Abstract：The flotation separation behaviour of cadmium(Ⅱ) with microcrystalline adsorption system of ammonium sulfate-potassium iodide-dodecyl trimethyl ammonium chloride and the conditions for the quantitative separation of cadmium(Ⅱ) with other common metal ions were investigated. The results showed that, in presence of 0.5 g of (NH4)2SO4, Cd2+, KI and DTMAC in system could form ternary complex (DTMAC)2(CdI4) precipitation, which could be quantitatively adsorbed on the surface of DTMAC+·I- microcrystalline and floated above the salt-water phase. In this process, Cd2+ was quantitatively floated, while Co2+, Ni2+, Zn2+, Mn2+, Fe3+ and Al3+ remained in water phase, realizing the quantitative separation of Cd2+ from these ions. Consequently, a flotation separation method of Cd2+ with microcrystalline adsorption system was established. The generation of DTMAC+·I- microcrystalline was proved by scanning electron microscope images. The flotation separation mechanism of Cd2+ was discussed. The proposed method was successfully applied to the quantitative flotation separation of Cd2+ in synthetic water samples. The flotation yield was 95.4 %-105.3 %.
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