北京科技大学学报2011，Vol.33Issue(9)：1048-1052,5.
低品位铁矿石直接还原过程铁颗粒生长和解离特性
Grain growth and cleavage characteristics of metallic phase in direct reduction of a low-grade iron ore
孙体昌 1秦晓萌 1胡学平 1蒋曼 1王珍 1程帅1
作者信息
- 1. 北京科技大学金属矿山高效开采与安全教育部重点实验室,北京100083
- 折叠
摘要
Abstract
The grain growth and cleavage characteristics of metallic phase were studied in direct reduction of a low-grade iron ore. The effects of reducing agent dosage and roasting time on the grain growth were discussed. The results of X-ray diffraction and scanning electron microscopy show that decreasing the reducing agent dosage can limit the reducing atmosphere and restrict the generation of crystallization centers, thereby it is conducive to the grain growth of metallic phase, but the further grain growth is confined due to the partly losing of iron in gangue. Prolonging the roasting time can promote the grain agglomeration and growth, which can decrease the activity of metallic products and thus prohibit the reoxidation reaction. The generation of amorphous substances and the hardness differ- ence between metallic phase and gangue are beneficial to the cleavage of metallic iron when the grinding fineness is coarse.关键词
铁矿石/直接还原/颗粒生长/解离Key words
iron ores/direct reduction process/grain growth/cleavage分类
矿山工程引用本文复制引用
孙体昌,秦晓萌,胡学平,蒋曼,王珍,程帅..低品位铁矿石直接还原过程铁颗粒生长和解离特性[J].北京科技大学学报,2011,33(9):1048-1052,5.
