Dry separation of fine powder from coarse contaminant in a vibrating fluid bed

摘要

A method for separating coarse particles from TiO2 powder in a fine powder composition by the steps of: providing a system in which a source of the fine powder composition communicates with a minimally fluidizable bed of the fine powder composition within the system; delivering the fine powder composition from the source to the bed; imparting energy into the bed and delivering a fluidizing gas to the bed at a rate to cause the TiO2 powder and coarse particles of the fine powder composition to separate into a TiO2 powder phase and a coarse particle phase; removing the TiO2 powder from the system; and removing the coarse particles from the system.