Studies on fluorination of magnetite by NH4HF2
DOI:
https://doi.org/10.17159/Abstract
Fluorination of magnetite (Fe3O4) by NH4HF2 was investigated using simultaneous thermogravimetry and differential thermal analysis (TG-DTA), and observing the morphology and phase changes using scanning electron microscopy (SEM) and X-ray diffraction (XRD). Fluorination with the involvement of oxygen starts at room temperature, dominates at 178.4℃ and completes at 200℃ with the formation only (NH4)3FeF6. On heating, (NH4)3FeF6 gradually releases NH4F by the formation of NH4FeF4 at 259℃, then (NH4)0.18FeF3 at 327℃ and finally FeF3+minor FeF2 at 400℃ due to the partial reduction of Fe (Ш) to Fe (П). At 550℃, the oxidation of FeF3 caused the formation of FeOF/Fe2O3.
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