THE REMOVAL OF RESIDUUM FROM LOW-RANK COAL PARTICLES AFTER USE OF HOTRESIDUUM TO ELIMINATE MOISTURE

One recently considered concept of beneficiation of low rank coal is e limination of moisture by immersion of the coal in hot heavy oil. The problem of the subsequent drainage of oil from the coal particles is c ited as a major difficulty of this process. In the present paper a the oretical analysis of drainage hydrodynamics has been carried out to in dicate the practical possibility for application of combined centrifug al, aerodynamic and gravitational forces to drain effectively excess o il from the surface of coal particles. Experiments on aerodynamic and gravitational drainage have confirmed the appearance of acceptable eff iciency of drainage predicted by theoretical calculations.