Kinetic Analysis of Isothermal Leaching of Zinc from Zinc Plant Residue — Oak Academic Publishing
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Kinetic Analysis of Isothermal Leaching of Zinc from Zinc Plant Residue
Mining & Metallurgical Engineering, Amirkabir University of Technology, Tehran, Iran
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Mining & Metallurgical Engineering, Amirkabir University of Technology, Tehran, Iran&Research Center for Materials and Mining Industries Technology, Amirkabir University of Technology, Tehran, Iran
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Faculty of Engineering, Zanjan University, Zanjan, Iran
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Materials and Energy Research Center, Tehran, Iran.
1 Mining & Metallurgical Engineering, Amirkabir University of Technology, Tehran, Iran
2 Mining & Metallurgical Engineering, Amirkabir University of Technology, Tehran, Iran&Research Center for Materials and Mining Industries Technology, Amirkabir University of Technology, Tehran, Iran
3 Faculty of Engineering, Zanjan University, Zanjan, Iran
4 Materials and Energy Research Center, Tehran, Iran.
The sulfuric acid leaching of zinc plant residues was studied in an attempt to find a suitable hydrometallurgical method for zinc recovery. The parameters evaluated consist of reaction time, Solid-to-liquid-ratio, reaction temperature, agitation rate and pH. The results of kinetic analysis of the leaching data under various experimental conditions indicated that there is a reaction controlled by the solution transport of protons through the porous product layer with activation energy of about 1 kJ/mol for different constant solid to liquid ratios. Based on the shrinking core model (SCM), the following semiempirical rate equation was established: 1-3(1-a)2/3+2(1-a)=0.001187×[H + ] 0.016 ×[(S/L)] - 1.34 ×exp(-1/RT) × t . On the other hand, activation energy was obtained from a model-free method using isothermal measurements. Values for activation energy were calculated as a result of the conversion function with an average of 2.9 kJ/mol. This value is close to that determined previously, using shrinking core model (SCM).
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