Preparation of low-oxygen titanium powder by magnesiothermic reduction of TiO_(2) assisted by MgCl_(2)−HoCl_(3) molten salt  

MgCl_(3)-HoCl_(3)熔盐辅助镁热还原TiO_(2)制备低氧钛粉

作　　者：Li-guo ZHU Chong-lin BAI Ling-xin KONG Bin YANG Bao-qiang XU 朱立国;白崇霖;孔令鑫;杨斌;徐宝强(昆明理工大学云南省有色金属真空冶金重点实验室,昆明650093;昆明理工大学省部共建复杂有色金属资源清洁利用国家重点实验室,昆明650093;昆明理工大学真空冶金国家工程研究中心,昆明650093;昆明理工大学冶金与能源工程学院,昆明650093)

机构地区：[1]Key Laboratory for Nonferrous Vacuum Metallurgy of Yunnan Province,Kunming University of Science and Technology,Kunming 650093,China [2]State Key Laboratory of Complex Non-ferrous Metal Resources Clean Utilization,Kunming University of Science and Technology,Kunming 650093,China [3]National Engineering Research Center of Vacuum Metallurgy,Kunming University of Science and Technology,Kunming 650093,China [4]Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China

出　　处：《Transactions of Nonferrous Metals Society of China》2024年第11期3749-3761,共13页中国有色金属学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (No.21968013)。

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。

关 键 词：titanium powder MgCl_(2)−HoCl_(3)molten salt TiO_(2) HoOCl magnesiothermic reduction 

分 类 号：TF123[冶金工程—粉末冶金]