Abstract: Following ironmaking process in BF,a great deal of titanium is brought from iron conentrate into slag.In order to recycle the titanium in water-quenched Ti-bearing blast furnace slag,hydrochloric acid is used in the leaching process.Possible influencing factors on leaching rate are investigated.The result indicates that a large amount of Ca,Mg,Al and Ti dissolves in hydrochloric acid solution in leaching process.Among the potential influencing factors investigated in experiments,raw materials size has no influence on Ti leaching rate,while hydrochloric acid concentration,reaction time,reaction temperature and ratio of liquid over solid have a pronounced impact on it.The optimum leaching conditions are thus obtained as follows: concentration of hydrochloric acid of 30% above,residence time for 120 min,ratio of liquid over solid of 7.5 above,and temperature at 90 ℃.Under the optimum leaching conditions,the leaching rate of titanium can reach 90% above.