Preparation of low-oxygen titanium powder by magnesiothermic reduction of TiO2 in KCl–MgCl2–YCl3 molten salt
Preparation of low-oxygen titanium powder by magnesiothermic reduction of TiO2 in KCl–MgCl2–YCl3 molten salt
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DOI：
10.1016/j.jmrt.2023.06.157
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发表时间：
2023-07
期刊：
影响因子：
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通讯作者：
Liguo Zhu;L. Kong;Chonglin Bai;Bao-qiang Xu;Bin Yang
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文献类型：
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作者：
Liguo Zhu;L. Kong;Chonglin Bai;Bao-qiang Xu;Bin Yang
克罗尔工艺是目前工业上唯一有效生产低氧浓度（500 ppm）海绵钛的方法。但其存在加工时间长、效率低、能耗高等局限性，导致钛的生产成本较高。为了降低生产成本，设计了一种在KCl-MgCl 2 -YCl 3 熔盐中镁热还原TiO 2 制备低氧钛粉的方法。热力学计算结果表明，TiO 2 在1073、1173和1273 K下镁热还原制备钛粉是可行的。此外，Mg/MgCl 2/YCl 3/YOCl平衡下Mg的脱氧极限在1073、1173和1273 K下分别为3、12和38 ppm。实验结果表明，在KCl-MgCl 2 熔盐中(即YCl 3 (a Y Cl 3 )活度为0)进行还原，得到了氧浓度约为10000 ppm的高钛粉。在熔盐中添加YCl 3 制备低氧钛粉，形成氯氧化钇(YOCl)(TiO 2 (s)+2Mg(l)+2YCl 3 (l)=Ti(s)+2MgCl 2 (l)+2YOCl(s))。另外，在1173K下，当YCl 3 (a Y Cl 3 )的活度为1时，得到氧浓度低至150ppm的钛粉末。基于这些结果，设计了一种制备低氧钛粉的新工艺。所提出的过程快速且高效，预计其未来在工业中的应用。
The Kroll process is currently the only effective method in industry to produce sponge titanium with a low-oxygen concentration (500 ppm). However, it has several limitations, such as a long processing time, low efficiency, and high energy consumption, resulting in the high production cost of titanium. To reduce the production cost, a method to prepare low-oxygen titanium powder by magnesiothermic reduction of TiO 2 in KCl–MgCl 2–YCl 3 molten salt was designed. The thermodynamic calculation results showed that it was feasible to prepare titanium powder by the magnesiothermic reduction of TiO 2 at 1073, 1173, and 1273 K. In addition, the deoxidation limits of Mg under Mg/MgCl 2/YCl 3/YOCl equilibrium were 3, 12, and 38 ppm at 1073, 1173, and 1273 K, respectively. The experimental results showed that titanium powder with a high oxygen concentration of approximately 10,000 ppm was obtained when the reduction was conducted in KCl–MgCl 2 molten salt (ie, the activity of YCl 3 (a Y C l 3) was 0). Low-oxygen titanium powder was prepared with the addition of YCl 3 in the molten salt and formed yttrium oxychloride (YOCl)(TiO 2 (s)+ 2Mg (l)+ 2YCl 3 (l)= Ti (s)+ 2MgCl 2 (l)+ 2YOCl (s)). Moreover, at 1173 K, when the activity of YCl 3 (a Y C l 3) was 1, titanium powder with an oxygen concentration as low as 150 ppm was obtained. Based on these results, a novel process for preparing low-oxygen titanium powder was designed. The proposed process is fast and highly efficient, and its future application in industry is anticipated.