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本文研究了三正辛胺(TOA)异辛烷溶液从HCI介质中萃取Rh(Ⅲ),Ir(Ⅲ)水合阳离子,及铂族金属氯合阴离子的性能,建立了一种用TOA溶液从它们的混合液中分离和提纯Ir的新方法。 含Pt,Pd, Rh,Ir的混合液经水解、酸化等处理后,其中Rh,Ir分别转变为Rh(Ⅲ),Ir(Ⅲ)水合阳离子,Pt,Pd仍保持在氯合阴离子状态,用TOA溶液可萃取99％的的Pt,Pd,而Rh,Ir定量留在水相。进而将Ir转变为IrCI_6~2,Rh仍保持为Rh(Ⅲ)水合阳离子,再用TOA液溶萃取,即实现Ir与Rh分离。用此法从工业料液中制备的Ir,其纯度达99.95％。
In this paper, the properties of Rh (Ⅲ), Ir (Ⅲ) hydrated cation and platinum group metal chloride anions extracted from HCI medium by three-octylamine (TOA) isooctane solution were studied. A new method for the separation and purification of Ir. Rh, Ir were transformed into Rh (Ⅲ) and Ir (Ⅲ) hydrated cations respectively, while Pt and Pd were still kept in the chloride anion state after the mixture containing Pt, Pd, Rh and Ir was hydrolyzed and acidified. TOA solution can extract 99% of Pt, Pd, and Rh, Ir quantitative retention in the aqueous phase. Ir is converted into IrCI_6 ~ 2, Rh remains as Rh (Ⅲ) hydrated cation, and then TOA solution is used for solution extraction. Ir prepared by this method from the industrial liquid, its purity of 99.95%.