Crystallization behavior during preparation of glass-ceramics from BF slag of Baotou iron and steel company

摘要

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.