University of Oulu

Chen, J., Gao, L., Guo, S., Omran, M., & Chen, G. (2022). Evaluation of the structure and valence state of titanium oxide in titania slag under microwave heating. Materials Letters, 310, 131475.

Evaluation of the structure and valence state of titanium oxide in titania slag under microwave heating

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Author: Chen, Jin1; Gao, Lei1; Guo, Shenghui1;
Organizations: 1Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, PR China
2Faculty of Technology, University of Oulu, Oulu 4600, Finland
Format: article
Version: accepted version
Access: embargoed
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Language: English
Published: Elsevier, 2022
Publish Date: 2024-03-01


The titania slag was utilized to prepare synthetic rutile using microwave roasting at a temperature of 1100 °C for 2 h. The compositions of the titania slag and the changes in the chemical states of the sample resulting from microwave roasting were studied by XRD, SEM, Raman, and XPS, respectively. The XRD results indicate that the product’s prominent peaks correspond to the standard card of rutile TiO₂ have significantly increased after microwave heating. The Raman vibration peaks at 164.2 cm⁻¹, 203.9 cm⁻¹, and 636.2 cm⁻¹ of the raw materials were caused by Ti₃O₅, Ti₂O₃, and anatase TiO₂, respectively. After microwave roasting, all the Raman vibration peaks were related to the rutile TiO₂ phase. The XPS analysis showed that the surface of the sample mainly contained Ti, C, and O elements, and after microwave roasting, the content of Ti⁴⁺ increased significantly. The results indicated that microwave roasting is an effective method to produce rutile TiO₂. The roasted product meets the requirements of high-grade synthetic rutile.

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Series: Materials letters
ISSN: 0167-577X
ISSN-E: 1873-4979
ISSN-L: 0167-577X
Volume: 310
Article number: 131475
DOI: 10.1016/j.matlet.2021.131475
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, 51404114).
Copyright information: © 2022. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http:/