(1. 武汉科技大学 资源与环境工程学院，武汉 430081；
2. 武汉科技大学 国家环境保护矿冶资源利用与污染控制重点实验室，武汉 430081；
3. 武汉科技大学 钒资源高效利用湖北省协同创新中心，武汉 430081)
摘 要: 为强化钒与杂质离子的分离，研究以N235为载体的支撑液膜体系从钒页岩酸浸液中直接萃取钒时载体浓度、稀释剂种类、反萃剂种类及浓度、浸出液pH对钒传质过程的影响，以及钒与浸出液中主要杂质离子铁、磷、铝的分离规律。结果表明：当萃取剂的体积浓度10%、煤油为稀释剂、Na2CO3作反萃剂且浓度为0.6 mol/L、料液相pH=1.8、传质时间13 h时，钒的萃取率可达92%，同时硅的萃取率为6.1%，磷的萃取率为4.2%，铁、铝等金属离子的萃取率低于2%。采用一级动力学模型计算了传质过程的相关扩散参数。最后为考察支撑液膜的稳定性进行了循环试验，经过9次循环，萃取率仍能达到70%，膜经再生后萃取率为90.1%，仅比新膜的萃取率低1.9%。
关键字: 钒页岩；支撑液膜；N235；分离；动力学模型
（1. School of Resource and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China;
2. State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control, Wuhan University of Science and Technology, Wuhan 430081, China;
3. Hubei Collaborative Innovation Center for High Efficient Utilization of Vanadium Resources, Wuhan University of Science and Technology, Wuhan 430081, China）
Abstract:To enhance the separation efficiency of vanadium from impurities, the highly selective separation of vanadium from multiple impurities and the transport mechanism of vanadium from a black shale leaching-solution, by a supported liquid membrane (SLM) using trialkylamine (N235) as the carrier, were investigated. The effects of parameters, such as feed-solution pH, carrier concentration, stripping-solution species, and diluent nature, were studied. The highest value of P is obtained at a feed solution pH of 1.8, at a carrier concentration of 10% (volume fraction), with a stripping solution of 0.6 mol/L Na2CO3, and with kerosene as the diluent. By enhancing the competition for extraction, 92.0% of the vanadium, 6.1% of the Si, 4.2% of the P, and less than 2.0% of the Fe, Al, K, and Mg are transported through the membrane after 13 h. The diffusion parameters and facilitated transport mechanism are evaluated using a first-order kinetic model. In the membrane stability study, after nine runs using the same membrane, the vanadium extraction can still be about 70%. In addition, the membrane can be successfully regenerated through impregnation again and the vanadium extraction increases to be 90.1%, which is only 1.9% lower than the vanadium extraction at the first run.
Key words: black shale; supported liquid membrane; N235; separation; transfer model
