(昆明理工大學(xué) 冶金與能源工程學(xué)院，昆明 650093)
摘 要: 采用硫酸−氫氟酸−次氯酸鈉組合浸出體系浸取釩鈦磁鐵礦提釩尾渣中的釩，研究浸出過程中試劑濃度、浸出液固比、浸出溫度、浸出時間、物料粒度對釩浸出率的影響。結(jié)果表明：釩的浸出率隨試劑濃度、液固比、溫度和時間的升高而增大；當(dāng)?shù)V物粒度小于0.20 mm時，釩浸出率有隨礦物粒度變小而減小的趨勢。在物料粒度0.15~0.25 mm、初始硫酸濃度150 g/L、初始?xì)浞釢舛?0 g/L、次氯酸鈉加入量為礦量1.5%、礦漿液固比6:1、浸出溫度90 ℃、浸出時間6 h、攪拌速度500 r/min的條件下，釩的浸出率可達(dá)85%以上。
關(guān)鍵字: 提釩尾渣；組合浸出劑；釩浸出率
（Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology,
Kunming 650093, China）
Abstract: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%.
Key words: extracted vanadium residue; composed leaching reagent; vanadium leaching rate
