Modeling of synergistic effect of Cyanex 302 and D2EHPA on separation of nickel and cadmium from sulfate leach liquors of spent Ni-Cd batteries
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.
KeywordsSpent Batteries Solvent Extraction D2EHPA Cyanex 302 Nickel Cadmium
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