**4. Conclusions**

Based on above analysis, comprehensive and systematic conclusions were done on the scientific issues to be clarified in the high-purity titanium molten salt electrorefining process. The influence of anion and cation in electrolyte on ionic equilibrium of titanium was discussed systematically by chemical analysis and electrochemical testing. Specifically, the type of microstructure of the molten salt is dissected in the molten salt mainly composed of chloride. The coordination mechanism between titanium ion and fluoride ion was also revealed. The mechanism of anodic oxidation and cathodic reduction kinetics in electrolytes with different micro-structures was clarified, which provide a guiding line for optimizing electrolyte. More importantly, on the basis of full theoretical and experimental research, it proposes parameters for high-purity titanium extraction in molten salt, and provides theoretical support for the establishment of efficient, low-pollution, and lowcost metallurgical processes.
