University of Oulu

Tian, C., Zhou, J., Ren, C., Omran, M., Zhang, F., & Tang, J. (2023). Drying Kinetics of Microwave-Assisted Drying of Leaching Residues from Hydrometallurgy of Zinc. Materials, 16(16), 5546.

Drying kinetics of microwave-assisted drying of leaching residues from hydrometallurgy of zinc

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Author: Tian, Chunlan1; Zhou, Ju1; Ren, Chunxiao1;
Organizations: 1Kunming Key Laboratory of Energy Materials Chemistry, Yunnan Minzu University, Kunming 650500, China
2Faculty of Technology, University of Oulu, 90570 Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 13.2 MB)
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Language: English
Published: Multidisciplinary Digital Publishing Institute, 2023
Publish Date: 2023-08-29


In the hydrometallurgical process of zinc production, the residue from the leaching stage is an important intermediate product and is treated in a Waelz kiln to recover valuable metals. To ensure optimal results during the Waelz kiln process, it is necessary to pre-treat the residues by drying them first due to their higher water content. This work studies the residue’s drying process using microwave technology. The study results indicate that microwave technology better removes the residue’s oxygen functional groups and moisture. The dehydration process’s effective diffusion coefficient increases as the microwave’s heating power, the initial moisture content, and the initial mass increase. The Page model is appropriate for imitating the drying process, and the activation energy of the drying process for the residues is −13.11217 g/W. These results indicate that microwave technology efficiently dries the residues from the leaching stage. Furthermore, this study provides a theoretical basis and experimental data for the industrial application of microwave drying.

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Series: Materials
ISSN: 1996-1944
ISSN-E: 1996-1944
ISSN-L: 1996-1944
Volume: 16
Issue: 16
Article number: 5546
DOI: 10.3390/ma16165546
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Funding: This study was financially supported by the Yunnan Fundamental Research Projects (grant No. 202201AU070044) and Academy of Finland (grant No. 349833).
Academy of Finland Grant Number: 349833
Detailed Information: 349833 (Academy of Finland Funding decision)
Copyright information: © 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (