基于P204-span80-煤油液膜萃取体系的高效选择性提钒及过程传质机理研究

Currently, the strong acid leaching of vanadium extraction process is not selective, resulting in a large number of impurity ions dissolve out with vanadium, leading to a long process, pharmaceutical consumption, and poor separation in purification enrichment process. Aiming at the existing problems, in this study liquid membrane separation technology is employed to the selective extraction of vanadium from acid leachate of stone coal, first optimized surfactant, membrane stabilizer, extraction agent, diluent and internal phase is chosed according to the solution properties of acid leachate of stone coal, then the stability of liquid membrane will be studied. On the basis of the good stability of liquid membrane, study the transport of vanadium and separation with impurity ions, establish the dynamic model to describe the migration process of vanadium and calculate the thermodynamic parameters related, finally expound the mechanism of liquid membrane separation and improve the liquid membrane separation and purification technology theory of acid leachate of stone coal.

现有石煤提钒强酸浸出不具选择性，大量杂质离子在浸出过程中随钒溶出，导致酸浸液净化富集工序存在流程长、药剂耗量大、杂质离子与钒分离效果不理想等问题。本项目采用液膜萃取技术分离纯化石煤提钒酸浸液，根据溶液性质采用合适的表面活性剂、膜添加剂、载体、膜溶剂以及内相溶液制备液膜并对液膜的稳定性进行研究，在保证液膜低溶胀率及破裂率的基础上实现钒离子的选择性萃取-反萃同时完成。并考察液膜萃取过程中钒的迁移规律以及钒与杂质离子的分离机制，建立动力学模型描述钒的迁移过程，同时对相关的化学反应热力学进行计算，最终从动力学与热力学的角度阐释液膜萃取的内在本质，建立液膜分离纯化石煤提钒酸浸液理论体系。

现有石煤提钒强酸浸出不具选择性，大量杂质离子在浸出过程中随钒溶出，导致酸浸液净化富集工序存在流程长、药剂耗量大、杂质离子与钒分离效果不理想等问题。本项目采用液膜萃取技术分离纯化石煤提钒酸浸液，根据溶液性质采用合适的表面活性剂、膜添加剂、载体、膜溶剂以及内相溶液制备液膜并对液膜的稳定性进行研究，在保证液膜低溶胀率及破裂率的基础上实现钒离子的选择性萃取-反萃同时完成。并考察液膜萃取过程中钒的迁移规律以及钒与杂质离子的分离机制，建立动力学模型描述钒的迁移过程，同时对相关的化学反应热力学进行计算，最终从动力学与热力学的角度阐释液膜萃取的内在本质，建立液膜分离纯化石煤提钒酸浸液理论体系。