|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||9th International Symposium on High Temperature Metallurgical Processing
||D-29: Growth of Metallic Iron Particles during Reductive Roasting of Boron-bearing Magnetite Concentrates: Characterization and Kinetics
||Xin Zhang, Guanghui Li, Mingjun Rao, Zhiwei Peng, Tao Jiang
|On-Site Speaker (Planned)
The particle size of metallic iron is essential to the grinding liberation and magnetic separation of metallic iron particles from the non-magnetic part, when the boron-bearing magnetite concentrate was subjected to reductive roasting followed by magnetic separation to achieve the separation of iron and boron. In this paper, the sizes of metallic iron particles of the reduced pellets were quantitatively measured by optical image analysis. Combined with the growing kinetics investigation, the relationship of the average size of metallic iron particles against reduction temperature and reaction time was correlated. The average size of metallic iron particle increased from7.33μm to13.63μm with the increasing reduction temperature from1000 °C to 1200 °C in the pellets reduced for 90min in a 100 vol.% CO atmosphere. Raising reduction temperature and prolonging reaction time were beneficial for the growth of metallic iron particle. The activation energy of the metallic iron particles growth was determined as 170kJ/mol.