Abstract: Chemical and phase compositions of the titanium slag with different FeO contents were analyzed, and the effects of FeO content on the heat release, quantity and compositions of collected slag, molten salts compositions and product quality in molten salt chlorination process were researched.The results show that the main phases of titanium slag are anosovite, rutile and silicate vitreous.With increasing FeO content, the heat release, ratio of the collected slag, contents of FeCl₃ and FeCl₂ in the molten salts, contents of FeCl₃ and solid in the products all increase for the chlorination process.It is feasible for preparation of TiCl₄ by molten salt chlorination using titanium slag with high content of FeO.However, the compositions of molten salts and collected slag are evidently affected in the chlorination process.Thus, the ratio of materials, salte limination system and slurry spray system should be adjusted to resolve the problems mentioned above.