University of Oulu

Zheng, H., Hao, X., Zhang, S., Omran, M., Chen, G., Chen, J., & Gao, L. (2022). Modeling of process and analysis of drying characteristics for natural TiO2 under microwave heating. Chemical Engineering and Processing - Process Intensification, 174, 108900.

Modeling of process and analysis of drying characteristics for natural TiO₂ under microwave heating

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Author: Zheng, Hewen1,2; Hao, Xiandong1,2; Zhang, Sirui1,2;
Organizations: 1Kunming Key Laboratory of Energy Materials Chemistry, Key Laboratory of Green-Chemistry Materials in University of Yunnan Province, Yunnan Minzu University, Kunming 650500, PR China
2Key Laboratory of Unconventional Metallurgy, Ministry of Education, Kunming University of Science and Technology, Kunming 650500, PR China
3Faculty of Technology, University of Oulu, Finland
Format: article
Version: accepted version
Access: embargoed
Persistent link:
Language: English
Published: Elsevier, 2022
Publish Date: 2024-03-24


In this paper, factors affecting the microwave drying characteristics of rutile TiO₂ were discussed, and the data were fitted with nine common thin layers drying kinetic models. The results demonstrate that the drying efficiency of rutile TiO₂ shows a positive relationship with microwave power. With a microwave power increase from 320W to 640W, the drying time is shortened by 35.7%. The microwave drying efficiency presents a positive relationship with initial moisture content. With a moisture content increase from 2% to 12%, the average drying rate increased from 0.009% · s⁻¹ to 0.054% · s⁻¹. Additionally, the microwave drying efficiency is positively correlated with the initial mass when the initial mass is below 45 g. Otherwise, the microwave drying efficiency is negatively correlated with the initial mass. Besides, kinetic models were used to understand the microwave drying process of nature rutile TiO₂. The results show that the Modified Page model agrees well with the experimental data, and the fitting parameters are consistent with the law of matching degree. The demonstration of microwave drying techniques can be applied effectively and efficiently to the treatment processing of drying of the raw materials of metallurgy and chemical industry with the theoretical and scientific basis.

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Series: Chemical engineering and processing
ISSN: 0255-2701
ISSN-E: 1873-3204
ISSN-L: 0255-2701
Volume: 174
Article number: 108900
DOI: 10.1016/j.cep.2022.108900
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Funding: Financial supports from the National Natural Science Foundation of China (No: 51764052) and the Innovative Research Team (in Science and Technology) at the University of Yunnan Province were sincerely acknowledged.
Copyright information: © 2022. This manuscript version is made available under the CC-BY-NC-ND 4.0 license