(昆明理工大学 材料与冶金工程学院，昆明 650093)
摘 要: 提出一种在加压条件下酸浸黑色页岩型矿提取钒的新工艺，研究浸出过程中各种工艺参数对钒浸出率指标的影响，同时进行了两段逆流浸出实验；利用电子探针分析矿石中钒在各物相中的分配情况，并在两段逆流浸出基础上进一步强化实验条件，考察了钒浸出率与矿石中钒赋存状态之间的关系。结果表明：该工艺的最佳工艺参数如下，即时间3 h、温度150 ℃、液固比1.2׃1、硫酸用量25%、85%矿石粒度粒经小于0.095 mm；在此条件下，钒的一段浸出率为77%左右，而矿石经过两段逆流浸出后，钒浸出率可达90%；钒浸出率与矿石中难溶硅铝酸盐相中的钒占有率呈现消长关系。
关键字: 石煤；氧压酸浸；硫酸亚铁；钒；浸出率
pressure acid leaching
（College of Material and Metallurgical Engineering, Kunming University of Science and Technology,
Kunming 650093, China）
Abstract:A new technique of recovery of vanadium from black shale by pressure acid leaching was investigated. The influences of changing parameters of pressure acid leaching process on the leaching rate of vanadium were discussed, and the experiment of two-step countercurrent leaching was developed. The distribution of vanadium in black shale was analyzed by SEM and the leaching conditions was strengthened on the foundation of two-step countercurrent leaching. The results show that the optimal parameters of this technique are as time of 3 h, temperature of 150 ℃, ratio of liquor to solid of 1.2׃1, H2SO4 additions of 25%, 85% material granularity of 0.095 mm. The one-step leaching percent of vanadium can reach 77%, the leaching percent obtain 90% after two-step countercurrent leaching. The vanadium leaching percent have growth and decline relation to occupation ratio of vanadium in in-soluble silicoaluminate mineral.
Key words: black shale; acid pressure leaching; ferrous sulfate; vanadium; leaching rate
