Extraction of palladium(Ⅱ) with OTMSO from acidic media  

作　　者：WUSongping MENGShuyuan GUGuobang ZHUANGZhiqiang 

机构地区：[1]CollegeofMaterialScienceandEngineering,SouthChinaUniversityofTechnology,Guangzhou510630,China [2]FenghuaAdvancedTechnology（Holding）Co.,Ltd,Zhaoqing526020,China

出　　处：《Rare Metals》2004年第2期97-102,共6页稀有金属（英文版）

摘　　要：The extraction of palladium(Ⅱ) from acidic media with cyclic sulfoxidedervva-tive-α-octyl-tetrahydrothiophene-1-oxide (OTMSO) was investigated. The extraction efficiencyof palla-dium(Ⅱ) with OTMSO is 97.1% at 0.3 mol·L^(-1) OTMSO. The plots of the extractionefficiency for palla-dium(Ⅲ) appear to lie on a convex curve having a minimum of extractionefficiency at 1-2 mol·L^(-1) HCl. The extraction reaction of palladium(Ⅱ) with OTMSO isendothermic, and ΔH_(OTMSO)~θ = 12.2 kJ·mol^(-1). The coordination number was studied with slopemethod. The result indicates that coordination number is 2. FT-IR spectra were used to analyze thestructure of complex and coordinated atom in complex. Pd is coordinated with both oxygen and sulfuratom in S=O group in OTMSO. The situation and intensity of peaks contributed by complex preparedfrom various acidity were different. The recovery of palladium(Ⅱ) with OTMSO from scrap containingpalladium was discussed. After silver and bismuth were removed, the feed solution was extractedthree times by 40% (volume fraction) OTMSO-kerosene. The loaded organic phase was scrubbed threetimes, and stripped three times by 2 mol·L^(-1) NH_3·H_2O solution. The total recovery ofpalladium was 99.8%, and the purity of palladium was 99.8 %.The extraction of palladium(Ⅱ) from acidic media with cyclic sulfoxidedervva-tive-α-octyl-tetrahydrothiophene-1-oxide (OTMSO) was investigated. The extraction efficiencyof palla-dium(Ⅱ) with OTMSO is 97.1% at 0.3 mol·L^(-1) OTMSO. The plots of the extractionefficiency for palla-dium(Ⅲ) appear to lie on a convex curve having a minimum of extractionefficiency at 1-2 mol·L^(-1) HCl. The extraction reaction of palladium(Ⅱ) with OTMSO isendothermic, and ΔH_(OTMSO)~θ = 12.2 kJ·mol^(-1). The coordination number was studied with slopemethod. The result indicates that coordination number is 2. FT-IR spectra were used to analyze thestructure of complex and coordinated atom in complex. Pd is coordinated with both oxygen and sulfuratom in S=O group in OTMSO. The situation and intensity of peaks contributed by complex preparedfrom various acidity were different. The recovery of palladium(Ⅱ) with OTMSO from scrap containingpalladium was discussed. After silver and bismuth were removed, the feed solution was extractedthree times by 40% (volume fraction) OTMSO-kerosene. The loaded organic phase was scrubbed threetimes, and stripped three times by 2 mol·L^(-1) NH_3·H_2O solution. The total recovery ofpalladium was 99.8%, and the purity of palladium was 99.8 %.

关 键 词：solvent extraction α-octyl-tetrahydrothiophene-1-oxide cyclic sulfoxide PALLADIUM 

分 类 号：TF845[冶金工程—有色金属冶金]