Abstract
Recycling processes for the recovery of metallic content from the electronic wastes are environmentally friendly and economical. This paper reports a method for the recovery and separation of Ni and Co from the sulfate solution by the use of D2EHPA. In this regard, the influence of citrate ion, as a carboxylate ligand, was examined in the separation conditions of Ni and Co via D2EHPA (a poor selective extractant for Ni and Co separation). It was found that the \( \Delta {\text{pH}}_{0.5}^{\text{Ni-Co}} \) (the difference between pH values corresponding to 50 pct extraction of metallic ion) increases to 1.5 at the citrate concentration of 0.05 M; this \( \Delta {\text{pH}}_{0.5}^{\text{Ni-Co}} \) value is much higher than that obtained in the absence of citrate ion (0.1). Fourier Transform Infrared Spectroscopy (FT-IR) indicated that the citrate ion is co-absorbed during the metallic ions absorption by D2EHPA meaning that the metal–organic complexes contain Co/Ni and citrate ion. Also, the stoichiometric coefficients of the Ni and Co extraction reaction were proposed by applying the slope analysis method.
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Nadimi, H., Haghshenas Fatmehsari, D. & Firoozi, S. Separation of Ni and Co by D2EHPA in the Presence of Citrate Ion. Metall Mater Trans B 48, 2751–2758 (2017). https://doi.org/10.1007/s11663-017-1008-7
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DOI: https://doi.org/10.1007/s11663-017-1008-7