Abstract: The rapid cooling tailings produced in the process of silicon-titanium alloy extraction from high titanium blast furnace slags by plasma fusion technique were used as raw materials to prepare calcium aluminate cement.The chemically combined water content analysis,pore size distribution test,XRD and SEM were employed to investigate the effect of Li₂CO₃ on the hydration properties of the tailings.The results show that the rapid cooling tailings,mainly consisting of glass phase and also containing part of calcium aluminate (CA) and magnesia alumina spinel (MA) phases,have weak hydration ability;hydration of the tailings can be significantly promoted,and the mortar strength,porosity after hydration and bounding water in early hydration of the tailings are increased by adding not more than 0.1% Li₂CO₃.