Solvent Extraction of Mercury(II), Zinc(II) and Cadmium(II) from Hydrochloric Acid Solutions by Dihexyl Sulfoxide

Izumi ISHIKAWA*† and Taichi SATO††

Faculty of Engineering, Shizuoka University; Hamamatsu-shi 432-8561 Japan
† Present address: Fujikura Ltd.; 1-5-1 Kiba, Koutou-ku, Tokyo 135-8512 Japan
†† Present address: Department of Materials and Metallurgical Engineering, Queen's University; Kingston, Ontario K7L 3N6, Canada

Solvent extraction of mercury(II), zinc(II) and cadmium(II) from hydrochloric acid solutions by dihexyl sulfoxide(DHSO, R2SO) in benzene has been investigated under different conditions. The organic extracts were examined by infrared, Raman and NMR spectroscopies. As the results, the following equilibrium equations are proposed for the extraction of mercury(II), zinc(II) and cadmium(II) from hydrochloric acid solutions by DHSO: MCl2(a)+2R2SO(o)·MCl2·2R2SO(o), MCl3− (a)+ H+ (a)+ 3R2SO(o)·HMCl3·3R2SO(o), MCl42− (a)+ 2H+ (a)+2R2SO(o)· H2 MCl4·2R2SO(o), where M=Hg, Zn or Cd , in which (a) and (o) represent the aqueous and organic phases, respectively. In addition, when mercury loading increases, it is seen that the equilibrium consists of HgCl2(a)+ R2SO(o)·HgCl2·R2SO(o).


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