用MIBK萃取铂族金属离子与硫氰酸根络合物  

Extraction of Thiocyanate Complexes of Platinum Group Metals Ions by MIBK

作　　者：段文军[1] 容庆新[2] 陈若娜 

机构地区：[1]解放军广州医学高等专科学校 [2]中山大学化学系

出　　处：《贵金属》1998年第4期20-23,共4页Precious Metals

摘　　要：在一定酸度和温度条件下，用过量ＫＳＣＮ将铂族金属离子的氯络合物转变为硫氰酸络合物，最后调至≈３ｍｏｌ／ＬＨＣｌ酸度，用ＭＩＢＫ可将铂族金属离子的硫氰酸络合物（除Ｉｒ（Ⅳ）外）定量萃取（≥９５％）。Ｉｒ（Ⅳ）只有７４３％被萃取，在ＭＩＢＫ中加入少量叔胺（ＴＯＡ或Ｎ２３５）或氯化三正辛基甲基铵（９∶１体积比）则Ｉｒ（Ⅲ）的异配络合物萃取＞９８％。The extraction of thiocyanate complexes of platinum group metals ions by MIBK in HCl medium was investigated. At room temperature, only Pd(Ⅱ) ion forms complex with thiocyanate rapidly in 1～4mol/L HCl medium. The formation of the other five platinum group metals thiocyanate complexes requires heating on boiling water bath and at certain acid range. After complex formation, the solution is adjusted to 2～3mol/L HCl and extracted with MIBK. More than 95% of Pd(Ⅱ), Pt(Ⅳ), Rh(Ⅲ), Ru(Ⅲ) and Os(Ⅳ) ions are extracted, while Ir(Ⅳ) ion is reduced to Ir(Ⅲ) ion and only 74 3% is extracted. Small amounts (about 10%) of tertiary amine (as TOA, N 235 ) or quaternary ammonium salt (trioctylmethylammonium chloride) added to MIBK makes the extraction of Ir(Ⅲ) ion quantitative.

关 键 词：萃取 铂族金属 硫氰酸根络合物 MIBK 

分 类 号：TF830.323[冶金工程—有色金属冶金]