Research on the Motion Characteristics of Fine Coal in Centrifugal Force Field

摘要

This paper described motion characteristics of fine coal in centrifugal force field, and introduced the working principle of the Falcon concentrator. By calculating the force and the settling final velocity of the fine particles in the centrifugal force field, it was obtained the relationship between the settling time of the fine particles and the centrifugal acceleration. The calculation result shows that the larger of centrifugal acceleration, density gap between the particle and the medium, diameter of fine particle, the shorter settling time of the particle. By calculating the tangential velocity of fine particle in the fluidization zone, it was found that the variation of the tangential velocity of the particles in the different flow film microlayers. The results show that the tangential velocity of each microlayer in the flow film gradually increased with the increase of the radius in the radial direction. At the end of the paper, taking -0.5mm fine coal of Wennan Coal Mine as an example, compared the actual effect of Falcon separator and flotation timed-release test on desulfurization and ash reduction, it was found that sulfur removal of fine coal in centrifugal force field was better than froth flotation.