Publication: Kinetics of the dissolution of ilmenite in oxalic and sulfuric acid solutions
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Issued Date
2014-01-01
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19322143
19322135
19322135
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2-s2.0-84894254253
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Mahidol University
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SCOPUS
Bibliographic Citation
Asia-Pacific Journal of Chemical Engineering. Vol.9, No.1 (2014), 24-30
Suggested Citation
Woranart Jonglertjunya, Santita Rattanaphan, Pitchayawadee Tipsak Kinetics of the dissolution of ilmenite in oxalic and sulfuric acid solutions. Asia-Pacific Journal of Chemical Engineering. Vol.9, No.1 (2014), 24-30. doi:10.1002/apj.1742 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/33582
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Title
Kinetics of the dissolution of ilmenite in oxalic and sulfuric acid solutions
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Abstract
In this study, the effects of particle size, type and concentration of acid solution on dissolution kinetics of ilmenite are investigated. The results showed that both oxalic and sulfuric acid and their concentrations had relatively high effects on the dissolution rate of titanium, which increased with an increase in acid concentration. About 86.4% of titanium could be leached in 10 h when using 4 M oxalic acid, 1: 20 solid/liquid ratio, 90 °C temperature and particle size less than 45 μm. Under similar experimental conditions with the exception of sulfuric acid concentrations of 4, 8 and 12 M, the titanium solubilization was 16.1%, 48.2% and 52.0%, respectively. The experimental data followed reaction kinetics and indicated that the shrinking particle model controlled the chemical reaction. The observed titanium dissolution rates could be expressed as 1 - (1 - x)1/3 = 0.0092C 1.2022t for oxalic acid for concentration varying between 1 and 4 M and 1 - (1 - x)1/3 = 0.0006C1.5977t for sulfuric acid for concentration varying between 2 and 12 M, respectively. The fitted models for estimating the titanium dissolution rate from the experimental data indicated good accuracy with coefficient of determination (R2) higher than 0.96. © 2013 Curtin University of Technology and John Wiley & Sons, Ltd.