Choi, Seo-Young and Nguyen, Viet Tu and Lee, Jae-chun and Kang, Ho and Pandey, B D (2014) Liquid–liquid extraction of Cd(II) from pure and Ni/Cd acidic chloride media using Cyanex 921: A selective treatment of hazardous leachate of spent Ni–Cd batteries. Journal of Hazardous Materials, 278 (IF-4.331). pp. 258-266.
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The present paper is focused on solvent extraction of hazardous Cd(II) from acidic chloride media by Cyanex 921, a new extractant mixed with 10% (v/v) TBP in xylene. The optimum conditions for extraction and stripping of Cd(II) were investigated with an aqueous feed of 0.1 mol/L Cd(II) in 2.0 mol/L HCl. McCabe–Thiele diagram was in good agreement with the simulation studies, showing the quantitative extraction (99.9%) of Cd(II) within two counter-current stages utilizing 0.30 mol/L Cyanex 921 at O/A ratio of 3/2 in 10 min. Stoichiometry of the complexes extracted was determined and confirmed by numerical treatment and graphical method, revealing the formation of HCdCl3·2L and HCdCl3·4L for Cyanex 921(L) concentration in the range 0.03–0.1 mol/L and 0.1–1.0 mol/L, respectively. The thermodynamic parameters for the extraction of cadmium were also determined. The stripping efficiency of cadmium from the loaded organic with 0.10 mol/L HCl was 99.6% in a three-stage counter-current process at an O/A ratio of 2/3. Cyanex 921 was successfully applied for the separation of Cd(II) from Ni(II) in the simulated leach liquor of spent Ni–Cd batteries. The study demonstrates the applicability of the present hydrometallurgical approach for the treatment of hazardous waste, the spent Ni–Cd batteries.
|Uncontrolled Keywords:||Solvent extraction;Divalent cadmium;Cyanex 921;Ni–Cd batteries; Recycling|
|Divisions:||Metal Extraction and Forming|
|Deposited By:||Dr. A K Sahu|
|Deposited On:||04 Jul 2014 10:25|
|Last Modified:||04 May 2016 13:07|
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