Synthesis of TiCl2 powders through reactive gas phase infiltration in a fluidized bed reactor--颗粒学报PARTICUOLOGY

Song, M., Yang, Y., Zhao, H., Xiang, M., Zhu, Q., Jia, J., . . . Yue, F. (2021). Synthesis of TiCl2 powders through reactive gas phase infiltration in a fluidized bed reactor. Particuology, 57, 95-103. https://doi.org/10.1016/j.partic.2020.12.012

Synthesis of TiCl₂ powders through reactive gas phase infiltration in a fluidized bed reactor

Miao Song ^{a b}, Yafeng Yang ^{a b}, Hongdan Zhao ^{a b}, Maoqiao Xiang ^{a d *}, Qingshan Zhu ^{a b c *}, Jibin Jia ^{a b}, Chaoquan Hu ^a, Fen Yue ^a

a State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
b School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
c Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing 100190, China
d Nanjing IPE Institute of Green Manufacturing Industry, Nanjing 211135, China

10.1016/j.partic.2020.12.012

Volume 57, August 2021, Pages 95-103

Received 14 October 2020, Revised 25 November 2020, Accepted 15 December 2020, Available online 30 January 2021, Version of Record 26 February 2021.

E-mail: mqxiang@ipe.ac.cn; qszhu@ipe.ac.cn

Highlights

• Fluidized bed was employed to synthesize TiCl₂ powders with industrial potential.

• Suitable reaction systems were selected by comparing different reducing agents.

• Optimal reaction conditions were determined by comprehensive kinetic analysis.

• TiCl₂ powders were synthesized by selecting suitable raw material particle sizes.

Abstract

TiCl₂ is a promising precursor for producing metallic titanium alloys and titanium-based ceramics. However, the effective synthesis of high-quality TiCl₂ powder remains challenging. Herein, a fluidized bed reactor (FBR) providing a high gas–solid contact area was employed to synthesize TiCl₂ powder using a reliable TiCl₄–Ti reaction system. Optimal reaction conditions (600 °C and 120 min) were determined for the proposed Ti–TiCl₄ system by kinetic investigation. A dense Ti layer was regenerated upon the original surface of the Ti powder as a result of TiCl₂ disproportionation at high temperature (above 700 °C), which impeded infiltration by gaseous TiCl₄. The particle size of the Ti reducing agent played a vital role in the production of TiCl₂ powder. A mean particle size of 24.5 μm was confirmed to be the most feasible option based on the optimal chlorinated depth (17 μm).

Graphical abstract

Keywords

Titanium dichloride; Fluidization; Kinetics; Analysis

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