University of Oulu

Chen, J., Guo, S., Omran, M., Gao, L., Zheng, H., & Chen, G. (2022). Microwave-assisted preparation of nanocluster rutile TiO2 from titanium slag by NaOH-KOH mixture activation. Advanced Powder Technology, 33(5), 103549.

Microwave-assisted preparation of nanocluster rutile TiO₂ from titanium slag by NaOH-KOH mixture activation

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Author: Chen, Jin1,2; Guo, Shenghui1; Omran, Mamdouh3;
Organizations: 1Key Laboratory of Unconventional Metallurgy, Ministry of Education, Kunming University of Science and Technology, Kunming 650500, PR China
2Kunming Key Laboratory of Energy Materials Chemistry, Key Laboratory of Green-Chemistry Materials in University of Yunnan Province, Yunnan Minzu University, 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: 2024-04-06


Rutile titanium dioxide is widely used in coatings, cosmetics, paper products, and other industries as the source of white inorganic pigment. The common preparation methods of rutile from titanium slag include the molten salt method, hydrochloric acid method, oxidation–reduction method, etc. In this paper, the NaOH-KOH sub-molten salt method was used to activate titanium slag. After a series of subsequent leaching processes and an attached roasting process with the assistance of microwave technology, a nanocluster was formed by nanorods with a diameter below 100 nm and a length below 500 nm. It is found that titanate changes to the stable metantitanate at a temperature of 80 °C in the process of acid leaching. Moreover, the relationship between the concentration of sub-molten salt, calcination temperature, and titanium leaching rate was analysed by kinetics. The results show that the leaching rate of titanium reached the peak when the mixed alkali concentration was 15 mol/L, and the leaching rate of titanium reached the maximum value when the roasting temperature was 450 °C. According to the Arrhenius equation, the activation energy of titanium slag in the NaOH-KOH sub-molten salt system was 130.8 kJ/mol. The pre-exponential factor was 5.44 × 10⁻⁴ m²/s, and a chemical reaction process controlled the whole process.

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Series: Advanced powder technology
ISSN: 0921-8831
ISSN-E: 1568-5527
ISSN-L: 0921-8831
Volume: 33
Issue: 5
Article number: 103549
DOI: 10.1016/j.apt.2022.103549
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