(1. 武漢科技大學 資源與環(huán)境工程學院，武漢 430081；
2. 武漢科技大學 國家環(huán)境保護礦冶資源利用與污染控制重點實驗室，武漢 430081；
3. 武漢科技大學 釩資源高效利用湖北省協(xié)同創(chuàng)新中心，武漢 430081)
摘 要: 為強化釩與雜質離子的分離，研究以N235為載體的支撐液膜體系從釩頁巖酸浸液中直接萃取釩時載體濃度、稀釋劑種類、反萃劑種類及濃度、浸出液pH對釩傳質過程的影響，以及釩與浸出液中主要雜質離子鐵、磷、鋁的分離規(guī)律。結果表明：當萃取劑的體積濃度10%、煤油為稀釋劑、Na2CO3作反萃劑且濃度為0.6 mol/L、料液相pH=1.8、傳質時間13 h時，釩的萃取率可達92%，同時硅的萃取率為6.1%，磷的萃取率為4.2%，鐵、鋁等金屬離子的萃取率低于2%。采用一級動力學模型計算了傳質過程的相關擴散參數(shù)。最后為考察支撐液膜的穩(wěn)定性進行了循環(huán)試驗，經(jīng)過9次循環(huán)，萃取率仍能達到70%，膜經(jīng)再生后萃取率為90.1%，僅比新膜的萃取率低1.9%。
關鍵字: 釩頁巖；支撐液膜；N235；分離；動力學模型
（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
