摘要
To reduce the production cost of titanium,a new method for direct preparation of low-oxygen titanium powder by the magnesiothermic reduction of TiO_(2) with the assistance of a MgCl_(2)−HoCl_(3) molten salt was proposed.Thermodynamic calculations showed that the magnesiothermic reduction of TiO_(2) was feasible.However,hindrance of the reduction reaction by the reduction by-product of MgO resulted in a considerably high O concentration in the titanium powder.The addition of HoCl_(3) to the system significantly reduces the activity of MgO to produce low-oxygen titanium powder.Thermochemical deoxidation and reduction experiments were conducted with MgCl_(2)−HoCl_(3) molten salt in the temperature range of 1023−1273 K.The results showed that titanium powder with oxygen concentration(mass fraction)below 5.00×10^(-4) can be prepared at the Mg−MgCl_(2)−HoOCl−HoCl_(3) equilibrium.
为了降低钛的生产成本,提出一种MgCl_(2)-HoCl_(3)熔盐辅助镁热还原TiO_(2)直接制备低氧钛粉的新方法。热力学计算表明,镁热还原TiO_(2)是可行的。然而,还原副产物氧化镁阻碍了还原反应的进行,导致钛粉的氧含量较高。往体系中加入HoCl_(3)显著降低了MgO的活性,从而制备低氧钛粉。在1023~1273 K下,以MgCl_(2)-HOCl_(3)为熔盐,开展热化学脱氧和还原实验研究。结果表明,在Mg-MgCl_(2)-HoOCl-HoCl_(3)平衡条件下可以制备氧含量低于5.00×10^(-4)(质量分数)的钛粉。
基金
financially supported by the National Natural Science Foundation of China (No.21968013)。
作者简介
Li-guo ZHU,contributed equally to this work;Chong-lin BAI,contributed equally to this work;Corresponding author:Ling-xin KONG,Tel:+86-15987180307,E-mail:kkmust@126.com;Corresponding author:Bin YANG,Tel:+86-871-65161583,E-mail:kgyb2005@126.com。
