Abstract: Engineering & Research Institute Co.,Ltd.of Nonferrous Metallurgy，Changsha 410011，China Effects of ozone on vanadium extraction efficiency with sulfuric acid leaching were studied using raw stone coal，weathering stone coal and roasted residue of raw stone coal as the subject，in order to find an appropriate exploitation and utilization technology for vanadium extraction.The results indicated that：①Vanadium leaching rate from stone coal，roasted residue and weathering stone coal was increased by ozone addition and increased with flow rate of ozone.②Ozone-aided efficiency was increased by raising the temperature.③Increasing concentration of sulfuric acid solution improved vanadium leaching efficiency of ozone from stone coal，while not the same for roasted residue of stone coal and weathering stone coal.④Vanadium leaching rate of stone coal ore，weathering stone coal and roasted residue was increased to 23.02%，61.05%，28.11% from 6.86%，51.81% and 24.24% respectively by addition of 25 L/h ozone flow，with 100 g sample at grain fineness of 78% passing 0.074 mm，sulfuric acid solution concentration of 25%，liquid to solid ratio of 5∶1，stirring speed of 600 r/min，at leaching temperature of 90 ℃ for 2 h，compared with that of without ozone,increased range reach 16.16，9.24 and 3.87 precentage points respectively.

Key words: Stone coal, Ozone, Leaching, Vanadium