University of Oulu

Huang, W., Zhang, Y., Lu, J., Chen, J., Gao, L., Omran, M., & Chen, G. (2023). Microwave drying method investigation for the process and kinetics of drying characteristics of high-grade rutile TiO2. Ceramics International, 49(10), 15618–15628.

Microwave drying method investigation for the process and kinetics of drying characteristics of high-grade rutile TiO₂

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Author: Huang, Weiwei1; Zhang, Yanqiong1; Lu, Jiajia1;
Organizations: 1Kunming Key Laboratory of Energy Materials Chemistry, Yunnan Minzu University, Kunming, 650500, Yunnan, PR China
2Process Metallurgy Research Group, Faculty of Technology, University of Oulu, Finland
Format: article
Version: accepted version
Access: embargoed
Persistent link:
Language: English
Published: Elsevier, 2023
Publish Date: 2025-01-20


Titanium dioxide has been extensively applied in aviation, cosmetics, the chemical industry, and coatings. Currently, the primary way to prepare high-grade rutile TiO2 is the chlorination method, which mainly uses ilmenite or titanium slag as raw material through the chlorination process and then reacts it in an oxidation furnace to prepare titanium powders. However, the TiO₂ material produced by the liquid-phase method contains a large amount of water, which makes the equipment vulnerable to corrosion in the subsequent process. Meanwhile, the sharp temperature change will lead to the accumulation of water vapor, which may lead to explosion and severe agglomeration, resulting in high research costs and reduced product performance. Therefore, drying equipment with high drying efficiency, high product quality, and low carbon is urgently needed. This paper used microwave drying equipment to assist in drying rutile TiO₂ powders. Results indicated that the microwave power, moisture content, and initial mass positively related to the drying rate. The drying process was simulated and analyzed using four common thin-layer kinetic models. A good agreement was that the Modified Page model was in good agreement with the actual drying process of TiO₂. The effective diffusion coefficient was calculated. After calculation, the activation energy of microwave-drying TiO₂ was 8.22 g/W. This article offers a kinetic theoretical basis and abundant data guidelines for actual products to reinforce the drying of high-grade TiO₂ powders.

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Series: Ceramics international
ISSN: 0272-8842
ISSN-E: 1873-3956
ISSN-L: 0272-8842
Volume: 49
Issue: 10
Pages: 15618 - 15628
DOI: 10.1016/j.ceramint.2023.01.152
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: 51504110 , and 51404114 ) and Innovative Research Team (in Science and Technology) in University of Yunnan Province were sincerely acknowledged.
Copyright information: © 2023. This manuscript version is made available under the CC-BY-NC-ND 4.0 license