硝酸钾-碘化钾-溴化十六烷基吡啶微晶吸附体系浮选分离铜

研究了硝酸钾-碘化钾-溴化十六烷基吡啶微晶吸附体系浮选分离铜的新方法。考察了各种因素对Cu²⁺浮选率的影响,确定了浮选分离Cu²⁺的最佳条件,并讨论了Cu²⁺的浮选分离机理。结果表明,控制pH 3.0,在1.0 g KNO₃存在下,Cu²⁺与I^- 形成的CuI沉淀可被溴化十六烷基吡啶阳离子(CPB⁺)与I^-形成的微晶物质CPB⁺·I^-定量吸附,且被浮选至盐水相上形成界面清晰的固相,而Zn²⁺、Ni²⁺、Co²⁺、Mn²⁺、Fe²⁺、Al³⁺等不被浮选至固相,从而实现了Cu²⁺与这些离子的定量分离,并据此建立了微晶吸附体系浮选分离铜的新方法。方法用于环境水样中微量Cu²⁺的测定,回收率为95%～101%。

Flotation separation of copper using microcrystalline adsorption system of potassium nitrate-potassium iodide-cetyl pyrinium bromide

A novel method for the flotation separation of copper using microcrystalline adsorption system of potassium nitrate-potassium iodide-cetyl pyrinium bromide was studied. The effects of different factor on the flotation yield of Cu²⁺ have been investigated to select the experimental conditions. The possible flotation separation mechanism of Cu²⁺ was discussed. The results show that by controlling pH 3.0, in the presence of 1.0 g KNO₃, the CuI precipitation which formed by Cu²⁺ reacted with I^- was quantitatively adsorbed on the surface of the microcrystalline matter of (CPB⁺·I^-), which produced by cetyl pyrinium bromide cation(CPB⁺) and I^-, and was floated above the salt-water phase, the liquid-solid phases were formed with clear interface.While Zn²⁺,Ni²⁺,Co²⁺,Mn²⁺,Fe²⁺ and Al³⁺ could not be floated. The quantitatively separation of Cu²⁺ from those metal ions was achieved by flotation.A new method for the flotation separation of trace Cu²⁺ using microcrystalline adsorption system was established. The proposed method has been applied to the flotation separation and determination of trace Cu²⁺ in various environmental water samples,and the recovery was 95%-101%.