Towards a sustainable technology for production of extra-pure Ti metal:Electrolysis of sulfurized Ti(C,N)in molten CaCl_(2)  

作　　者：Eltefat Ahmadi Ryosuke O.Suzuki Tatsuya Kikuchi Takumi Kaneko Yuta Yashima 

机构地区：[1]Division of Materials Science and Engineering,Faculty of Engineering,Hokkaido University,Sapporo 060-8628,Japan [2]Japan Society for the Promotion of Science(JSPS),Tokyo 102-0083,Japan

出　　处：《International Journal of Minerals,Metallurgy and Materials》2020年第12期1635-1643,共9页矿物冶金与材料学报（英文版）

基　　金：The Japan Society for the Promotion of Science(JSPS)Postdoctoral Fellowship(No.P18054);Grants-in-Aid for Scientific Research(KAKENHI)(Nos.18F18054 and 17H03434);the Ministry of Education,Culture,Sports,Science and Technology(MEXT)Nanotechnology Platform Program(No.A-19-HK-0034);the Japan Mining Industry Association;support from JSPS and the International affairs office of the Faculty of Engineering,Hokkaido University。

摘　　要：A new concept for producing highly pure Ti metal powder from ilmenite(FeTiO)_(3))is proposed in this article.Titanium nitride(TiN)or titanium oxycarbonitride(TiO_(x)C_(y)N_(z))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 toα-Ti powders with spherical morphology using electrolysis in molten CaCl_(2).Xray 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 0.15 wt%O,0.02 wt%C,and 0.003 wt%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.

关 键 词：TITANIUM molten salt electrolysis SULFIDATION titanium oxycarbonitride ILMENITE 

分 类 号：TF823[冶金工程—有色金属冶金]