钛粉是钛粉末冶金的关键材料。现有TiO2直接还原制备钛粉的方法存在能耗高、效率低、金属/熔盐分离困难、产品氧含量高等问题，课题提出低温熔盐电解-镁热还原TiO2制备钛粉的新思路。以MgCl2-KCl-RCl3(R=La,Y)熔盐为电解质，电解产生Mg原位还原TiO2，过程中借助RCl3及C阳极生成ROCl及COx，实现体系中O2-的高效协同脱除，一步制备低氧金属钛粉，同时彻底解决金属/熔盐分离困难的瓶颈问题。研究Ti-O-Mg、M-Cl-O系热力学，建立优势区图，为还原脱氧指明路径；研究MgCl2-KCl-RCl3熔盐结构及物化性质，获得最优氯化物熔盐体系及调控机制；研究TiO2还原电化学行为及其动力学，阐释还原机理及脱氧机制；考察反应过程中电解质性能的变化，实现电解质循环利用；形成低氧(<500ppm)金属钛粉制备新技术原型，为加快推进TiO2直接还原制备钛粉产业化进程奠定基础。

Titanium powder is the key material for titanium powder metallurgy. The existing methods for the direct reduction of TiO2 to prepare titanium powder have such problems as high energy consumption, low efficiency, difficulty in metal/molten salt separation and high oxygen content of products. A new metod for the preparation of titanium powder by the combination of low-temperature molten salt electrolysis and magnesiothermic reduction of TiO2 is proposed. Metallic Mg will deposit on the cathode and in-situ reduct TiO2 when electrolysis is conducted in MgCl2-KCl-RCl3 (R= La, Y) molten salt. The O2- in the system will be efficiently removed from the system as ROCl sediment and COx gas through the simultaneous reaction of O2- with RCl3 and C anode. Low-oxygen metallic titanium powder will be directly prepared from TiO2 in one step, and the bottleneck problem, i.e., the difficulty in metal/molten salt separation will be thoroughly solved in this project. The predominance diagrams of Ti-O-Mg and M-Cl-O (M = Mg, Y, La) systems will be firstly established based on the thermodynamic analysis in order to clearly show the path for the reduction and deoxidation of TiO2. The optimal chloride molten salt system and the corresponding regulation mechanism will be obtained based on the study of the structure and physical and chemical properties of MgCl2-KCl-RCl3 (R= La, Y) molten salt. The reduction and deoxidation mechanism will be clarified by exploration of the electrochemical behavior and kinetics of TiO2 reduction. The performance of the electrolyte during the electrolysis process will be investigated in order to realize the cyclic utilization. A new technical prototype of preparation of low-oxygen (< 500 ppm) titanium powder will be finally propsed in this project, which will lay a foundation for accelerating the industrialization process of preparation of titanium powder by direct reduction of TiO2.