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The Korean Institute of Metals and Materials (대한금속재료학회)
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Solubility of TiO2 in NaF-CaF2-BaF2 Melts

  • Yoo, Jeong-Hyun (Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Cho, Sung-Wook (Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources)
  • Received : 2018.04.19
  • Accepted : 2018.06.02
  • Published : 2018.11.20
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Abstract

The solubility of $TiO_2$ in $NaF-CaF_2-BaF_2$ ternary eutectic melts was investigated at the temperature range of $1025-1150^{\circ}C$. The least-squares equation was obtained from the relationship between the reciprocal temperature and the natural logarithm of the titanium concentration in the melts saturated with $TiO_2$. The corresponding partial molar enthalpy of dissolution of $TiO_2$ was found to be 188 kJ/mol. The titanium saturation concentration was 3.73 wt% at $1100^{\circ}C$. From the titanium concentration change with the added amount of $TiO_2$ at different holding time after a final stirring, it was found that not only complete dissolution of $TiO_2$ but also enough sedimentation of excessive $TiO_2$ should be guaranteed to obtain more reliable solubility data. The holding time of 10 h was found to be enough for the excessive $TiO_2$ particles to settle down in our experimental conditions. It is noteworthy that in case of adding $TiO_2$ in excess of its solubility, the $Ba_{1.12}(Ti_8O_{16})$ phase was observed at the lower and bottom of the solidified salt ingots.

Keywords

Acknowledgement

Supported by : Korea Institute of Geoscience and Mineral Resources (KIGAM)

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