Study on Vanadium Extraction from Converter Vanadium-bearing Slag by Oxygen Pressure Acid-leaching

For researching a more efficient vanadium extraction process,the processes of atmospheric pressure acid-leaching without roasting,none salt roasting with atmospheric pressure acid-leaching and oxygen pressure acid-leaching without roasting were researched.The results indicate that:During the atmospheric pressure acid-leaching without roasting process,the leaching rate of vanadium increases with the enhancement of temperature and initial acid concentration,but the content of vanadium in the leaching residue is still high and the degree of utilization of vanadium slag is not enough;During the none salt roasting with atmospheric pressure acid-leaching process,the transformation of spinel phase in the roasting process is the key step for the vanadium extraction;In the process of oxygen pressure acid-leaching without roasting,under the conditions of initial acid concentration of 150 g/L,the oxygen partial pressure of 0.6 MPa and liquid-solid ratio of 8:1 at 110℃ for 45 min,the vanadium leaching rate is about 92%.