钒钛磁铁矿提钒尾渣浸取钒

采用硫酸氢氟酸次氯酸钠组合浸出体系浸取钒钛磁铁矿提钒尾渣中的钒,研究浸出过程中试剂浓度、浸出液固比、浸出温度、浸出时间、物料粒度对钒浸出率的影响。结果表明:钒的浸出率随试剂浓度、液固比、温度和时间的升高而增大;当矿物粒度小于0.20 mm时,钒浸出率有随矿物粒度变小而减小的趋势。在物料粒度0.15~0.25 mm、初始硫酸浓度150 g/L、初始氢氟酸浓度30 g/L、次氯酸钠加入量为矿量1.5%、矿浆液固比6:1、浸出温度90℃、浸出时间6 h、搅拌速度500 r/min的条件下,钒的浸出率可达85%以上。

Leaching vanadium from extracted vanadium residue of vanadium titanomagnetite

Vanadium was leached by composed leaching reagent of sulphuric acid,hydrofluoric acid and sodium hypochlorite from extracted vanadium residues of vanadium titanomagnetite.The process parameters,which impact on the vanadium leaching percent,such as reagent concentration,ratio of liquid to solid,temperature,leaching time,mineral granularity,were investigated.The results show that the vanadium leaching rate increases with the increase of reagent concentration,ratio of liquid to solid,temperature,leaching time and decreases with diminishment of the mineral granularity when the mineral granularity is less than 0.20 mm.The effect of sodium hypochlorite is smaller.When the extracted vanadium residues is leached with granular size of 0.15?0.25 mm,sulphuric acid concentration of 135 g/L,hydrofluoric acid concentration of 30 g/L,sodium hypochlorite dosage of 1.5%,ratio of liquid to solid of 6:1,stirring velocity of 500 r/min at 90 ℃ for 6 h,the leaching rate of vanadium is above 85%.