一、前言 溶剂萃取技术早已在分析化学中应用。后来发展为湿法冶金的一项单元操作,主要用于稀土和稀散金属的分离和富集。近年来在富集分离和提纯重有色金属方面,这项技术又有很大的突破。溶剂萃取在理论上可以不排出废物,因而在实际生产流程中有可能组成一个闭合系统,避免废气和废水的污染。可以预料,随着综合利用的发展以及环 I. Introduction Solvent extraction technology has long been used in analytical chemistry. Later developed into a unit operation of hydrometallurgy, mainly for the separation and enrichment of rare earth and rare-earth metals. In recent years, enriching the separation and purification of heavy non-ferrous metals, this technology has a great breakthrough. Solvent extraction theoretically does not discharge waste, so in the actual production process may form a closed system to avoid the pollution of waste gas and waste water. It can be expected, along with the development of comprehensive utilization of the ring