Effects of sintering atmosphere on the physical and mechanical properties of modified BOF slag glass

作     者：Wen-bin Dai Yu Li Da-qiang Cang Yuan-yuan Zhou Yong Fan 

作者机构：State Key Laboratory of Advanced MetallurgyUniversity of Science and Technology Beijing School of Metallurgical and Ecological EngineeringUniversity of Science and Technology Beijing Institute of Multidisciplinary Research for Advanced MaterialsTohoku University 

出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)

年 卷 期：2014年第21卷第5期

页      面：494-502页

核心收录：

学科分类：080602[工学-钢铁冶金] 08[工学] 0806[工学-冶金工程] 

基　　金：financially supported by the State Key Program of National Natural Science Foundation of China(No.51034008) the Fundamental Research Funds for the Central Universities of China(No.2302010FRF-MP-10006B) 

主　　题：glass ceramics slags sintering iron oxides physical properties mechanical properties 

摘      要：This study proposes an efficient way to utilize all the chemical components of the basic oxygen fttrnace （BOF） slag to prepare high value-added glass-ceramics. A molten modified BOF slag was converted from the melting BOF slag by reducing it and separating out iron component in it, and the modified BOF slag was then quenched in water to form glasses with different basicities. The glasses were subsequently sintered in the temperature range of 600-1000℃ in air or nitrogen atmosphere for 1 h. The effects of different atmospheres on the physical and mechanical properties of sintered samples were studied by using differential scanning calorimetry （DSC）, X-ray diffraction （XRD） and scanning electron microscopy （SEM） and by conducting experiment on evaluating the sintering shrinkage, water absorption and bulk density. It is found that the kinetics of the sintering process is significantly affected by sintering atmosphere. In particular, compared with sintering in air atmosphere, sintering in N2 atmosphere promotes the synergistic growth of pyroxene and melilite crystalline phases, which can contribute to better mechanical properties and denser microstructure.