Abstract
This study presents the evaporation mechanism of fluoride from CaF2–CaO–Al2O3–MgO–Li2O–(TiO2) slag and their melting characteristics at different TiO2 contents by thermogravimetric analysis and melting‐temperature‐characteristic testing. FactSage is used to identify the major components evaporating from the tested slags. The results show that the slag melting point decreases with an increase in the TiO2 content. In addition, X‐ray diffraction analysis reveal that with an increase in the TiO2 content, the total CaF2 and Ca12Al14F2O32 content increase while the MgAl2O4 content decrease. The gaseous species easily evaporating from slags, including LiF and CaF2, are the primary contributors to fluoride loss. The apparent activation energy for LiF evaporation is calculated to be in the range of 116.75–227.62 kJ mol−1 and this process can be described as 3D diffusion. In the case of CaF2 evaporation, the apparent activation energy is calculated to be in the range of 365.98–492.33 kJ mol−1 and this process followed the mechanism of random nucleation and growth.
Published Version
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