Sulfuric acid leaching kinetics of South African chromite

A1 Journal article (refereed)


Internal Authors/Editors


Publication Details

List of Authors: Qing Zhao, Cheng-jun Liu, Pei-yang Shi, Bo Zhang, Mao-fa Jiang, Qing-song Zhang, Ron Zevenhoven, Henrik Saxén
Publisher: Springer
Publication year: 2015
Journal: International Journal of Minerals, Metallurgy and Materials
Journal acronym: INT J MIN MET MATER
Volume number: 22
Issue number: 3
Start page: 233
End page: 240
eISSN: 1869-103X


Abstract

The sulfuric acid leaching kinetics of South African chromite was investigated. The negative influence of a solid product layer constituted of a silicon-rich phase and chromium-rich sulfate was eliminated by crushing the chromite and by selecting proper leaching conditions. The dimensionless change in specific surface area and the conversion rate of the chromite were observed to exhibit a proportional relationship. A modified shrinking particle model was developed to account for the change in reactive surface area, and the model was fitted to experimental data. The resulting model was observed to describe experimental findings very well. Kinetics analysis revealed that the leaching process is controlled by a chemical reaction under the employed experimental conditions and the activation energy of the reaction is 48 kJ·mol−1.


Keywords

chromite ore treatment, leaching kinetics, physical models, sulfuric acid

Last updated on 2020-19-01 at 02:54