Study on key factors affecting separation of fine coal vibrated fluidized bed

Based on the separation characteristics of a vibration fluidized bed,any medium was not used by drying cleaning of fine coal (1-3 mm)in a ϕ200 mm×400 mm vibration fluidized bed in this study. This paper elaborated the separation procedure and system structure of the vibrated fluidized bed. With three different bed heights,the study adopted the experimental installations of Design-Expert and investigated the influence of amplitude,vibration frequen- cy,expansion ratio and multi-factor synergy on separation performance to reveal the inherent law between all factors and the evaluation indicators. According to the experimental results,the gangue of high ash can be removed by a vibra- ted fluidized bed and obtain clean coal whose ash content reaches 10. 77% and reduces by about 23. 80% compared with 34. 57% ash with raw coal and gangue ash reaches more than 54. 00% ,which can effectively separate fine coal meeting the demand of the ash reduction and quality improvement.