Clean process for vanadium extraction from vanadium-bearing converter slag

The clean extraction of vanadium from vanadium-bearing converter slag (VBCS) has important implications for the sustainable development of the vanadium industry. In this work, a process that included sieving, nonsalt roasting, and sulfuric acid leaching was carried out to extract vanadium from VBCS. First, through sieving, large particles of metallic iron were removed and vanadium with particle sizes of less than 150 & mu;m was preliminarily enriched. Subsequently, the nonsalt roasting process was investigated in terms of the effects of temperature and time and the phase transformation mechanism. The structures of vanadium ferrospinel and fayalite were destroyed completely after roasting at 900 degrees C for 1.5 h, and vanadate, Fe2O3, SiO2, and Fe2TiO5 formed in the roasted product. Finally, the systematic sulfuric acid leaching experiment demonstrated that over 97% of va-nadium was extracted under optimal conditions. Meanwhile, the phase analysis of the leaching residue confirmed that vanadate was selectively leached into the solution.

Automated summary

The clean extraction of vanadium from vanadium-bearing converter slag is crucial for the sustainable development of the vanadium industry. A process involving sieving, nonsalt roasting, and sulfuric acid leaching was utilized to extract vanadium from the slag, resulting in over 97% extraction efficiency.