Kinetic Analysis of Isothermal Leaching of Zinc from Zinc Plant Residue

Ali Reza Eivazi Hollagh; Eskandar Keshavarz Alamdari; Davooud Moradkhani; Ali Akbar Salardini

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Kinetic Analysis of Isothermal Leaching of Zinc from Zinc Plant Residue

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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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《有色冶金（英文）》 |2013年第1期|10-20|共11页
作者
Ali Reza Eivazi Hollagh; Eskandar Keshavarz Alamdari; Davooud Moradkhani; Ali Akbar Salardini;
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作者单位

Faculty of Engineering;

Zanjan University;

Zanjan;

Iran;

Materials and Energy Research Center;

Tehran;

Iran.;

Mining & Metallurgical Engineering;

Amirkabir University of Technology;

Tehran;

Iran;

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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原文格式 PDF
正文语种 chi
中图分类化学;
关键词
Zinc; Hydrometallurgy; Kinetic; Model; Zinc; Plant; Residue; Model-Free; Method;

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Kinetic Analysis of Isothermal Leaching of Zinc from Zinc Plant Residue

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