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In order to investigate the application of dilute fluidized bed in desulfuration and ash reduction to the classifier's recirculating loads in the power plant pulverizer, and how fine coal can influence the separation process in the fluidized bed, the size and density distribution of the pulverizer recirculating loads were analyzed to divide the materials into 0. 500-0. 125 mm and <0. 500 ram groups. Then the separation experiment was performed on the fluidized bed. The results show that the minimum fluidization velocity of both these groups is 0.41 cm/s. At the same time, minerals, including pyrite, are effectively removed. The ash content of light and heavy products in the two groups are found to be 38. 90% and 77. 58% for 0. 500-0. 125 mm, and 44. 64% and 74. 55% for <0. 500 mm. The sulfur content are 1.09%, 6.97% and 1. 62%, 6. 99% respectively, and the combustible material recovery rates are at 94. 11% and 91. 16% respectively. The results also show that the <0. 500 mm group has a more continuous and stable fluidized bed. The back scatter imagery of SEM and the energy spectrum test show the effectiveness of the separation. [ABSTRACT FROM AUTHOR]