Preparation of glass-ceramics from molten blast furnace slag

Basic glass with stable properties was prepared from molten blast furnace slag by using the melting method. The heat treatment regime of glass-ceramics was determined by differential thermal analysis of the basic glass. Optimum heat treatment parameters were selected and the crystal growth pattern of glass-ceramics was analyzed by X-ray diffraction and scanning electron microscopy.The results show that the optimum heat treatment parameters of glass-ceramics are the nucleation temperature of 850℃ for 1.5 h and the crystallization temperature of 935℃ for 1 h. The crystallization grows from the surface to interior gradually. The mechanical properties of the prepared glass-ceramics,such as bending strength,acid and alkali resistance,and hardness,are better than those of ordinary marble.