Abstract: Using titanium-bearing blast furnace slag（mass fraction，50%~72%） of Chengde Iron and Steel Company，quartz， boric acid，and borax as the main raw materials，composition selecting in the phase-separation region of the Na₂O-CaO- Al₂O₃-B₂O₃-SiO₂-TiO₂ system，the glass sample was prepared through mixed batch and melted at 1 250 ℃ in a van-type electric furnace.TiO₂ whiskers were achieved by heat-treatment to the glass sample at 700~900 ℃.The phase and morphology of the sample were analyzed by XRD and SEM.Results indicated that the diameter of CaTiO₃ whiskers was 0.5~1 μm， and the aspect ratio was more than 50，when the heat-treatment was at 850 ℃. The Na₂O content in the composition of the sample had great influence on the generation of CaTiO₃ whiskers.Through adding Na₂O to the glass composition，the［BO₃］ of glass system transformed to［BO₄］ and the glass phase separation interfaces increased，then favorable nucleation sites promoted the growth of the whiskers.The photocatalytic efficiency of the sample could reach 58%.

Key words: titanium-bearing blast furnace slag, TiO₂ whiskers, photocatalytic efficiency