Crystallization Behavior during Preparation of Glass-Ceramics from BF Slag of Baotou Iron and Steel Company

Abstract

In this paper, the crystallization behavior including crystallization temperature, nucleation temperature, microstructure of glass-ceramics and crystal phase composition during preparation of glass-ceramics by melting method from blast furnace(BF) slag of Baotou iron and steel company, quartz sand and other materials was investigated using differential thermal analysis, X-ray diffraction and scanning electron microscopy. The results show that the crystallization peak temperatures of the parent glasses are 962~966°C when the ratio of blast furnace slag changes from 20% to 50%, and uniform, compact grains in the prepared glass-ceramics are obtained, whose diameters are about 0.2-0.5μm. In addition, the major crystalline phases are identified as diopside(Ca(Mg,Al)(Si,Al)2O6）and diopside containing aluminum(Ca(Mg0.5Al0.5)(Al0.5Si1.5O6), and the mechanical properties of glass-ceramics are good, among which the flexural strength is more than 110Mpa. The results have theoretical guidance meaning and practical reference value for realizing industrial production of preparation of glass-ceramics from BF slag of Baotou iron and steel company.