Study of defluorination by thermal treatment of phosphogypsum under steam atmosphere

Huagui Jin; Xuebin An; Shizhao Wang; Yunshan Wang; Gang Yang; Yong Sun

doi:10.1016/j.cjche.2025.02.018

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Study of defluorination by thermal treatment of phosphogypsum under steam atmosphere

Updated：2026-01-06

- Study of defluorination by thermal treatment of phosphogypsum under steam atmosphere
- Chinese Journal of Chemical Engineering Vol. 85, Issue 9, Pages: 206-216(2025)
- Affiliations：
  
  1. School of Chemical Engineering and Technology, Hebei University of Technology,Tianjin,China,300130
  2. National Engineering Research Center of Green Recycling for Strategic Metal Resources, Chinese Academy of Sciences,Beijing,China,100190
  3. Department of Chemical and Environmental Engineering, University of Nottingham Ningbo China,Ningbo,China,315100
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2025.02.018
  CLC：
- Published：2025
- Accepted：
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Huagui Jin, Xuebin An, Shizhao Wang, Yunshan Wang, Gang Yang, Yong Sun. Study of defluorination by thermal treatment of phosphogypsum under steam atmosphere[J]. Chinese Journal of Chemical Engineering, 2025, 85(9): 206-216.
DOI：

Huagui Jin, Xuebin An, Shizhao Wang, Yunshan Wang, Gang Yang, Yong Sun. Study of defluorination by thermal treatment of phosphogypsum under steam atmosphere[J]. Chinese Journal of Chemical Engineering, 2025, 85(9): 206-216. DOI： 10.1016/j.cjche.2025.02.018.

摘要

Abstract

This study investigates the removal of fluorine (F) impurities from phosphogypsum (PG) using steam as the reaction medium. The effects of the reaction atmosphere

temperature

time

and steam velocity on F impurities removal were systematically examined. The results showed that with a steam velocity of 0.0184 m·s

-1

a reaction temperature of 700 ℃

and a reaction time of 60 min

the F removal rate reached 95.87%. Further investigations into the defluorination mechanism revealed that steam and SiO

synergistically enhance fluoride removal

playing a crucial role in improving the defluorination efficiency. Kinetic analysis of the defluorination process

based on the shrinking core model (SCM)

indicated that internal diffusion is the rate-controlling step

with the activation energy of 30.12 kJ·mol

-1

. This study identifies optimal conditions for PG defluorination and proposes a defluorination mechanism

contributing to the theoretical understanding of impurity removal through the thermal treatment of PG.

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