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Calciothermic reduction of titanium oxide and in-situ electrolysis in molten CaCl2

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Abstract

A concept for calciothermic direct reduction of titanium dioxide in molten CaCl2 is proposed and experimentally tested. This production process consists of a single cell, where both the thermochemical reaction of the calciothermic reduction and the electrochemical reaction for recovery of the reducing agent, Ca, coexist in the same molten CaCl2 bath. A few molar percentages of Ca dissolve in the melt, which gives the media a strong reducing power. Using a carbon anode and a Ti basket-type cathode in which anatase-type TiO2 powder was filled, a metallic titanium sponge containing 2000 ppm oxygen was produced after 10.8 ks at 1173 K in the CaCl2 bath. The optimum concentration of CaO in the molten CaCl2 was 0.5 to 1 mol pct, to shorten the operating time and to achieve a lower oxygen content in Ti.

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Author notes

  1. Koh Teranuma (Graduate Student, Master Course)

    Present address: Graduate School of Energy Science, Kyoto University, Japan

Authors and Affiliations

  1. the Department of Energy Science and Technology, Kyoto University, Kyoto, Japan

    Ryosuke O. Suzuki (Associate Professor) & Katsutoshi Ono (Professor Emeritus)

  2. Research Staff Member with Toho Gas Company, Nagoya, Japan

    Koh Teranuma (Graduate Student, Master Course)

Authors
  1. Ryosuke O. Suzuki
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  2. Katsutoshi Ono
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  3. Koh Teranuma
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Suzuki, R.O., Ono, K. & Teranuma, K. Calciothermic reduction of titanium oxide and in-situ electrolysis in molten CaCl2 . Metall Mater Trans B 34, 287–295 (2003). https://doi.org/10.1007/s11663-003-0074-1

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  • DOI: https://doi.org/10.1007/s11663-003-0074-1

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