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为了缩短工艺流程,提高分离效率,许多单位都相继进行了三出口萃取分离工艺的研究。研究结果表明,三出口工艺不仅可应用于稀土元素的分离,而且还可应用于非稀土元素的分离。若采用三出口工艺分离Sm、Eu、Gd或Gd、Tb、Dy,可一次得到三个产品,即纯Sm、Gd及富Eu、或纯Gd、Dy和富Tb。由于缩短了工艺流程,从而提高了贵重稀土元素Eu和Tb的收率。三出口工艺应用于Cu、Co、Ni的分离时,可同时得到较纯的Cu、Ni及含量高于90％的Co产品,缩短了工艺流程,降低了消耗。
In order to shorten the process and improve the separation efficiency, many units have carried out three export extraction and separation processes. The results show that the three exit process can be applied not only to the separation of rare earth elements, but also to the separation of non-rare earth elements. If three export processes are used to separate Sm, Eu, Gd or Gd, Tb and Dy, three products can be obtained at a time, namely pure Sm, Gd and Eu, or pure Gd, Dy and Tb-rich. As a result of shortening the process, thereby increasing the precious rare earth elements Eu and Tb yield. When the three export processes are applied to the separation of Cu, Co and Ni, relatively pure Cu, Ni and Co products with the content higher than 90% can be simultaneously obtained, which shortens the process flow and reduces the consumption.