Comment on the Article “Initial Reactions at the Electrodes of the FFC-Cambridge Process in Molten CaCl2 to Produce Ti” by P.S. Lai, M.L. Hu, Z.F. Qu, L.Z. Gao, C.G. Bai, T.X. Wang, S.F. Zhang, and G.B. Qiu
A recent publication by Lai et al. presents an assessment of the reaction mechanism in the electro-deoxidation of TiO2 to Ti by means of the FFC-Cambridge process. Therein, Lai et al. put forward an alternative interpretation of the reactions occurring in the early stage of the electro-deoxidation of TiO2 that is in stark contrast to the explanations presented in the pre-existing literature. Their interpretation hinges on the claim that Ti suboxides, such as Ti2O3, are unable to react to CaTiO3 when polarized cathodically in a CaCl2 melt. Herein, this claim is refuted. Several other statements made in the study by Lai et al. as well as in a follow-up study by Hu et al. from the same group are also subjected to a critical analysis and disproven. Overall, the entire new interpretation is shown to be fundamentally flawed.
The FFC-Cambridge process is a comparatively new metallurgical method for the winning of metals and alloys from their pure and mixed oxides.[
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P.S. Lai, M.L. Hu, Z.F. Qu, L.Z. Gao, C.G. Bai, T.X. Wang, S.F. Zhang, and G.B. Qiu: Metall. Mater. Trans. B, 2018, vol. 49B, pp. 3403–12.CrossRefGoogle Scholar