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基于赤铁矿的综合利用,自行设计了流化床反应器,进行了各粒度级赤铁矿粉冷态流态化实验,实现了100~120、120~140、140~160、160~180、180~200目以及平均粒度为2μm的各粒度级矿粉颗粒的流态化过程.平均粒度为2μm的超细赤铁矿粉颗粒的流态化特征与100~200目粒度级矿粉颗粒的流态化特征不同,流化过程为:在低气速时,矿粉颗粒床层首先出现沟流;气速增加,沟流加剧,有时形成节涌;气速达到一个远超过理论初始流化速度的临界值(崩裂速度),床层突然分裂成许多小的聚团体,这些小的聚团体和细小颗粒呈现出较为均匀的流化状态.即随着气速的逐渐增大,流化状态经历了沟流、节涌、崩裂、聚团流化4个阶段.
Based on the comprehensive utilization of hematite, the fluidized bed reactor was designed by itself and the cold state fluidization experiments of hematite ore with various particle sizes were carried out. The experiments of 100-120,120-140,140-160,160-180 , 180 ~ 200 mesh and average particle size of 2μm.The results show that the fluidization characteristics of ultrafine hematite particles with an average particle size of 2μm are in agreement with the fluidization characteristics of 100 ~ 200 mesh particle size grade ore particles The fluidization process is as follows: At low gas velocities, the ditches first appear in the bed of ore particles; as the gas velocity increases, the ditches increase and sometimes the gullys are formed; and the gas velocity reaches a value that far exceeds the theoretical initial flow The critical value of the rate of crystallization (rate of cracking), the bed suddenly breaks down into many smaller clusters, which show a more uniform fluidization state, ie, as the gas velocity increases, the fluidization The state experienced a ditch, section Chung, cracked, agglomeration fluidized four stages.