【摘要】 提出了从 Pt,Pd,Rh 和 Ir 的混合物中纯化 Rh 的 P₅₃₈萃取法.首先将 Rh（Ⅲ）转化为水合阳离子,然后用 P₅₃₈的煤油溶液将其萃取到有机相,仍处于阴离子状态的 Pt,Pd 和 Ir 则留在水相.一次萃取 Rh 的直收率可达95%以上,Pt,Pd 和 Ir 的萃取率在1%以下.更多还原

【Abstract】 A solvent extraction process for the purification of Rh from mixtures containingPt,Pd,Rh and Ir has been developed.The mixtures were first boiled with HCl to convertpolynuclear complexes to monomeric.Ir（Ⅳ）was reduced to Ir（Ⅲ）with hydroquinoneafter cooling.The pH was brought to 11～12 with NaOH.The solutions were maintainedat this pH and 35℃ for 30 min,and then acidified to pH 1.2～1.5 with HCl.Chlorinewas passed though the solutions to restore Ir（Ⅲ）to Ir（Ⅳ）.The hydrated cationic Rh（Ⅲ）species thus Prepared were extracted to partially saponified P₅₃₈（a mixture ofmonoalkyl phosphates）-HDEHP-kerosine solutions in volume ratio of 2:5:15,while Pt,Pd and Ir were left in the aqueous phases as complex anionic species.Rh（Ⅲ）was finallyback-extracted with 1～6M HCl.The experimental results showed that the directrecovery of Rh was higher than 95% and the amounts of Pt,Pd and Ir extracted wereless than 1% for a single-stage extraction.更多还原