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机构地区:[1]信阳师范学院化学化工学院,河南信阳464000 [2]新乡学院化学系,河南新乡453003
出 处:《冶金分析》2008年第10期74-77,共4页Metallurgical Analysis
基 金:河南省教育厅自然科学研究计划项目(2006150023)
摘 要:研究了溴化四丁基铵-溴化钾体系分离Pd(Ⅱ)的行为及与其他金属离子分离的条件。结果表明,在水溶液中,Pd(Ⅱ)与溴化钾和溴化四丁基铵形成不溶于水的三元缔合物PdBr^24-·2TBAB^+,此三元缔合物沉淀浮于盐水相上层形成界面清晰的液-固两相。当溶液中溴化钾、溴化四丁基铵的浓度分别为1.5×10^-2mol/L和2.0×10^-3mol/L,pH 2.0时,Pd(Ⅱ)的浮选率达到99.5%以上。而Pt(Ⅳ),Ru(Ⅲ),Fe(Ⅲ),Rh(Ⅲ),Al(Ⅲ),Cd(Ⅱ),Co(Ⅱ),Hg(Ⅱ),Mn(Ⅱ),Pb(Ⅱ),Zn(Ⅱ),Ni(Ⅱ),Cr(Ⅲ),W(Ⅵ)和V(Ⅴ)在该体系中不被浮选,实现了Pd(Ⅱ)与这些金属离子的定量分离。方法用于合成水样中Pd(Ⅱ)的分离,浮选率为99.5%-100.0%。The behavior and conditions for the floatation separation of Pd(ID from other tnetal ions were investigated with tetrabutyl ammonium bromide-potassium bromide system. The results showed that Pd(Ⅱ) combines with potassium bromide and tetrabutyl ammonium bromide into a ternary ion association precipitate PdBr^24-·2TBAB^+ in the aqueous solutions. The precipitate was floated well on the surface of salt water phase to make the system to divide into liquid and sold phases with a distinct boundary layer. Pd(Ⅱ) could be quantitatively separated from Pt(Ⅳ),Ru(Ⅲ),Fe(Ⅲ),Rh(Ⅲ),Al(Ⅲ),Cd(Ⅱ),Co(Ⅱ),Hg(Ⅱ),Mn(Ⅱ),Pb(Ⅱ),Zn(Ⅱ),Ni(Ⅱ),Cr(Ⅲ),W(Ⅵ)and V(Ⅴ) by floatation. And the floatation yield of Pd(Ⅱ) was higher than 99.5 M when the concentrations of potassium bromide and tetrabutyl ammonium bromide in solution are 1.5×10^-2mol/L and 2.0×10^-3mol/L respectively at pH 2.0. The proposed method has been applied for the separation of Pd(Ⅱ) in synthetic water samples with the floatation yield of 99.5%-100.0%.
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