University of Oulu

Jin Chen, Qi Jiang, Kangqiang Li, Mamdouh Omran, Lei Gao, Guo Chen, The productive preparation of synthetic rutile from titanium slag via an improved microwave heating and acid-alkali joint leaching approach, Chemical Engineering and Processing - Process Intensification, Volume 172, 2022, 108773, ISSN 0255-2701,

The productive preparation of synthetic rutile from titanium slag via an improved microwave heating and acid-alkali joint leaching approach

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Author: Chen, Jin1; Jiang, Qi1; Li, Kangqiang1,2;
Organizations: 1Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China
2Key Laboratory of Aerospace Materials and Performance, Ministry of Education, School of Materials Science and Engineering, Beihang University, Beijing 100191, China
3Faculty of Technology, University of Oulu, Finland
4Joint Research Centre for International Cross-border Ethnic Regions Biomass Clean Utilization in Yunnan, Yunnan Minzu University, Kunming 650500, China
Format: article
Version: accepted version
Access: embargoed
Persistent link:
Language: English
Published: Elsevier, 2022
Publish Date: 2023-12-29


The paper presents the conversion process from titanium slag to rutile TiO₂ through adopting the process route in the order of “Alkali leaching-Microwave roasting-Acid leaching-Microwave calcination”. The transformations of the slag samples in terms of phase composition, molecular structure, and other changes before and after the process were observed through analytical technics such as XRD, Raman, FI-IR and SEM. The characterization results all showed that the series of process treatment not only converted the phase of high-titanium slag from the black rock into rutile TiO₂, but also significantly reduced impurities, with the improved rutile TiO₂ grade meets the production standards of titanium dioxide using the chlorination process. The work highlights that the combined process of microwave heating and acid-alkali joint leaching is a potential and productive approach for preparing artificial rutile TiO₂ from titanium slag.

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Series: Chemical engineering and processing
ISSN: 0255-2701
ISSN-E: 1873-3204
ISSN-L: 0255-2701
Volume: 172
Article number: 108773
DOI: 10.1016/j.cep.2021.108773
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Funding: The authors acknowledge the financial supports from the National Natural Science Foundation of China (No: 51404114, 51504110).
Copyright information: © 2022. This manuscript version is made available under the CC-BY-NC-ND 4.0 license