微乳液膜法萃取钕

EXTRACTION OF Nd^(3+) BY MICROEMULSION

进行了微乳液膜法萃取Nd3 +的研究 ,考察了不同盐酸浓度时微乳液的溶水量及其对Nd3 +的萃取率、内相富集浓度的影响 ,同时还考察了温度、料液浓度、缓冲剂对萃取Nd3 +的影响 .结果表明 ,随着盐酸浓度增大 ,微乳液溶水量增加 ;内相Nd3 +富集倍数最高为 2 4 3倍 ,料液Nd3 +浓度相同时 ,内相Nd3 +富集浓度和富集倍数随溶水量增加而减小 ,萃取率则变化不大 ,一般在 70 %～ 80 %范围 ,于料液中加入缓冲剂对Nd3 +的萃取率有很大影响 .根据微乳液膜渗透速率方程计算了传质系数 .通过在微乳液和料液之间加载一层亲水性微孔滤膜 ,避免了微乳液与料液直接接触所产生的乳化 。

For various HCl concentrations in the receiving phase,temperatures and Nd 3+ concentrations as well as addition of a buffer to the feed,Nd 3+ extraction by microemulsion liquid membrane was studied The results indicated that the water content in nonionic microemulsion increased with increasing HCl concentration On the contrary, the Nd 3+ enrichment concentration in the receiving phase decreased The highest enrichment of Nd 3+ concentration in the receiving phase was 24 3 times, and the extraction percentage was in the range of 70%～80% Adding a buffer in the feed showed a remarkable effect on Nd 3+ extraction Mass transfer coefficients were calculated according to the kinetics equation of microemulsion liquid membrane extraction A hydrophilic microporous filtraction membrane was used to isolate microemulsion and feed Accordingly, the emulsification caused by direct mixing of microemulsion with feed was avoided At the same time, severe leakage of hydrogen ion from the receiving phase was well controlled