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Metals 2015, 5(4), 1812-1820;

Removal of Zn from Contaminated Sediment by FeCl3 in HCl Solution

Gas & Mining Plant Division, Samsung Construction & Technology, Seoul 137-956, Korea
Department of Energy & Resources Engineering, Korea Maritime and Ocean University (KMOU), Busan 606-791, Korea
Department of Mining Engineering and Metallurgical Engineering, Western Australian School of Mines, Curtin University, Kalgoorlie, WA 6430, Australia
Author to whom correspondence should be addressed.
Academic Editors: Suresh Bhargava, Mark Pownceby and Rahul Ram
Received: 28 July 2015 / Revised: 25 September 2015 / Accepted: 5 October 2015 / Published: 8 October 2015
(This article belongs to the Special Issue Hydrometallurgy)
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Harbor sediments contaminated with ZnS concentrate were treated by ferric chloride in HCl solution to remove Zn. The sediments were evaluated using Tessier’s sequential extraction method to determine the different metal phase associations of Zn. Leaching tests were performed to investigate the effects of experimental factors, such as agitation speed, ferric ion concentration, temperature, and pulp density, on the removal of Zn. The sequential extraction procedure revealed that about 17.7% of Zn in the sediment was associated with soluble carbonate and oxide phases. The results of the leaching tests indicated that higher ferric concentration and temperature increased the leaching efficiencies significantly, while the agitation speed has a negligible effect on the removal of Zn. The removal ratio increased to more than 99% within 120 min of treatment at 1 kmol·m−3 HCl solution with 1 kmol·m−3 Fe3+, 10% pulp density, and 400 rpm at 90 °C. The dissolution kinetics of Zn were discussed by comparing the two shrinking core models. It was determined that the kinetic data followed the diffusion controlled model well compared to the surface chemical reaction model. The activation energies were calculated to be 76.9 kJ/mol, 69.6 kJ/mol, and 58.5 kJ/mol for 0.25 kmol·m−3, 0.5 kmol·m−3, and 1 kmol·m−3 Fe3+, respectively. View Full-Text
Keywords: harbor sediments; ferric chloride; zinc sulfide; metal contamination harbor sediments; ferric chloride; zinc sulfide; metal contamination

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Lee, S.-H.; Kwon, O.; Yoo, K.; Alorro, R.D. Removal of Zn from Contaminated Sediment by FeCl3 in HCl Solution. Metals 2015, 5, 1812-1820.

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