Abstract：The paper presents a novel method for the flotation separation of lead in microcrystalline adsorption system.The effects of different parameters,such as the dosages of KI and octadecyl trimethyl ammonium bromide (OTMAB),various salts and acidity etc on the flotation yield of Pb2+ have been investigated.The possible flotation separation mechanism of Pb2+ was discussed.The results showed that under the optimum conditions,octadecyl trimethyl ammonium bromide cation (OTMAB+) reacted with I- to produce the microcrystalline matter (MsM) of (OTMAB+·I-),the waterinsoluble ternary association complex of (OTMAB)2(PbI4) which was produced by Pb2+, I-, and then by OTMAB+ was quantitatively adsorbed on the surface of MsM of (OTMAB+·I-) and floated above the saltwater,while Fe3+，Co2+，Ni2+，Zn2+，Mn2+ and Al3+ could not be floated.The quantitatively separation of Pb2+ from those metal ions was achieved by flotation.A new method for the flotation separation of trace Pb2+ was established.The proposed method has been successfully applied to the determination of trace Pb2+ in the samles of synthetic water,and the flotation yield was 950%1052%.
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