SEPARATION REAGENT OF PLATINUM GROUP METAL, METHOD FOR SEPARATING AND RECOVERING PLATINUM GROUP METAL, AND AMIDE-CONTAINING TERTIARY AMINE COMPOUND
申请人:NARITA Hirokazu
公开号:US20100095807A1
公开(公告)日:2010-04-22
The present invention provides a novel separation reagent capable of obtaining a high extraction % of rhodium in a chlorine-based acid solution, which has never existed heretofore, and a method for separating and recovering a platinum group metal using the same. An organic phase composed of an amide-containing tertiary amine separation reagent represented by the structural formula shown below is brought into contact with an acid solution containing a platinum group metal, thereby extracting rhodium, platinum and palladium with the organic phase. Among the metals extracted with the organic phase, rhodium is selectively back-extracted with a highly-concentrated hydrochloric acid solution, while palladium and platinum are back-extracted with a highly-concentrated nitric acid solution:
wherein at least one of R
1
, R
2
and R
3
represents an amide group represented by:
R
1
to R
3
other than the amide group and R
4
to R
6
represent a group selected from an optionally branched chain hydrocarbon group of 1 to 18 carbon atoms, an alicyclic hydrocarbon group of 1 to 10 carbon atoms, and an aromatic hydrocarbon group of 1 to 14 carbon atoms.
本发明提供了一种新型分离试剂,能够在含氯酸溶液中获得高萃取率的铑,此前从未存在过,以及使用该试剂分离和回收铂族金属的方法。将由下式表示的含酰胺的三级胺分离试剂组成的有机相与含铂族金属的酸性溶液接触,从而用有机相萃取铑、铂和钯。在从有机相中萃取的金属中,铑选择性地被高浓度盐酸溶液回萃,而钯和铂则被高浓度硝酸溶液回萃:其中,R1、R2和R3中的至少一个表示由下式表示的酰胺基:R1到R3除了酰胺基外,R4到R6表示选自1到18个碳原子的可选支链烃基、1到10个碳原子的脂环烃基和1到14个碳原子的芳香烃基的基团。