Kroll process is composed a few independent thermal processes and consumes huge energy to produce metal Ti. OS process produces reductant Ca continuously in the molten salts and reduces directly Ti oxides to obtain metal Ti, which may become energy saving [1]. However, it is necessary to electrolyze for long time because the reduction speed is slow. To avoid severe problems in oxide reduction, we select TiS2 as raw material. Sulfur locates just below oxygen at periodic table, and many chemical properties are similar with oxygen. In addition, metallic Ti does not dissolve sulfur according to Ti-S binary phase diagram. Therefore, the step for sulfur removal from Ti-S solid solution can be skipped and a high quality of Ti is expected to be formed more quickly. A dry synthesis of TiS2 from TiO2[2] can be combined with the studied processes to recycle sulfur. The purpose of this work is to examine the feasibility of thermochemical and electrochemical reduction of TiS2 by the electrolysis in the molten CaCl2to establish the new metal Ti manufacturing process. Figure shows the results by the OS process at 1173 K in CaCl2-0.5mol% CaS melt. Concentration of sulfur decreased significantly at early stage. 0.043 mass %S was achieved when the stoichiometric charge Q0 was supplied, and 0.01 mass %S was achieved when Q = 4Q0 was supplied. Only Ti was identified by XRD at Q ≥ Q0. In stoichiometry, metal Ti and lower oxide were identified but no lower sulfide could be found. The electrolysis rate could be improved when the larger amount of CaS is dissolved. However, concentration of residual sulfur in Ti increased as the addition of CaS increased. In conclusion, 0.01mass%S could be obtained by the OS process. Addition of CaS could improve reduction rate, but impurity in Ti increased. It is possible to remove sulfur from Ti-S system, and the usage of Ti sulfide opens a new process of titanium refining process. Kroll process needs three steps to manufacture metal Ti, chlorinating, reduction by Mg, and electrolysis of MgCl2, while this new process needs only two steps, sulfide formation, and reduction by Ca. The authors desire the higher efficiency and energy saving using our proposal. R eferences [1] R.O. Suzuki, K. Teranuma and K. Ono, Metall. Mater. Trans B, 34B, [6] 287 (2003). [2] S.Hirai, M.Ohta, S.Satoh, and T.Kuzuta, Acta Materialia60 (2012) 7232-7240 Acknowledgements: This work was partly supported by the "Innovative Structural Materials Project (ISMA, Future Pioneering Projects)” and KOBE STEEL, LTD. The authors thank Prof. S. Hirai at Muroran Institute of Technology for discussion. Figure 1