Materials Transactions Online

Materials Transactions, Vol.58 No.03 (2017) pp.350-354
© 2017 The Japan Institute of Metals and Materials

Dissolution of Calcium Titanate in Calcium Chloride Melt and Its Application to Titanium Electrolysis

Toshihide Takenaka1, Kakeru Shimokawa2, Kazuyoshi Nishikawa2, Haruka Okada1 and Taiki Morishige1

1Faculty of Chemistry, Materials and Bioengineering, Kansai University, Suita, 564-8680, Japan
2Graduate School of Science and Engineering, Kansai University, Suita, 564-8680, Japan

The solubility of calcium titanate in CaCl2 melt was investigated above 1373 K, and electrodeposition of Ti metal in the melt was attempted. Many pits were formed on the surface of sintered CaTiO3 compact by the immersion in CaCl2 melt above 1373 K. The weight of the compact decreased with the increase in the immersion time, and the decrease got faster with the increase in temperature. Cathodic current in cyclic voltammetry increased with the addition of CaTiO3 powder in the bath, and the increase in the cathodic currents depended on the bath temperature and the added amount of CaTiO3. From the results by the electrochemical measurement, the solubilities of CaTiO3 in CaCl2 melt were estimated about 7 mol% at 1573 K, and less than 1 mol% at 1373 K. Metallic Ti was detected by XRD analysis in the electrodeposit obtained by potentio-static electrolysis in the bath containing CaTiO3 above 1373 K, but the amount of Ti metal seemed a little. The similar results were obtained in CaCl2 melt containing Ca3Ti2O7 though the detailed study has not been completed. It was concluded that calcium titanate was soluble in molten CaCl2 above 1373 K, and that the CaCl2 bath containing calcium titanate could be applied to Ti electrolysis.

[doi:10.2320/matertrans.MK201615]

(Received 2016/09/01; Accepted 2016/12/12; Published 2017/02/25)

Keywords: titanium, calcium titanate, calcium chloride, molten salt, solubility, electrolysis

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