Change of Mineral Composition and Microstructure in Sinter During the Gas-Solid Reduction
ZHAO Xia1,LI Tie-jun1,PAN Wen2
1. Department of Architecture and Environmental Engineering, Shougang Institute of Technology, Beijing 100043, China 2. Department of Iron and Steel Research, Shougang Research Institute of Technology, Beijing 100043, China
Abstract：Characteristics of the gas-solid reduction reaction between sinter and CO gas were investigated with thermal-gravity analyzer. The study mainly focused on the mineral composition, microstructure and porosity during various stages of the reaction. It is found that the reduction rate decreases with higher reduction degree due to the mineral composition changes during the reduction. In the early stage of reduction, the reaction of hematite→magnetite, calcium ferrite→magnetite occurs, and the reduction rate of hematite is higher than that of calcium ferrite. At the reduction degree of 70%, all the hematite, calcium ferrite and magnetite were reduced to wustite. According to the analysis of microstructure and porosity, the porosity of the sample increases from 12.43% to 53.44% after reduction, and most of the increment happens in the early stage of the reduction. It was also found that the reduction is promoted in the area of fine porosity.
收稿日期: 2012-06-18
出版日期: 2013-02-27
引用本文:
赵霞，李铁军，潘文. 烧结矿气-固还原过程的矿物组成和显微结构变化[J]. 钢铁, 2013, 48(2): 18-22.
ZHAO Xia,LI Tie-jun,PAN Wen. Change of Mineral Composition and Microstructure in Sinter During the Gas-Solid Reduction. Iron and Steel, 2013, 48(2): 18-22.
2013, Vol. 48 
