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Development of a Novel Titania Slag Upgrading Process Using Titanium Tetrachloride

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Abstract

In order to remove iron from titania slag for the production of high-grade titanium dioxide (TiO2), a novel slag upgrading process was developed based on a selective chlorination method. In the experiments, various types of suitably pretreated slag reacted with titanium tetrachloride (TiCl4) as a chlorinating agent at 1100 K (827 °C) for 5 hours in the presence of carbon. Once the reaction had reached completion, the iron in the slags was selectively removed as iron chloride (FeCl2) in a dry form. As a result, the mass percent of iron decreased from 13.9 to 0.21 pct (nominal, excluding oxygen) and the mass percent of titanium increased from 78.1 to 96.0 pct (nominal, excluding oxygen) under certain conditions. Therefore, this selective chlorination process using TiCl4 is considered a feasible approach for the upgrading of titania slag.

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Acknowledgments

The authors are grateful to Professors Kazuki Morita and Takeshi Yoshikawa, at The University of Tokyo; Professor Tetsuya Uda, Kyoto University; Professor Osamu Takeda, Tohoku University; and Messrs. Susumu Kosemura, Masanori Yamaguchi, Yuichi Ono, and Junzo Hino, at Toho Titanium Co., Ltd., for their valuable discussions and the supply of samples throughout this study. Furthermore, the authors thank Dr. Katsuhiro Nose, Dr. Yu-ki Taninouchi, and Mr. Syunya Sakakida for their valuable suggestions and technical assistance. This research was partly funded by a Grant-in-Aid for the Next Generation of World-Leading Researchers (NEXT Program) for the Research Project for Development of Environmentally Sound Recycling Technology of Rare Metals (NEXT Program #GR019), and Grant-in-Aid for Scientific Research (S) (KAKENHI Grant #26220910), KIBAN S, by JSPS. Jungshin Kang is grateful for the financial support that was partly provided by a Grant-in-Aid for Basic Research Project (15-3243) of the KIGAM, Korea, the MEM International Graduate Program from MEXT, Japan, and the Grants for Excellent Graduate Schools from MEXT, Japan.

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Authors and Affiliations

  1. Department of Materials Engineering, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan

    Jungshin Kang (Graduate Student, Senior Researcher, Assistant Professor)

  2. Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-8505, Japan

    Jungshin Kang (Graduate Student, Senior Researcher, Assistant Professor) & Toru H. Okabe (Professor)

  3. Korea Institute of Geoscience and Mineral Resources, 124 Gwahang-no, Yuseong-gu, Daejeon, 305-350, Korea

    Jungshin Kang (Graduate Student, Senior Researcher, Assistant Professor)

  4. University of Science and Technology, 217 Gajeong-ro, Yuseong-gu, Daejeon, 305-350, Korea

    Jungshin Kang (Graduate Student, Senior Researcher, Assistant Professor)

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  1. Jungshin Kang
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  2. Toru H. Okabe
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Correspondence to Jungshin Kang.

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Manuscript submitted March 31, 2015.

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Kang, J., Okabe, T.H. Development of a Novel Titania Slag Upgrading Process Using Titanium Tetrachloride. Metall Mater Trans B 47, 320–329 (2016). https://doi.org/10.1007/s11663-015-0507-7

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