硝酸钠-碘化钾-十八烷基三甲基氯化铵体系浮选分离铅(Ⅱ)

Flotation separation of lead(Ⅱ) by sodium nitrate-potassium iodideoctadecyl trimethyl ammonium chloride system

研究了硝酸钠-碘化钾-十八烷基三甲基氯化铵体系浮选分离铅（Ⅱ）的行为及其与常见离子分离的条件。结果表明,在0.5g硝酸钠存在下,当0.1 mol/L碘化钾溶液和0.03mol/L十八烷基三甲基氯化铵（OTMAC）溶液的用量均为2.00mL时,体系中的Pb2＋以（OTMAC）2（PbI4）沉淀形式被浮选至盐水相上形成浮选固相而被定量浮选,而Co^2＋、Zn^2＋、Mn^2＋、Ni^2＋、Al^3＋和Fe2＋仍然留在盐水相,实现了Pb2＋与这些离子的定量分离。实验方法对合成水样中微量Pb2＋的定量浮选率为99.6%~102.3%。

The flotation separation behaviour of lead（Ⅱ） by sodium nitrate-potassium iodide-octadecyl trime- thyl ammonium chloride system and the separation conditions for lead （Ⅱ） with other metal ions were stud- ied. The results showed that in the presence of 0.5 g NaNOa, when the amounts of 0.1 mol/L KI solution and 0.03 mol/L octadecyl trimethyl ammonium chloride（OTMAC） were both 2.00 mL, the water-insolu- ble ternary association complex of （OTMAC）2 （Phi4） formed from system floated above the salt-water and formed solid phase with clear interface, thus Pb2＋ could be floated quantitatively. In this condition, Co^2＋ , Zn^2＋ ,Mn^2＋ ,Ni^2＋ ,Al^3＋ ,Fe^2＋ could not be floated. The quantitatively separation of Pb^2＋ from those metal ions was achieved by flotation. The proposed method has been used for the quantitative flotation separation of trace Pb^2＋ in the samples of synthetic water with the flotation yield of lead of 99.6%-102.3%.