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Kinetic Study of the Dissolution of Metallic Nickel in Sulphuric Acid Solutions in the Presence of Different Oxidants Bilczuk, Dario; Olvera, Oscar G.; Asselin, Edouard

Abstract

The dissolution of metallic nickel particles in sulphuric acid solutions has been studied in this work. The effect of temperature, sulphuric acid concentration, and oxidant type has been assessed. In the presence of hydrogen peroxide or dissolved oxygen the dissolution of nickel was fast. A shrinking particle model was used to fit the experimental data and estimate kinetic parameters. The apparent reaction rate constants calculated at 55°C when dissolved oxygen, ferric sulphate, and hydrogen peroxide were used as oxidants were, respectively, 0.17, 0.02, and 7.13 ms-₁. The dissolution of Ni in the presence of ferric sulphate occurred under surface chemical control, with an activation energy of 82.3 kJ/mol, while in the presence of hydrogen peroxide and dissolved oxygen the reaction seemed to have been mass transfer controlled. The dissolution of Ni in ferric sulphate solutions was also pH sensitive, possibly due to the formation of NiFe₂O-₄ or NiO that was prevented when sulphuric acid concentration was 1 mol/L. The dissolution rate in ferric sulphate-free solutions was affected negatively by temperature due to a decrease in O₂ solubility.

Item Metadata

Title
Kinetic Study of the Dissolution of Metallic Nickel in Sulphuric Acid Solutions in the Presence of Different Oxidants
Creator
Bilczuk, Dario; Olvera, Oscar G.; Asselin, Edouard
Publisher
Wiley
Date Issued
2016-06-29
Description
The dissolution of metallic nickel particles in sulphuric acid solutions has been studied in this work. The effect of temperature, sulphuric acid concentration, and oxidant type has been assessed. In the presence of hydrogen peroxide or dissolved oxygen the dissolution of nickel was fast. A shrinking particle model was used to fit the experimental data and estimate kinetic parameters. The apparent reaction rate constants calculated at 55°C when dissolved oxygen, ferric sulphate, and hydrogen peroxide were used as oxidants were, respectively, 0.17, 0.02, and 7.13 ms-₁. The dissolution of Ni in the presence of ferric sulphate occurred under surface chemical control, with an activation energy of 82.3 kJ/mol, while in the presence of hydrogen peroxide and dissolved oxygen the reaction seemed to have been mass transfer controlled. The dissolution of Ni in ferric sulphate solutions was also pH sensitive, possibly due to the formation of NiFe₂O-₄ or NiO that was prevented when sulphuric acid concentration was 1 mol/L. The dissolution rate in ferric sulphate-free solutions was affected negatively by temperature due to a decrease in O₂ solubility.
Subject
Ni dissolution; leaching; kinetic analysis
Genre
Article; Postprint
Type
Text
Language
eng
Date Available
2021-11-09
Provider
Vancouver : University of British Columbia Library
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International
DOI
10.14288/1.0403345
URI
http://hdl.handle.net/2429/80162
Affiliation
Applied Science, Faculty of; Materials Engineering, Department of
Citation
Bilczuk, D., Olvera, O.G. and Asselin, E. (2016), Kinetic study of the dissolution of metallic nickel in sulphuric acid solutions in the presence of different oxidants. Can. J. Chem. Eng., 94: 1872-1879.
Publisher DOI
10.1002/cjce.22576
Peer Review Status
Reviewed
Scholarly Level
Faculty; Postdoctoral
Rights URI
http://creativecommons.org/licenses/by-nc-nd/4.0/
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Attribution-NonCommercial-NoDerivatives 4.0 International