Abstract: The process of oxygen pressure leaching of converter vanadium slag with titanium dioxide waste without roasting was researched. Thermodynamic analysis indicates that: soluble vanadium ions are stable in the acid solution. Leaching experiments show that the initial acid concentration is the most important factor in the leaching process. Under the conditions: leaching temperature 150℃， leaching time 40min， liquid to solid ratio 12∶1(ml·g-1)， initial acid concentration 250g·L-1， oxygen pressure 02MPa， the vanadium leaching rate is 9851%. The XRD patterns of leaching residues under different conditions show that with the increase of vanadium leaching rate， the vanadium spinel phase is gradually disappeared and ilmenite phase is transformed into anatase phase in the leaching residue.

Key words: vanadium, titanium dioxide waste, oxygen pressure leaching, converter vanadium slag, resource utilization