Abstract： The paper presents a novel method for the flotation separation of copper using microcrystalline adsorption system of ammonium thiocyanate-tetradecyl trimethyl ammionium bromide.The effects of different parameters,such as the dosages of NH4SCN and tetradecyl trimethyl ammionium bromide (TTMAB) and acidity 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 showed that under the optimum conditions, tetradecyl trimethyl ammionium bromide cation (TTMAB+) reacted with SCN- to produce the microcrystalline matter (Ms-M) of (TTMAB+·SCN-). The water-insoluble ternary association complex of (TTMAB)2［Cu(SCN)4］ which produced by Cu2+ and SCN-,TTMAB+ was quantitatively adsorbed on the surface of Ms-M of (TTMAB+·SCN-) and floated above the water phase, the liquid-solid phases were formed with clear interface,while Fe3+，Co2+，Ni2+，Cd2+，Mn2+ 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 successfully applied to the flotation separation of trace Cu2+ in the samples of synthetic water,and the flotation yield was 93.4%-103.6%.
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