中南大学学报（自然科学版）2018，Vol.49Issue(4)：779-785,7.DOI:10.11817/j.issn.1672-7207.2018.04.002
鲕状赤铁矿深度还原过程中铁颗粒粒度和形貌特征分析
Characteristic analysis of iron particle size and microtopography of oolitic hematite in coal-based reduction process
摘要
Abstract
To study the characteristics of particle size and microtopography of oolitic hematite and pulverized coal in coal-based reduction, the process of coal-based reduction was simulated by squeezing block of oolitic hematite and coal. Average grain size, particle size distribution and microtopography of produced iron particles reduced at various temperatures and time were investigated via scanning electron microscope(SEM) and BGRIMM Process Mineralogy Analyzer (BPMA). The results show that grain size of metallic iron obviously increases with the increase of the reduction temperature and time, and reduction temperature has greater impact on iron grain growth. The number of iron particles in the first 20% particle size range accounts for 60%?85% in the total number of iron particles under different conditions. The growing process of iron particle is mainly as follows. Firstly, single spherical iron grain is separated out and coarsened; secondly, accumulational iron particles groups are formed by linking particles and then these groups are gradually fused and homogenized; stable and large iron particles are generated in the end.关键词
球团/铁颗粒/粒度/形貌Key words
briquette/iron particle/particle size/microtopography分类
矿业与冶金引用本文复制引用
栗艳锋,韩跃新,孙永升,高鹏,宫贵臣..鲕状赤铁矿深度还原过程中铁颗粒粒度和形貌特征分析[J].中南大学学报（自然科学版）,2018,49(4):779-785,7.基金项目
国家自然科学基金资助项目(51134002)(Project(51134002) supported by the National Natural Foundation of China) （51134002）
