Kinetics of nickel leaching from spent catalyst in sulphuric acid solution |
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| Institution: | 1. Key Laboratory of Clean Chemical Processing Engineering of Shandong Province, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, Shandong, PR China;2. Department of Advanced Material Science & Engineering, Institute of Rare Metal, Mokpo National University, Channam 534-729, Republic of Korea |
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| Abstract: | The kinetics of spent nickel oxide catalyst (NiO/Al2O3) leaching in sulphuric acid solutions was investigated. The effects of sulphuric acid concentration, temperature, stirring speed, and particle size on the rate of nickel leaching were studied. In addition, the reaction residues at various levels of nickel extraction were examined by SEM, X-ray diffraction, electron microprobe, and chemical analysis. The results of the kinetic analysis of the leaching data for various experimental conditions indicated that the reaction is controlled by diffusion through the catalyst network with the activation energy of 16.6 ± 0.9 kJ/mol. A linear relationship between the rate constant and the inverse square of the initial particle diameter is also characteristic for a diffusion-controlled process. |
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