Separating solids from a mixture in a gas-solid fluidised bed

摘要

Particles from a mixture of solid particles of different types or categories having different physical properties are fluidised in a gas-solid fluidised bed within which at least one baffle (6) extends transversely by leading an upward gas flow through the bed at a selected velocity. The velocity of the gas flow is selected such that the separation of the single type or category of particles is obtained in one single axial segregation step in the fluidised bed. Separated particles are discharged via a discharge passage and can be collected without requiring further separating steps such as screening. The baffles can be maintained in a stationary state, and a mechanical stirring structure is not necessary for obtaining effective separation. A system for carrying out the method is also described.