碘化钾 四丁基溴化铵 水体系浮选分离铱的研究

研究了碘化钾 四丁基溴化铵 水体系分离Ir的行为及Ir与其他金属离子分离的条件。实验结果表明, 在水溶液中, Ir与四丁基溴化铵(TBAB)和碘化钾形成不溶于水的三元缔合物［IrI6］［TBAB］2，此三元缔合物浮于水相上层形成界面清晰的液 固两相。当溶液中四丁基溴化铵和碘化钾的浓度分别为8.0×10-4 mol/L和6.0×10-3 mol/L, Ir的浮选率达到97.6 %，而Rh、 W、 V、 Ce、 Sn、 Mo、 U、 Ga、 Cr、 Mn、 Al、 Fe、 Zn、 Co和Ni离子在该体系中不被浮选，实现了Ir与这些金属离子的定量分离。Bi、Sb 和Hg在该体系中有很高的浮选率，Pb和Cu与KI反应生成不溶于水的PbI2和 CuI，所以Ir不能和Pb,Cu,Bi,Sb 和Hg分离。对合成水样进行分离，效果较好。

Study on floatation separation of iridium in potassium iodide-tetrabutyl ammonium bromide-water system

The separation behaviors and conditions of iridium from other metal ions were studied in potassium iodide tetrabutyl ammonium bromide water system. The results showed that Ir could form water insoluble ternary complex (［IrI6］［TBAB］2) with tetrabutyl ammonium bromide and potassium iodide in aqueous solution. This ternary complex floated on water phase, and the liquid solid two phase was formed with clear interface. When the concentrations of tetrabutyl ammonium bromide and potassium iodide were 8.0×10-4 mol/L and 6.0×10-3 mol/L, the flotation rate of Ir was up to 97.6 %. Meanwhile, Rh, W, V, Ce, Sn, Mo, U, Ga, Cr, Mn, Al, Fe, Zn, Co and Ni were not floated in this system, realizing the quantitative separation of Ir from these metal ions. Bi, Sb and Hg had high flotation rate in this system. Pb and Cu could react with KI to form water insoluble PbI2 and CuI, so Ir could not be separated from Pb, Cu, Bi, Sb and Hg. The synthetic water sample was separated by this method with satisfactory results.