中文摘要：

利用可视流化床分别研究了Fe2O3和Fe粉在流化过程中黏结失流发生的过程.结果表明,Fe2O3在惰性气氛中流化不发生黏结失流,而在还原气氛中发生黏结失流,且黏结发生时间恰好是铁晶核析出的初始阶段.Fe颗粒在还原和惰性气氛中流化均出现黏结失流现象.铁的生成是产生黏结的前提条件.当Fe颗粒流化温度从700℃升高到750℃时,黏结临界时间提前了11min,表明金属铁的表面特性是导致黏结的主要内因.扫描电镜分析表明,Fe和Fe2O3表面形成的纳微结构是导致Fe2O3流化还原黏结失流的重要因素.

英文摘要：

The process of sticking of Fe2O3 and iron particles during fluidization was investigated with a visual fluidized bed reactor.The results showed that Fe2O3 would defluidize in reduction gases but not in inert gases,and the sticking point happened around the initial stage of iron nucleation.The sticking of iron particles was observed in both reduction and inert gases.It is indicated that the premise of sticking was the formation of iron.When the fluidization temperature increased from 700 ℃ to 750 ℃,the critical point of sticking occurred 11 min in advance.It is the temperature-determined surface property of metallic iron that leads to the sticking.Scanning electron microscope（SEM） analysis proved that the sticking of Fe2O3 in fluidized bed reduction resulted mainly from iron surfaces with nano/micro structures.