四丁基溴化铵-碘化钾-铟(Ⅲ)三元缔合物浮选分离铟的研究

Study on the floatation separation of indium with tetrabutyl ammonium bromide-potassium iodide-indium (Ⅲ) ternary complex

研究了四丁基溴化铵-碘化钾-铟(Ⅲ)三元缔合物浮选分离铟的行为及与一些金属离子分离的条件。结果表明,在水溶液中,In(Ⅲ)与四丁基溴化铵和KI形成不溶于水的三元缔合物InI4-.TBAB+,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pH值为2.0,四丁基溴化铵和KI的浓度分别为6.0×10-4mol/L和5.0×10-3mol/L时,In(可与Fe2+、Al3+、Mn2+、SnⅥ、Ni2+、Zn2+、Cr3+、VⅤ、WⅥ和Co2+定量分离,且In(Ⅲ)的浮选率达到99.1%以上。对合成水样中In(Ⅲ)进行分离和测定,效果良好。该方法不污染环境,在痕量铟的分离和富集分析中有很好的实用价值。

The behavior and conditions for the flotation separation of In （Ⅲ） from other metal ions were investigated with tetrabutyl ammonium bromide（TBAB）-potassium iodide-indium（Ⅲ） ternary complex. The results showed that In（Ⅲ） could combin with TBAB and KI into a ternary ion association precipi- tate （InI4 TBAB＋） in aqueous solution. The precipitate could float well on the surface of aqueous phase, making the system divide into liquid and solid phases with a distinct interface. In（Ⅲ） could be quantitatively floated and separated from Fe^2＋ , Al^3＋ , Mn^2＋ , Sn（Ⅳ）, Ni^2＋ , Zn^2＋ , Cr^3＋ , V（Ⅴ） , W（Ⅵ） and Co^2＋ with its floatation rate up to 99.1% when the concentrations of TBAB and KI in solution （pH 2.0） were 6.0X10 4 mol/Land 5.0×10^-3 mol/L, respectively. The proposed method has been applied to the separation and determination of indium （Ⅲ） in synthetic water samples with satisfactory results. This method was environment-friendly, and it showed fine practical value in the separation and enrichment analysis of trace indium.