Abstract
The leaching behavior of nickel present in waste multi-layer ceramic capacitors (MLCC) was studied using different acidic leaching reagents in a stirred batch reactor. The waste MLCC consisted of multi-layered ceramic BaTiO 3 and inner nickel electrodes arranged like a sandwich. The effects of acid leaching reagent, its concentration, agitation speed, particle size, and leaching temperature on the leaching of nickel from waste MLCC were examined. HNO 3 was found to be most effective leaching reagent in comparison to HCl and H 2SO 4. The fraction of Ni leached was found to be 97% for a pulp density of 5 g/L and temperature 90 °C in an agitation time of 90 min. The leaching rate of nickel was limited by the diffusion of HNO 3 solution throughout thin channels that were formed between BaTiO 3 layers during the leaching of nickel. The Jander equation was also found to fit well with the leaching rate data. The leaching of nickel follows a first order rate reaction with HNO 3 concentration and has an activation energy of 37.6 kJ/mol (9.0 kcal/mol).
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