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Volume 27 Issue 12
Dec.  2020

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Eltefat Ahmadi, Ryosuke O. Suzuki, Tatsuya Kikuchi, Takumi Kaneko,  and Yuta Yashima, Towards a sustainable technology for production of extra-pure Ti metal: Electrolysis of sulfurized Ti(C,N) in molten CaCl2, Int. J. Miner. Metall. Mater., 27(2020), No. 12, pp. 1635-1643. https://doi.org/10.1007/s12613-020-2162-5
Cite this article as:
Eltefat Ahmadi, Ryosuke O. Suzuki, Tatsuya Kikuchi, Takumi Kaneko,  and Yuta Yashima, Towards a sustainable technology for production of extra-pure Ti metal: Electrolysis of sulfurized Ti(C,N) in molten CaCl2, Int. J. Miner. Metall. Mater., 27(2020), No. 12, pp. 1635-1643. https://doi.org/10.1007/s12613-020-2162-5
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研究论文

高纯钛金属的可持续制备技术:硫化Ti(C,N)的产物在熔盐CaCl2中的电解

  • Research Article

    Towards a sustainable technology for production of extra-pure Ti metal: Electrolysis of sulfurized Ti(C,N) in molten CaCl2

    + Author Affiliations
    • A new concept for producing highly pure Ti metal powder from ilmenite (FeTiO3) is proposed in this article. Titanium nitride (TiN) or titanium oxycarbonitride (TiOxCyNz) could be synthesized in the first step via the simultaneous carbothermal reduction and nitridation (CTRN) of FeTiO3 to remove oxygen roughly. To separate oxygen completely, high-quality TiS2 samples were then synthesized from TiN and TiC using S2 gas, and the clean sulfides were finally reduced to α-Ti powders with spherical morphology using electrolysis in molten CaCl2. X-ray diffraction (XRD), scanning electron microscopy (SEM) in conjunction with energy-dispersive X-ray spectroscopy (EDS), and elemental LECO analysis were used to study the phases and microstructures of the sulfides and the electrochemically reduced powders. The Ti powder showed no carbon contamination and consisted of high-purity foil-like Ti sheets with very low oxygen, carbon, and nitrogen contents of less than 0.15wt% O, 0.02wt% C, and 0.003wt% N, respectively. The quality of the Ti powder was much higher than that of the powder obtained using the conventional OS process (proposed by K. Ono and R.O. Suzuki) starting directly from the oxides.

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