the invention relates to a method and device for separating a mixture , made of particles of a first particle type and a second particle type , especially aleurone particles and shell particles made of comminuted bran , said particles being scarcely distinguishable in terms of size and density , into various types of particles . separation occurs according to particle - type specific triboelectric charging of said particles in a first active area and subsequent separation of the differently charged moving particles in an electric field .