【液膜分离在稀土资源回收中的应用研究之八-迁移镧的数学模型镧铈镨钕的全分离】方建章.pdf
摘 要 用乳状液膜法对轻稀土元素进行全分离至今尚末有文献报道。本文采 用氧化还原液膜法提铈,络合交换液膜法提和络合交换推拉液膜体系分离 错、,分别得到了纯度大于99 的、铈、错和钕。为了达到这一目的,本文进行了如下五个方面的工作.1.本文对氧化还原液膜法提铈,络合交换液膜法提镧和络合交换推拉 液膜体系分离、的机理分别进行了理论分析,结果表明:①对于氧化还原液膜法提取铈,当反萃相中的还原剂将四价铈络合物 还原成三价铈络合物时,由于料液和反萃相皆能反萃Ce”+.因此料液的竞争 反萃是降低铈回收率的主要因素。
Abstract Systematic seperation of La、Ce、Pr and Nd from 1ight earths by emulsion liquid membrane(ELM) were reported in the first time in this paper.At first Ce was recoveredbyanoxidation-reduc-tionELM,and then La by acomplexing-exchangingELM.
mobile carrier andXas a complex agent wereinvestigated.Under optimmoperationconditionsobtained,seperationofLafromthe light rare earthsfrom which Ce had been recovered previously by anoxidationreductionELMwasconducted.throughtwostagestest, 99 pureLawitharecovery of84 wasobtained.