氯化铵-硫氰酸铵-十二烷基三甲基溴化铵-水体系浮选分离汞(Ⅱ)

Separation of Mercury(Ⅱ) by Floatation from Aqueous Solution Containg Ammonium Chloride Ammonium Thiocyanate and Dodecyltrimethyl Ammonium Bromide

结果表明：在1．0g氯化铵存在下，当0．1mol·L^-1硫氰酸铵溶液和1．0×10^-3mol·L^-1十二烷基三甲基溴化铵（DTAB）溶液的用量分别为0．5，1．0mL时，且溶液的总体为10mL，硫氰酸铵-DTAB-汞（Ⅱ）三元缔合物可浮于盐水相上形成界面清晰的两相，从而使汞（Ⅱ）被定量浮选，而Zn^2＋，Mn^2＋，Ni^2＋，Co^2＋，Cu^2＋，Cd^2＋等离子在此体系中不被浮选，实现了汞（Ⅱ）与这些常见离子之间的定量分离，对合成水样中微量汞（Ⅱ）进行定量浮选分离测定，浮选率为98．29／5～102．0％。

It was found that a sparingly solubie ternary association compound, Hg（ Ⅱ）-NH4SCN-DTAB, was formed in an aqueous solution, containing 1.0 g of NH4Cl, 0.5 mL of 0.1 mmol · L ： NH4SCN solution and 1.0 mL of 1×10^-3mol · L^-1 dodeeyltrimethyl ammonium bromide （DTAB） solution, in a total volume of 10 mL. The ternary complex was floated above the surface of the aqueous salt phase forming a clear cut between the two phases. It was also found that under the condition mentioned above quantitaitve separation of Hg（ Ⅱ ） was attained, while none of the metal ions, Zn^2＋ , Mn^2＋, Ni^2＋ , Co^2＋ , Cu^2＋ and Cd^2＋ , was floated under the same condition. As shown by experimental results, the rate of floatation of Hg（ Ⅱ ） from solutions in the presence of the metal ions mentioned above was found in the range of 98. 2%-102. 0%.