【摘要】 ２－乙基己基膦酸单２－乙基己基酯（ＨＥＨ／ＥＨＰ，ＨＬ）是广泛用于稀土分离湿法冶金的有效萃取剂［１～３］．未氨化的ＨＥＨ／ＥＨＰ在中空纤维膜（ＨＦＭ）中萃取稀土元素的机理和控制模式已有报道［４，５］，但未氨化的ＨＥＨ／ＥＨＰ对轻、中稀土的萃取能力较弱...更多还原

【Abstract】 The membranes of polyvinylidene fluoride, which were synthesized by our laboratory, were used to study the transfer and extraction performances of Nd(Ⅲ) and Sm(Ⅲ) with the extraction system of HEH/EHP kerosene. The results show that the membrane material was suitable to the study on membrane extraction, and could offer a good transfer performance in the membrane construction parameters selected. The extraction reaction in the membrane module was the same as that in liquid liquid process. HEH/EHP ammoniated for increasing the mass transfer coefficient was almost the same with increasing the concentration of HEH/EHP, and H + was still transferred first at higher pH range of feed solution when HEH/EHP was ammoniated. The controlling model of the membrane extraction process was the diffusion model accompanied by interfacial reaction. The controlling function of interfacial reaction would increase gradually with the increasing of the membrane pore size. The mass transfer coefficient increased when extraction and stripping were carried out simultaneously.更多还原