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在文献中,我们对1969～1975年间发表的有关含氧、含硫、含磷及含氮萃取剂萃取铂族元素的问题作了综述,本文继续介绍双配位及多配位萃取剂。双配位和多配位萃取剂通常和被萃金属构成闭环络合物,虽然在某些情况下,它们也可象单配位萃取剂一样地参加反应。首先我们介绍一下含两个氧原子的萃取剂以及含有给电子性质的氧、硫和两个硫原子的萃取剂。文献研究了乙酰丙酮对铂、铱络合物的萃取,研究确定,只有在 pH 3～6范围内并在加热条件下才能生成铱的乙酰丙酮络合物,80℃时其萃取率为50～60％。萃取铱时,氯化物介质优于硫酸盐介质;但对于萃取铂来说,这两种介质并
In the literature, we review the extraction of platinum group elements from oxygen containing, sulfur, phosphorus and nitrogenous extractants published between 1969 and 1975. This article describes the bidentate and multi-complexing extractants. Bidentate and polyplexed extractants often form closed-chain complexes with the metal to be extracted, although in some cases they may also participate in the reaction as a single complex extractant. First we will introduce the extractant containing two oxygen atoms and the extractant containing oxygen, sulfur and two sulfur atoms of electronic nature. The literature studied the extraction of platinum and iridium complexes by acetylacetone. The study determined that the acetylacetone complex of iridium can be formed only under the condition of pH 3 ~ 6 under heating, the extraction rate is 80 ~ 60%. When iridium is extracted, the chloride media is superior to the sulfate media; however, for the extraction of platinum, these two media