Vanadium Extraction from Vanadium Titanium-rich Material by Oxidation Roasting-acid Leaching

The vanadium extraction process from vanadium titanium-rich materials has been a topic of significant interest due to the rich resources available in China. The objective of this study was to investigate the leaching of vanadium through oxidation roasting followed by acid leaching, a method aimed at enhancing vanadium recovery. The methodology incorporated oxidation roasting to convert insoluble V (Ⅲ) to soluble V (Ⅳ) or V (Ⅴ), followed by leaching with sulfuric acid under controlled conditions. Results indicated that the optimized conditions for vanadium extraction achieved a leaching efficiency of 70.18% using a roasting temperature of 950 °C, a roasting duration of 40 minutes, sulfuric acid concentration of 40%, with a leaching time of 4 hours at 95 °C, and a liquid-to-solid ratio of 4:1. This study demonstrated that the combined oxidation roasting and acid leaching significantly improved the vanadium recovery from vanadium titanium-rich materials, thereby suggesting a viable method for comprehensive resource utilization. The findings emphasize that with proper process optimization, vanadium extraction from otherwise non-usable materials can be efficiently realized.