Fine coal and three product dry beneficiation with vibration and double-density fluidized beds

The fluidizing performance and density uniform stability of vibration fluidized beds were analyzed. The experimental results in 2000 mm×80 mm×200 mm model apparatus show that the vibration fluidized bed can efficiently separate fine coal of size 6–0.5 mm, the beneficiation lower limit is 0.5 mm, the Ep value is 0.07. A double-density fluidized bed was formed by which the bed structure was specially designed with a pyramidal part. It can efficiently turn out three products according to densities in a fluidized cascade. The suitable range of gas flow rate is 4.4–4.6 m3/h. In the lighter area, the separation density is around 1.49 g/cm3, and Ep value is 0.06. In the denser area, the separation density is about 1.85 g/cm3, and Ep value is 0.07.