论文摘要
To understand the formation and growth mechanism of the magnetite phase during the fluidized reduction of hematite, a high-purity hematite ore was isothermally reduced using a 20 vol% CO-80 vol% CO2 gas mixture in a micro-fluidized bed to examine the process of the selective conversion of hematite to magnetite. The micro-structural characteristics of the magnetite phase were investigated using scanning electron microscopy（SEM） and the Brunauer, Emmett, and Teller（BET） method, and the thickness of the magnetite layer was measured and evaluated using statistical analysis. The experimental results showed that the fresh magnetite nuclei were dense needles of different lengths, and the original hematite grains became porous after complete reduction to the magnetite phase. The thickness of the magnetite layer increased with an increase in reduction temperature and reduction time. The growth kinetics of the magnetite layer was investigated, and the value of the activation energy E was estimated to be 28.33 kJ/mol.
论文目录
文章来源
类型: 期刊论文
作者: Jian-wen Yu,Yue-xin Han,Yan-jun Li,Peng Gao
来源: International Journal of Minerals Metallurgy and Materials 2019年10期
年度: 2019
分类: 工程科技Ⅰ辑
专业: 冶金工业
单位: School of Resources and Civil Engineering, Northeastern University,State Key Laboratory of Mineral Processing, Beijing General Research Institute of Mining & Metallurgy Group
基金: financially supported by the National Science Foundation of China (Nos. 51734005 and 51674065),the China Postdoctoral Science Foundation (No. 2018M631812),Open Foundation of State Key Laboratory of Mineral Processing,Beijing General Research Institute of Mining & Metallurgy Group,China (No. BGRIMM-KJSKL-2019-09)
分类号: TF702.1
页码: 1231-1238
总页数: 8
文件大小: 1293K
下载量: 6