KBr-乙醇-(NH_4)_2SO_4体系析相萃取分离和富集铱的研究  

Study on extraction separation and enrichment of iridium by ethanol-potassium bromide in the presence of ammonium sulphate

作　　者：翟秋阁[1] 司学芝[2] 马万山[1] 

机构地区：[1]信阳师范学院化学化工学院,信阳464000 [2]河南工业大学化学化工学院,郑州450052

出　　处：《分析试验室》2009年第12期55-58,共4页Chinese Journal of Analysis Laboratory

基　　金：河南省教育厅自然科学研究计划(2006150023)项目资助

摘　　要：研究了KBr-乙醇-(NH4)2SO4水体系析相萃取分离和富集铱的行为及与一些金属离子分离的条件。结果表明,(NH4)2SO4能使乙醇的水溶液分成两相,在分相过程中,Ir(Ⅳ)与KBr生成的IrBr62-与质子化乙醇(C2H5OH2+)形成的缔合物[IrBr62-][C2H5OH2+]2能被乙醇相完全萃取。当乙醇、KBr和(NH4)2SO4分别为体积分数30%、4.0×10-3mol/L、0.3 g/mL。pH3时,Ir(Ⅳ)的萃取率达到99.5%以上,Ga(Ⅲ),Al(Ⅲ),Cr(Ⅲ),Mo(Ⅵ),Fe(Ⅲ),Ni(Ⅱ),Zn(Ⅱ),Co(Ⅱ),Mn(Ⅱ),V(Ⅴ),Ag(Ⅰ),Ru(Ⅲ)和Rh(Ⅲ)基本不被萃取,实现了Ir(Ⅳ)与上述金属离子的分离。The behavior and conditions of extraction separation and concentration of iridium from other metal ions in ethanol-potassium bmmide-armnonium sulphate system were studied. The results showed that the ethanol-water solution could be well divided into two phases with the action of ammonium sulphate. C2H5 OH2^ ＋ is associated with [IrBr6^2- ] （form the combination of Ir（ IV ） and potassium bromide） to form a complex [ IrBr6^2- ] [C2H5 OH2^＋ ]2 which could be completely extracted during this process, and Ir （ IV ） could be quantitatively separated from Ga （ III ）, AI （III ）, Cr（m）, Mo（VI）, Fe（III）, Ni（II）, Zn（II）, Co（II）, Mn（II）, V（V）, Ag（I）, Ru（III） and Rh（III） byextraction. The extraction efficiency of Ir（ IV ） is higher than 99.5 % when the concentrations of ethanol, potassium bromide and ammonium sulphate in solution （pH 3） are 30% （V/V^-1）, 4.0× 10^-3 mol/L and 0.3 g/mL, respectively.

关 键 词：铱 乙醇 KBR 萃取分离 

分 类 号：O552.62[理学—热学与物质分子运动论]