Volume 52
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Li, J., Kong, J., Zhu, Q., & Li, H. (2020). Enhanced roasting of lepidolite for high defluorination efficiency in a fluidized bed reactor. Particuology, 52, 28-35. https://doi.org/10.1016/j.partic.2019.12.002
Enhanced roasting of lepidolite for high defluorination efficiency in a fluidized bed reactor
Jun Li a, Jing Kong a, Qingshan Zhu a b *, Hongzhong Li 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
10.1016/j.partic.2019.12.002
Volume 52, October 2020, Pages 28-35
Received 22 January 2019, Revised 26 November 2019, Accepted 2 December 2019, Available online 21 January 2020, Version of Record 24 June 2020.
E-mail: qszhu@ipe.ac.cn

Highlights

• Vacuum fluidized bed (VFB) improved the defluorination efficiency of lepidolite particles.

• The improvement is attributed to the increase of the H2O/HF ratio in VFB.

• The VFB has a higher defluorination efficiency than a conventional reactor.

• Consumption of steam is greatly reduced by addition of coal char.

• The VFB roasting method is promising for the treatment of lithium ores.


Abstract

Defluorination roasting of lepidolite ore in a fluidized bed reactor has been proposed for improving the extraction efficiency of lithium. In this paper, a vacuum was introduced to the fluidized bed reactor, which significantly improved the defluorination efficiency of lepidolite particles. This improvement could be attributed to an increase in the H2O/HF ratio. The highest defluorination rate for the lepidolite particles was obtained in the fluidized bed reactor under vacuum. The rate in the vacuum reactor was 1.5–2 times that in a fixed bed reactor or conventional fluidized bed reactor. The defluorination efficiency of the lepidolite particles also improved and the consumption of steam was greatly reduced by addition of coal char. This enhancement was mainly attributed to changes in the structures of the reduced lepidolite particles. This defluorination roasting method for high lithium extraction with low water steam consumption is a promising method for lithium ore treatment.

Graphical abstract
Keywords
Vacuum fluidized bed; Defluorination roasting; Lepidolite; Lithium