【摘要】 以巴西铁矿粉为主要研究对象,采用单一变量方法,以金属化率和黏结比为评价指标,研究还原温度、线速度、还原时间及矿粉粒径等工艺因素对巴西铁矿粉流态还原的影响,确定铁矿粉还原的最佳方案。采用扫描电镜表征还原后铁矿粉的表面形貌,分析铁矿粉黏结机理。结果表明:常压下还原巴西铁矿粉的最佳操作参数为还原温度1 023 K、线速度0.6 m/s、还原时间50 min、矿粉颗粒粒径范围[0.15,0.18) mm;铁矿粉黏结的主要原因是生成的铁晶须相互勾连,导致颗粒团聚引起失流。更多还原

【Abstract】 Taking Brazilian iron ore powder as the main research object, the single variable method was used to study the influence of reduction temperature, linear velocity, reduction time and particle size on the flow reduction of Brazilian iron ore powder with metallization rate and bonding ratio as evaluation indexes, and the best reduction scheme of iron ore powder was determined. The surface morphology of reduced iron ore powder was characterized by scanning electron microscope to analyze the bonding mechanism of iron ore powder. The results show that the optimal operating parameters for reducing Brazilian iron ore powder are reduction temperature 1 023 K, linear velocity 0.6 m/s, reduction time 50 min, particle size range [0.15,0.18) mm. The main reason of iron ore powder bonding is that the generated iron whiskers are interlinked, which leads to particle agglomeration and loss of flow.更多还原