Abstract
The CaTiO3 phase is the intermediate phase at the cathode in the preparation of titanium metal through the direct electrochemical deoxidization of titania in molten CaCl2. The formation mechanism of CaTiO3 in the cathode and the releasing of Cl2 from the anode were studied during deoxidation of TiO2 by FFC Cambridge process. Experiments were conducted, where a preformed TiO2 cylindrical pellet was dipped into molten CaCl2 at 900 °C under high-purity Ar to evaluate the formation of CaTiO3 from the hydrolysis of molten CaCl2. Partial electrolysis experiments were also used to confirm the formation of CaTiO3 in molten CaCl2, particularly short-time electrolysis (1, 5, 10, 20, and 30 minutes). In addition, Cl− was observed to discharge at the anode. The results show that the behaviors of both electrodes are closely related to current–time curve. After the turning point on the current–time curve, Cl2 will no longer be released, maybe no CaTiO3 will be formed.
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