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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/24033
Title: Reductive leaching of cobalt from zinc plant purification residues
Authors: Safarzadeh M.S.
Dhawan, Nikhil
Birinci M.
Moradkhani D.
Published in: Hydrometallurgy
Abstract: The leaching kinetics of the cobalt present in zinc plant purification residues (cobalt filtercakes) was investigated in the presence of the aromatic reducing agent - phenol - without any pretreatments. As such, the effects of particle size (- 75 + 53 to - 180 + 150 μm), reaction temperature (25 to 85 °C), phenol dosage (2 to15%) and sulfuric acid concentration (0.5 to 2.0 M) on the dissolution rate of cobalt and manganese were investigated. The experimental data conformed well to the shrinking core model, and the dissolution rate of cobalt was found to be controlled by diffusion through the product layer. Due to the low percentage of cobalt (< 1%) in the filtercake, SEM and XRD studies did not show any cobalt-containing phases. It was demonstrated that sulfuric acid with phenol addition can effectively dissolve cobalt and manganese present in the filtercake. The activation energy of the reaction was calculated as 22.92 kJ/mol. The order of the reaction with respect to H2SO4 concentration, particle size, and phenol dosage was found to be 0.61, - 1.88 and 0.70, respectively. The optimum conditions for the leaching of cobalt and manganese were found to be as 2.0 M H 2SO4, 85 °C, - 75 + 53 μm, and 10% phenol at the stirring speed of 600 rpm, which correspond to more than 97% cobalt and ~ 100% manganese recoveries. The rate of cobalt leaching based on shrinking core model can be expressed by a semi-empirical equation as:1-23X-(1-X)2/3=k0.[H2SO4]0. 61·r0-188.[phenol%]0.70.exp(-22.92RT)·t. © 2010 Elsevier B.V.
Citation: Hydrometallurgy, 106(44593): 51-57
URI: https://doi.org/10.1016/j.hydromet.2010.11.017
http://repository.iitr.ac.in/handle/123456789/24033
Issue Date: 2011
Keywords: Cobalt filtercake
Kinetics
Manganese
Phenol
Reductive leaching
Zinc
ISSN: 0304386X
Author Scopus IDs: 16246348700
25222833400
26434138200
22635378600
Author Affiliations: Safarzadeh, M.S., Laboratory for Leaching and Purification Processes, R and D Center, Iranian Zinc Mines Development Company (IZMDC), Zanjan, Iran, Research and Engineering Company for Non-ferrous Metals (RECO) under IZMDC, Zanjan, Iran
Dhawan, N., Department of Metallurgical Engineering, PEC University of Technology, Chandigarh-160012, India
Birinci, M., Mining Engineering Department, Faculty of Engineering, Inönü University, 44280 Malatya, Turkey
Moradkhani, D., Laboratory for Leaching and Purification Processes, R and D Center, Iranian Zinc Mines Development Company (IZMDC), Zanjan, Iran, Research and Engineering Company for Non-ferrous Metals (RECO) under IZMDC, Zanjan, Iran, Faculty of Engineering, Zanjan University, Zanjan, Iran
Corresponding Author: Safarzadeh, M. S.; Laboratory for Leaching and Purification Processes, , Zanjan, Iran; email: sadeghsafarzadeh@gmail.com
Appears in Collections:Journal Publications [MT]

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