研究了Pd(Ⅱ)碘络合物在丙醇-硫酸铵双水相萃取体系中的分配行为,在HCl介质中,碘化铵存在下,Pd(Ⅱ)能形成离子缔合物[PdI42-.(PrOH2+)2]从而被萃入丙醇相.获得了最佳萃取条件,结果表明本方法能定量萃取Pd(Ⅱ),在最佳萃取条件下,Pd(Ⅱ)的萃取率可达99.2%.合成样的分离结果表明,本方法可应用于从大量基体金属如Fe2+、Ca2+、Mg2+、Mn2+、Al3+、Pb2+和Zn2+中分离Pd(Ⅱ).对从废碳钯催化剂中Pd的回收也进行了试验,结果与火试金法相符.
The extraction of iodide complex of Pd(Ⅱ) in the propyl-alcohol ammonium sulfate aqueous biphasic extraction system was investigated. Pd(Ⅱ) is found to be extracted into the propylmedium. And the related extraction conditions were optimized. The experimental results indicated that Pd(Ⅱ) can be quantitatively extracted by proposed method, and an extraction rate of 99.2% for Pd(Ⅱ) can be achieved under optimized conditions. The proposed method was applied to the separation of palladium from large amount of base metals such as Fe2+,Ca2+, Mg2+, Mn2+, Al3+, Pb2+and Zn2+ in synthetic sample. Application of the method for separation of palladium from spent carbon palladium catalysts was also investigated and the results agree well with fire-assay method.
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