分光光度法研究汞(Ⅱ)与铈(Ⅲ)、镓(Ⅲ)、锆(Ⅳ)和铀(Ⅵ)的浮选分离

Study on Flotation Separation of Hg(Ⅱ) from Ce(Ⅲ),Ga(Ⅲ),Zr(Ⅳ) and U(Ⅵ) by Spectrophotometry

研究了碘化钾-四丁基溴化铵-水体系浮选分离汞(Ⅱ)的行为及与一些金属离子分离的条件。在水溶液中汞(Ⅱ)与四丁基溴化铵和碘化钾形成不溶于水的三元缔合物,此三元缔合物沉淀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6.0×10-4mol/L和5.0×10-3mol/L时,汞(Ⅱ)被定量浮选。而铈(Ⅲ)、镓(Ⅲ)、锆(Ⅳ)和铀(Ⅵ)在该体系中不被浮选,对合成水样进行分离和测定,效果良好。

The behavior and conditions for the flotation separation of Hg（ Ⅱ ） with tetrabutyl ammonium bromide-KI system from other metallic ions were investigated. Hg （ Ⅱ） combines with tetrabutyl ammonium bromide and KI into a ternary ion association precipitate [HgI4][-TBAB]2. The precipitate floated on the surface of water with a distinct boundary layer between liquid and solid phase. Hg （ Ⅱ ） could be quantitatively separated from Ce （ Ⅲ ）, Ga （ Ⅲ ） , Zr （ Ⅳ ） and U （ Ⅵ ） when tetrabutyl ammonium bromide and KI were 6. 0 × 10^-4mol/L and 5.0 × 10^-3mol/L, respectively. And it was used for the floatation separation and determination of Hg （ Ⅱ ） in the sample of synthetic water with floatation rate of Hg（ Ⅱ ） was higher than 99. 3% ,and other metallic ions is less than 1.7%. The method is practical for the separation and enrichment of trace mercury.