Abstract: An apparatus and a method for separating a material stream consisting of several materials. The materials to be separated have different densities or density ranges, so that the material of the highest density can be discharged through a screen of the apparatus, while the material of the lowest density can be discharged via a first outlet located near the top of the liquid. Material of an intermediate density is discharged via a second outlet, located at a position above and near the screen. An extra liquid supply, directed in counter flow to the flow of the material stream to be separated, ensures the effective removal of material of the lowest density.

Abstract: The invention relates to a method of separating solid particles, using a magnetic fluid, wherein the magnetic fluid is passed through a magnetic field for the purpose of changing the effective density of the magnetic fluid, and the particles are separated into fractions of different density. The present invention further relates to device for separating solid particles, using a magnetic fluid.