中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 34 No. 2 February 2024 |
（1. Key Laboratory for Nonferrous Vacuum Metallurgy of Yunnan Province, Kunming University of Science and Technology, Kunming 650093, China;
2. National Engineering Research Center of Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, China;
3. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China;
4. State Key Laboratory of Complex Non-ferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China）
Abstract:A new method for the preparation of low oxygen titanium was proposed by the direct reduction of TiO2 with Mg produced by MgCl2-KCl-YCl3 molten salt electrolysis. The Mg-Ti-O phase diagram indicates that it is feasible to reduce TiO2 using Mg, and the φ-pO2- diagrams indicate that deep deoxidation of titanium in molten MgCl2-YCl3 is also feasible. The experimental study on the reduction of TiO2 was carried out in MgCl2-YCl3 and MgCl2-YCl3-KCl molten salts. The results showed that the O2- from the reduction and deoxygenation was removed using YOCl precipitation and COx gas production and TiO2 can be reduced to titanium peroxide (Ti6O) by electrochemical reduction at 1073-1173 K and 2.5-3.1 V. The high-oxygen titanium was electrochemically deoxidized in the molten salt of MgCl2-YCl3 at a temperature of 1173 K at different voltages. Moreover, it was observed that it is possible to reduce the high oxygen content of titanium from 1200×10-6 to less than 100×10-6 oxygen.
Key words: titanium dioxide; electrochemistry; magnesium reduction; deoxidation; ultralow-oxygen Ti; rare earth metals
