Fine coal beneficiation with the application of a pulsing air dense medium fluidized bed

Abstract

Coal is one of the most important energy in the world. However, without separation, the coal would cause serious environmental pollution while in utilization and combustion. Because of the increasing shortage of water resource, research on high effective dry coal beneficiation technology becomes increasingly important. In this study, pulsing air flow with periodical velocity is introduced to air dense medium fluidized bed (ADMFB) to separate fine coal and the separation effect of the velocity and pulsation frequency of air flow are discussed. The results show that within the appropriate fluidization number range[1.1,1.3] of PADMFB, with the increase of pulsation frequency, under the condition of different air flow velocity and feed particle size, the standard deviation of ash segregation first increases and then decreases. N = 1.2, f =4Hz is proved to be the optimal operating condition. -6+3mm fine coal is separated effectively in pulsing air dense medium fluidized bed (PADMFB). The clean coal ash content and yield are respectively 15.03% and 64.07%.