Abstract
Herein, an environmentally friendly and selective leaching process of Cd, from spent Ni-Cd battery, is reported by the use of alkaline glycine solution. The pertinent parameters affecting Cd leaching levels, including the concentration of glycine (0.5–1.5 mol/L), pH (8–11), temperature (25–75 °C), and time (30–150 min) were statistically investigated via response surface methodology coupled with central composite design. The results showed that the level of Ni in the leaching solution is negligible, especially at the leaching time shorter than 150 min, while Cd leaching percentage can reach higher than 80%, confirming the selectivity of the process. In addition, glycine concentration and time are the most significant parameters, and for achieving a Cd leaching percentage higher than 80%, the level of glycine should be at least 1 mol/L. It was attempted to understand the statistically significant interactions among the factors affecting the Cd leaching process based on a comprehensive thermodynamic discussion. Finally, Cd was successfully precipitated in the form of CdS nanoparticles (~20 nm) by the addition of Na2S solution into the obtained leaching solution.
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