Y型微通道反应器强化萃取水相中铒的研究

本文采用Y型微通道萃取技术，以水溶液中稀土铒为研究对象，考察了Y型微通道尺寸、有机相浓度、皂化度、有机相中铒预负载量、水相初始pH值和水相初始铒浓度等因素对稀土铒萃取率的影响。结果表明，微通道尺寸对铒萃取率有重要影响，管径越长，萃取率越高；管径越小，萃取率越高。微通道长度为50cm，直径为0.6mm时，停留时间为2.12s，铒萃取率高达99.39%。随着有机相中P507浓度的增加，水相中铒萃取率增加。随着有机相中铒负载量的增加，水相中铒萃取率降低。随着有机相中P507皂化度的增加，铒萃取率先增加后降低，皂化度为5%时，萃取率最大。这是由于皂化度大于5%时，有机相理化性质的变化将会导致有机薄膜失稳，引起乳化，降低了萃取率。随水相初始pH值和初始铒浓度的增加，铒的萃取率均减小。本研究可为Y型微通道萃取技术在低浓度重稀土萃取上的应用提供理论基础和技术依据。

Study on enhancing extraction Erbium from aqueous feed solution by Y-type microchannel reactor

In this paper, Y-type microchannel extraction technology was adopted to study the effects of microchannel sizes, the concentration of P507 in organic phase,the saponification degree of P507, the concentration of pre-loaded Er in organic phase, the initial pH values and initial Er concentrations in aqueous feed solutions on the extraction rate of Er. The results indicated that the microchannel sizes have important influences on the extraction rate of Er. The longer the length of microchannel was, the higher the extraction rate was. The smaller the diameter of microchannel was, the higher the extraction rate was. When the length of the microchannel was 50cm and the diameter of the microchannel was 0.6mm, the residence time was 2.12s and the extraction rate of Er was high at 99.39%. The extraction rate increased with increases in the concentrations of P507 in the organic phase. The extraction rate decreased with increases in the concentration of pre-loaded Er in the organic phase. With the increases in saponification degrees of P507, the extraction rate first increased and then decreased quickly. When the saponification degree of P507 was 5%, the extraction rate reached to its maximum.When the saponification degrees were more than 5%, the physical and chemical properties of organic phase would changes, and that would lead to the organic membrane instability and the extraction rate of Er decreasing. The extraction rate of Er all decreased with the increases in initial pH values and initial concentrations of Er in aqueous feed solutions. This study can provide the theoretical and technical basis for the application of Y-type microchannel extraction technology in low-concentration heavy rare earths extraction.