机械搅拌下高铁赤泥熔融还原物料卷吸与分散行为

Entrainment and dispersing behavior of high-iron red mud smelting reduction material under mechanical stirring

高铁赤泥经高温熔融还原后获得熔融铁水和还原渣,二者可分别作炼钢和水泥原料,实现赤泥资源化利用.针对如何突破高铁赤泥熔融还原过程中物料高效卷吸和分散的问题,利用高速摄像机和粒子图像测速仪等分析技术,研究了机械搅拌下搅拌桨类型、离底距离、偏心距、搅拌桨直径、搅拌转速对高铁赤泥熔融还原过程中流体流动状态和物料的卷吸及分散效果的影响.结果表明:VB十字桨卷吸效果较好,其卷料效果与搅拌转速呈正相关;适当增大搅拌桨直径和桨叶离底距离能增强物料卷吸效果;适当增加偏心距能改善物料的分散效果.

High-iron red mud can be used to obtain molten iron and reduced slag after high-temperature melting,which can be applied as raw materials for steelmaking and cement,to achieve resource utilization.Aiming at how to break through the problem of highly efficient entrainment and dispersion of materials in the smelting reduction process of high-iron red mud,the high-speed camera and particle image velocimeter with other analysis techniques have been utilized to study the effects of different stirring paddle types,impeller off-bottom clearance,eccentric distance,blade diameter,stirring speed on fluid flow state and material distribution behavior in smelting reduction of high-speed red mud process.The results show that the VB stirring paddle is better for entrainment,which is positively correlated with the stirring speed.Material entrainment can be enhanced by increasing the diameter of the agitator and the distance from the bottom.Properly increasing the eccentricity improves the dispersion effect of the material.