REWAS 2013 pp 262-271 | Cite as

Modeling of synergistic effect of Cyanex 302 and D2EHPA on separation of nickel and cadmium from sulfate leach liquors of spent Ni-Cd batteries

  • Ehsan Vahidi
  • Ataollah Babakhani
  • Fereshteh Rashchi
  • Alireza Zakeri

Abstract

A model was developed to predict the synergistic effect of Cyanex 302 and D2EHPA on co-extraction and separation of nickel and cadmium from sulfate leach liquors of spent Ni-Cd batteries with the aim of increasing separation efficiency. The stoichiometric coefficient of cadmium was determined for sole D2EHPA and three different D2EHPA to Cyanex 302 ratios by applying the slope analysis method. The experimental data of cadmium extraction in pH range of 0.5–3, temperature of 25, 40 and 60 °C and various proportions of organic solvents (D2EHPA and Cyanex 302) were used to propose correlations of distribution coefficient of cadmium by multiple linear regression. The equation was found via multiple linear regression for the estimation of distribution coefficient of cadmium and the result showed that the proposed correlation is in good agreement with the experimental values. The extraction equilibrium constants, enthalpy change, and entropy change of the extraction reaction were also determined.

Keywords

Spent Batteries Solvent Extraction D2EHPA Cyanex 302 Nickel Cadmium 

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Copyright information

© TMS (The Minerals, Metals & Materials Society) 2013

Authors and Affiliations

  • Ehsan Vahidi
    • 1
  • Ataollah Babakhani
    • 2
  • Fereshteh Rashchi
    • 2
  • Alireza Zakeri
    • 3
  1. 1.Department of Civil and Environmental EngineeringUniversity of South FloridaTampaUSA
  2. 2.School of Metallurgy and Materials EngineeringUniversity College of Engineering, University of TehranTehranIran
  3. 3.School of Materials and Metallurgical EngineeringIran University of Science and TechnologyTehranIran

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