadium in its lattice, to hematite was found to proceed faster at higher roasting temperatures. Moreover, at elevated temperatures, the salt was more liquefied and actively reacted with the minerals by penetrating deeply into the concentrate particles. Therefore, vanadium extraction was found to be more effective under certain conditions that could accelerate vanadium exposure, including a higher Na<sub>2</sub>CO<sub>3</sub> content (≥ 20 wt%) and roasting temperature (&gt; 900°C). The highest vanadium leaching efficiency was 84.4% at the roasting conditions of 20 wt% Na<sub>2</sub>CO<sub>3</sub>, 1100°C, and 3&#xa0;h. An additional surface analysis identified the vanadium exposure on the concentrate surface during the oxidative salt roasting process. This study would provide the detailed information regarding the mineralogical and metallurgical characteristics of the Korean VTM ore, applying salt roasting-water leaching process.</p>

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Comprehensive Mineralogical and Metallurgical Interpretation on the Recovery of Vanadium from a Korean Vanadium-Bearing Titaniferous Magnetite Ore via Pyro-Hydrometallurgical Consecutive Process

  • Rina Kim,
  • Kyeong Woo Chung,
  • Sujeong Lee,
  • Min-seuk Kim,
  • Jae-chun Lee,
  • Chul-Woo Nam,
  • Ho-Sung Yoon,
  • Chul-Joo Kim

摘要

The vanadium recovery behavior from a Korean vanadium-bearing titaniferous magnetite (VTM) concentrate containing 0.8% vanadium as V2O5 was comprehensively investigated in mineralogical and metallurgical ways. To recover vanadium from the concentrate, it was treated by a consecutive pyro-hydrometallurgical process of salt roasting-water leaching. Different roasting conditions were primarily tested to investigate the extraction behavior considering the amount of salt (Na2CO3) (10–30 wt%), roasting temperature (850–1100°C), and duration (0.5–3 h). The extent of vanadium extraction was determined by water leaching, and the vanadium leaching efficiency was measured. Extensive mineralogical analyses of the roasted products were conducted using X-ray diffraction, mineral liberation analysis, and X-ray photoelectron spectroscopy. The oxidative reaction of the host mineral, magnetite, containing vanadium in its lattice, to hematite was found to proceed faster at higher roasting temperatures. Moreover, at elevated temperatures, the salt was more liquefied and actively reacted with the minerals by penetrating deeply into the concentrate particles. Therefore, vanadium extraction was found to be more effective under certain conditions that could accelerate vanadium exposure, including a higher Na2CO3 content (≥ 20 wt%) and roasting temperature (> 900°C). The highest vanadium leaching efficiency was 84.4% at the roasting conditions of 20 wt% Na2CO3, 1100°C, and 3 h. An additional surface analysis identified the vanadium exposure on the concentrate surface during the oxidative salt roasting process. This study would provide the detailed information regarding the mineralogical and metallurgical characteristics of the Korean VTM ore, applying salt roasting-water leaching process.