Acid Leaching Process in Extracting Vanadium from Blast Furnace Slag in Panzhihua Vanadium Titanium Magnetite

Vanadium titanium magnetite is a multi-element-coexistent iron ore which contain mainly iron, titanium, and vanadium. With present techniques, nearly all the iron but a small amount of vanadium were able to extracted from the magnetite. The V-bearing blast furnace slags cause the release of harmful substances into the environments as well as a waste of the vanadium resources. In this paper, the extraction of vanadium from blast furnace slag was studied by direct roasting and hydrochloric acid leaching techniques. The effects of processing parameters were studied on the extraction of vanadium. The results showed that the leaching rate of vanadium reached about 85.94% under the optimum conditions: mineral size of 200 meshes, the roasting temperature of 873 K, the roasting time of 120 min, the HCl concentration of 27.75%, the solid to liquid to ratio of 1:4 g/mL, the leaching temperature of 363 K, and the leaching time of 180 min. The obtained results in this study will have great impact on recycle and reuse of the vanadium resources from blast furnace slag.