采用乳状液膜法全分离１５种单一稀土元素的系统性研究的最后两个元素钬与铒的分离在前期研究的基础上，采用Ｐ５０７－ＬＭＳ－２－磺化煤油－ＨＣｌ液膜体系，研究了各主要影响因素，在最佳实验条件下，经三级分离，可得纯度９７４％的铒和纯度９９８％的钬 The separation of holmium and erbium from the last two elements of a systematic study using emulsion liquid membrane for the complete separation of 15 single rare earth elements was based on P507-LMS-2-sulfonated kerosene-HCl liquid membrane system. Based on the previous studies, The main influencing factors were studied. Under the optimal experimental conditions, erbium with purity of 974% and holmium  purity with purity of 998% were obtained after three stages of separation.