Abstract：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%.
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