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本文研究了氮化2-乙基已基膦酸单2-乙基已基酯(简称 P_(507))-磺化煤油——HCl 体系萃取重稀土元素(D_y、H_o、E_r,T_m、Y_b、L_u)的分配规律.在氨化 P_(507)-K_(ero)-HCl 体系中,随着水相酸度的变化,萃取机理亦发生变化.低酸度时为酸性萃取剂的阳离子交换萃取机理;高酸度时为中性溶剂化物萃取机理,并从有相的红外光谱得到了证实.从本实验条件看,P_(507)的氨化对萃取分离重稀土元素的影响,比对萃取分离钕—钐的影响小.
In this paper, the extraction of heavy rare earth elements (D_y, H_o, E_r, T_m, Y_b (superscript 2 +)) from nitrated 2-ethylhexyl phosphonic acid mono- , L_u) .In the ammoniated P_ (507) -K_ (ero) -HCl system, the extraction mechanism also changed with the change of acidity of aqueous phase.Cation exchange extraction mechanism of acidic extractant at low acidity ; When the acidity is high, the neutral solvate extraction mechanism is confirmed, and it is confirmed from the phase infrared spectrum. From the experimental conditions, the influence of P_ (507) amination on extraction and separation of heavy rare earth elements is better than that of extraction and separation of neodymium - The impact of samarium is small.