Fluidization characteristics of a U type reduction chamber 2019 Powder Techn

Suspension magnetization roasting technology is a new energy-saving technology in iron ore separation, and good results have been achieved in the treatment of complex and refractory iron ore resources. This work aims to innovate a U-type reduction chamber that functions as both a reduction chamber and a sealing valve to address the issues of uneven quality and poor discharge of reduced products. The study systematically investigates the influence of initial bed height and aeration velocity on the minimum fluidization velocity, utilizing various sizes of alumina powder particles. Experimental data were collected using the △P − Uf and бp − Uf methods, revealing that particle size and aeration velocity significantly affect the minimum fluidization velocity, while initial bed height has a minimal effect. Consistency between the two measurement methods validates their reliability. Furthermore, power spectrum analysis indicates that bubble formation, coalescence, and fragmentation contribute fundamentally to pressure fluctuation phenomena. The study also finds that as particle size decreases, the frequency of bubble coalescence and fragmentation increases, leading to a more dispersed bubble size distribution within the reduction chamber.