摘要
采用Y型微通道萃取技术萃取水溶液中的稀土铒,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50 cm、直径0.6 mm、停留时间为2.12 s时,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。原因是皂化度大于5%时,有机相理化性质的变化会导致有机薄膜失稳乳化,降低了萃取效率。随水相初始pH值和初始铒浓度的增加,铒的萃取率均减小。研究结果可为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。
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 indicate that the microchannel sizes have important influences on the extraction rate of Er.The longer the length of microchannel is,the higher the extraction rate is.The smaller the diameter of microchannel is,the higher the extraction rate is.When the length of the microchannel is 50 cm,the diameter of the microchannel is 0.6 mm and the residence time is 2.12 s,the extraction rate of Er is high as 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 increased firstly and then decreased quickly.When the saponification degree of P507 was 5%,the extraction rate reached to its optimal.When the saponification degrees were more than 5%,the physical and chemical properties of organic phase may changes,and that would result instability of the organic membrane and the decreasing Er extraction rate.The extraction rate of Er all decreased with the increases in initial pH values and initial concentrations of Er in aqueous feed solutions.The study can provide a theoretical and technical basis for the application of Y-type microchannel extraction technology in low-concentration heavy rare earths extraction.
作者
黎署阳
刘杰
李金成
吴晓红
李晓丽
孙梦宪
张璐雯
王彪
黄焜
LI Shuyang;LIU Jie;LI Jincheng;WU Xiaohong;LI Xiaoli;SUN Mengxian;ZHANG Luwen;WANG Biao;HUANG Kun(School of Environmental and Municipal Engineering,Qingdao University of Technology,Qingdao 266520,China;CAS Key Laboratory of Bio-based Materials,Qingdao Institute of Bioenergy and Bioprocess Technology,Chinese Academy of Sciences,Qingdao 266100,China;School of Metallurgical and Ecological Engineering,University of Science&Technology Beijing,Beijing 100083,China)
出处
《有色金属工程》
CAS
北大核心
2020年第7期53-60,共8页
Nonferrous Metals Engineering
基金
国家自然科学基金资助项目(51574213,21606248)
山东省重点研发计划项目(2018GSF117028)
省级大学生创新创业训练计划项目(S201910429015)。
关键词
Y型微通道反应器
稀土
萃取
铒
Y-type microchannel reactor
rare earth
extraction
Er
