【摘要】 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IrCI₆²,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％。更多还原

【Abstract】 The extraction of aqua-cations Rh(Ⅲ) and Ir(Ⅲ) from HCl medium ultilizing trioctylamine in a isooctane diluent as the extracting agent, and the relevant species PtCl62-, PdCl42-, IrCl63-, IrCli62- and RhCl63- have been investigated; a new efficient method to separate Ir in high purity from a mixture solution of Pt, Pd, Rh, Ir has been developed.After hydrolysis and acidification of a mixture solution containing Pt, Pd, Rh, Ir, rhodinm and iridium turned to aqua-cations of Rh(Ⅲ) and Ir(Ⅲ), whereas Pt and Pd changed to PtCl52- and PdCl42- respectively. While it was extracted by TOA solution, more than 99% of Pt and Pd went into organic phase, on the other hand Rh and Ir remained in aqueous phase. Through the subsequent regulation of the chemical state of Ir, 95% of which could be extracted by TOA solution in the form of species IrCl62-, as Rh(Ⅲ) still quantitively remained in the aqueous phase. Then, 99.95% of Ir in organic phase could be backextracted by Na2CO, or NaOH solution.In examination of this method with the real solution sampled from an industrial process, it was found that the purity of Ir recovered via this procedure could reach 99.95%.更多还原