散装铁精矿流态化宏细观机理

The Fluidized Macro Meso Mechanism of Iron Concentrate Ore in Bulk

摘要:

基于室内小型振动台对散装铁精矿进行动力试验，研究了散装铁精矿流态化发生的过程和机理.基于数字图像采集和分析系统，分析了流态化过程中铁精矿位移场、水分迁移以及颗粒运动规律，从宏细观两方面揭示了散装铁精矿的流态化演化规律.试验结果表明：铁精矿产生流态化的主要原因是在动力荷载作用下，铁精矿细颗粒沿着粗颗粒孔隙向下迁移和颗粒表面水下落汇集形成水膜后向上流动.该结论为进一步探究铁精矿的流态化预防措施提供了理论依据.

Abstract:

The experiments of shaking table tests were carried out in order to study the evolution and mechanism during the fluidization of iron concentrate ore in bulk. And with the use of digital image capture and processing technology, the laws concerning the displacement field, moisture migration and movement of particles during the fluidization were analyzed. As a result of these two types of experiments, both macro and meso mechanism of the fluidization of iron concentrate ore were revealed. The results show that it is the dynamic loading that leads to the fluidization of iron concentrate ore. Due to the dynamic loading, the fine particles move downward through the spaces between coarse particles. At the same time, the water on the surface of particle moves down and becomes water film which flows upwards. Meanwhile, it provides the theoretical basis for the further studies concerning preventive measures for the fluidization of iron concentrate ore.