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Recent studies have demonstrated the effectiveness of tribo-aero-electrostatic separation technologies,which consist in the selective sorting of mixed granular insulating materials in a fluidized bed affected by an electric field orthogonally oriented to the direction of the fluidization air.The aim of the present paper is to put the theoretical bases for the optimization of this process,i.e.maximize the total mass of the granules collected at the two electrodes that generate the electric field.The various forces that drive a granule of given mass and electric charge through the electric field and make it stick to an electrode are expressed as functions of the several input variables and parameters of the process,such as the applied high-voltage or the surface roughness,the size and the position of the electrodes.