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Fluorination of α-Fe2O3 by NH4HF2 to Produce FeF3

Authors
  • Wang, Hong1, 2
  • Zhou, Yuebo1, 2
  • Mo, Chenggang1, 2
  • Zhang, Lina1, 2
  • Cui, Junjun3
  • 1 School of Mechanical Engineering and Automation, Shenyang Institute of Technology, Fushun, 113122, China , Fushun (China)
  • 2 Liaoning Key Laboratory of Information Physics Fusion and Intelligent Manufacturing for CNC Machine, Shenyang Institute of Technology, Fushun, 113122, China , Fushun (China)
  • 3 Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China , Shenyang (China)
Type
Published Article
Journal
Russian Journal of Inorganic Chemistry
Publisher
Pleiades Publishing
Publication Date
Dec 01, 2021
Volume
66
Issue
14
Pages
2017–2026
Identifiers
DOI: 10.1134/S0036023621140060
Source
Springer Nature
Keywords
Disciplines
  • Synthesis and Properties of Inorganic Compounds
License
Yellow

Abstract

AbstractFluorination of α-Fe2O3 by NH4HF2 has been analyzed in this study using simultaneous thermogravimetry and differential thermal analysis (TG-DTA), scanning electron microscopy (SEM), and X-ray powder diffraction (XRD). The results indicated that the mass ratio NH4HF2 to Fe2O3 has no influence on the fluorination process. The fluorination starts at room temperature, dominates at 175.6°C, and completes at 200°C with the formation of (NH4)3FeF6. With further heat-treatment, (NH4)3FeF6 progressively releases NH4F by the formation of NH4FeF4 at 258.1°C, then (NH4)0.18FeF3 at 320°C and finally FeF3 with minor FeF2 at 400°C. NH4F released during the decomposition of (NH4)3FeF6 will fluorinate the un-reacted Fe2O3.

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