中空纤维膜萃取与超滤耦合富集铟In(Ⅲ)

In(Ⅲ) enrichment with combining hollow fiber supported liquid membrane and ultra-filtration process

研究中空纤维膜萃取与超滤耦合工艺从模拟含铟酸性浸出液中提取铟的效率,考察反萃相与萃取相混合配比、混合液流速、原料液与混合液温度变化等参数对系统提铟效果的影响。结果表明:反萃相与萃取相体积之比(A/O)在一定范围内,在A/O=4时系统反萃相中In(Ⅲ)的富集量达到最大;随混合液流速的增大,系统的传质性能降低;原料液与混合液等温变化对系统提铟效果的影响并不显著。对比含In(Ⅲ)、Fe(Ⅲ)、Zn(Ⅱ)三组分原料液与In(Ⅲ)、Fe(Ⅲ)两组分原料液的实验结果可知,原料液中Zn(Ⅱ)的大量存在会干扰In(Ⅲ)的萃取,需要对多组分原料液进行预处理以排除竞争离子的干扰,才能实现较好的提铟效果。

A hollow fiber supported liquid membrane （HFSLM） and ultra-filtration（UF） hybrid system for separation of In（III） was investigated. The effects of volume ratio（A/O） and flow rate of the stripping mixture as well as the feed and mixture temperature on the extraction efficiency were studied. The results show that within a certain range, the effect of the temperature of the system on the extraction of In（Ⅲ） was not notable. In（Ⅲ） in the stripping phase could reach the highest enrichment when A/O was 4：1. The mass transfer rate decreased with the increase in the stripping mixture flow rate. The results of tests treating the feed containing In（Ⅲ）, Fe（Ⅲ） and Zn（Ⅱ） and the one containing In（Ⅲ） and Fe（Ⅲ） show that the existence of Zn（Ⅱ） competes with In（Ⅲ） in extraction. Therefore, in order to obtain the excellent extraction of In（Ⅲ）, it is necessary to remove the competing metal ions in a pretreatment process.