Study on floatation separation of palladium with KI-tetrabutyl ammonium bromide-water system
The behavior and conditions for the flotation separation of Pd(Ⅱ) from other metal ions were investigated with tetrabutyl ammonium bromide-KI system. The results showed that Pd(Ⅱ) combined with tetrabutyl ammonium bromide and KI into a ternary ion association precipitate [PdI_4][TBAB]_2 in the aqueous solutions, The precipitate was floated well on the surface of water phase to make the system to divide into both liquid and sold phases with a distinct boundary layer. Pd(Ⅱ) could be quantitatively separated from Ce(Ⅲ), Fe(Ⅱ), Sn(Ⅳ), Co(Ⅱ), Mn(Ⅱ), Rh(Ⅲ), Zn(Ⅱ), Ga(Ⅲ), Cr(Ⅲ), Mo(Ⅵ), W(Ⅵ), Ni(Ⅱ), Al(Ⅲ) and V(Ⅴ) by floatation, and the floatation efficiency of Pd(Ⅱ) was higher than 99.5% when the concentrations of tetrabutyl ammonium bromide and KI in clark-lubs buffer solution (pH 2) were 7.0×10~(-4) mol/L and 2.0×10~(-3) mol/L, respectively. The floatation separation and determination of Pd(Ⅱ) in the samples of synthetic water and Pd-Ni electroplating liquid were obtained satisfactory results. This method is easy and rapid, and it shows certain practical value in separation and enrichment analysis of trace palladium.
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